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Title: Effect of impregnation sequence on oxidation activity and desorption properties of Ag -Pd/Ce0.8Zr0.2O2 catalyst
Authors: Luo, Meng-fei
Yan, Zong-lan
Lin, Rui
Issue Date: Jun-2004
Publisher: NISCAIR-CSIR, India
IPC Code: B01J 21/06: B01J 23/07
Abstract: Ce0.8Zr0.2O2 supported Ag-Pd catalysts have been prepared by the impregnation method and characterized by ethanol-TPD, CO-TPD and XRD. The effect of different impregnation sequences on catalytic activity for ethanol and CO oxidation has been investigated. The experimental results show that impregnation sequence has definite effect on the activity for ethanol and CO oxidation. Catalytic activity for ethanol and CO oxidation follows the order: Ag -Pd/Ce0.8Zr0.2O2 > Ag-Pd(F)/ Ce0.8Zr0.2O2 > Ag(F)-Pd/ Ce0.8Zr0.2O2, and it corresponds with the temperature and intensity of the CO2 desorption peak in the CO-TPD process. Ethanol oxidation activity of the catalysts with different impregnation sequences correspond with the temperature and intensity of the desorption peak in ethanol-TPD process. XRD measurements show that there two Ag2O phases, cubic and hexagonal are observed for all catalysts. Only hexagonal Ag2O may favor the oxidation of ethanol or CO. Hexagonal Ag2O formed in the catalyst prepared by co-impregnation is the most active to react with ethanol or CO adsorbed on the surface of the catalyst.
Page(s): 1202-1205
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.43A(06) [June 2004]

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