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  4. Preparation of La0.9RE0.1MnO3 Ultra-fine Particles Used for CH4 Oxidation

稀土学报(英文版), 2002, 20(5): 457-464.

刘源 1, , 郑海涛 2, , 刘全生 3, , 张通 4,

1.Department of Chemical Engineering, Inner Mongolia Polytechnic University, Huhehot 010062, China

2.Department of Chemical Engineering, Inner Mongolia Polytechnic University, Huhehot 010062, China

3.Department of Chemical Engineering, Inner Mongolia Polytechnic University, Huhehot 010062, China

4.Department of Chemical Engineering, Inner Mongolia Polytechnic University, Huhehot 010062, China

基金项目:   国家自然科学基金(29869001)  

Preparation of La0.9RE0.1MnO3 Ultra-fine Particles Used for CH4 Oxidation

Keywords： rare earths

A technique for preparing perovskite-type oxides was developed. By this technique, ultra-fine particles of La0.9RE0.1MnO3 (RE: Y, Ce, Pr, Sm, Gd,or Dy) with high surface area and single perovskite structure were prepared, and the series of La0.9RE0.1MnO3 catalysts were studied experimentally. The so prepared ultra-fine particles exhibites high catalytic activity for CH4 total oxidation. The ultra-fine particles of La0.9RE0.1MnO3 (except for La0.9Pr0.1MnO3) prepared by this method are thermally much more stable than LaMnO3. Of the La0.9RE0.1MnO3 series, La0.9Y0.1MnO3 is most thermally stable, and La0.9Y0.1MnO3 or La0.9Gd0.1MnO3 (varies with calcination temperature) exhibits the highest catalytic activity for total oxidation of methane. The specific surface area of La0.9Y0.1MnO3 calcined at 1000 ℃ reaches 14.9 m2*g-1, while the specific surface area of LaMnO3 calcined at the same temperature is only 1.8 m2*g-1.

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