Heterogeneous photochemical activation of H{sub 2}O photoreduction of Rh{sup I}(CO){sub 2} Al{sub 2}O{sub 3} by H{sub 2}

Journal Article · Wed Dec 20 04:00:00 EST 1995 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja00155a019· OSTI ID:223601

Wovchko, E A; Yates, Jr, J T ^[1]

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1. Univ. of Pittsburgh, PA (United States)

The UV (325 nm) photolysis of atomically-dispersed Rh{sup 1}(CO){sub 2} species supported on an Al{sub 2}O{sub 3} surface in the presence of H{sub 2} causes a reduction process producing Rh{sup 0}{sub x} surface species at 200 K. The Rh{sup 0}{sub x} sites are detected by means of the adsorption of characteristic chemisorbed CO species. The H-H bond is activated by the unstable and coordinatively unsaturated Rh{sup 1}CO surface intermediate generated during photodecomposition of Rh{sup 1}(CO){sub 2}. The results indicate that mobile Rh-containing surface species are produced photolytically from isolated Rh{sup 1} (CO){sub 2} and proceed to form Rh{sup 0}{sub x} clusters; this phenomenon offers a new method for the control of metal dispersion on supported catalysts. 48 refs., 5 figs.

• Sponsoring Organization: USDOE
• OSTI ID: 223601
• Journal Information: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 50 Vol. 117; ISSN JACSAT; ISSN 0002-7863
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
ALUMINIUM OXIDES
CARBONYLS
CATALYST SUPPORTS
CATALYSTS
CHEMICAL BONDS
DECOMPOSITION
HYDROGEN
INFRARED SPECTRA
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
REDUCTION
RHODIUM COMPOUNDS