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Xian-yong Wei - One of the best experts on this subject based on the ideXlab platform.
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insights into the structural characteristics of four thermal dissolution extracts of a Subbituminous Coal by using higher energy collisional dissociation
2020Co-Authors: Xing Fan, Xueming Dong, Chufan Wang, Hongcun Bai, P N Kuznetsov, Peng Liang, Zhenxue Liu, Xian-yong WeiAbstract:Abstract In Coal chemistry, thermal dissolution (TD) is an effective processing technique to obtain soluble components from Coal by using organic solvents under a certain pressure and temperature. Exploring molecular structures of the TD extracts of low-rank Coal is of great importance for eco-friendly and value-added utilization in chemical industry. To well elucidate the structural information of components in Coal, higher-energy collisional dissociation (HCD) specific to Orbitrap mass spectrometry was applied to analyze four TD extracts of a Subbituminous Coal. Alkyl chains of aromatic compounds can be removed from aromatic cores during a HCD process, allowing determination of the distribution of heteroatoms in either aromatic cores or alkyl chains. Both double bond equivalent value and carbon number of precursor ions (whole molecules) and the corresponding fragment ions (aromatic cores) obtained via a HCD process were used to evaluate the relationship between aromatic cores and alkyl chains for compounds in Coal. With the increase of molecular weight, compounds in Coal exhibited different distributions for aromatic cores and alkyl chains. From 200 Da to 300 Da, the increase of carbon number mainly contributed to the formation of condensed aromatic cores. However, from 300 Da to 400 Da, it was attributed to the formation of both aromatic cores and alkyl chains. In addition, heteroatom distribution index indicated that a higher TD yield of heteroatom-containing compounds would be obtained via solvents with a smaller molecular size and nitrogen-containing aromatics would be enriched by using TD solvents containing aromatic ring.
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Investigation on the Structural Features of Hanglaiwan Subbituminous Coal and Its Residues from Solvent Extraction and Thermal Dissolution
2020Co-Authors: Gao Yong, Xian-yong Wei, Guang-hui Liu, Yu-hong Kang, Ma Xiangrong, Ma Yajun, Long Yan, Jin-jun BaiAbstract:Hanglaiwan Subbituminous Coal (HSBC) was subjected to solvent extraction (SE) with an isometric carbon disulfide/acetone mixed solvent (IMCDSAMS) to obtain a residue (RSE). Thermal dissolution (TD)...
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evaluation of detailed molecular structures for sequential thermal dissolution extracts of a Subbituminous Coal using a tandem mass spectrometric method
2020Co-Authors: Xueming Dong, Xian-yong Wei, Xing Fan, Mei ZhongAbstract:Abstract Comprehensive and in-depth understanding of the molecular structure of low-rank Coals is the basis for clean and efficient utilization. The detailed molecular structure of sequential thermal dissolution (TD) extracts from a Subbituminous Coal was characterized using a high-resolution mass spectrometry run in a tandem MS method, in-source collision-activated dissociation. Cyclohexane and toluene TD extracts released compounds with less oxygen and more nitrogen atoms located on aromatic cores compared to ethanol and isopropanol TD extracts. Archipelago-structured compounds presented in asphaltenes were also observed in compounds from toluene TD extract. Principle component analysis, a multivariate statistical method, was introduced to mine molecular characteristics of the TD extracts. TD yield and relative abundance of CH class (without heteroatom) became the key point to determine the clustering pattern for whole molecules and aromatic cores, respectively.
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catalytic hydroconversion of soluble portion in the extraction from hecaogou Subbituminous Coal to clean liquid fuel over a y zsm 5 composite zeolite supported nickel catalyst
2020Co-Authors: Yu-hong Kang, Xian-yong Wei, Guang-hui Liu, Yong Gao, Zhifang Zhang, Zhi-min ZongAbstract:Abstract A novel and highly active Y/ZSM-5 composite zeolite (YZCZ)-supported nickel bifunctional catalyst (Ni/YZCZ) was prepared using a modified deposition–precipitation method to uniformly disperse Ni nanoparticles (NNPs) onto YZCZ. Hecaogou Subbituminous Coal was exhaustively extracted with isometric carbon disulfide and acetone mixed solvent under ultrasonic irradiation to afford the extractable portion (EP) in the yield of 18.4%. EP was subjected to catalytic hydroconversion (CHC) in n-hexane over Ni/YZCZ under 5 MPa of initial hydrogen pressure at 160 °C for 24 h to afford catalytically hydroconverted EP (CHCEP). Both EP and CHCEP were analyzed with a gas chromatograph/mass spectrometer (GC/MS) and quadrupole exactive orbitrap mass spectrometer (QPEOTMS). As a result, cyclanes, alkenes, and hydroarenes were only detected in CHCEP and the relative content (RC) of alkanes in CHCEP is much higher than that in EP, while the RCs of both arenes, especially condensed arenes, and oxygen-containing organic compounds in EP are predominantly higher than those in CHCEP and nitrogen-containing organic compounds were only detected in EP. According to the CHC of Coal-related model compound oxydibenzene (ODB), Ni/YZCZ can effectively activate H2 to biatomic active hydrogen (H⋯H), which is then split to an immobile H− attached on Ni/YZCZ and a relatively mobile H+. The H⋯H transfer leads to the hydrogenation of aromatic rings (ARs) in EP and ODB followed by heteroatom removal from the hydrogenated EP and ODB. In addition, due to the appropriate acidity, uniformly dispersed NNPs, and mesoporous structure of YZCZ, Ni/YZCZ proved to be still active for the CHC after 3 cycles and recoverable.
