Tungstic Acid

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Tao Zhang - One of the best experts on this subject based on the ideXlab platform.

  • remarkable effect of extremely dilute h2so4 on the cellulose conversion to ethylene glycol
    Applied Catalysis A-general, 2015
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Jianzhong Yin, Tao Zhang
    Abstract:

    Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that Tungstic Acid plays a key role in selective C-C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of Tungstic Acid, a series of additives were investigated in this work. Among various Acid additives, H2SO4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H2SO4/H2WO4 molar ratio of 0.03 and a H2WO4/cellulose weight ratio of 0.05, that is, an extremely dilute Acid concentration. Weakly Acidic sulfates (e.g., CuSO4 and FeSO4) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of Tungstic Acid, through promoting the hydrolysis of cellulose. (C) 2015 Elsevier B.V. All rights reserved.

  • catalytic conversion of concentrated miscanthus in water for ethylene glycol production
    Aiche Journal, 2014
    Co-Authors: Jifeng Pang, Aiqin Wang, Mingyuan Zheng, Ruiyan Sun, Hua Wang, Yu Jiang, Tao Zhang
    Abstract:

    Miscanthus, a promising energy crop, was used for ethylene glycol (EG) production through one-pot catalytic conversion. With a binary catalyst composed of commercial Tungstic Acid and Raney Ni, the miscanthus with 1 % concentration was transformed into EG with a yield of 35.5%. However, the yield dropped to 13.6% as the miscanthus concentration was increased to 10 %. The underlying reason for the yield decrease was disclosed through analysis of the liquid products, investigation of pretreatments, and characterization of the catalysts. It was found that the protectors on the surface of miscanthus and the lignin component underwent decomposition under reaction conditions, resulting in the formation of some organic Acids and unsaturated compounds that preferentially poisoned the Raney Ni catalyst and consequently decreased the EG yield. When the inhibitors were effectively removed by base solvent pretreatment, the EG yield was successfully improved to 39.0% even under 10% concentration of feedstock. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2254–2262, 2014

  • catalytic conversion of cellulose to ethylene glycol over a low cost binary catalyst of raney ni and Tungstic Acid
    Chemsuschem, 2013
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Zhijun Tai, Junying Zhang, Tao Zhang
    Abstract:

    Following our previous report on the selective transformation of cellulose to ethylene glycol (EG) over a binary catalyst composed of Tungstic Acid and Ru/C, we herein report a new low-cost but more effective binary catalyst by using Raney nickel in place of Ru/C (Raney Ni+H2WO4). In addition to Tungstic Acid, other W compounds were also investigated in combination with Raney Ni. The results showed that the EG yield depended on the W compound: H4SiW12O40reusability; it could be reused at least 17 times without any decay in the EG yield, which shows its great potential for industrial applications.

Jifeng Pang - One of the best experts on this subject based on the ideXlab platform.

  • remarkable effect of extremely dilute h2so4 on the cellulose conversion to ethylene glycol
    Applied Catalysis A-general, 2015
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Jianzhong Yin, Tao Zhang
    Abstract:

    Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that Tungstic Acid plays a key role in selective C-C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of Tungstic Acid, a series of additives were investigated in this work. Among various Acid additives, H2SO4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H2SO4/H2WO4 molar ratio of 0.03 and a H2WO4/cellulose weight ratio of 0.05, that is, an extremely dilute Acid concentration. Weakly Acidic sulfates (e.g., CuSO4 and FeSO4) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of Tungstic Acid, through promoting the hydrolysis of cellulose. (C) 2015 Elsevier B.V. All rights reserved.

