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Molybdovanadophosphoric Heteropolyacid-Catalyzed Aerobic Oxidation of Methacrolein: The Crucial Role of Ionic Liquid as a Modifier

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Abstract

[EMIM]PAV[X] (X = Ac, NO3, BF4) was synthesized by a facile method using imidazolium-based ionic liquids ([EMIM][X], X = Ac, NO3, BF4) as the modifying reagent. Characterization by FT-IR, XRD, SEM, TG/DTA, H2-TPR and XPS demonstrated that [EMIM]PAV[Ac] has uniform rod-like morphology, better redox property and higher amount of NH4+ composite, which therefore provides a high selectivity of 98% in the oxidative transformation of methacrolein (MAL) to methacrylic acid (MAA) as a catalyst. Theoretical calculations suggested the relatively strong H-bond basicity of C2−H in [EMIM][Ac] has a great positive influence on the structure and redox property of [EMIM]PAV[X] hybrids.

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Acknowledgements

The authors sincerely appreciate for the Financial support from National Science Foundation of China (U1704251 and 2176240), Zhengzhou High Level Talent Certificate (20180200052), and the PhD Scientific Research Foundation of Pingdingshan University (PXY-BSQD-2019003).

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Authors and Affiliations

  1. Pingdingshan University, Pingdingshan, 467000, People’s Republic of China

    Yun-Li Cao

  2. Beijing Key Laboratory of Ionic Liquids Clean Processes, CAS Key Laboratory of Green Processes and Engineering, State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China

    Yun-Li Cao, Lei Wang, Yin-Ge Bai, Rui-Yi Yan & Bao-Hua Xu

  3. Zhengzhou Institute of Emerging Industrial Technology, Zhengzhou, 450000, People’s Republic of China

    Bao-Hua Xu

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Cao, YL., Wang, L., Bai, YG. et al. Molybdovanadophosphoric Heteropolyacid-Catalyzed Aerobic Oxidation of Methacrolein: The Crucial Role of Ionic Liquid as a Modifier. Catal Lett 150, 1774–1785 (2020). https://doi.org/10.1007/s10562-019-03063-4

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