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Designing Pt nanoparticles supported on CeO2-Al2O3: Synthesis, characterization and catalytic properties in the steam reforming and partial oxidation of methane

Catalyst synthesized from Pt nanoparticles of uniform size (Pt-NPs) well dispersed on CeO2 -Al2 O3 supports shows high stability under methane oxyforming reactions. Platinum nanoparticles (Pt-NPs) of about 3nm were synthesized by colloidal methods and encapsulated in mesoporous Al2 O3 and CeO2 -Al2...

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Published in:Journal of catalysis 2010-12, Vol.276 (2), p.351-359
Main Authors: PRIETO, PJ. S, FERREIRA, A. P, HADDAD, P. S, ZANCHET, D, BUENO, J. M. C
Format: Article
Language:English
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Summary:Catalyst synthesized from Pt nanoparticles of uniform size (Pt-NPs) well dispersed on CeO2 -Al2 O3 supports shows high stability under methane oxyforming reactions. Platinum nanoparticles (Pt-NPs) of about 3nm were synthesized by colloidal methods and encapsulated in mesoporous Al2 O3 and CeO2 -Al2 O3 prepared by sol-gel method. A new strategy to synthesize Pt clusters of uniform size supported on mixed oxides was achieved, and the catalysts were characterized by Fourier transform infrared spectroscopy of adsorbed CO, transmission electron microscopy and X-ray absorption fine structure spectroscopy and tested in steam reforming of methane (SRM) and partial oxidation of methane (POM). Pt-NPs were well dispersed on the supports, and there was no significant modification of their size during calcination and under POM conditions. In the SRM, the CH4 turnover rate on the Pt-NPs/CeO2 -Al2 O3 catalyst was twice higher than the one on the Pt-NPs/Al2 O3 catalyst, despite their similar Pt-NP sizes. The use of colloidal Pt-NPs to produce nanocatalysts with similar particle size clearly pointed out the important role of the CeO2 in promoting the catalytic activity. [PUBLICATION ABSTRACT]
ISSN:0021-9517
1090-2694
DOI:10.1016/j.jcat.2010.09.025