Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 84, Issue 3-4, Pages 552-562Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2008.05.011
Keywords
Sol-gel; Lanthanum oxide; Platinum on alumina; CO adsorption; Steam reforming of methane; Partial oxidation of methane
Funding
- FAPESP (Fundacao para o Amparo a Pesquisa do Estado de Sao Paulo)
- CNPq (Conselho Nacional de Desenvolvimento cientifico e Tecnologico)
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The effect of La2O3 content on the structural properties and catalytic behavior of Pt/xLa(2)O(3)-Al2O3 catalysts in steam reforming of methane and partial oxidation of methane was investigated. There was a decrease in the density of Pt sites with the increase of La2O3 loadings according to Fourier transform infrared spectroscopy of adsorbed CO and to dehydrogenation of cyclohexane results. However, transmission electron microscopy data indicates an opposite trend. This apparent disagreement could be due to the partial coverage of Pt sites by LaOx species. CH4 turnover rates and specific rates of steam reforming of methane increased for higher La2O3 loadings. The Pt/Al2O3 catalyst was strongly deactivated during partial oxidation of methane, while La2O3-containing catalysts exhibited higher stability. The increase of activity observed during the reactions was ascribed to the ability of the [LaPtxO]Pt-0-like species to promote the gasification of coke. This cleaning mechanism led to higher accessibility of the active sites to CH4. (C) 2008 Elsevier B.V. All rights reserved.
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