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Conversion of Cellulose and Cellobiose into Sorbitol Catalyzed by Ruthenium Supported on a Polyoxometalate/Metal–Organic Framework Hybrid

Authors

  • Prof. Dr. Jinzhu Chen,

    Corresponding author
    1. Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380
    • Jinzhu Chen, Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380

      Limin Chen, College of Environment and Energy, South China University of Technology, Guangzhou 510006 (PR China)

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  • Shengpei Wang,

    1. Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049 (PR China)
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  • Jing Huang,

    1. Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380
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  • Dr. Limin Chen,

    Corresponding author
    1. College of Environment and Energy, South China University of Technology, Guangzhou 510006 (PR China)
    • Jinzhu Chen, Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380

      Limin Chen, College of Environment and Energy, South China University of Technology, Guangzhou 510006 (PR China)

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  • Prof. Dr. Longlong Ma,

    1. Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380
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  • Dr. Xing Huang

    1. Key Laboratory of Renewable Energy and Natural Gas Hydrate, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640 (PR China), Fax: (+86) 20-3722-3380
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Abstract

Cellulose and cellobiose were selectively converted into sorbitol over water-tolerant phosphotungstic acid (PTA)/metal– organic-framework-hybrid-supported ruthenium catalysts, Ru-PTA/MIL-100(Cr), under aqueous hydrogenation conditions. The goal was to investigate the relationship between the acid/metal balance of bifunctional catalysts Ru-PTA/MIL-100(Cr) and their performance in the catalytic conversion of cellulose and cellobiose into sugar alcohols. The control of the amount and strength of acid sites in the supported PTA/MIL-100(Cr) was achieved through the effective control of encapsulated-PTA loading in MIL-100(Cr). This design and preparation method led to an appropriately balanced Ru-PTA/MIL-100(Cr) in terms of Ru dispersion and hydrogenation capacity on the one hand, and acid site density of PTA/MIL-100(Cr) (responsible for acid-catalyzed hydrolysis) on the other hand. The ratio of acid site density to the number of Ru surface atoms (nA/nRu) of Ru-PTA/MIL-100(Cr) was used to monitor the balance between hydrogenation and hydrolysis functions; the optimum balance between the two catalytic functions, that is, 8.84<nA/nRu<12.90, achieves maximum conversion of cellulose and cellobiose into hexitols. Under the applied reaction conditions, optimal results (63.2 % yield in hexitols with a selectivity for sorbitol of 57.9 % at complete conversion of cellulose, and 97.1 % yield in hexitols with a selectivity for sorbitol of 95.1 % at complete conversion of cellobiose) were obtained using a Ru-PTA/MIL-100(Cr) catalyst with loadings of 3.2 wt % for Ru and 16.7 wt % for PTA. This research thus opens new perspectives for the rational design of acid/metal bifunctional catalysts for biomass conversion.

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