  • catalytic conversion of concentrated miscanthus in water for ethylene glycol production
    Aiche Journal, 2014
    Co-Authors: Jifeng Pang, Aiqin Wang, Mingyuan Zheng, Ruiyan Sun, Hua Wang, Yu Jiang, Tao Zhang
    Abstract:

    Miscanthus, a promising energy crop, was used for ethylene glycol (EG) production through one-pot catalytic conversion. With a binary catalyst composed of commercial Tungstic Acid and Raney Ni, the miscanthus with 1 % concentration was transformed into EG with a yield of 35.5%. However, the yield dropped to 13.6% as the miscanthus concentration was increased to 10 %. The underlying reason for the yield decrease was disclosed through analysis of the liquid products, investigation of pretreatments, and characterization of the catalysts. It was found that the protectors on the surface of miscanthus and the lignin component underwent decomposition under reaction conditions, resulting in the formation of some organic Acids and unsaturated compounds that preferentially poisoned the Raney Ni catalyst and consequently decreased the EG yield. When the inhibitors were effectively removed by base solvent pretreatment, the EG yield was successfully improved to 39.0% even under 10% concentration of feedstock. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2254–2262, 2014

  • catalytic conversion of cellulose to ethylene glycol over a low cost binary catalyst of raney ni and Tungstic Acid
    Chemsuschem, 2013
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Zhijun Tai, Junying Zhang, Tao Zhang
    Abstract:

    Following our previous report on the selective transformation of cellulose to ethylene glycol (EG) over a binary catalyst composed of Tungstic Acid and Ru/C, we herein report a new low-cost but more effective binary catalyst by using Raney nickel in place of Ru/C (Raney Ni+H2WO4). In addition to Tungstic Acid, other W compounds were also investigated in combination with Raney Ni. The results showed that the EG yield depended on the W compound: H4SiW12O40reusability; it could be reused at least 17 times without any decay in the EG yield, which shows its great potential for industrial applications.

Aiqin Wang - One of the best experts on this subject based on the ideXlab platform.

  • remarkable effect of extremely dilute h2so4 on the cellulose conversion to ethylene glycol
    Applied Catalysis A-general, 2015
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Jianzhong Yin, Tao Zhang
    Abstract:

    Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that Tungstic Acid plays a key role in selective C-C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of Tungstic Acid, a series of additives were investigated in this work. Among various Acid additives, H2SO4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H2SO4/H2WO4 molar ratio of 0.03 and a H2WO4/cellulose weight ratio of 0.05, that is, an extremely dilute Acid concentration. Weakly Acidic sulfates (e.g., CuSO4 and FeSO4) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of Tungstic Acid, through promoting the hydrolysis of cellulose. (C) 2015 Elsevier B.V. All rights reserved.

  • catalytic conversion of concentrated miscanthus in water for ethylene glycol production
    Aiche Journal, 2014
    Co-Authors: Jifeng Pang, Aiqin Wang, Mingyuan Zheng, Ruiyan Sun, Hua Wang, Yu Jiang, Tao Zhang
    Abstract:

    Miscanthus, a promising energy crop, was used for ethylene glycol (EG) production through one-pot catalytic conversion. With a binary catalyst composed of commercial Tungstic Acid and Raney Ni, the miscanthus with 1 % concentration was transformed into EG with a yield of 35.5%. However, the yield dropped to 13.6% as the miscanthus concentration was increased to 10 %. The underlying reason for the yield decrease was disclosed through analysis of the liquid products, investigation of pretreatments, and characterization of the catalysts. It was found that the protectors on the surface of miscanthus and the lignin component underwent decomposition under reaction conditions, resulting in the formation of some organic Acids and unsaturated compounds that preferentially poisoned the Raney Ni catalyst and consequently decreased the EG yield. When the inhibitors were effectively removed by base solvent pretreatment, the EG yield was successfully improved to 39.0% even under 10% concentration of feedstock. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2254–2262, 2014

  • catalytic conversion of cellulose to ethylene glycol over a low cost binary catalyst of raney ni and Tungstic Acid
    Chemsuschem, 2013
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Zhijun Tai, Junying Zhang, Tao Zhang
    Abstract:

    Following our previous report on the selective transformation of cellulose to ethylene glycol (EG) over a binary catalyst composed of Tungstic Acid and Ru/C, we herein report a new low-cost but more effective binary catalyst by using Raney nickel in place of Ru/C (Raney Ni+H2WO4). In addition to Tungstic Acid, other W compounds were also investigated in combination with Raney Ni. The results showed that the EG yield depended on the W compound: H4SiW12O40reusability; it could be reused at least 17 times without any decay in the EG yield, which shows its great potential for industrial applications.

