Studies on the Adsorption Property of No on the Ni-based MixedOxide Catalysts with Perovskite-like(ABO3 and A2BO4)Structure

Chem. J. Chinese Universities ›› 1996, Vol. 17 ›› Issue (5): 790.

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Studies on the Adsorption Property of No on the Ni-based MixedOxide Catalysts with Perovskite-like(ABO₃ and A₂BO₄)Structure

ZHAO Zhen, YANG Xiang-Guang, WANG Xue-Zhong, WU Yue

Changchun Institute of Applied Chemistry, Academic Sinica, Changchun 130022

Received:1995-06-06 Online:1996-05-24 Published:1996-05-24

Abstract

Abstract: The mixed oxides LaNiO₃, La_0.1Sr_0.9NiO₃, La₂NiO₄ and LaSrNiO₄ with perovskite(ABO₃)and related(A₂BO₄)structures were prepared and the adsorption property for NO and the catalytic activity for NO decomposition over these oxidse were also tested.The catalysts were characterized by means of BET surface measurement,chemical analysis, NO-TPDetc..It was shown that the adsorption amount of NO is correlated with the concentration of oxygen vacancy formed and the adsorption type and strength of NOare related to the valence of metallic ion.Generally there are three kinds of adsorption species, NO^-,NO⁺ and NO on the mixed oxides, among them the negative adsorpion species(NO^-)are active for NOdecomposition.The weaker the adsorption of oxygen on the catalyst is, the faster the mobility of oxygen is and the easier the redox process takes place in reproducing the active sites in which the oxygen species(O^-,O^2-)would participate.

Key words: Perovskite and related structure mixed oxides, Adsorption of NO, Oxygen vacancy, Valence of metal ion

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ZHAO Zhen, YANG Xiang-Guang, WANG Xue-Zhong, WU Yue. Studies on the Adsorption Property of No on the Ni-based MixedOxide Catalysts with Perovskite-like(ABO₃ and A₂BO₄)Structure[J]. Chem. J. Chinese Universities, 1996, 17(5): 790.

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Studies on the Adsorption Property of No on the Ni-based MixedOxide Catalysts with Perovskite-like(ABO₃ and A₂BO₄)Structure

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