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Simultaneous IR/kinetic study of supported platinum methanation catalysts

Conference · · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)
OSTI ID:6360847
The adsorption of CO in helium, the competitive adsorption of CO and H/sub 2/ and the reaction of CO with H/sub 2/ on silica-, silica/alumina-, alumina-, and titanium oxide-supported 1.3-2% platinum were monitored by IR spectroscopy and gas chromatographic analysis of the product gases. Under reaction conditions at 275/sup 0/C, chemisorbed CO was virtually not present on Pt/TiO/sub 2/, but was present on the other catalysts. Turnover frequencies for methanation were much lower on the silica-supported platinum than on the silica-alumina- or alumina-supported catalysts, and were highest on the titanium oxide catalyst, which probably had only a small fraction (0.12) of platinum atoms exposed. No correlation between turnover frequency and either the band intensity of linear or that of bridged carbon monoxide was detected. The results were consistent with the assumption of a small number of active platinum sites.
Research Organization:
Pennsylvania State Univ.
OSTI ID:
6360847
Report Number(s):
CONF-800303-
Conference Information:
Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 25:2
Country of Publication:
United States
Language:
English