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Preparation of palladium impregnated ceria by catalytic decomposition of metal complexes in methane steam reforming

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Document pages: 10 pages

Abstract: Palladium impregnated ceria materials were successfully prepared by the combination of metal complex decomposition method and microwave-assisted wet impregnation method. Firstly, CeO2 powder was prepared by thermal decomposition of cerium (III) complex with cerium (III) nitrate or cerium chloride (III) as metal source and triethanolamine or benzoxazine dimer as organic ligand. Therefore, while microwave radiation is applied to assist dopant dispersion, palladium (II) nitrate is introduced into the preformed ceria material using wet impregnation. The ceria material impregnated with palladium was characterized by   h obtained by calcining in He gas stream at 700 ° C for 2 hours in a reducing atmosphere (hydrogen content of 10 )he palladium-impregnated ceria materials reveals the influences of the metal complex precursors on the properties of the obtained materials. Interestingly, the palladium-impregnated ceria prepared from the cerium(III)-benzoxazine dimer complex revealed significantly higher BET specific surface area and higher content of the more active Pdδ+ (δ > 2) species than the materials prepared from cerium(III)-triethanolamine complexes. Consequently, it exhibited the most efficient catalytic activity in the methane steam reforming reaction. By optimization of the metal complex precursors, characteristics of the obtained palladium-impregnated ceria catalysts can be modified and hence influence the catalytic activity.

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