The study of structure-property relationships of heteropolyacids regulated by cesium sources in selective oxidation with methacrolein

Chen Li, Hong Zhang, Siyao Gu, Wenlong Lu, Xinyu Chen, Liuliu Zhong, Mingjun Zheng, Hui Wan, Lei Wang, Guofeng Guan

科研成果: 期刊稿件文献综述同行评审

摘要

The selective oxidation of methacrolein (MAL) to methacrylic acid (MAA) is a crucial step in the C4 process for producing methyl methacrylate (MMA). While Cs-modified polyoxometalates (POMs) are known to enhance the catalytic activity in this reaction, wherein the influence of different cesium sources on their performance remains unexplored. This work systematically investigates the effect of varying cesium sources on the performance of (NH4+)XCu0.2CsH2.8-XPMo11VO40 (BPAV) series catalysts. Characterization results show that the introduction of CsOH facilitates the formation of spherical microstructures in the catalyst, significantly increasing its specific surface area (13.74 m2/g) and medium acid amounts (1.46 mmol/g). XPS analysis further confirms that CsOH enhances the interaction between cesium ions and polyoxometalate anions, promoting the electron transfer from Cs ions to POM anions and the formation of abundant V4+ species (V4+/V5+ = 2.23) for enhanced redox capability. The BPAV catalyst with CsOH/POM molar ratio of 1 achieves the optimal performance, exhibiting 85.5 % MAL conversion and 90.5 % MAA selectivity. Furthermore, the BPAV catalyst with CsOH source also demonstrated excellent catalytic performance in the selective oxidation of propionaldehyde and isobutyraldehyde, with product selectivity surpassing 90 % in both reactions. These findings offer new insights and perspectives for the design of high-efficiency aldehyde oxidation catalysts.

源语言英语
页(从-至)495-503
页数9
期刊Chemical Engineering Research and Design
218
DOI
出版状态已出版 - 6月 2025

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