{gamma}-Al{sub 2}O{sub 3}-supported Pt catalysts with extremely high dispersions resulting from Pt-W interactions

Journal Article · Tue Feb 15 04:00:00 EST 2000 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1999.2739· OSTI ID:20017458

Alexeev, O S; Graham, G W; Shelef, M; Gates, B C

Supported bimetallic catalysts are used in large-scale applications, illustrated by naphtha reforming and simultaneous removal of CO, hydrocarbons, and NO from automobile exhaust. Conventional preparation methods give materials with relatively large metal particles and low concentrations of bimetallic structures, which are difficult to characterize structurally because of their nonuniformity. Organometallic compounds with preformed metal-metal bonds, in contrast, offer good opportunities for preparation of catalysts with maximized bimetallic interactions and well-defined, highly dispersed structures. The goal of the work described here was to investigate how supports other than MgO stabilize such highly dispersed bimetallic structures and how the nuclearity and composition of the bimetallic cluster precursor influence the catalyst structure and properties, including the Pt-W interactions. The authors report the preparation, characterization, and catalytic properties of {gamma}-Al{sub 2}O{sub 3} supported samples prepared from {l{underscore}brace}Pt[W(CO){sub 3}(C{sub 5}H{sub 5})]{sub 2}(PhCN){sub 2}{r{underscore}brace} and from {l{underscore}brace}Pt{sub 2}W{sub 2}(CO){sub 6}(C{sub 5}H{sub 5}){sub 2}(PPh{sub 3}){sub 2}{r{underscore}brace}.

• Research Organization: Univ. of California, Davis, CA (US)
• Sponsoring Organization: National Science Foundation; Ford Foundation; US Department of Energy
• DOE Contract Number: FG05-89ER45384; AC02-76CH00016
• OSTI ID: 20017458
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 190; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CHEMICAL PREPARATION
MICROSTRUCTURE
PLATINUM