The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Shurong Wang - One of the best experts on this subject based on the ideXlab platform.
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influence of a lewis acid and a bronsted acid on the conversion of microcrystalline cellulose into 5 hydroxymethylfurfural in a single phase Reaction System of water and 1 2 dimethoxyethane
RSC Advances, 2018Co-Authors: Yuan Zhao, Jingping Chen, Shurong Wang, Hao XuAbstract:5-Hydroxymethylfurfural (HMF) is a typical dehydration product of C6 carbohydrates, and it can be converted into a series of chemicals and liquid fuels. In this study, an advanced low-boiling single-phase Reaction System consisting of water and 1,2-dimethoxyethane (DMOE) was proposed for the production of HMF from microcrystalline cellulose (MCC). AlCl3 and H3PO4 were selected as the Lewis acidic catalyst and Bronsted acidic catalyst, respectively, and the influence of these two catalysts on the conversion behavior of MCC was studied. The results showed that MCC could be selectively converted into HMF or levulinic acid (LA) by altering the solvent composition. As for the composition of the catalyst, high AlCl3 content favored the generation of HMF, whereas high H3PO4 content could decrease the HMF yield and promote the formation of glucose and fructose. The highest HMF yield of 49.42% was obtained at an AlCl3–H3PO4 ratio of 1 : 0.8. GC-MS analysis suggested that much MCC was transformed into furans and cyclopentenones in the presence of AlCl3, while anhydrosugars tended to be generated with a high H3PO4 proportion in the catalyst. Besides, FTIR analysis of the insoluble humin formed during MCC conversion indicated that AlCl3 could also facilitate the depolymerization of MCC.
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conversion of c5 carbohydrates into furfural catalyzed by a lewis acidic ionic liquid in renewable γ valerolactone
Green Chemistry, 2017Co-Authors: Shurong Wang, Haizhou Lin, Jingping Chen, Yuan Zhao, Lingjun Zhu, Zhongyang LuoAbstract:For the purpose of building a green Reaction System to produce furfural (FF), the conversion of two important pentoses from hemicellulose, namely xylose and arabinose, was investigated in an aqueous Reaction System including a Lewis acidic ionic liquid as a catalyst and renewable γ-valerolactone (GVL) as a co-solvent. The results showed that the introduction of GVL greatly improved the reactivity of pentose and inhibited the secondary decomposition Reaction of FF compared to a pure-water Reaction System. NMR analysis suggested that the composition of pentose conformers was greatly altered towards a reactive distribution. The highest FF yields were 79.76% (from xylose) and 58.70% (from arabinose), which were obtained at 140 °C. The influence of Reaction parameters on pentose conversion was also studied. A comparison between different Reaction conditions suggested that arabinose had less reactivity than xylose, leading to its lower conversion rate and FF yield. Furthermore, xylan and real biomass materials were tested in the proposed Reaction System, and decent FF yields of up to 69.66% (from xylan) and 47.96% (from corn stalk) were obtained.
