PdO/Al2O3–(Ce1-X
Zr
X
)O2 catalysts: effect of the sol-gel support composition |
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| Authors: | Gabriela Pérez Osorio Sergio Fuentes Moyado Vitalii Petranovskii Andrey Simakov |
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| Affiliation: | (1) Posgrado en Física de Materiales, Centro de Investigación Científica y de Educatión Superior de Ensenada, B.C., (CICESE), Apdo. Postal 2732, Ensenada, B.C., México;(2) Departamento de Catálisis, Centro de Ciencias de la Materia Condensada, Universidad National Autónoma de México (UNAM), Apdo. Postal 2681, Ensenada, B. C., México |
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| Abstract: | The contribution of (Ce1-X
Zr
X
)O2 additives to alumina supports prepared by sol-gel and the catalytic properties of PdO/Al2O3–(Ce1-X
Zr
X
)O2 catalysts (~0.3 wt% Pd, ~5 wt% (Ce1-X
Zr
X
)O2) in CO oxidation was herein investigated. The addition of (Ce1-X
Zr
X
)O2 to the support enhanced the surface area and decreased the size of Al2O3 particles. The UV–Vis bands of PdO particles and Pd2+ ions indicate that zirconia in (Ce1-X
Zr
X
)O2 promotes palladium-support interactions by forming highly dispersed PdO particles. Temperature-programmed reduction (TPR)
in hydrogen revealed that ceria enhanced the redox capacity of the supports while zirconia lowered the reduction temperature
of palladium oxide species. The comprehensive study revealed that the Ce/Zr ratio was a key factor influencing the catalytic
activity of samples in CO oxidation, because palladium oxide-support interactions had a significant effect in changing of
the reducibility of samples. So, the PdO/Al2O3–(Ce0.5Zr0.5)O2 exhibited the highest catalytic activity. |
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| Keywords: | Pd oxide supported catalysts sol-gel alumina ceria– zirconia mixed oxides redox behavior CO oxidation |
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