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enhanced hydrogenation of aromatic rings and hydrocracking of caro bridged bonds in the extraction residue from piliqing Subbituminous Coal over a magnetic difunctional solid superbase
2020Co-Authors: Xian-yong Wei, Guang-hui Liu, Zhi-min Zong, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Wei Zhao, Min Zhang, Jingmei LiuAbstract:Abstract Ni-Mg2Si/attapulgite powder (AP) was prepared by thermally decomposing nickel tetracarbonyl onto the as-synthesized Mg2Si/AP by impregnating Mg2Si onto AP in CCl4. Its catalytic performance was evaluated by the catalytic hydroconversion (CHC) of oxydibenzene (ODB) in n-hexane under different reaction conditions. Both ODB conversion and cyclohexane selectivity are 100 % by the CHC of ODB over Ni-Mg2Si/AP under 3 MPa of initial hydrogen pressure at 240 °C for 4 h. However, almost no ODB was converted without Ni-Mg2Si/AP under the same conditions. The results show that Ni-Mg2Si/AP could activate H2 to biatomic active hydrogen (H⋯H) and H−, resulting in the hydrogenation of aromatic rings (ARs) and the hydrocracking of >Car O bridged bonds (COBBs), respectively. Additionally, the catalyst was also successfully applied in the CHC of extraction residue (ER) from Piliqing Subbituminous Coal (PSBC) in n-hexane. The group components of the soluble portion (SP) from CHC and non-CHC (NCHC) (SPCHC and SPNCHC) of ER were analyzed with a gas chromatograph/mass spectrometer. The yield (36.4 %) of SPCHC is significantly higher than that (1.8 %) of SPNCHC. More alkyl-substituted arenols (ASAs), anisoles, and methoxy-substitued cresols exist in SPNCHC, while SPCHC contains more normal alkanes (NAs), non-substituted cycloalkanes, alkylcyclohexanes, tetralins, and octahydroanthracenes. NAs are predominant in SPCHC, while ASAs are the most abundant in SPNCHC, indicating that the CHC facilitates the hydrocracking COBBs and hydrogenating ARs. ODB conversion is as high as 91.2 % after recycling 4 times. Therefore, the catalyst might be potential to produce Coal-derived chemicals and clean liquid fuels to facilitate Coal efficient conversions owing to its high activity, difunctionality, stability, and good recyclability.
Zhi-min Zong - One of the best experts on this subject based on the ideXlab platform.
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catalytic hydroconversion of soluble portion in the extraction from hecaogou Subbituminous Coal to clean liquid fuel over a y zsm 5 composite zeolite supported nickel catalyst
2020Co-Authors: Yu-hong Kang, Xian-yong Wei, Guang-hui Liu, Yong Gao, Zhifang Zhang, Zhi-min ZongAbstract:Abstract A novel and highly active Y/ZSM-5 composite zeolite (YZCZ)-supported nickel bifunctional catalyst (Ni/YZCZ) was prepared using a modified deposition–precipitation method to uniformly disperse Ni nanoparticles (NNPs) onto YZCZ. Hecaogou Subbituminous Coal was exhaustively extracted with isometric carbon disulfide and acetone mixed solvent under ultrasonic irradiation to afford the extractable portion (EP) in the yield of 18.4%. EP was subjected to catalytic hydroconversion (CHC) in n-hexane over Ni/YZCZ under 5 MPa of initial hydrogen pressure at 160 °C for 24 h to afford catalytically hydroconverted EP (CHCEP). Both EP and CHCEP were analyzed with a gas chromatograph/mass spectrometer (GC/MS) and quadrupole exactive orbitrap mass spectrometer (QPEOTMS). As a result, cyclanes, alkenes, and hydroarenes were only detected in CHCEP and the relative content (RC) of alkanes in CHCEP is much higher than that in EP, while the RCs of both arenes, especially condensed arenes, and oxygen-containing organic compounds in EP are predominantly higher than those in CHCEP and nitrogen-containing organic compounds were only detected in EP. According to the CHC of Coal-related model compound oxydibenzene (ODB), Ni/YZCZ can effectively activate H2 to biatomic active hydrogen (H⋯H), which is then split to an immobile H− attached on Ni/YZCZ and a relatively mobile H+. The H⋯H transfer leads to the hydrogenation of aromatic rings (ARs) in EP and ODB followed by heteroatom removal from the hydrogenated EP and ODB. In addition, due to the appropriate acidity, uniformly dispersed NNPs, and mesoporous structure of YZCZ, Ni/YZCZ proved to be still active for the CHC after 3 cycles and recoverable.