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conversion of carbohydrates into 5 hydroxymethylfurfural in a green Reaction System of co2 water isopropanol
Aiche Journal, 2017Co-Authors: Haizhou Lin, Qingang Xiong, Jingping Chen, Yuan Zhao, Shurong WangAbstract:In this work, a green Reaction System of CO2-water-isopropanol was developed for 5-hydroxymethylfurfural (HMF) production. The conversion of fructose in a CO2-water System was first investigated, and the results showed this System could promote the formation of HMF compared to a pure water System. Then, isopropanol was introduced into the CO2-water System and the HMF formation became better because the solvent effect of isopropanol increased the tautomeric composition of fructofuranose, which was easy to form HMF. The existence of isopropanol was found to greatly suppress secondary Reactions where HMF was converted to levulinic acid and insoluble humin. Meanwhile, the effects of Reaction parameters on the conversion of fructose to HMF in the CO2-water-isopropanol System were analyzed, and a high HMF yield of 67.14% was obtained. Finally, to further illustrate the merits of CO2-water-isopropanol System, productions of HMF from other carbohydrates were tested and satisfactory yields were achieved. © 2016 American Institute of Chemical Engineers AIChE J, 63: 257–265, 2017
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conversion of carbohydrates into 5 hydroxymethylfurfural in an advanced single phase Reaction System consisting of water and 1 2 dimethoxyethane
RSC Advances, 2015Co-Authors: Shurong Wang, Jingping Chen, Yuan Zhao, Bin Ru, Jinsong ZhouAbstract:5-Hydroxymethylfurfural (HMF) is a bio-based platform chemical that may be converted into various chemicals and fuels. In the present study, we developed an advanced low-boiling single-phase Reaction System for producing HMF from glucose. It consists of water and 1,2-dimethoxyethane (DMOE) and uses AlCl3 as catalyst. Our results show that introduction of DMOE can substantially enhance HMF production because of the polar aprotic solvent effect provided by DMOE. Under optimal conditions, a high HMF yield (58.56%) was obtained. GC-MS of the liquid-phase products revealed that HMF and furans comprised 80% and ∼90% of the detected products. Formation of liquid-phase products, including furans, oxygenated aliphatics, cyclopenten-1-ones, and pyrans is discussed. Further study of the humins formed during glucose conversion showed the effective inhibition of humin formation by DMOE. The structure of humins was characterized by FTIR spectroscopy. Finally, HMF production from disaccharides (sucrose, maltose and cellobiose) and polysaccharide (cellulose) using the water–DMOE System resulted in good yields, demonstrating that our single-phase water–DMOE solvent System has good potential use in HMF production from glucose and complex carbohydrates.
Yuan Zhao - One of the best experts on this subject based on the ideXlab platform.
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influence of a lewis acid and a bronsted acid on the conversion of microcrystalline cellulose into 5 hydroxymethylfurfural in a single phase Reaction System of water and 1 2 dimethoxyethane
RSC Advances, 2018Co-Authors: Yuan Zhao, Jingping Chen, Shurong Wang, Hao XuAbstract:5-Hydroxymethylfurfural (HMF) is a typical dehydration product of C6 carbohydrates, and it can be converted into a series of chemicals and liquid fuels. In this study, an advanced low-boiling single-phase Reaction System consisting of water and 1,2-dimethoxyethane (DMOE) was proposed for the production of HMF from microcrystalline cellulose (MCC). AlCl3 and H3PO4 were selected as the Lewis acidic catalyst and Bronsted acidic catalyst, respectively, and the influence of these two catalysts on the conversion behavior of MCC was studied. The results showed that MCC could be selectively converted into HMF or levulinic acid (LA) by altering the solvent composition. As for the composition of the catalyst, high AlCl3 content favored the generation of HMF, whereas high H3PO4 content could decrease the HMF yield and promote the formation of glucose and fructose. The highest HMF yield of 49.42% was obtained at an AlCl3–H3PO4 ratio of 1 : 0.8. GC-MS analysis suggested that much MCC was transformed into furans and cyclopentenones in the presence of AlCl3, while anhydrosugars tended to be generated with a high H3PO4 proportion in the catalyst. Besides, FTIR analysis of the insoluble humin formed during MCC conversion indicated that AlCl3 could also facilitate the depolymerization of MCC.
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conversion of c5 carbohydrates into furfural catalyzed by a lewis acidic ionic liquid in renewable γ valerolactone
Green Chemistry, 2017Co-Authors: Shurong Wang, Haizhou Lin, Jingping Chen, Yuan Zhao, Lingjun Zhu, Zhongyang LuoAbstract:For the purpose of building a green Reaction System to produce furfural (FF), the conversion of two important pentoses from hemicellulose, namely xylose and arabinose, was investigated in an aqueous Reaction System including a Lewis acidic ionic liquid as a catalyst and renewable γ-valerolactone (GVL) as a co-solvent. The results showed that the introduction of GVL greatly improved the reactivity of pentose and inhibited the secondary decomposition Reaction of FF compared to a pure-water Reaction System. NMR analysis suggested that the composition of pentose conformers was greatly altered towards a reactive distribution. The highest FF yields were 79.76% (from xylose) and 58.70% (from arabinose), which were obtained at 140 °C. The influence of Reaction parameters on pentose conversion was also studied. A comparison between different Reaction conditions suggested that arabinose had less reactivity than xylose, leading to its lower conversion rate and FF yield. Furthermore, xylan and real biomass materials were tested in the proposed Reaction System, and decent FF yields of up to 69.66% (from xylan) and 47.96% (from corn stalk) were obtained.
