Catalytic combustion of benzene over γ-alumina supported chromium oxide catalysts

Authors:  Tao Xing, Haiqin Wan, Yun Shao, Yuxiang Han, Zhaoyi Xu, Shourong Zheng

Abstract:
The -alumina supported chromium oxide catalysts with Cr loadings varying from 1.7 to 13.6 wt.% were prepared by the impregnation method and characterized using N₂ adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis spectroscopy and Raman spectroscopy. Benzene combustion catalyzed by the catalysts was investigated. The results showed that chromia was well dispersed on the surface of γ-Al₂O₃ with a monolayer dispersion capacity of 7.5 wt.%. For the supported chromia catalyst with a Cr loading of 1.7 wt.%, only Cr⁶⁺ species were observed. Increasing Cr loading to 5.1 wt.% led to the presence of both Cr³⁺ and Cr⁶⁺ species. Catalytic benzene combustion over the catalysts was found to be strongly dependent on Cr loading amount. For supported chromia catalyst with a Cr loading of 8.5 wt.%, complete benzene combustion was achieved at 350 ^◦C which was substantially lower than the temperature for other catalysts, indicating that supported chromia catalyst at a near monolayer dispersion capacity exhibited the optimum catalytic behavior for benzene combustion.

Keywords:
γ-Alumina supported chromia catalyst
Catalytic combustion
Benzene
Monolayer dispersion

Published in: Applied catalysis A: General   (Volume 468, Pages 1-474, 5 November 2013)

Publisher: Elsevier  

ISSN Information: 0926-860X

Catalytic combustion of benzene over γ-alumina supported chromium oxide catalysts

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