期刊
APPLIED CATALYSIS A-GENERAL
卷 553, 期 -, 页码 117-125出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2018.01.005
关键词
Benzene; Hydroxylation; Phenol; Molecular oxygen; V-Zr catalyst
资金
- National Natural Science Foundation of China [21403136]
- Natural Science Basic Research Plan in Shaanxi Province of China [2016JQ2025]
- China Postdoctoral Science Foundation [2015M72514]
- Doctoral Scientific Research Foundation of Shaanxi University of Science Technology [BJ13-26]
Vanadium-zirconium catalyst was prepared with zirconium tetrachloride and ammonium metavanadate, which were supported on different supports, such as activated carbon, g-C3N4, MWCNTs (multiwall carbon nano tubes), acidified MWCNTs, bentonite, and gamma-Al2O3. Various techniques were employed to characterize the catalysts such as X-ray diffraction, X-ray photoelectron spectroscopy, nitrogen adsorption, and Raman spectrum. It was found that Zr4+ and V5+ in the vanadium-zirconium catalyst were dispersed on support in the form of zirconium pyrovanadate. The performance of catalysts on hydroxylation of benzene to phenol with O-2 as the oxidant was investigated. The vanadium-zirconium catalyst with different supports showed different catalytic performance and the reason was studied. It was found that the catalytic performance was related to the nature of the supports including the surface area and the composition of the supports. The yield of phenol reached to 8.6% and selectivity reached to about 80% when the activated carbon acted as support. Kinetic study showed that the first step of the consecutive reaction was first order for benzene and the second step was first order for phenol.
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