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Mechanistic Insight into Ethanol Dehydration over SAPO-34 Zeolite by Solid-state NMR Spectroscopy

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Abstract

The reaction mechanism of ethanol dehydration over SAPO-34 zeolite is investigated by using solid-state NMR spectroscopy. SAPO-34 zeolites with different Si contents are prepared and their acidities are characterized by NMR experiments. The higher content of stronger Brønsted acid sites is correlated to the higher Si content. The adsorption of ethanol on the Brønsted acid sites in SAPO-34 leads to the formation of frustrated Lewis pairs(FLPs). Surface ethoxy species is observed by the dehydration of the FLP sites at room temperature, which can be further converted into ethene products. The decomposing of diethyl ether over Brønsted acid sites is responsible for the formation of ethoxy species at higher reaction temperatures. Triethyloxonium ions are formed in the reaction. A plausible reaction mechanism is proposed for the dehydration of ethanol over SAPO-34.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos.22072165, U1932218, 21991092, 21733013, 21773296), the National Natural Science Foundation of China-Royal Society(No.22061130202), and the Project of the Youth Innovation Promotion Association of the Chinese Academy of Sciences(No.2021329).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, 430071, P. R. China

    Xue Zhou, Chao Wang, Yueying Chu, Qiang Wang, Jun Xu & Feng Deng

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  1. Xue Zhou
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  2. Chao Wang
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  3. Yueying Chu
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  4. Qiang Wang
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  6. Feng Deng
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Correspondence to Jun Xu or Feng Deng.

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Zhou, X., Wang, C., Chu, Y. et al. Mechanistic Insight into Ethanol Dehydration over SAPO-34 Zeolite by Solid-state NMR Spectroscopy. Chem. Res. Chin. Univ. 38, 155–160 (2022). https://doi.org/10.1007/s40242-022-1450-1

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