The Experts below are selected from a list of 1182 Experts worldwide ranked by ideXlab platform

Shouyun Cheng - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic Liquefaction of pine sawdust and in situ hydrogenation of bio crude over bifunctional co zn hzsm 5 catalysts
    Fuel, 2018
    Co-Authors: Lin Wei, Shouyun Cheng, Muhammad Rabnawaz
    Abstract:

    Abstract Catalytic Liquefaction is an effective method for bio-crude production, but the development of efficient catalysts remains a challenge. Bifunctional Co/HZSM-5, Zn/HZSM-5 and Co-Zn/HZSM-5 catalysts were integrated with zinc hydrolysis to produce upgraded bio-crude. Co or Zn modified HZSM-5 catalysts improved the yields of bio-crude and gas compared to no catalyst treatment. Co or Zn modified HZSM-5 catalysts decreased the contents of oxygenated compounds including ketones, acids, alcohols and phenols. Co or Zn loaded HZSM-5 catalysts improved the hydrocarbons contents. Compared to monometallic Co/HZSM-5 and Zn/HZSM-5, bimetallic Co-Zn/HZSM-5 generated bio-crude with higher quality due to the synergistic effect of Co and Zn on HZSM-5 support. Co-Zn/HZSM-5 produced the highest bio-crude yield at 67.38 wt%, and the highest hydrocarbons content of bio-crude produced was 18.59%.

  • Catalytic Liquefaction of pine sawdust for biofuel development on bifunctional zn hzsm 5 catalyst in supercritical ethanol
    Journal of Analytical and Applied Pyrolysis, 2017
    Co-Authors: Shouyun Cheng, Lin Wei, James Julson, P Kharel, Yuhe Cao
    Abstract:

    Abstract Catalytic Liquefaction can effectively convert solid biomass into liquid bio-crude that could be upgraded to advanced biofuel, but the exploration of green and efficient catalysts remain a challenge. In this study, bifunctional Zn/HZSM-5 catalysts were firstly combined with supercritical ethanol to produce bio-crude in pine sawdust Catalytic Liquefaction. The catalysts were characterized by BET, NH 3 -TPD, XRD and TEM. The effects of Zn/HZSM-5 catalysts with different Zn loading ratios on the yield and quality of bio-crude and gas were investigated. The results showed that Zn/HZSM-5 and HZSM-5 catalysts improved the yields of bio-crude compared to no catalyst treatment. The use of HZSM-5 based catalysts reduced the contents of oxygenated compounds including acids, ketones, phenols and alcohols in bio-crude products. Hydrocarbons content of the bio-crudes produced by HZSM-5 based catalysts increased compared to bio-crude produced by no catalyst treatment. Compared to HZSM-5 catalyst, Zn/HZSM-5 catalysts exhibited better catalyst performance to improve bio-crude quality due to the additional decarbonylation, decarboxylation and dehydrogenation reactions induced by Zn loading. 15%Zn/HZSM-5 catalyst resulted in the highest yields of bio-crude at 59.09 wt.%, and 10%Zn/HZSM-5 catalyst produced bio-crude with the highest hydrocarbons content at 15.03%. The four stages of mechanism for biomass Liquefaction reactions on Zn/HZSM-5 catalysts in supercritical ethanol was proposed.

Harold H. Schobert - One of the best experts on this subject based on the ideXlab platform.

  • effects of drying and oxidation of wyodak subbituminous coal on its thermal and Catalytic Liquefaction spectroscopic characterization and products distribution
    Energy & Fuels, 1994
    Co-Authors: Chunshan Song, Ajay K Saini, Harold H. Schobert
    Abstract:

    Drying and oxidation of Wyodak subbituminous coal at 100-150° C have been shown to have significant effects on its structure and on its Catalytic and nonCatalytic low-severity Liquefaction at 350° C for 30 min under 6.9 MPa of H 2 . Spectroscopic analyses using solid-state 13 C NMR, pyrolysis- GC-MS, and FT-IR revealed that oxidative drying at 100-150° C causes the transformation of phenolics and catechol into other related structures (presumably via condensation) and high-severity air drying at 150° C for 20 h leads to disappearance of catechol-like structure. Increasing air drying time or temperature increases oxidation to form more oxygen functional groups at the expense of aliphatic carbons

  • swelling pretreatment of coals for improved Catalytic Liquefaction
    Fuel, 1992
    Co-Authors: Levent Artok, Alan Davis, Gareth D Mitchell, Harold H. Schobert
    Abstract:

