EFFECT OF THE ADDITION OF ALKALI-METALS ON THE METALLIC PHASE OF PT AL2O3 CATALYSTS/

Citation
Sr. Demiguel et al., EFFECT OF THE ADDITION OF ALKALI-METALS ON THE METALLIC PHASE OF PT AL2O3 CATALYSTS/, Catalysis letters, 32(3-4), 1995, pp. 281-291
Citations number
21
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
1011372X
Volume
32
Issue
3-4
Year of publication
1995
Pages
281 - 291
Database
ISI
SICI code
1011-372X(1995)32:3-4<281:EOTAOA>2.0.ZU;2-8
Abstract
The effect of the addition of alkali metals to Pt/Al2O3 catalysts for dehydrogenation of paraffins was studied. Results can be interpreted i n terms of different effects. Thus, the addition of alkali metals prod uces a poisoning of the acid sites of the alumina support and a modifi cation of the characteristics of the metallic phase. The latter effect involves not only an increase of the Pt particles size, but also an e lectronic modification of the metallic phase. These two effects are mo re marked with alkali metals with higher ionic radius, such as K.