Effect of the Reduction Step on the Catalytic Performance of Pd–CeMO₂ Based Catalysts (M = Gd, Zr) for Propane Combustion

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• 作者：D. Lopez-Gonzalez ; J. Couble ; M. Aouine ; L. Massin ; P. Mascunan…
• 关键词：Mixed ionic electronic conductor ; Gadolinia doped ceria ; Ceria–zirconia ; Pd ; Propane combustion ; Reduction activation
• 刊名：Topics in Catalysis
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：59
• 期：17-18
• 页码：1638-1650
• 全文大小：2,965 KB
• 刊物主题：Catalysis; Physical Chemistry; Pharmacy; Industrial Chemistry/Chemical Engineering; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1572-9028
• 卷排序：59

文摘

The effect of a reduction step on the catalytic activity of Pd supported doped ceria catalysts was investigated for the propane combustion. Two different oxides based on ceria zirconia (CZ), as a reference three-way catalyst support, and Gadolinia doped ceria (GDC), a mixed ionic electronic conductor, have been used to support Pd nanoparticles. The samples were characterized by H₂–CO chemisorption, temperature programmed reduction, and XPS. In addition, the reduction step in H₂ was in situ observed by environmental transmission electron microscopy. It was found that the catalytic activity of Pd supported on ceria-based supports can be strongly promoted by a reduction step whereas it does not change on alumina. This effect was attributed, in particular on GDC, to the reduction of a surface interaction phase, Pd_xCeO_2−δ, which induces a re-dispersion of metallic Pd nanoparticles.