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Structure of the SO4 2−/TiO2 solid acid catalyst and its catalytic activity in cellulose acetylation

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Abstract

SO4 2−/TiO2 solid acid catalyst, a kind of green catalyst, was introduced as an alternative of sulfuric acid in the synthesis of cellulose acetate (CA). It has been investigated that SO4 2−/TiO2 presented prominent catalytic activity during this process. The degree of polymerization of CA obtained using SO4 2−/TiO2 catalyst was 1.7 times higher than that using H2SO4, which could influence the mechanical properties of CA considerably. In addition, the SO4 2−/TiO2 solid acid catalyst exhibited perfect reusability in the acetic acid system for cellulose acetylation, with traces of SO4 2− leached during the reaction confirmed by NH3-TPD. It was investigated by XRD that the polymorphic of catalyst transformed from amorphous TiO2 to anatase TiO2 with the increase of calcination temperature and prolongation of calcination time, improving the catalytic activity of SO4 2−/TiO2 solid acid catalyst. The higher crystallinity it had, the better catalytic activity the SO4 2−/TiO2 catalyst exhibited. However, due to the decomposition of SO4 2− on the catalyst surface, confirmed by TG-MS analysis, the catalytic activity of SO4 2−/TiO2 catalyst decreased sharply when the calcination temperature was above 550 °C. The structure of SO4 2−/TiO2 solid acid catalyst has been investigated by FT-IR, and it can be confirmed that the SO4 2− group was bidentate coordinated with TiO2.

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Acknowledgements

The authors gratefully acknowledge the financial support provided by Undergraduate Training Programs for Innovation and Entrepreneurship (X15024).

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  1. UNILAB, State Key Lab of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

    Chen Meng, Gui-Ping Cao, Xue-Kun Li, Yi-Zhen Yan, En-You Zhao, Lin-Yi Hou & Hua-Yi Shi

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Meng, C., Cao, GP., Li, XK. et al. Structure of the SO4 2−/TiO2 solid acid catalyst and its catalytic activity in cellulose acetylation. Reac Kinet Mech Cat 121, 719–734 (2017). https://doi.org/10.1007/s11144-017-1165-3

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