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Toluene combustion on Pd and Pt catalysts supported on γ-Al2O3 and γ-Al2O3-Ce | Combustión de tolueno en catalizadores de pd y pt soportados en γ-Al2O3 y γ-Al2O3-Ce

AuthorsPadilla, J. M.; Ángel, G. del; Bertín, V.; Cortés-López, A. J.; García Fierro, José Luis ; Poisot, M.
KeywordsCatalizadores de Pt/γ-Al2O3-Ce
Catalizadores de Pd/γ-Al2O3-Ce
Combustión de tolueno
XPS de Pd y Pt
Depósito de carbón
Especies redox
Issue Date2013
PublisherAcademia Mexicana de Investigación y Docencia en Ingeniería Química A.C.
CitationRevista Mexicana de Ingenieria Quimica 12(1): 73-83 (2013)
AbstractThis work reports the study of the catalytic oxidation of toluene (1400 ppm) on Pd and Pt catalysts supported over alumina promoted with 1 and 10 wt% Ce. Catalysts were characterized by: physical adsorption N2 (BET), XRD, UV-VIS, FTIR of adsorbed pyridine, FTIR od the CO adsorption, XPS and TPO. The results showed a decrease in the number of acid sites with the loading of Ce in the catalyst. It was observed higher dispersion on Pd than on Pt catalysts. For Pt catalysts only Pt0 species was detected while in palladium catalysts Pd0 and Pd2+ species were observed. For both series of catalysts total combustion was reached on the catalysts containing 1% of Ce, Pt/ACe1, and Pd/ACe1 catalysts, at 300oC. For Pd catalysts the maximum in activity depended on the redox optimal ratio (Ce3+/ Ce4+, Pd0/ Pd2+) ant the activation time for the calalyst was important. The catalytic combustion of toluene on Pt was favored on reduced surface through a process of demethylation. The depot of carbon on catalyst decreased with Ce contents due to redox properties of the cerium oxide.
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