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enhanced hydrogenation of aromatic rings and hydrocracking of caro bridged bonds in the extraction residue from piliqing Subbituminous Coal over a magnetic difunctional solid superbase
2020Co-Authors: Xian-yong Wei, Guang-hui Liu, Zhi-min Zong, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Wei Zhao, Min Zhang, Jingmei LiuAbstract:Abstract Ni-Mg2Si/attapulgite powder (AP) was prepared by thermally decomposing nickel tetracarbonyl onto the as-synthesized Mg2Si/AP by impregnating Mg2Si onto AP in CCl4. Its catalytic performance was evaluated by the catalytic hydroconversion (CHC) of oxydibenzene (ODB) in n-hexane under different reaction conditions. Both ODB conversion and cyclohexane selectivity are 100 % by the CHC of ODB over Ni-Mg2Si/AP under 3 MPa of initial hydrogen pressure at 240 °C for 4 h. However, almost no ODB was converted without Ni-Mg2Si/AP under the same conditions. The results show that Ni-Mg2Si/AP could activate H2 to biatomic active hydrogen (H⋯H) and H−, resulting in the hydrogenation of aromatic rings (ARs) and the hydrocracking of >Car O bridged bonds (COBBs), respectively. Additionally, the catalyst was also successfully applied in the CHC of extraction residue (ER) from Piliqing Subbituminous Coal (PSBC) in n-hexane. The group components of the soluble portion (SP) from CHC and non-CHC (NCHC) (SPCHC and SPNCHC) of ER were analyzed with a gas chromatograph/mass spectrometer. The yield (36.4 %) of SPCHC is significantly higher than that (1.8 %) of SPNCHC. More alkyl-substituted arenols (ASAs), anisoles, and methoxy-substitued cresols exist in SPNCHC, while SPCHC contains more normal alkanes (NAs), non-substituted cycloalkanes, alkylcyclohexanes, tetralins, and octahydroanthracenes. NAs are predominant in SPCHC, while ASAs are the most abundant in SPNCHC, indicating that the CHC facilitates the hydrocracking COBBs and hydrogenating ARs. ODB conversion is as high as 91.2 % after recycling 4 times. Therefore, the catalyst might be potential to produce Coal-derived chemicals and clean liquid fuels to facilitate Coal efficient conversions owing to its high activity, difunctionality, stability, and good recyclability.
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structural features of liquefaction residue from shenmu fugu Subbituminous Coal
2019Co-Authors: Zhi-min Zong, Xian-yong Wei, Yugao Wang, Guixia FanAbstract:Abstract Liquefaction residue (LRSFSBC) from Shenmu-Fugu Subbituminous Coal was ultrasonically extracted with petroleum ether, methanol, cyclohexane, ethyl acetate, acetone, carbon disulfide (CDS) and isometric CDS/acetone mixture (IMCDSAM), respectively. A number of alkanes, arenes, arenols, alkanols, alkenones, esters, and nitrogen-containing organic compounds were identified according to the analyses with Fourier transform infrared spectrometer, gas chromatograph/mass spectrometer, direct analysis in real-time ionization source coupled with ion trap mass spectrometer, and solid-state 13C nuclear magnetic resonance (SS 13C NMR). The tetra- and penta-substituted anthracene or phenanthrene unit could be the average structures in LRSFSBC by SS 13C NMR analysis. The main intermolecular interactions among the organic species in LRSFSBC are π–hydrogen bonds and π–π interactions. These interactions are also the cause for “capsule” formation. Stronger interactions between LRSFSBC and solvents, especially CDS and IMCDSAM, destroyed the interactions and thereby led to high extract yields.
