Effect of La3+ Substituting Ba2+ on the Structure and Methane Combustion Activity of Ba1-xLaxMn3Al9O19-α Catalysts

Chem. J. Chinese Universities ›› 2005, Vol. 26 ›› Issue (11): 2103.

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Effect of La³⁺ Substituting Ba^²⁺ on the Structure and Methane Combustion Activity of Ba_1-xLa_xMn₃Al₉O_19-α Catalysts

XU Jin-Guang¹, TIAN Zhi-Jian², ZHANG Pei-Qing¹, QU Xiu-Hua¹, XU Yun-Peng², XU Zhu-Sheng², LIN Li-Wu^2,3

1. Institute of Applied Catalysis,Chemical and Biological College of Science and Technology,Yantai University,Yantai 264005,China;
2. Laboratory of Natural Gas Utilization and Applied Catalysis;
3. State Key Laboratory of Catalysis Basis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China

Received:2004-10-14 Online:2005-11-10 Published:2005-11-10

Abstract

Abstract: Mn-substituted hexaaluminate(Ba_1-xLa_xMn₃Al₉O_19-α) catalysts were prepared by hydrothermal synthesis based on hydrolysis of urea.Effect of La^3⁺ substituting Ba^{^2⁺} on phase compositions,structure,thermal stability and methane combustion activity was investigated.When x≥0.4,La₂(CO₃)₃ decomposed in the range of 530—580 ℃ to be converted into La₂O₃.La₂O₃ reacted with γ-Al₂O₃ to form LaAlO₃ perovskite phase in the temperature range of 800—900 ℃.BaAl₂O₄ spinel phase was suppressed due to the formation(of LaAlO)₃perovskite phase,and higher dispersing of Ba^{^2⁺} in the solid phase was maintained,which is(more favorable) for the formation of hexaaluminate phase.When(x<0.4),the BET specific surface areas(and methane) combustion activities of the Ba_1-xLa_xMn₃Al₉O_19-α catalysts decreased due to the formation of(BaAl₂O)₄(spinel phase).The hexaaluminate structure distorted to some extent when Ba^{^2⁺} were substituted with La^3⁺.(The larger) the distortion,the lower the thermal stability of the Ba_1-xLa_xMn₃Al₉O_19-α catalysts.The methane combustion activity of the Ba_1-xLa_xMn₃Al₉O_19-α catalysts varied with the change of x,and the(Ba_0.2La_0.8Mn₃Al₉O)_19-α((x=0.8)) catalyst showed the highest activity for methane combustion.

Key words: Methane, Catalytic combustion, Hexaaluminate, Hydrothermal synthesis, Urea

CLC Number:

O643

TrendMD:

XU Jin-Guang, TIAN Zhi-Jian, ZHANG Pei-Qing, QU Xiu-Hua, XU Yun-Peng, XU Zhu-Sheng, LIN Li-Wu. Effect of La³⁺ Substituting Ba^²⁺ on the Structure and Methane Combustion Activity of Ba_1-xLa_xMn₃Al₉O_19-α Catalysts[J]. Chem. J. Chinese Universities, 2005, 26(11): 2103.

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Effect of La³⁺ Substituting Ba^²⁺ on the Structure and Methane Combustion Activity of Ba_1-xLa_xMn₃Al₉O_19-α Catalysts

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