REDUCTION OF PT/AL2O3 CATALYSTS - EFFECT OF HYDROGEN AND OF WATER AND HYDROCHLORIC-ACID VAPOR ON THE ACCESSIBILITY OF PLATINUM

被引：30

作者：

BARBIER, J

BAHLOUL, D

MARECOT, P

机构：

[1] Laboratoire de Catalyse en Chimie Organique, U.R.A. CNRS 350, Université de Poitiers, 86022 Poitiers

来源：

JOURNAL OF CATALYSIS | 1992年 / 137卷 / 02期

关键词：

D O I：

10.1016/0021-9517(92)90165-E

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 direct reduction by hydrogen, without precalcination, of Pt/Al2O3 activated by H2PtCl6 was studied on several series of catalysts with different metal and chloride loadings. It appears that H2O acts as a kinetic inhibitor of the reduction reaction but can also induce platinum sintering. HCl has no kinetic effect on the reduction but is able to increase the metallic accessibility. The higher the hydrogen pressure, the lower the platinum dispersion. The extent to which the metal is accessible is considered to be resultant of two parallel reactions, namely polymerization and reduction of partly reduced Pt2+ complexes. © 1992.

引用

页码：377 / 384

页数：8

共 23 条

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