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mofs derived n doped carbon matrix superacid catalyzed hydrocracking of a residue from thermal dissolution of hefeng Subbituminous Coal
2018Co-Authors: Zheng Yang, Xian-yong Wei, Zhi-min Zong, Min Zhang, Zhehao WeiAbstract:Abstract An active, low-cost, and recyclable catalyst was prepared by impregnating trifluoromethanesulfonic acid (TFMSA) onto metal-organic frameworks (MOFs)-derived N-doped carbon matrix nanoparticles. The residue (RTD) from thermal dissolution (TD) of Hefeng Subbituminous Coal in methanol was subjected to further TD and catalytic hydrocracking (CHC) over the catalyst, i.e., TFMSA/MOFs at 300 °C in cyclohexane. Detailed molecular compositions of the soluble portions from TD (SPTD) and CHC (SPCHC) were characterized with a Fourier transform infrared spectrometer, gas chromatograph/mass spectrometer (GC/MS), and positive-ion atmospheric pressure chemical ionization orbitrap mass spectrometer (PIAPCIORMS). The results show that 15.60% of organic matter in RTD was converted to a soluble portion by the CHC, whereas the yield of SPTD is only 1.04%. According to the analysis with GC/MS, SPCHC is rich in alkyl-substituted benzenes, while most of the GC/MS-detectable compounds in SPTD are alkyl-substituted arenols, alkyl-substituted cyclenones, and phenylalkanones in addition to alkyl-substituted benzenes. The analysis with PIAPCIORMS shows that both the number and yields of basic nitrogen-containing species were dramatically reduced after the CHC. These facts indicate that TFMSA/MOFs effectively catalyzed the cleavage of Car–Calk bridged bonds connecting some aromatic rings (ARs) and side chains on some ARs in RTD to obtain soluble compounds. Di(1-naphthyl)methane and 2-(benzyloxy)naphthalene were used as Coal-related model compounds (CRMCs) and their CHCs were investigated to further explore the catalysis of TFMSA/MOFs in the CHC of RTD. As a result, TFMSA/MOFs effectively catalyzed the cleavage of Car-Calk and C-O bonds in the CRMCs under moderate conditions. TFMSA/MOFs can be easily separated by using an external magnetic field and the recovered TFMSA/MOFs is still highly active for the CHC of DNM.
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enhanced hydrocracking car calk bridged bonds in the extraction residue from piliqing Subbituminous Coal over a recyclable and active magnetic solid superacid
2018Co-Authors: Zheng Yang, Xian-yong Wei, Yanan Wang, Min Zhang, Daoguang Teng, Zhongqiu Liu, Zhi-min ZongAbstract:Abstract A novel and highly active magnetic solid superacid (MSSA) with extraordinary separable and recyclable properties was facilely developed by impregnating trifluoromethanesulfonic acid onto mesoporous zirconia coated ferroferric oxide nanoparticles. The extraction residue (ER) from Piliqing Subbituminous Coal was subjected to non-catalytic hydrocracking (NCHC) and catalytic hydrocracking (CHC) in cyclohexane over MSSA at 300 °C. Detailed molecular compositions of the soluble portions from NCHC (SPNCHC) and CHC (SPCHC) were characterized with a Fourier transform infrared spectrometer and gas chromatograph/mass spectrometer (GC/MS). As a result, the yield of SPCHC is remarkably higher than that of SPNCHC and most of the GC/MS-detectable compounds in SPCHC are arenes, while SPNCHC contains alkanes, arenes, arenols, and ketones, indicating that MSSA effectively catalyzed the cleavage of Car-Calk bridged bonds connecting some aromatic rings (ARs) and side chains on some ARs in the ER. Di(1-naphthyl)methane (DNM) and 9-benzylphenanthrene (9-BP) were used as Coal-related model compounds (CRMCs) and their CHCs were investigated to further probe the catalysis of MSSA in the CHC of the ER. The result suggests that MSSA is highly active for cleaving the Car-Calk bond in the CRMCs and generating naphthalene and phenanthrene under mild conditions. Based on the exploration of controlling reactions, the catalytic mechanism was discussed. MSSA could be easily separated and still active for the CHC of DNM after 3-times recycle.
Fang-jing Liu - One of the best experts on this subject based on the ideXlab platform.
