Journal
APPLIED CATALYSIS A-GENERAL
Volume 588, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2019.117283
Keywords
Solvent effect; Active radicals; Molecule probe method; Styrene epoxidation; Reaction mechanism
Categories
Funding
- National Natural Science Foundation of China [21671028, 21771027, 21805020]
- Natural Science Foundation of Chongqing [cstc2019jcyj-msxmX0312, cstc2019jcyj-msxmX0330]
- Postdoctoral Science Foundation of China [2018M643402]
- Chongqing Postdoctoral Science Special Foundation [XmT2018004]
- Fundamental Research Funds for the Central Universities [2019CDXYHG0013, 2019CDQYWL009]
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The nature of a solvent plays an important role in selectively catalytic oxidations, influencing the catalytic activity and product selectivity. Most work attribute such roles to the polarity, acidity/basicity, or coordination ability of the solvent. Here, we systematically investigated the generated active free radicals in five different organic solvents during the catalytic oxidation of styrene by H2O2. Cr-doped PKU-1 aluminoborate was selected as the heterogeneous catalyst in this system. The solvent effect was comprehensively understood along this perspective. Hydroxyl radicals ((OH)-O-center dot) were preferred to be formed in CH3CN and responsible for the formation of carbonyl compounds, while superoxide ion radicals (O-center dot(2)-) were favored in DMF and beneficial to the epoxide production. The function of Cr3+ was correlated with the solvent effect and a tentative mechanism pathway was proposed accordingly.
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