期刊
APPLIED SURFACE SCIENCE
卷 280, 期 -, 页码 179-185出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2013.04.122
关键词
Ru-Ir/ZnO catalysts; Crotonaldehyde; Selective hydrogenation; Crotyl alcohol; Deactivation; Promoting effect
类别
资金
- National Science Foundation of China [21173194]
- Program for Changjiang Scholars and Innovative Research Team in Chinese Universities [IRT0980]
A series of ZnO supported Ru-Ir bimetal catalysts were prepared and tested for vapor-phase selective hydrogenation of crotonaldehyde. The addition of Ir could effectively promote the catalytic performance, especially the catalyst stability. A Ru-0.5Ir/ ZnO catalyst showed the highest activity (a conversion of 63.3%) and selectivity to crotyl alcohol (94.4%) after 30 h reaction. The enhanced stability was attributed to the modified electronic property of Ru by the formation of RuIr alloy as the X-ray photoelectron spectroscopy results showed charge transfer from Ru to Ir, as well as the weakened surface acidity in the Ru-Ir/ZnO catalyst as evidenced by NH3 temperature-programmed desorption technique. Besides, the deactivation of the catalysts was due to the strong chemisorption of CO on the metal surface via decarbonylation reaction and deposition of organic compounds on the catalyst surface, which was characterized by CO poisoning experiment, CO temperature-programmed desorption and temperature-programmed oxidation methods. (C) 2013 Elsevier B.V. All rights reserved.
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