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evaluation of humic acids produced from pakistani Subbituminous Coal by chemical and fungal treatments
2020Co-Authors: Muhammad Adnan Sabar, Fang-jing Liu, Muhammad Ishtiaq Ali, Noureen Fatima, Aneela Younas Malik, Asif Jamal, Rabia Liaquat, Hongguang Guo, Michael A Urynowicz, Zaixing HuangAbstract:Abstract The development of bio-processing low rank Coal into fuels and non-fuel products has received growing interest in recent years, e.g., production of alternative chemical stock (i.e., humic acids) by the fungal transformation. Previous studies have demonstrated that fungal strains isolated from Coal environments can play an important role in the Coal-transformation processes with in vivo optimization and chemical pretreatments. In this study, the influence of chemical pretreatments (nitric acid and hydrogen peroxide) with a fungal isolate from Coal on the depolymerization of Pakistani Subbituminous Coal was conducted. The chemical pretreatment exhibited enhanced production of humic acid from 13.5% to 54.2% for nitric acid and 45.7% for hydrogen peroxide. Nitric acid was more effective pretreatment in individual and combination with fungal-mediated depolymerization than hydrogen peroxide. The production of fungal-transformed liquid-derived humic acids were 36.4% and 31.1% for nitric acid and hydrogen peroxide pretreated Coal. The results showed that the fungal-transformed humic acid has a high molecular weight, elevated aromatic condensation with mono and poly-substituted functional groups than the chemically treated and raw Coal-derived humic acids. The fungal treatment also increased the nitrogen content in the resultant extract, which can be beneficial to the functionality of humic acids. By combining chemical and fungal treatment, it is possible to improve the quantity and quality of humic acids extracted from low rank Coal. This is a promising approach in the development of more sustainable-cleaner products from Pakistan’s Coal resources for the production of bio-active humic acid.
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enhanced hydrogenation of aromatic rings and hydrocracking of caro bridged bonds in the extraction residue from piliqing Subbituminous Coal over a magnetic difunctional solid superbase
2020Co-Authors: Xian-yong Wei, Guang-hui Liu, Zhi-min Zong, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Wei Zhao, Min Zhang, Jingmei LiuAbstract:Abstract Ni-Mg2Si/attapulgite powder (AP) was prepared by thermally decomposing nickel tetracarbonyl onto the as-synthesized Mg2Si/AP by impregnating Mg2Si onto AP in CCl4. Its catalytic performance was evaluated by the catalytic hydroconversion (CHC) of oxydibenzene (ODB) in n-hexane under different reaction conditions. Both ODB conversion and cyclohexane selectivity are 100 % by the CHC of ODB over Ni-Mg2Si/AP under 3 MPa of initial hydrogen pressure at 240 °C for 4 h. However, almost no ODB was converted without Ni-Mg2Si/AP under the same conditions. The results show that Ni-Mg2Si/AP could activate H2 to biatomic active hydrogen (H⋯H) and H−, resulting in the hydrogenation of aromatic rings (ARs) and the hydrocracking of >Car O bridged bonds (COBBs), respectively. Additionally, the catalyst was also successfully applied in the CHC of extraction residue (ER) from Piliqing Subbituminous Coal (PSBC) in n-hexane. The group components of the soluble portion (SP) from CHC and non-CHC (NCHC) (SPCHC and SPNCHC) of ER were analyzed with a gas chromatograph/mass spectrometer. The yield (36.4 %) of SPCHC is significantly higher than that (1.8 %) of SPNCHC. More alkyl-substituted arenols (ASAs), anisoles, and methoxy-substitued cresols exist in SPNCHC, while SPCHC contains more normal alkanes (NAs), non-substituted cycloalkanes, alkylcyclohexanes, tetralins, and octahydroanthracenes. NAs are predominant in SPCHC, while ASAs are the most abundant in SPNCHC, indicating that the CHC facilitates the hydrocracking COBBs and hydrogenating ARs. ODB conversion is as high as 91.2 % after recycling 4 times. Therefore, the catalyst might be potential to produce Coal-derived chemicals and clean liquid fuels to facilitate Coal efficient conversions owing to its high activity, difunctionality, stability, and good recyclability.
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characterization of organic compounds from hydrogen peroxide treated Subbituminous Coal and their composition changes during microbial methanogenesis
2019Co-Authors: Fang-jing Liu, Bo Chen, Hongguang Guo, Michael A Urynowicz, Qiurong Wang, Rizwan Haider, Paul H Fallgren, Song Jin, Mingchen Tang, Zaixing HuangAbstract:Abstract Natural gas burns cleaner than Coal by reducing ∼50% of the carbon footprint and emission of toxic substances and particulates. Coalbed natural gas can be produced from Coal by indigenous microorganisms. Hydrogen peroxide treatment to Coal has been shown to enhance the production of biogenic Coalbed natural gas. In this study, we investigated methane generation from a Subbituminous Coal pretreated by hydrogen peroxide and the changes of the organic composition during gas production. We demonstrate that there is a great potential to produce natural gas from hydrogen peroxide-treated Coal by microorganisms. The organic composition of the Coal-derived compounds and the bulk organic profiling were changed because of the microbial degradation. The liquid samples before and after gas production were characterized by fluorescence spectrometer, GC/MS, HPLC, GPC, and TOCs. The results indicated that the chemical treatment has produced both labile organic components and compounds that are recalcitrant to microbial degradation. Labile compounds including short-chain carboxylic acids (C1 to C6) were found to contribute to the gas production. HPSEC analysis has shown shifts of molecular weight distributions, confirming organic composition changes. In addition, the analyses suggested that the labile organic compounds were conducive to shorten the lag phase of the gas production, whereas the presumed-recalcitrant constituents were surprisingly slightly biodegraded. The analysis also showed that the chemical treatment and biotransformation could produce compounds that are toxic to the environment. Environmental impacts should be fully evaluated before field applications.
