Cs-substituted tungstophosphoric acid salt supported on smesoporous silica

In this paper, we describe the characterization and catalytic properties of mesoporous silica supported Cs-substituted tungstophosphoric acid salt (Cs -TPA/MS) with improved dispersion of the active clusters compared to materi als described previously in the literature. In particular, transmission ele ctron micrographs and the activity results for a model alkylation reaction are presented as evidence for the enhanced dispersion and performance. In a ddition, we demonstrate improvements in the physical and thermal stability of these materials with Cs-substitution using various characterization tech niques. (C)2000 Elsevier Science B.V. All rights reserved.