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Chem. J. Chinese Universities ›› 2002, Vol. 23 ›› Issue (6): 1113.

• Articles • Previous Articles     Next Articles

Preparation and Structural Characterization of Highly Dispersed γ-Mo2N Supported on Alumina

MENG Ming1, FU Yi-Lu1, LIU Zhen-Lin1, JIANG Ming1, XIE Ya-Ning1, HU Tian-Dou2   

  1. 1. Department of Chemical Physics, University of Science and Technology of China, Hefei 230026,China;
    2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China
  • Received:2000-12-04 Online:2002-06-24 Published:2002-06-24

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Abstract: The nitrided Mo/Al2O3 catalysts were prepared by temperature programmed reaction between NH3 and MoO3/Al2O3. XRD and EXAFS methods were used for the structural characterization. The results of XRDshow that the molybdenum species in the supported samples exist as a dispersed MoO3 phase before nitriding. After nitriding, most of the molybdenum species were nitrided to form γ-Mo2N. The lower intensity of the radial structure functions of Mo Kedge and the smaller coordination number of Mo-Nshells accordingly indicate that the γ-Mo2Nin the supported samples possesses a high dispersion, the lower the loading of Mo, the higher the dispersion of γ-Mo2Non alumina. From the view of coordination distance, it is found that with the increase of dispersion of γ-Mo2N, the Mo-N distance is a little shortened, which may be resulted from the nano shortening phenomenum. The values of disorder factors show that the γ-Mo2N phase in the supported samples has big thermal and structural disorder extent, and with the increase of its dispersion, both the thermal and structural disorder factors increase.

Key words: Mo2N/Al2O3 Catalysts, Preparation, Structural Characterization, EXAFS

CLC Number: 

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