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enhanced production of secondary biogenic Coalbed natural gas from a Subbituminous Coal treated by hydrogen peroxide and its geochemical and microbiological analyses
2019Co-Authors: Qiurong Wang, Fang-jing Liu, Hongguang Guo, Michael A Urynowicz, Paul H Fallgren, Song Jin, Hongjie Wang, Hang Zheng, Raymond J Zeng, Bo ChenAbstract:Abstract Unmineable Coal accounts for over 90% of the world’s fossil fuel resources. Fortunately, many Coal seams contain indigenous microorganisms capable of utilizing the Coal as a carbon source to produce secondary biogenic Coalbed natural gas. However, Coal bioavailability has been shown to be a significant factor that limits the extent of bioconversion. In this study, we have analyzed the rate and yield of the biogas production and assessed the gas potential, carbon balance, stable carbon isotopes, microbial communities, and microbial pathways changes resulting from the hydrogen peroxide pretreatment with the Wyoming’s Powder River Basin Subbituminous Coal. The results showed that Coal pretreated with hydrogen peroxide can significantly enhance the bioavailability of Coal for enhancing the biogas production, with a peak yield of 552.6 μmol/g Coal (437.1 Scf/ton Coal) at the day 184. The stable carbon isotopic analysis indicated that the δ13C values of the methane and carbon dioxide were much less negative than the published field data. This suggested that the enrichment or depletion of the precursor 13C could contribute to the shift of the carbon isotopic composition in the subsequence processes. Therefore, the data should be used with cautions for interpreting genesis of the thermogenic/biogenic methane and the methanogenic pathways. The methanogenic pathways were also investigated with re-fed experiment and microbial community analysis. The results indicated that the hydrogenotrophic pathway was not active in the original inoculum became activated after the gas production. The microbial community analysis demonstrated that the obligate hydrogenotrophic methanobacterium was the most dominant methanogens in the microcosms after the gas production. This suggested that the chemical treatment of Coal has impacts on the microbial structure during the subsequent methane production phase.
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sequential extraction and characterization of liquefaction residue from shenmu fugu Subbituminous Coal
2015Co-Authors: Zhi-min Zong, Xian-yong Wei, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Yugao Wang, Wei ZhaoAbstract:Abstract Liquefaction residue from Shenmu–Fugu Subbituminous Coal (LR SFSBC ) was fractionated into extracts 1–6 (E 1 –E 6 ) and inextractable portion (IEP) by sequential extraction with petroleum ether, cyclohexane, methanol, acetone, carbon disulfide (CDS), and isometric CDS and acetone mixture (ICDSAM) followed by analyses with Fourier transform infrared (FTIR) spectrometer, gas chromatography/mass spectrometer (GC/MS) and atmospheric solid analysis probe/time of flight mass spectrometer (ASAP/TOF-MS). In total, 69.06% of LR SFSBC were extracted by the sequential extraction. Large amounts of multi-substituted alkylarenes and hydroarenes were identified in LR SFSBC according to GC/MS and FTIR analyses. A series of nitrogen heterocyclic aromatics and arylamines in LR SFSBC were enriched in E 3 . In total 61 compounds were detected with GC/MS, including 48 arenes with a total relative content of 98.72%, while 478 organooxygens, organonitrogens, organosulfurs, and organochlorines were detected with ASAP/TOF-MS. The double bond equivalent, carbon number, and molecular mass distribution of the compounds range from 0 to 13, 6 to 23, and 230 to 511 Da, respectively, by ASAP/TOF-MS analysis. E 1 with the yield of 33.47% could be converted to light oil by catalytic hydroconversion due to its high H/C ratio and low sulfur content, while E 5 could be a promising precursor for preparing carbon materials because of its high carbon content and C/H ratio.
Wei Zhao - One of the best experts on this subject based on the ideXlab platform.
