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Lewis and Brønsted acids in super-acid catalyst SO42−/ZrO2–SiO2

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Abstract

Super-acid catalyst, SO4 2−/ZrO2–SiO2, with high zirconium loading was synthesized and the nature of the surface acid was investigated by FT-IR of pyridine adsorption. With the increasing ZrO2 content, the Lewis and Brønsted acid sites increased and reached the maximum when Zr/Si (molar ratio) = 1.3. The sample with Zr/Si = 1.3 showed the strongest IR adsorption band in the S=O stretching region (1,300–1,400 cm−1). Pyrosulfate and monosulfate species existed on the surface of the catalysts and the acidic strength could be enhanced by induction effect of their S=O groups. And there were two kinds of Brønsted acid sites on the surface of the catalysts.

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Acknowledgements

Financial support of this work by the Natural Science Foundation of China (NSFC, No.50772070) is gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China

    Yan Wang, Jinghong Ma, Dong Liang, Meimei Zhou, Fuxiang Li & Ruifeng Li

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  1. Yan Wang
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  2. Jinghong Ma
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  3. Dong Liang
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  4. Meimei Zhou
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  5. Fuxiang Li
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  6. Ruifeng Li
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Correspondence to Ruifeng Li.

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Wang, Y., Ma, J., Liang, D. et al. Lewis and Brønsted acids in super-acid catalyst SO42−/ZrO2–SiO2. J Mater Sci 44, 6736–6740 (2009). https://doi.org/10.1007/s10853-009-3603-8

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  • DOI: https://doi.org/10.1007/s10853-009-3603-8

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