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Monolithic catalysts drive complete oxidation of mixed VOCs via acidic-site-mediated molecular activation
Muping Shen, Kui Niu, Wenxin Lan, Yanqin Luo, Changlin Cao*, Jiachang Zuo*, Yinye Chen, Qingrong Qian, Qinghua Chen*, Yongjin Luo*
https://doi.org/10.1016/j.cjsc.2026.101058
Pt/MFI; Acetone oxidation; Lewis acid site; Brønsted acid site; Monolithic catalyst
ABSTRACT
The acidic sites of catalyst serve as a crucial role in the degradation of volatile organic compounds (VOCs). However, due to the structural diversity of VOCs and the complexity of their chemical bonds, the respective roles of Brønsted acid site (BAS) and Lewis acid site (LAS) in molecular activation remain insufficiently understood. Here, Pt/MFI catalysts with tunable acidic sites were synthesized via simple regulation using rice husk derived Na-MFI. Their catalytic performances were evaluated for the oxidation of acetone, a representative VOC containing C–C, C=O, and C–H bonds. At 175 °C, the Pt/MFI(B+L) catalyst achieves a reaction rate of 0.59 μmol gcat−1 s−1 for acetone oxidation, outperforming most previous reported catalysts. In situ DRIFTS spectra indicate that the inert formate vibration peaks on LAS is weaker than that on BAS, suggesting that LAS facilitates the deep oxidation of intermediates. In the scale-up experiment, the honeycomb-ceramic supported Pt/MFI(B+L)/Al2O3 monolithic catalyst achieves complete degradation of mixed VOCs including acetone, styrene, and ethyl acetate below 250 °C and realizes the removal of 90% CO at 197 °C simultaneously. This work provides mechanistic insights into the role of acidic sites in the complete oxidation of mixed VOCs, and offers an avenue for the rational design of industrial catalysts.
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