Catalytic Activity of La 1-x Sr x CoO 3 (x＝0.20.8) Supported on Porous Mullite Fiber Ceramics for NO and CO

doi:10.3724/SP.J.1077.2007.00483

Abstract

Abstract:

Perovskite La _1-x Sr_xCoO₃ ( x=0.2,0.4,0.6,0.8) catalysts based on porous mullite fiber ceramic were prepared by a vacuum impregnation method. The samples were characterized by XRD, SEM and BET, respectively. The La(OH)₃ crystal phase was detected besides the perovskite structures in La_1-xSr_xCoO₃catalysts, and the La(OH)₃ peaks become sharp as x decreases. Tridimensional netshape of support and the good dispersing particles of catalysts based on support were detected by SEM. Specific surface area of La _1-xSr_xCoO₃ increases with the degree of substitution x of Sr for La via BET tests. Catalytic activity of La _1-x Sr _xCoO₃ catalysts prepared for CO+NO was tested. The results indicate that La _1-x Sr _x CoO ₃ catalysts have a best catalytic activity, when partial substitution of Sr for La reaches the optimal substitution fraction ( x=0.2).

Key words: La1-xSrxCoO3 perovskite catalyst, porous mullite fiber ceramics, support, catalytic activity

DUAN Bi-Lin,ZENG Ling-Ke,LI Xiu-Yan,LIU Ping-An,SHUI An-Ze,LIU Yan-Chun. Catalytic Activity of La _1-x Sr _x CoO ₃ (x＝0.20.8) Supported on Porous Mullite Fiber Ceramics for NO and CO[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00483.

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Catalytic Activity of La _1-x Sr _x CoO ₃ (x＝0.20.8) Supported on Porous Mullite Fiber Ceramics for NO and CO

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Catalytic Activity of La 1-x Sr x CoO 3 (x＝0.2&#61566;0.8) Supported on Porous Mullite Fiber Ceramics for NO and CO

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Catalytic Activity of La _1-x Sr _x CoO ₃ (x＝0.20.8) Supported on Porous Mullite Fiber Ceramics for NO and CO