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Indexed by:期刊论文

Date of Publication:2010-03-11

Journal:JOURNAL OF PHYSICAL CHEMISTRY C

Included Journals:SCIE、EI、Scopus

Volume:114

Issue:9

Page Number:3962-3967

ISSN No.:1932-7447

Abstract:Cobalt silicide nanoparticles ill mesoporous silica SBA-15 were Successfully prepared by metal-organic chemical vapor deposition of a single-source precursor and were characterized by nitrogen physorption, X-ray diffraction, temperature-programmed reduction, temperature-programmed desorption, and transmission electron microscopy. The catalytic hydrogenation of naphthalene oil the cobalt silicide nanoparticles in mesoporous silica was investigated ill a fixed-bed reactor at 340 degrees C Under 4.0 MPa hydrogen pressure. No cobalt silicide was observed in the mesoporous silica Without calcination because of the hydrolysis of Co(SiCl(3))(CO)(4). Highly dispersed and evenly distributed cobalt silicide particles with diameters of 2-4 nm Could be formed by adsorption and reduction of CO(SiCl(3))(CO)(4) in the mesoporous silica with calcination above 500 degrees C. The cobalt silicide loading in the mesoporous silica depended on both the amount of precursor provided and the amount of hydroxyl groups in the mesoporous Silica. A 8.3% CoSi/SBA-15 sample showed lower conversion and higher selectivity to tetralin (about 100%) in the naphthalene hydrogenation, while a 16.1% CoSi/SBA-15 sample showed a higher catalytic activity LIP 10 87% and a lower selectivity to tetralin (35%) than other CoSi/SBA-15 samples, which may be due to the size effect and the strong interaction of CoSi and Support.