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conversion of carbohydrates into 5 hydroxymethylfurfural in a green Reaction System of co2 water isopropanol
Aiche Journal, 2017Co-Authors: Haizhou Lin, Qingang Xiong, Jingping Chen, Yuan Zhao, Shurong WangAbstract:In this work, a green Reaction System of CO2-water-isopropanol was developed for 5-hydroxymethylfurfural (HMF) production. The conversion of fructose in a CO2-water System was first investigated, and the results showed this System could promote the formation of HMF compared to a pure water System. Then, isopropanol was introduced into the CO2-water System and the HMF formation became better because the solvent effect of isopropanol increased the tautomeric composition of fructofuranose, which was easy to form HMF. The existence of isopropanol was found to greatly suppress secondary Reactions where HMF was converted to levulinic acid and insoluble humin. Meanwhile, the effects of Reaction parameters on the conversion of fructose to HMF in the CO2-water-isopropanol System were analyzed, and a high HMF yield of 67.14% was obtained. Finally, to further illustrate the merits of CO2-water-isopropanol System, productions of HMF from other carbohydrates were tested and satisfactory yields were achieved. © 2016 American Institute of Chemical Engineers AIChE J, 63: 257–265, 2017
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conversion of carbohydrates into 5 hydroxymethylfurfural in an advanced single phase Reaction System consisting of water and 1 2 dimethoxyethane
RSC Advances, 2015Co-Authors: Shurong Wang, Jingping Chen, Yuan Zhao, Bin Ru, Jinsong ZhouAbstract:5-Hydroxymethylfurfural (HMF) is a bio-based platform chemical that may be converted into various chemicals and fuels. In the present study, we developed an advanced low-boiling single-phase Reaction System for producing HMF from glucose. It consists of water and 1,2-dimethoxyethane (DMOE) and uses AlCl3 as catalyst. Our results show that introduction of DMOE can substantially enhance HMF production because of the polar aprotic solvent effect provided by DMOE. Under optimal conditions, a high HMF yield (58.56%) was obtained. GC-MS of the liquid-phase products revealed that HMF and furans comprised 80% and ∼90% of the detected products. Formation of liquid-phase products, including furans, oxygenated aliphatics, cyclopenten-1-ones, and pyrans is discussed. Further study of the humins formed during glucose conversion showed the effective inhibition of humin formation by DMOE. The structure of humins was characterized by FTIR spectroscopy. Finally, HMF production from disaccharides (sucrose, maltose and cellobiose) and polysaccharide (cellulose) using the water–DMOE System resulted in good yields, demonstrating that our single-phase water–DMOE solvent System has good potential use in HMF production from glucose and complex carbohydrates.
Shifu Chen - One of the best experts on this subject based on the ideXlab platform.
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Photocatalytic organic transformations: Simultaneous oxidation of aromatic alcohols and reduction of nitroarenes on CdLa2S4 in one Reaction System
Applied Catalysis B-environmental, 2018Co-Authors: Sujuan Zhang, Sugang Meng, Xianliang Fu, Xiangju Ye, Xiuzhen Zheng, Weixin Huang, Shifu ChenAbstract:Abstract Photocatalytic selective organic transformations (SOTs) with sunlight offer a “green” route for synthesis of fine chemicals. In this work, a bare ternary chalcogenide CdLa2S4 photocatalyst was fabricated to couple the selective oxidation (SO) of aromatic alcohols to aldehydes and selective reduction (SR) of nitroarenes to anilines in one Reaction System. The photocatalyst showed a high stability and a good generality for the conversions due to the well–matched band structure and the high separation efficiency of photoinduced electrons (e–) and holes (h+). For p–substituted aromatic alcohols, the selectivities to the corresponding aldehydes are as high as ca. 90%. The electro–donating substituent in the para position benefits the SO Reactions, which are triggered by h+ via a successive deprotonation; while for p–substituted nitroarenes, the SR to the corresponding anilines is vulnerable to the electro–withdrawing groups and the steric hindrance of the substituent and the selectivities to anilines are substantially lower than that of the SO conversions. H+ deprotonated in the SO of aromatic alcohols is indispensable for the SR of nitroarenes as they are achieved by a H+–coupled six e– reduction process, which leads to the low conversion efficiencies. The half conversions not only be coupled by the photoinduced e– and h+, but also collaborate with each other through H+. Our results clearly demonstrate the emerging concept of a coupled Reaction System for sunlight–driven synthesis of fine chemicals and reveal the underlying mechanism.
