期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 393, 期 -, 页码 47-55出版社
ELSEVIER
DOI: 10.1016/j.molcata.2014.05.026
关键词
Mesoporous silica; Oxidative desulfurization; Mechanism; Surface silanol-mediated
资金
- National Nature Science Foundation of China (NSFC) [21303088]
- Natural Science Foundation of Tianjin [14JCYBJC20000]
- MOE Innovation Team of China [IRT13022, IRT13R30]
Ordered mesoporous silicas with structures of MCM-41, MCM-48 and SBA-15 were synthesized. Oxidative desulfurization activities of dibenzothiophene and 4,6-dimethyl dibenzothiophene on the mesoporous silicas were investigated using tert-butyl hydroperoxide as an oxidant. Textures and surface properties of the synthesized mesoporous silicas were studied by X-ray diffraction, N-2-sorption, FT-IR and NH3-temeprature programmed desorption. The results show that oxidative desulfurization catalytic activities increase with surface area and surface acidity of the mesoporous silicas. Oxidative desulfurization mechanism on MCM-41 was investigated by the addition of surface silanol inhibitor such as acetic acid, water and triethylolamine or silylation of surface silanol groups using trimethylchlorosilane. A hypothetical mechanism based on surface silanol-mediated oxidation desulfurization is proposed. Oxidative desulfurization activities for Mo catalysts supported on MCM-41 were also investigated to identify the difference in oxidative desulfurization mechanism between MoO3 catalysts and pure mesoporous silicas. (C) 2014 Elsevier B.V. All rights reserved.
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