Polymetallic oxygen cluster intercalated expanded graphite for selective oxidation of methacrolein to methacrylic acid

•POMs were intercalated into the layer gap of expanded graphite.•Acidity and oxidability of POMs were greatly enhanced after being intercalated into the expanded graphite.•POMs intercalated expanded graphite showed excellent catalytic activity for oxidation of MAL to MAA. How to prepare efficient an...

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Bibliographic Details
Published in:Molecular catalysis 2023-08, Vol.547, p.113394, Article 113394
Main Authors: Zeng, Xiangjie, Chong, Yandong, Zhou, Lilong, Li, Zhengjie, Yin, Peng, Hu, Yongqi, Yun, Jimmy
Format: Article
Language:English
Subjects:
Expanded graphite
Methacrolein
Methacrylic acid
POMs
Selective oxidation
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Summary:•POMs were intercalated into the layer gap of expanded graphite.•Acidity and oxidability of POMs were greatly enhanced after being intercalated into the expanded graphite.•POMs intercalated expanded graphite showed excellent catalytic activity for oxidation of MAL to MAA. How to prepare efficient and stable supported POMs catalysts is the key to improve the catalytic efficiency of POMs. In this work Cs+ and Cu2+ doped phosphomolybdenum vanadium acid has been inserted into the crevice of expanded graphite for the catalytic oxidation of methacrolein to methacrylic acid. The supported POMs show excellent acidity and oxidability due to the good dispersion of POMs crystals and interactions between POMs and expanded graphite that expanded graphite can draw electrons from POMs. The catalytic activity has been improved for 8 times and methacrylic acid selectivity has been increased more than 20%. Unlike other supported POMs, expanded graphite supported POMs shows good catalytic stability. This work shows an easy way to prepared efficient supported POMs for catalytic oxidation. [Display omitted]
ISSN:2468-8231
2468-8231
DOI:10.1016/j.mcat.2023.113394