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Ultra-low content of Pt modified CdS nanorods: Preparation, characterization, and application for photocatalytic selective oxidation of aromatic alcohols and reduction of nitroarenes in one Reaction System
Journal of Hazardous Materials, 2018Co-Authors: Sujuan Zhang, Sugang Meng, Xianliang Fu, Gaoli Chen, Weixin Huang, Shifu ChenAbstract:Abstract A series of Pt nanoparticles (with size of 3–4 nm) decorated CdS nanorods were prepared via a simple solvothermal method. The samples were then used for photocatalytic selective oxidation (SO) of aromatic alcohols and reduction (SR) of nitroarenes in one Reaction System. The platinized samples showed enhanced activity for the conversions than pristine CdS as Pt can serve as e− trapping and Reaction sites, by which the recombination of photoinduced charge carriers can be suppressed and the adsorption of reactants and the SR of nitroarenes can be promoted. The sample loaded with only of 0.03% Pt showed the highest performance and, after irradiation for 4 h, the conversions of p-methoxybenzyl alcohol and nitrobenzene are as high as 92.7% and 94.8%, while the yields of p-methoxybenzaldehyde and aniline are 80.5% and 36.0%. The activities are about 2.0 times higher than that of CdS. The coupling Reaction mechanism for the SO of aromatic alcohols to aldehydes and SR of nitroarenes to anilines in the Reaction System was finally proposed.
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simultaneous dehydrogenation and hydrogenolysis of aromatic alcohols in one Reaction System via visible light driven heterogeneous photocatalysis
Journal of Catalysis, 2018Co-Authors: Sugang Meng, Xiaofeng Ning, Susheng Chang, Shifu ChenAbstract:Abstract Photocatalytic selective organic transformation using photoexcited holes and electrons has attracted worldwide interest. Although extensive studies have made significant progress in dehydrogenation of alcohols, hydrogenolysis of alcohols using photoexcited electrons directly constitutes a challenge. Here, photocatalytic selective dehydrogenation and hydrogenolysis of aromatic alcohols into corresponding alkanes/ethers and aldehydes has been achieved by direct use of photoexcited electrons and holes over CdS under visible light irradiation. Compared with other popular visible-light-driven photocatalysts, Sb 2 S 3 , Bi 2 O 3 , N-doped TiO 2 , Zn 3 In 2 S 6 , g-C 3 N 4 , and Ce 2 S 3 , the sum of the yields of alkanes and aldehydes over the as-prepared CdS could reach up to 94% after Reaction for 4 h. The high photoactivity and stability of CdS toward dehydrogenation and hydrogenolysis of aromatic alcohols can be ascribed to its appropriate band potentials and effective charge separation–transportation. The optimum positions are that the valence band position should be located between oxidation potentials of alcohol/aldehyde and aldehyde/oxidized aldehyde, and the conduction band position should be more slightly negative than reduction potential of alkane/alcohol. During this Reaction, the dehydrogenation Reaction consumes two holes and produces two protons; the hydrogenolysis process depletes two electrons and two protons. Therefore, a cooperative, cyclical, and efficient Reaction System was established.
Jingping Chen - One of the best experts on this subject based on the ideXlab platform.
