The origin of SO{sub 2} promotion of propane oxidation over Pt/Al{sub 2}O{sub 3} catalysts
- Univ. of Cambridge (United Kingdom). Dept. of Chemistry
- Ford Motor Co., Dearborn, MI (United States). Research Lab.
XAFS, XRD, and TEM measurements on dispersed Pt/Al{sub 2}O{sub 3} catalysts have elucidated the promotional effect of SO{sub 2} in propane oxidation over these systems. At low loadings (0.05 wt%), Pt/Al{sub 2}O{sub 3} catalysts initially contain small (<20 {angstrom}) stoichiometric {beta}-PtO{sub 2} particles. Catalyst sulfation is accompanied by reduction and concomitant sintering of these oxidic particles, resulting in metallic Pt clusters exhibiting similar structural and reactive properties to their counterparts formed at higher loading (9 wt%). The formation of stable SO{sub 4} species on both alumina support and on the Pt surface facilitates the dissociative chemisorption of propane onto both support and metal. Evidence is presented for the role of interfacial sulfate in the activation and subsequent oxidation of propane via a bifunctional mechanism.
- OSTI ID:
- 362066
- Journal Information:
- Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 2 Vol. 184; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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