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Effect of ceria–zirconia ratio on the interaction of CO with PdO/Al2O3–(Cex–Zr1−x)O2 catalysts prepared by sol–gel method |
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| Authors: | Gabriela Prez-Osorio Felipe Castilln Andrey Simakov Hugo Tiznado Francisco Zaera Sergio Fuentes |
| Affiliation: | aPosgrado en Física de Materiales, Centro de Investigación Científica y de Educación Superior de Ensenada, BC (CICESE), Apdo. Postal 2732, Ensenada, BC, Mexico bDepartamento de Catálisis, Centro de Ciencias de la Materia Condensada (CCMC UNAM), Apdo. Postal 2681, Ensenada, BC, Mexico cDepartment of Chemistry, University of California at Riverside (UCR), Riverside, CA 92521, USA |
| Abstract: | The current work is devoted to study of CO interaction with PdO/Al2O3–(Cex–Zr1?x)O2 catalysts. Ceria–zirconia–alumina supports with different Ce/Zr ratio were prepared by sol–gel technique. The FT-IR characterization of CO adsorbed at ?120 and 25 °C on oxidized and reduced samples revealed that Ce/Zr ratio modifies the surface properties of support and oxidation state of palladium. The catalyst with Ce/Zr molar ratio 0.5/0.5 was characterized with the highest ability to stabilize palladium in oxide state and the highest activity to oxidize CO. Redox treatment of catalysts improves their catalytic activity. |
| Keywords: | Palladium oxide Al2O3–(Cex–Zr1?x)O2 CO adsorption In situ FT-IR Catalytic CO oxidation |
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