Selective liquid‐phase oxidation of toluene with molecular oxygen catalyzed by Mn‐TiO2 under solvent‐free conditions

In this paper, we reported the preparation, characterization, and catalytic performance of TiO2 doped with Mn for the selective oxidation of toluene to benzyl alcohol and benzaldehyde without any solvent. The structure of the catalyst was determined by X‐ray diffraction (XRD), X‐ray photoelectron sp...

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Bibliographic Details
Published in:Canadian journal of chemical engineering 2023-07, Vol.101 (7), p.4118-4127
Main Authors: Zhou, Xingfa, Deng, Renjie, Zhang, Yingdi, Wang, Xulong, Zeng, Fangruo, Tian, Yao, Liu, Huajie
Format: Article
Language:English
Subjects:
Benzaldehyde
Benzyl alcohol
Catalysts
Liquid phase oxidation
Mn‐TiO2
Oxygen
Photoelectrons
selective oxidation
Solvents
Titanium dioxide
Toluene
X ray photoelectron spectroscopy
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Summary:In this paper, we reported the preparation, characterization, and catalytic performance of TiO2 doped with Mn for the selective oxidation of toluene to benzyl alcohol and benzaldehyde without any solvent. The structure of the catalyst was determined by X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), nitrogen adsorption–desorption analysis (Brunauer–Emmet–Teller [BET]), scanning electron microscope (SEM), transmission electron microscope (TEM), and mapping. The results demonstrated that the catalytic properties of Mn‐TiO2 were higher than those of pure Mn3O4 and TiO2. The effects of reaction temperature, reaction time, oxygen pressure, and the amount of catalyst were studied. Under the optimal conditions, Mn‐TiO2 could afford 6.4% toluene conversion at a combined benzyl alcohol/benzaldehyde selectivity of 58.6%. Moreover, the catalyst can be repeated in the experiment for five times without significant loss of activity. Possible reaction mechanism for the oxidation of toluene with molecular oxygen over 20Mn‐TiO2
ISSN:0008-4034
1939-019X
DOI:10.1002/cjce.24747