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

页码：27 / 32

页数：6

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