Modifications of Pt/alumina combustion catalysts by barium addition .2. Properties of aged catalysts

被引：49

作者：

Labalme, V ^{[1
]}

Garbowski, E ^{[1
]}

Guilhaume, N ^{[1
]}

Primet, M ^{[1
]}

机构：

[1] UNIV LYON 1,LAB APPLICAT CHIM & ENVIRONM,UMR CNRS,F-69622 VILLEURBANNE,FRANCE

来源：

APPLIED CATALYSIS A-GENERAL | 1996年 / 138卷 / 01期

关键词：

catalytic combustion; ageing; thermostability; platinum; alumina; barium addition;

D O I：

10.1016/0926-860X(95)00248-0

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：

Resistance of platinum deposited onto alumina and barium modified alumina, towards ageing at 1200 degrees C has been studied experimentally in the catalytic combustion of butane. With pure alumina, ageing has a tremendous effect on both the surface area of the support and metal dispersion which induces severe loss of activity. High temperature calcination of Pt-Ba/Al2O3 samples leads to a solid state reaction leading first to BaO . Al2O3, then to BaO . 6Al(2)O(3). The latter phase is strongly heat resistant inhibiting alpha-Al2O3 transformation. Despite surface area preservation, platinum is not stabilised on this support: metallic dispersion is very low, as evidenced by the formation of very large particles. Unexpectedly, activity is enhanced on such sintered catalyst. Some hypothesis concerning active species have been proposed to explain this activity enhancement. It is suggested that some kind of mobile superficial oxygen atom may be responsible for the activity.

引用

页码：93 / 108

页数：16

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