Regulating SnO2 surface by metal oxides possessing redox or acidic properties: The importance of active O2−/O22− and acid sites for toluene deep oxidation

[Display omitted] •Doping SnO2 surface with redox or acidic nature improves toluene oxidation activity.•With the order of 1%Mn/SnO2 > 1%Co/SnO2 > 1%Cr/SnO2 > 1%Bi/SnO2 > 1%In/SnO2 > SnO2.•Surface active oxygen and acidic sites interaction controls the reaction activity.•Redox Cr, Co,...

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Published in:Applied catalysis. A, General General, 2020-09, Vol.605, p.117755, Article 117755
Main Authors: Guo, Yao, Zeng, Lanling, Xu, Xianglan, Liu, Yaqian, Liu, Yang, Fu, Xiongcong, Gao, Zezhou, Qian, Zijian, Xu, Junwei, Fang, Xiuzhong, Wang, Xiang
Format: Article
Language:English
Subjects:
Acidic oxides
Bismuth
Catalysts
Chromium
Doping
Metal oxides
Oxidation
SnO2-based catalysts
Surface acid sites
Surface modification
Surface O2- and O22- anions
Tin dioxide
Toluene
Toluene oxidation
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Summary:[Display omitted] •Doping SnO2 surface with redox or acidic nature improves toluene oxidation activity.•With the order of 1%Mn/SnO2 > 1%Co/SnO2 > 1%Cr/SnO2 > 1%Bi/SnO2 > 1%In/SnO2 > SnO2.•Surface active oxygen and acidic sites interaction controls the reaction activity.•Redox Cr, Co, Mn oxide doping enriches both kind of surface active sites.•Acidic In, Bi oxide doping enriches only surface acidic sites. To explore the surface doping effects of metal oxides possessing redox (Cr, Co, Mn) or acidic (In, Bi) properties on SnO2, SnO2 doped by different metal oxides has been designed. All the doping metal oxides disperse finely on the SnO2 support surface, which can improves the reaction activity, obeying the order of 1%Mn/SnO2 > 1%Co/SnO2 > 1%Cr/SnO2 > 1%Bi/SnO2 > 1%In/SnO2 > SnO2. By modifying SnO2 surface with Cr, Co and Mn oxides, both the active surface oxygen (O2− and O22−) and acid sites quantities have been significantly improved, thus resulting in remarkable activity increment. Whereas, by modifying SnO2 surface with In and Bi oxides, only the surface acid sites amount has been improved, hence having limited activity improvement effect. 1%Mn/SnO2 catalyst possesses considerable amount of both types of active sites, thus showing the optimal toluene deep oxidation activity in all the catalysts.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2020.117755