    Abstract Two coals, a Texas lignite and a Utah high volatile C bituminous, were used to examine the effects of solvent swelling pretreatment and catalyst impregnation on conversion behaviour at 275 °C, representative of the first, low-temperature stage in a temperature-staged Liquefaction reaction. Iron(II) sulphate, iron pentacarbonyl, ammonium tetrathiomolybdate, and molybdenum hexacarbonyl were used as catalyst precursors. Without swelling pretreatment, impregnation of both coals increased conversion, mainly through increased yields of preasphaltenes. Methanol, tetrahydrofuran, tetrabutylammonium hydroxide, and pyridine were used as swelling agents. In the absence of catalyst, swelling the lignite before reaction improves conversion by enhancing oil and gas yields; the effectiveness of the solvents in enhancing conversion is in the same order as their swelling ratios. Swelling with methanol or pyridine has little effect on reaction of the bituminous coal, but both tetrahydrofuran and tetrabutylammonium hydroxide treatments increase conversion as a result of higher preasphaltene yields. The combined effect of catalyst addition and swelling enhances conversion, as much as two-fold, of the lignite and increases yields of all products. On the other hand, little benefit was obtained by combining catalyst addition and swelling for the bituminous coal, though it is possible to effect changes in the relative amounts of the various products. Tetrabutylammonium hydroxide not removed from the coal after pretreatment appears to decompose to the good solvent tributylamine, suggesting the possibility of using swelling agents as ‘solvent precursors’, first swelling the coal and then thermally decomposing to a strong solvent that is emplaced inside the coal. The action of iron pentacarbonyl is sensitive to the reactive gas atmosphere used; in hydrogen it decomposes to an oxide that mainly facilitates hydrogenation of the heavy products to lighter oils, whereas in hydrogen sulphide/hydrogen mixtures the iron pentacarbonyl is sulphided and mainly facilitates depolymerization of the coal to heavy products. This finding suggests the possibility of tailoring the behaviour of the catalyst by appropriate selection of catalyst precursor and reactive atmosphere.

  • Swelling pretreatment of coals for improved Catalytic Liquefaction
    1992
    Co-Authors: Levent Artok, Alan Davis, Harold H. Schobert
    Abstract:

    Two coals, a Texas lignite and a Utah high volatile C bituminous, were used to examine the effects of solvent swelling pretreatment and catalyst impregnation on conversion behaviour at 275 o C, representative of the first, low-temperature stage in a temperature-staged Liquefaction reaction. Iron(II) sulphate, iron pentacarbonyl, ammonium tetrathiomolybdate, and molybdenum hexacarbonyl were used as catalyst precursors. Without swelling pretreatment, impregnation of both coals increased conversion, mainly through increased yields of preasphaltenes

Yuhe Cao - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic Liquefaction of pine sawdust for biofuel development on bifunctional zn hzsm 5 catalyst in supercritical ethanol
    Journal of Analytical and Applied Pyrolysis, 2017
    Co-Authors: Shouyun Cheng, Lin Wei, James Julson, P Kharel, Yuhe Cao
    Abstract:

    Abstract Catalytic Liquefaction can effectively convert solid biomass into liquid bio-crude that could be upgraded to advanced biofuel, but the exploration of green and efficient catalysts remain a challenge. In this study, bifunctional Zn/HZSM-5 catalysts were firstly combined with supercritical ethanol to produce bio-crude in pine sawdust Catalytic Liquefaction. The catalysts were characterized by BET, NH 3 -TPD, XRD and TEM. The effects of Zn/HZSM-5 catalysts with different Zn loading ratios on the yield and quality of bio-crude and gas were investigated. The results showed that Zn/HZSM-5 and HZSM-5 catalysts improved the yields of bio-crude compared to no catalyst treatment. The use of HZSM-5 based catalysts reduced the contents of oxygenated compounds including acids, ketones, phenols and alcohols in bio-crude products. Hydrocarbons content of the bio-crudes produced by HZSM-5 based catalysts increased compared to bio-crude produced by no catalyst treatment. Compared to HZSM-5 catalyst, Zn/HZSM-5 catalysts exhibited better catalyst performance to improve bio-crude quality due to the additional decarbonylation, decarboxylation and dehydrogenation reactions induced by Zn loading. 15%Zn/HZSM-5 catalyst resulted in the highest yields of bio-crude at 59.09 wt.%, and 10%Zn/HZSM-5 catalyst produced bio-crude with the highest hydrocarbons content at 15.03%. The four stages of mechanism for biomass Liquefaction reactions on Zn/HZSM-5 catalysts in supercritical ethanol was proposed.