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influence of a lewis acid and a bronsted acid on the conversion of microcrystalline cellulose into 5 hydroxymethylfurfural in a single phase Reaction System of water and 1 2 dimethoxyethane
RSC Advances, 2018Co-Authors: Yuan Zhao, Jingping Chen, Shurong Wang, Hao XuAbstract:5-Hydroxymethylfurfural (HMF) is a typical dehydration product of C6 carbohydrates, and it can be converted into a series of chemicals and liquid fuels. In this study, an advanced low-boiling single-phase Reaction System consisting of water and 1,2-dimethoxyethane (DMOE) was proposed for the production of HMF from microcrystalline cellulose (MCC). AlCl3 and H3PO4 were selected as the Lewis acidic catalyst and Bronsted acidic catalyst, respectively, and the influence of these two catalysts on the conversion behavior of MCC was studied. The results showed that MCC could be selectively converted into HMF or levulinic acid (LA) by altering the solvent composition. As for the composition of the catalyst, high AlCl3 content favored the generation of HMF, whereas high H3PO4 content could decrease the HMF yield and promote the formation of glucose and fructose. The highest HMF yield of 49.42% was obtained at an AlCl3–H3PO4 ratio of 1 : 0.8. GC-MS analysis suggested that much MCC was transformed into furans and cyclopentenones in the presence of AlCl3, while anhydrosugars tended to be generated with a high H3PO4 proportion in the catalyst. Besides, FTIR analysis of the insoluble humin formed during MCC conversion indicated that AlCl3 could also facilitate the depolymerization of MCC.
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conversion of c5 carbohydrates into furfural catalyzed by a lewis acidic ionic liquid in renewable γ valerolactone
Green Chemistry, 2017Co-Authors: Shurong Wang, Haizhou Lin, Jingping Chen, Yuan Zhao, Lingjun Zhu, Zhongyang LuoAbstract:For the purpose of building a green Reaction System to produce furfural (FF), the conversion of two important pentoses from hemicellulose, namely xylose and arabinose, was investigated in an aqueous Reaction System including a Lewis acidic ionic liquid as a catalyst and renewable γ-valerolactone (GVL) as a co-solvent. The results showed that the introduction of GVL greatly improved the reactivity of pentose and inhibited the secondary decomposition Reaction of FF compared to a pure-water Reaction System. NMR analysis suggested that the composition of pentose conformers was greatly altered towards a reactive distribution. The highest FF yields were 79.76% (from xylose) and 58.70% (from arabinose), which were obtained at 140 °C. The influence of Reaction parameters on pentose conversion was also studied. A comparison between different Reaction conditions suggested that arabinose had less reactivity than xylose, leading to its lower conversion rate and FF yield. Furthermore, xylan and real biomass materials were tested in the proposed Reaction System, and decent FF yields of up to 69.66% (from xylan) and 47.96% (from corn stalk) were obtained.
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conversion of carbohydrates into 5 hydroxymethylfurfural in a green Reaction System of co2 water isopropanol
Aiche Journal, 2017Co-Authors: Haizhou Lin, Qingang Xiong, Jingping Chen, Yuan Zhao, Shurong WangAbstract:In this work, a green Reaction System of CO2-water-isopropanol was developed for 5-hydroxymethylfurfural (HMF) production. The conversion of fructose in a CO2-water System was first investigated, and the results showed this System could promote the formation of HMF compared to a pure water System. Then, isopropanol was introduced into the CO2-water System and the HMF formation became better because the solvent effect of isopropanol increased the tautomeric composition of fructofuranose, which was easy to form HMF. The existence of isopropanol was found to greatly suppress secondary Reactions where HMF was converted to levulinic acid and insoluble humin. Meanwhile, the effects of Reaction parameters on the conversion of fructose to HMF in the CO2-water-isopropanol System were analyzed, and a high HMF yield of 67.14% was obtained. Finally, to further illustrate the merits of CO2-water-isopropanol System, productions of HMF from other carbohydrates were tested and satisfactory yields were achieved. © 2016 American Institute of Chemical Engineers AIChE J, 63: 257–265, 2017