Zhijun Tai - One of the best experts on this subject based on the ideXlab platform.

  • catalytic conversion of cellulose to ethylene glycol over a low cost binary catalyst of raney ni and Tungstic Acid
    Chemsuschem, 2013
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Zhijun Tai, Junying Zhang, Tao Zhang
    Abstract:

    Following our previous report on the selective transformation of cellulose to ethylene glycol (EG) over a binary catalyst composed of Tungstic Acid and Ru/C, we herein report a new low-cost but more effective binary catalyst by using Raney nickel in place of Ru/C (Raney Ni+H2WO4). In addition to Tungstic Acid, other W compounds were also investigated in combination with Raney Ni. The results showed that the EG yield depended on the W compound: H4SiW12O40reusability; it could be reused at least 17 times without any decay in the EG yield, which shows its great potential for industrial applications.

Mingyuan Zheng - One of the best experts on this subject based on the ideXlab platform.

  • remarkable effect of extremely dilute h2so4 on the cellulose conversion to ethylene glycol
    Applied Catalysis A-general, 2015
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Jianzhong Yin, Tao Zhang
    Abstract:

    Cellulose is the most abundant biomass in nature, and its catalytic conversion to commodity chemical ethylene glycol represents an important advance towards sustainable chemistry. In previous work, we have shown that Tungstic Acid plays a key role in selective C-C cleavage to form glycolaldehyde and then ethylene glycol. To further enhance the efficiency of Tungstic Acid, a series of additives were investigated in this work. Among various Acid additives, H2SO4 stands out as the most remarkable additive; ethylene glycol yield was enhanced from 32.6% to 52.6% at a H2SO4/H2WO4 molar ratio of 0.03 and a H2WO4/cellulose weight ratio of 0.05, that is, an extremely dilute Acid concentration. Weakly Acidic sulfates (e.g., CuSO4 and FeSO4) have also been demonstrated to be highly efficient additives to improve the catalytic efficiency of Tungstic Acid, through promoting the hydrolysis of cellulose. (C) 2015 Elsevier B.V. All rights reserved.

  • catalytic conversion of concentrated miscanthus in water for ethylene glycol production
    Aiche Journal, 2014
    Co-Authors: Jifeng Pang, Aiqin Wang, Mingyuan Zheng, Ruiyan Sun, Hua Wang, Yu Jiang, Tao Zhang
    Abstract:

    Miscanthus, a promising energy crop, was used for ethylene glycol (EG) production through one-pot catalytic conversion. With a binary catalyst composed of commercial Tungstic Acid and Raney Ni, the miscanthus with 1 % concentration was transformed into EG with a yield of 35.5%. However, the yield dropped to 13.6% as the miscanthus concentration was increased to 10 %. The underlying reason for the yield decrease was disclosed through analysis of the liquid products, investigation of pretreatments, and characterization of the catalysts. It was found that the protectors on the surface of miscanthus and the lignin component underwent decomposition under reaction conditions, resulting in the formation of some organic Acids and unsaturated compounds that preferentially poisoned the Raney Ni catalyst and consequently decreased the EG yield. When the inhibitors were effectively removed by base solvent pretreatment, the EG yield was successfully improved to 39.0% even under 10% concentration of feedstock. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2254–2262, 2014

  • catalytic conversion of cellulose to ethylene glycol over a low cost binary catalyst of raney ni and Tungstic Acid
    Chemsuschem, 2013
    Co-Authors: Aiqin Wang, Mingyuan Zheng, Jifeng Pang, Zhijun Tai, Junying Zhang, Tao Zhang
    Abstract:

    Following our previous report on the selective transformation of cellulose to ethylene glycol (EG) over a binary catalyst composed of Tungstic Acid and Ru/C, we herein report a new low-cost but more effective binary catalyst by using Raney nickel in place of Ru/C (Raney Ni+H2WO4). In addition to Tungstic Acid, other W compounds were also investigated in combination with Raney Ni. The results showed that the EG yield depended on the W compound: H4SiW12O40reusability; it could be reused at least 17 times without any decay in the EG yield, which shows its great potential for industrial applications.

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