期刊
JOURNAL OF CATALYSIS
卷 294, 期 -, 页码 199-206出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2012.07.020
关键词
Photodecomposition of methanol; TiO2 photocatalyst; N-doped TiO2; Pt metals deposited on TiO2
资金
- Grant OTKA [K 81517]
The photo-induced vapor-phase reaction of methanol was investigated on Pt metals deposited on pure and N-doped TiO2. Infrared spectroscopic measurements revealed that illumination of the CH3OH-TiO2 and CH3OH-M/TiO2 systems led to the conversion of adsorbed methoxy species into adsorbed formate. In the case of metal-promoted TiO2 catalysts CO bonded to the metals was also detected. Pure titania exhibited very little photoactivity, its efficiency, however, increased with the narrowing of its bandgap by N-doping, a feature attributed to the prevention of electron-hole recombination. Deposition of Pt metals on pure and N-doped TiO2 dramatically enhanced the extent of photoreaction of methanol even in visible light: hydrogen and methyl formate with selectivities of 83-90% were the major products. The most active metal was Pt followed by Pd, It, Rh, and Ru. The effect of metal was explained by a better separation of charge carriers induced by illumination and by enhanced electronic interaction between metal nanoparticles and TiO2. (C) 2012 Elsevier Inc. All rights reserved.
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