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conversion of carbohydrates into 5 hydroxymethylfurfural in an advanced single phase Reaction System consisting of water and 1 2 dimethoxyethane
RSC Advances, 2015Co-Authors: Shurong Wang, Jingping Chen, Yuan Zhao, Bin Ru, Jinsong ZhouAbstract:5-Hydroxymethylfurfural (HMF) is a bio-based platform chemical that may be converted into various chemicals and fuels. In the present study, we developed an advanced low-boiling single-phase Reaction System for producing HMF from glucose. It consists of water and 1,2-dimethoxyethane (DMOE) and uses AlCl3 as catalyst. Our results show that introduction of DMOE can substantially enhance HMF production because of the polar aprotic solvent effect provided by DMOE. Under optimal conditions, a high HMF yield (58.56%) was obtained. GC-MS of the liquid-phase products revealed that HMF and furans comprised 80% and ∼90% of the detected products. Formation of liquid-phase products, including furans, oxygenated aliphatics, cyclopenten-1-ones, and pyrans is discussed. Further study of the humins formed during glucose conversion showed the effective inhibition of humin formation by DMOE. The structure of humins was characterized by FTIR spectroscopy. Finally, HMF production from disaccharides (sucrose, maltose and cellobiose) and polysaccharide (cellulose) using the water–DMOE System resulted in good yields, demonstrating that our single-phase water–DMOE solvent System has good potential use in HMF production from glucose and complex carbohydrates.
Baohui Wang - One of the best experts on this subject based on the ideXlab platform.
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one step valorization of calcium lignosulfonate to produce phenolics with the addition of solid base oxides in the hydrothermal Reaction System
Energy & Fuels, 2019Co-Authors: Hongjing Han, Haiying Wang, Yejun Han, Yanguang Chen, Yanan Zhang, Yizhen Wang, Baohui WangAbstract:A new process, named one-step valorization of calcium lignosulfonate (CSL), has been proposed and used to produce phenolics via the addition of solid base oxides in a hydrothermal Reaction System. A series of solid base oxides derived from layered double hydroxides (LDHs) were prepared by introducing ethanol. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses, temperature-programmed desorption of CO2 (CO2-TPD), Brunauer–Emmett–Teller (BET), flame atomic absorption spectrometry (FAAS), and X-ray photoelectron spectroscopy (XPS). Catalytic tests revealed that the liquid yield was approximately 75.82% under the action of NiMgFeOx during CSL depolymerization. Meanwhile, the solid residue accounted for only 19.71%, and the rest of the gaseous product was composed primarily of CO2. In the liquid product, the selectivity of phenolics was approximately 78.75% (24.19% phenol, 46.94% guaiacol, and 7.62...
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One-Step Valorization of Calcium Lignosulfonate To Produce Phenolics with the Addition of Solid Base Oxides in the Hydrothermal Reaction System
2019Co-Authors: Hongjing Han, Haiying Wang, Yejun Han, Yanguang Chen, Yanan Zhang, Yizhen Wang, Baohui WangAbstract:A new process, named one-step valorization of calcium lignosulfonate (CSL), has been proposed and used to produce phenolics via the addition of solid base oxides in a hydrothermal Reaction System. A series of solid base oxides derived from layered double hydroxides (LDHs) were prepared by introducing ethanol. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric (TG) and derivative thermogravimetric (DTG) analyses, temperature-programmed desorption of CO2 (CO2-TPD), Brunauer–Emmett–Teller (BET), flame atomic absorption spectrometry (FAAS), and X-ray photoelectron spectroscopy (XPS). Catalytic tests revealed that the liquid yield was approximately 75.82% under the action of NiMgFeOx during CSL depolymerization. Meanwhile, the solid residue accounted for only 19.71%, and the rest of the gaseous product was composed primarily of CO2. In the liquid product, the selectivity of phenolics was approximately 78.75% (24.19% phenol, 46.94% guaiacol, and 7.62% syringol). The gel permeation chromatography (GPC) analysis of the tetrahydrofuran soluble residues showed that CSL was efficiently depolymerized. Moreover, NiMgFeOx was recyclable and exhibited no significant loss of its catalytic activity after four runs