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enhanced hydrogenation of aromatic rings and hydrocracking of caro bridged bonds in the extraction residue from piliqing Subbituminous Coal over a magnetic difunctional solid superbase
2020Co-Authors: Xian-yong Wei, Guang-hui Liu, Zhi-min Zong, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Wei Zhao, Min Zhang, Jingmei LiuAbstract:Abstract Ni-Mg2Si/attapulgite powder (AP) was prepared by thermally decomposing nickel tetracarbonyl onto the as-synthesized Mg2Si/AP by impregnating Mg2Si onto AP in CCl4. Its catalytic performance was evaluated by the catalytic hydroconversion (CHC) of oxydibenzene (ODB) in n-hexane under different reaction conditions. Both ODB conversion and cyclohexane selectivity are 100 % by the CHC of ODB over Ni-Mg2Si/AP under 3 MPa of initial hydrogen pressure at 240 °C for 4 h. However, almost no ODB was converted without Ni-Mg2Si/AP under the same conditions. The results show that Ni-Mg2Si/AP could activate H2 to biatomic active hydrogen (H⋯H) and H−, resulting in the hydrogenation of aromatic rings (ARs) and the hydrocracking of >Car O bridged bonds (COBBs), respectively. Additionally, the catalyst was also successfully applied in the CHC of extraction residue (ER) from Piliqing Subbituminous Coal (PSBC) in n-hexane. The group components of the soluble portion (SP) from CHC and non-CHC (NCHC) (SPCHC and SPNCHC) of ER were analyzed with a gas chromatograph/mass spectrometer. The yield (36.4 %) of SPCHC is significantly higher than that (1.8 %) of SPNCHC. More alkyl-substituted arenols (ASAs), anisoles, and methoxy-substitued cresols exist in SPNCHC, while SPCHC contains more normal alkanes (NAs), non-substituted cycloalkanes, alkylcyclohexanes, tetralins, and octahydroanthracenes. NAs are predominant in SPCHC, while ASAs are the most abundant in SPNCHC, indicating that the CHC facilitates the hydrocracking COBBs and hydrogenating ARs. ODB conversion is as high as 91.2 % after recycling 4 times. Therefore, the catalyst might be potential to produce Coal-derived chemicals and clean liquid fuels to facilitate Coal efficient conversions owing to its high activity, difunctionality, stability, and good recyclability.
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sequential extraction and characterization of liquefaction residue from shenmu fugu Subbituminous Coal
2015Co-Authors: Zhi-min Zong, Xian-yong Wei, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Yugao Wang, Wei ZhaoAbstract:Abstract Liquefaction residue from Shenmu–Fugu Subbituminous Coal (LR SFSBC ) was fractionated into extracts 1–6 (E 1 –E 6 ) and inextractable portion (IEP) by sequential extraction with petroleum ether, cyclohexane, methanol, acetone, carbon disulfide (CDS), and isometric CDS and acetone mixture (ICDSAM) followed by analyses with Fourier transform infrared (FTIR) spectrometer, gas chromatography/mass spectrometer (GC/MS) and atmospheric solid analysis probe/time of flight mass spectrometer (ASAP/TOF-MS). In total, 69.06% of LR SFSBC were extracted by the sequential extraction. Large amounts of multi-substituted alkylarenes and hydroarenes were identified in LR SFSBC according to GC/MS and FTIR analyses. A series of nitrogen heterocyclic aromatics and arylamines in LR SFSBC were enriched in E 3 . In total 61 compounds were detected with GC/MS, including 48 arenes with a total relative content of 98.72%, while 478 organooxygens, organonitrogens, organosulfurs, and organochlorines were detected with ASAP/TOF-MS. The double bond equivalent, carbon number, and molecular mass distribution of the compounds range from 0 to 13, 6 to 23, and 230 to 511 Da, respectively, by ASAP/TOF-MS analysis. E 1 with the yield of 33.47% could be converted to light oil by catalytic hydroconversion due to its high H/C ratio and low sulfur content, while E 5 could be a promising precursor for preparing carbon materials because of its high carbon content and C/H ratio.
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characterization of zhundong Subbituminous Coal by time of flight mass spectrometry equipped with atmospheric pressure photoionization ion source
2014Co-Authors: Aili Zheng, Xian-yong Wei, Zhi-min Zong, Yun-peng Zhao, Xing Fan, Fang-jing Liu, Shouze Wang, Wei ZhaoAbstract:article i nfo Zhundong Subbituminous Coal pretreated with aqueous H2O2 was oxidized by aqueous NaOCl and sequentially extracted with diethyl ether (DEE) and ethyl acetate (EA) to afford DEE- and EA-extractable fractions and res- idue. Both extracts were esterified with CH2N2 and analyzed using high performance liquid Chromatography/ mass spectrometry equipped with electrospray ionization (ESI) or atmospheric pressure photoionization (APPI) ion source. Molecular mass of 60% compounds in the esterified extracts ranged between 200 and 600 Da and more than 20% of the esterified extracts had molecular mass over 600 Da. Toluene and toluene/ anisole (vol./vol. = 95/5) were used as dopants for APPI. Low- and non-polar compounds in the esterified ex- tracts were well analyzed using APPI/MS. Compared to toluene/anisole mixture, toluene greatly increased ionization efficiency of APPI. More molecular associations were detected by ESI than by APPI. Heteroatoms were identified in most of the associated species.
