The detailed kinetics of the desorption of hydrogen from polycrystalline copper catalysts

被引：35

作者：

Tabatabaei, J

Sakakini, BH

Watson, MJ

Waugh, KC

机构：

[1] UMIST, Dept Chem, Manchester M60 1QD, Lancs, England

[2] ICI Katalco RT&E, Billingham, Cleveland, England

来源：

CATALYSIS LETTERS | 1999年 / 59卷 / 2-4期

关键词：

hydrogen; desorption; copper; activation energy; kinetics; order of desorption;

D O I：

10.1023/A:1019080823616

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：

The kinetics of desorption of hydrogen from the copper component of an alumina-supported polycrystalline copper catalyst has been studied in detail by temperature-programmed desorption (TPD). Line-shape analysis of the hydrogen TPD spectra shows: (i) that the desorption is second order, (ii) that the desorption activation energy is in the range 64-68 kJ mol(-1) in the coverage range 7-44% of a monolayer, and (iii) that the desorption pre-exponential term has a value similar to 10(-5) cm(2) s(-1) atom(-1) consistent with the desorption being second order, involving mobile adsorbates and a mobile desorption transition state.

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页码：143 / 149

页数：7

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