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Adsorption and migration of hydrogen on different surface sites of γ-Mo2N catalyst

被引：8
|
作者：
Zhang, YJ [1 ]
Li, YX
Li, C
Xin, Q
机构：
[1] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
[2] Univ Liverpool, Dept Chem, Leverhulme Ctr Innovat Catalysis, Liverpool L69 3BX, Merseyside, England
来源：
SPILLOVER AND MIGRATION OF SURFACE SPECIES ON CATALYSTS | 1997年 / 112卷
关键词：
D O I：
10.1016/S0167-2991(97)80869-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Temperature programmed desorption (TPD) and temperature programmed adsorption (TPA) techniques were applied to study the mobility and migration of hydrogen species on high surface area Mo nitride catalyst. It was found that there are two kinds of adsorption sites on gamma-Mo2N one with low adsorption energy and the other with high adsorption energy respectively, and the catalyst shows a higher adsorption capacity at higher adsorption temperatures. TPD and TPA results revealed that hydrogen adsorption-desorption on gamma-Mo2N depends strongly on temperature. The adsorbed hydrogen species exhibits such high mobility that hydrogen species migrate from sites with low adsorption energy to sites with high adsorption energy. The TPD results show that the hydrogen species can migrate between different surface states to maintain a dynamic equilibrium.
引用
收藏
页码：457 / 464
页数：8
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