Reactivity of ethyl groups on a Sn/Pt(111) surface alloy

被引：10
|
作者：
Zhao, HB [1 ]
Koel, BE [1 ]
机构：
[1] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA
来源：
CATALYSIS LETTERS | 2005年 / 99卷 / 1-2期
关键词：
ethyl; H-atom; TPD; ethylene; hydrogen; ethane; Sn/Pt alloy; dehydrogenation;
D O I：
10.1007/s10562-004-0772-6
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：
In order to probe the thermal stability and reactivity of ethyl intermediates on Pt- Sn alloy catalysts, we have synthesized these species by reaction of H atoms with adsorbed ethylene on a (root3 x root3)R30degrees-Sn/Pt(111) surface alloy. Adsorbed ethyl groups are stable until 376 K where they react to evolve ethane, ethylene, and H-2. The activation energy for ethyl dehydrogenation is E-dehyd* = 97 kJ/mol, which is twice that reported on Pt(111). In addition, we place a lower limit of E-hydr* > 70 kJ/mol on the barrier to ethyl hydrogenation on this alloy.
引用
收藏
页码：27 / 32
页数：6
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