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Citation: ZHAI Yan-Qing, MENG Ming, CHEN Jiu-Ling, LI Yong-Dan. Influences of La³⁺ and Ba²⁺ as Mirror Plane Cations on Structure, Thermal Stability of Hexaaluminates and Its Catalytic Combustion Activity for Methane[J]. Chinese Journal of Applied Chemistry, ;2005, 22(3): 320-325. shu

Influences of La³⁺ and Ba²⁺ as Mirror Plane Cations on Structure, Thermal Stability of Hexaaluminates and Its Catalytic Combustion Activity for Methane

1.
Department of Catalysis Science and Technology, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072

Corresponding author: LI Yong-Dan,
Received Date: 12 May 2004
Available Online: 26 September 2004

The co-precipitation method was employed to prepare barium and lanthanum he xaaluminate catalysts AMn_xAl_12-xO₁₉(A=La or Ba)(x=0.5,1,2,3) for methane combustion.The influences of La³⁺ and Ba²⁺ as mirror plane cations on the structure and thermal stability of hexaa luminates and the catalytic activity for methane combustion over them were investigated by means of XRD,BET,TPR techniques.The results show that the hexa aluminates possessed MP and β-Al₂O₃ structures when La³⁺ and Ba²⁺ were taken as mirror plane cations.Taking La³⁺ as mirror plane cation can avoid decreasing the surface area of the catalysts,enhance the structural stability of the catalysts,increase the oxidation state of active component Mn,the catalytic activity is thus improved.The catalysts po ssess optimal catalytic activity as x is equal to 2.
- catalytic combustion of methane,
- hexaaluminate,
- lanthanum (Ⅲ),
- barium (Ⅱ)
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Influences of La3+ and Ba2+ as Mirror Plane Cations on Structure, Thermal Stability of Hexaaluminates and Its Catalytic Combustion Activity for Methane

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通讯作者: 陈斌, bchen63@163.com

Influences of La³⁺ and Ba²⁺ as Mirror Plane Cations on Structure, Thermal Stability of Hexaaluminates and Its Catalytic Combustion Activity for Methane