Effect of Sr Introduced by Different Preparation Methods on LaCoO3 Perovskite for NOx Storage-Reduction Reaction

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Abstract In order to improve the NO_x removal efficiency of the LaCoO₃ perovskite, a series of Sr-introduced LaCoO₃ perovskites were prepared by three different methods of citrate acid complex method (CA), incipient impregnation method (IM) and mechanical blending method (MB). The corresponding samples were characterized by TEM, XRD and FT-IR techniques to carefully investigate the influence of different preparation methods on the structure and reactivity of the catalysts. The results show that Sr addition greatly increased the NO_x removal efficiency of the catalysts. As for the LSC-CA sample, a portion of the introduced Sr entered into the perovskite lattice so that the amount of surface SrCO₃ was less than the nominal value. The SrCO₃ grains in the LSC-MB sample had bigger sizes than those in the LSC-CA and LSC-IM samples, resulting in slower NO_x trapping and releasing rate. The LSC-IM sample had plenty of surface SrCO₃ with small grain size, which could easily trap NO_x and cooperate with the oxidation-reduction center. Therefore, among the three samples, the LSC-IM sample achieved the highest NO_x removal efficiency.

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	Articles by authors
	Guo Lihong
	Ding Quan
	Tian Ye
	Li Xingang

Keywords： NO_x； SrCO₃； citrate acid complex； incipient impregnation； mechanical blending

Received 2019-07-04;

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Guo Lihong, Ding Quan, Tian Ye, Li Xingang.Effect of Sr Introduced by Different Preparation Methods on LaCoO₃ Perovskite for NO_x Storage-Reduction Reaction[J] Chemcial Industry and Engineering, 2019,V36(6): 9-16

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