期刊
JOURNAL OF CATALYSIS
卷 238, 期 1, 页码 214-220出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2005.12.002
关键词
nonoxidative direct methane coupling; photocatalyst; mesoporous silica materials; surface defect; NBOHC
Some pure silica materials, such as amorphous silica and mesoporous silica (MCM-41, FSM-16). were examined as photocatalysts for nonoxidative direct methane coupling around room temperature. It was confirmed that these materials exhibited photoactivity for the reaction around room temperature to produce mainly ethane and hydrogen, and that mesoporous silica, FSM-16, exhibited the highest activity among them. The photoactive sites on these pure silica materials were formed through dehydroxylation of the surface hydroxyl groups at high temperature (e.g., 1073 K) before the photoreaction. The linear relationship was obtained between the area intensity of the nonbridging oxygen hole center (NBOHC) band in diffuse-reflectance UV-visible spectra and the photoactivities in the nonoxidative direct methane coupling, showing that the NBOHCs, which would be generated together with the E' center, were the photoactive sites for this reaction. (c) 2005 Elsevier Inc. All rights reserved.
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