Muhammad Rabnawaz - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic Liquefaction of pine sawdust and in situ hydrogenation of bio crude over bifunctional co zn hzsm 5 catalysts
    Fuel, 2018
    Co-Authors: Lin Wei, Shouyun Cheng, Muhammad Rabnawaz
    Abstract:

    Abstract Catalytic Liquefaction is an effective method for bio-crude production, but the development of efficient catalysts remains a challenge. Bifunctional Co/HZSM-5, Zn/HZSM-5 and Co-Zn/HZSM-5 catalysts were integrated with zinc hydrolysis to produce upgraded bio-crude. Co or Zn modified HZSM-5 catalysts improved the yields of bio-crude and gas compared to no catalyst treatment. Co or Zn modified HZSM-5 catalysts decreased the contents of oxygenated compounds including ketones, acids, alcohols and phenols. Co or Zn loaded HZSM-5 catalysts improved the hydrocarbons contents. Compared to monometallic Co/HZSM-5 and Zn/HZSM-5, bimetallic Co-Zn/HZSM-5 generated bio-crude with higher quality due to the synergistic effect of Co and Zn on HZSM-5 support. Co-Zn/HZSM-5 produced the highest bio-crude yield at 67.38 wt%, and the highest hydrocarbons content of bio-crude produced was 18.59%.

Lin Wei - One of the best experts on this subject based on the ideXlab platform.

  • Catalytic Liquefaction of pine sawdust and in situ hydrogenation of bio crude over bifunctional co zn hzsm 5 catalysts
    Fuel, 2018
    Co-Authors: Lin Wei, Shouyun Cheng, Muhammad Rabnawaz
    Abstract:

    Abstract Catalytic Liquefaction is an effective method for bio-crude production, but the development of efficient catalysts remains a challenge. Bifunctional Co/HZSM-5, Zn/HZSM-5 and Co-Zn/HZSM-5 catalysts were integrated with zinc hydrolysis to produce upgraded bio-crude. Co or Zn modified HZSM-5 catalysts improved the yields of bio-crude and gas compared to no catalyst treatment. Co or Zn modified HZSM-5 catalysts decreased the contents of oxygenated compounds including ketones, acids, alcohols and phenols. Co or Zn loaded HZSM-5 catalysts improved the hydrocarbons contents. Compared to monometallic Co/HZSM-5 and Zn/HZSM-5, bimetallic Co-Zn/HZSM-5 generated bio-crude with higher quality due to the synergistic effect of Co and Zn on HZSM-5 support. Co-Zn/HZSM-5 produced the highest bio-crude yield at 67.38 wt%, and the highest hydrocarbons content of bio-crude produced was 18.59%.

  • Catalytic Liquefaction of pine sawdust for biofuel development on bifunctional zn hzsm 5 catalyst in supercritical ethanol
    Journal of Analytical and Applied Pyrolysis, 2017
    Co-Authors: Shouyun Cheng, Lin Wei, James Julson, P Kharel, Yuhe Cao
    Abstract:

    Abstract Catalytic Liquefaction can effectively convert solid biomass into liquid bio-crude that could be upgraded to advanced biofuel, but the exploration of green and efficient catalysts remain a challenge. In this study, bifunctional Zn/HZSM-5 catalysts were firstly combined with supercritical ethanol to produce bio-crude in pine sawdust Catalytic Liquefaction. The catalysts were characterized by BET, NH 3 -TPD, XRD and TEM. The effects of Zn/HZSM-5 catalysts with different Zn loading ratios on the yield and quality of bio-crude and gas were investigated. The results showed that Zn/HZSM-5 and HZSM-5 catalysts improved the yields of bio-crude compared to no catalyst treatment. The use of HZSM-5 based catalysts reduced the contents of oxygenated compounds including acids, ketones, phenols and alcohols in bio-crude products. Hydrocarbons content of the bio-crudes produced by HZSM-5 based catalysts increased compared to bio-crude produced by no catalyst treatment. Compared to HZSM-5 catalyst, Zn/HZSM-5 catalysts exhibited better catalyst performance to improve bio-crude quality due to the additional decarbonylation, decarboxylation and dehydrogenation reactions induced by Zn loading. 15%Zn/HZSM-5 catalyst resulted in the highest yields of bio-crude at 59.09 wt.%, and 10%Zn/HZSM-5 catalyst produced bio-crude with the highest hydrocarbons content at 15.03%. The four stages of mechanism for biomass Liquefaction reactions on Zn/HZSM-5 catalysts in supercritical ethanol was proposed.