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mechanism for removal of organic sulfur from guiding Subbituminous Coal by electrolysis
2011Co-Authors: Shiteng Zhong, Zhi-min Zong, Wei Zhao, Chen Sheng, Xian-yong WeiAbstract:Ash in Guiding Subbituminous Coal (GSBC) was removed by treatment with dilute acids. The treated GSBC (TGSBC) was extracted with isopropanol (IP) to afford IP-extractable fraction (IPEF). TGSBC was sequentially extracted with petroleum ether, carbon disulfide, acetone, and methanol. Octane-1-thiol and thiophene were selected as model compounds (MCs) for organic sulfurs in GSBC. MCs and extracted residue (ER) of TGSBC were electrolyzed in an aqueous NaCl solution. Reaction mixtures from the electrolysis of MCs were extracted with cyclohexane. The electrolyzed extracted residue (EER) was extracted with the same method as TGSBC. The extracts were analyzed with gas chromatography/mass spectrometry (GC/MS). ER and EER were analyzed with Fourier transform infrared (FTIR) spectrometry. Three organic sulfurs were detected in IPEF from TGSBC with GC/MS. FTIR analysis shows that ER electrolysis increased oxygen-containing functional groups but decreased organic sulfurs. Disulfide, sulfoxide, sulfone, and sulfonic a...
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oxidative depolymerization of shenfu Subbituminous Coal and its thermal dissolution insoluble fraction
2017Co-Authors: Hengfu Shui, Chunxiu Pan, Zhicai Wang, Zhiping Lei, Shigang Kang, Hualong Liu, Qian Liu, Xian-yong WeiAbstract:Abstract The oxidative depolymerizations of Shenfu Subbituminous Coal (SSBC) and its thermal dissolution insoluble (TDI), which obtained by thermal dissolution (TD) in 1-methylnaphthalene at 320 °C, were investigated with H 2 O 2 aqueous solution as oxidant under different conditions. Their products were characterized by FTIR, ultimate analyses and acidic functional groups determination. Further, the detailed comparison of oxidative depolymerizations of SSBC and its TDI was carried out with 20% H 2 O 2 at 60 °C. The water solubles (WSs) were esterified, and subsequently analyzed by GC/MS in order to understand the macromolecular structural features of SSBC. The results revealed that compared with SSBC, the TDI contained more phenolic hydroxyls and showed higher oxidation reactivity. It suggested that the phenolic hydroxyl should be the active site of oxidative depolymerization, and thermal dissolution generated substantial phenolic hydroxyls in TDI by the rupture of C al –OAr. The WS from the oxidation of SSBC mainly consists of monocyclic aromatic acids, while the WS from TDI contains much amount of alkanoic acids and α,ω-dicarboxylic acids. Especially the substantial oxalic acid and malonic acid identified in the WS from TDI suggested that significant amount of the aromatic rings in the macromolecules of SSBC could be coupled directly or connected by monomethylene bridge.
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co thermal dissolution of shenmu fugu Subbituminous Coal and sawdust
2015Co-Authors: Hengfu Shui, Zhen Hui, Qingqing Jiang, Hua Zhou, Chunxiu Pan, Zhicai Wang, Zhiping Lei, Shibiao Ren, Shigang KangAbstract:Abstract The co-thermal dissolution (CTD) behavior of Shenmu–Fugu Subbituminous Coal (SFSBC) and sawdust was investigated in this study. The synergic effect between SFSBC Coal and sawdust in CTD was probed. The individual thermal dissolution (TD) of SFSBC and sawdust showed that sawdust gave much higher thermal dissolution yield (TDY) and lower thermal soluble yield (TSY) than SFSBC. This resulted in much lower difference of (TDY–TSY) for SFSBC compared to that of sawdust at the same condition. CTDs of SFSBC and sawdust in 1-methylnaphthalene (1-MN) at different temperatures were carried out. The results suggested that there existed a negative synergic effect for TDY in the whole range of temperatures studied, but a positive synergic effect for TSY at 320 and 340 °C. The largest enhancements in TSY of 33.6% comparing with the corresponding calculated weighted mean values of the individual TD of SFSBC and sawdust were obtained at 320 °C. The positive synergic effect can be attributed to that the thermal depolymerization of lignin at relatively low temperatures produces lots of intermediates such as phenoxy radicals, which then attack the Coal, causing scission of aliphatic carbon–carbon bonds in the Coal and promoting the TD of Coal.
