Microcalorimetric study of the interaction of CO, O sub 2 , and CO + O sub 2 with Pt/SnO sub 2 and SnO sub 2 catalysts

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Journal of Catalysis; (USA)

DOI:https://doi.org/10.1016/0021-9517(90)90042-I· OSTI ID:5530224

Gangal, N D; Gupta, N M; Iyer, R M ^[1]

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1. Bhabha Atomic Research Centre, Bombay (India)

The heat evolved in the interaction of CO, O{sub 2}, and CO + O{sub 2} with SnO{sub 2} and Pt/SnO{sub 2} catalysts was evaluated at different temperatures in the range 300-475 K using microcalorimetry. The effect of oxygen and hydrogen pretreatments of the samples on the heat evolved shows that in the case of Pt/SnO{sub 2}, the values were higher for the oxidized sample as compared to the reduced sample whereas the trend was reversed for metal-free SnO{sub 2}. The thermochemical data reveal heterogeneity of CO or O{sub 2} adsorption/reaction sites and show that the heat evolved in interaction of a gas is considerably influenced by the chemical nature of the catalyst surface and by the present of preadsorbed species. The data support the view that the lattice oxygen abstraction from SnO{sub 2} plays an important role in CO oxidation at all the catalyst temperatures under study. The presence of platinum is found to augment Sn{sup 4+} {yields} Sn{sup 2+} conversion. It is suggested that the energy released in the chemisorption of carbon monoxide or oxygen over Pt gives rise to a localized temperature surge in the vicinity of metal sites and this additional source of energy leads to enhanced CO oxidation activity of Pt/SnO{sub 2} via accelerated lattice oxygen abstraction.

• OSTI ID: 5530224
• Journal Information: Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 126:1; ISSN 0021-9517; ISSN JCTLA
• Country of Publication: United States
• Language: English

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