Hydrogen chemisorption on Pt/Al2O3: Dependence of hydrogen desorption behaviour on its surface concentration, on adsorption temperature and on surface water

被引：18

作者：

Ehwald, H

Leibnitz, U

机构：

[1] Inst. F. Angew. Chem. Berlin-A., 12484 Berlin

来源：

CATALYSIS LETTERS | 1996年 / 38卷 / 3-4期

关键词：

hydrogen; chemisorption; temperature programmed desorption; temperature programmed reduction; platinum catalyst; SUPPORTED PLATINUM CATALYSTS; REDUCTION; OXYGEN;

D O I：

10.1007/BF00806561

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 hydrogen chemisorption on Pt/Al2O3 was investigated by temperature programmed desorption. The activation energy of desorption strongly depends on the hydrogen surface coverage. The chemisorption process is shown to be activated. High temperature H-2 desorption (spilled-over hydrogen) is due to reoxidation of reduced parts of the carrier surface by water or -OH groups.

引用

页码：149 / 155

页数：7

共 29 条

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ANDERSON JR, 1985, INTRO CHARACTERIZATI, pCHR1

[2] THE DISTRIBUTION OF ACTIVATION-ENERGY FOR HYDROGEN DESORPTION OVER SILICA-SUPPORTED NICKEL-CATALYSTS DETERMINED FROM TEMPERATURE-PROGRAMMED DESORPTION SPECTRA [J].