Issue 4, 2022

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2–MnOx composite oxides

Abstract

An efficient method for highly selective preparation of the high value-added benzyl alcohol (BOL) and benzaldehyde (BAL) from liquid-phase catalytic oxidation of toluene with molecular oxygen over CeO2–MnOx composite oxides in a solvent-free system has been successfully developed in this work. The results demonstrated that CeO2–MnOx composite oxides exhibited high selectivity to BOL and BAL, which benefited from the synergistic catalysis between Mn3+/Mn2+ and Ce4+/Ce3+ redox pairs. Under optimal reaction conditions, 6.9% toluene conversion with 64.4% selectivity to BOL and BAL and 96.8% total selectivity to BOL, BAL and benzoic acid (BAC) was achieved. The good stability of the CeO2–MnOx composite oxide catalyst was confirmed by a five-cycle experiment. The possible oxidation reaction mechanism for the catalytic aerobic oxidation of toluene over CeO2–MnOx was also suggested. This work may provide a new insight into highly selective preparation of aromatic alcohols and aldehydes from the selective aerobic oxidation of aromatic hydrocarbons employing low-cost CeO2–MnOx as an efficient and stable catalyst.

Graphical abstract: Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2–MnOx composite oxides

Article information

Article type
Paper
Submitted
08 Nov 2021
Accepted
15 Dec 2021
First published
17 Dec 2021

React. Chem. Eng., 2022,7, 898-907

Solvent-free liquid-phase selective catalytic oxidation of toluene to benzyl alcohol and benzaldehyde over CeO2–MnOx composite oxides

G. Chen, K. You, X. Gong, F. Zhao, Z. Chen and H. Luo, React. Chem. Eng., 2022, 7, 898 DOI: 10.1039/D1RE00488C

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