Acta Phys. -Chim. Sin. ›› 2007, Vol. 23 ›› Issue (09): 1387-1392.doi: 10.3866/PKU.WHXB20070915

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Effect of Cu Doping on the Structure and Catalytic Activity of LaMnO3 Catalyst

BULGAN G.; TENG Fei; LIANG Shu-Hui; YAO Wen-Qing; ZHU Yong-Fa   

  1. Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
  • Received:2007-02-26 Revised:2007-05-14 Published:2007-09-06
  • Contact: ZHU Yong-Fa E-mail:zhuyf@tsinghua.edu.cn

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Abstract: La1-xCuxMnO3 (x=0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5) catalysts were synthesized by amorphous heteronuclear complexingmethod. The catalystswere characterized by XRD, TEM, andN2 adsorption isotherms. The cataluminescence (CTL) response to CO and the activities in the oxidation of CO and CH4 over the catalysts were investigated. XRD analysis indicated that the single-phase perovskite crystals were formed at x≤0.1, but perovskite and CuO phases coexisted at x>0.1. The catalytic activities of La1-xCuxMnO3 catalysts were superior to those of LaMnO3 catalysts for CO oxidation. La0.9Cu0.1MnO3 (calcined at 700 ℃ for 3 h) catalyst showed the highest catalytic activity for CO oxidation (T100%= 170 ℃), which agreed well with the cataluminescence results. However, La0.95Cu0.05MnO3 catalyst showed the highest catalytic activity for CH4 oxidation (T95%=705 ℃).

Key words: Amorphous heteronuclear complex, Perovskite, Catalyst, Cu dopant, Cataluminescence, CO, CH4