Univ Sci & Technol China, Dept Phys Chem, Hefei 230026, Peoples R China
; Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
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 XRD show 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 gamma-Mo2N. The lower intensity of the radial structure functions of Mo K-edge and the smaller coordination number of Mo-N shells accordingly indicate that the gamma-Mo2N in the supported samples possesses a high dispersion, the lower the loading of Mo, the higher the dispersion of gamma-Mo2N on alumina. From the view of coordination distance, it is found that with the increase of dispersion of gamma-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 gamma-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.
Meng, M,Fu, YL,Liu, ZL,et al. Preparation and structural characterization of highly dispersed gamma-Mo2N supported on alumina[J]. CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,2002,23(6):1113-1116.
Meng, M.,Fu, YL.,Liu, ZL.,Jiang, M.,Xie, YN.,...&谢亚宁,胡天斗.(2002).Preparation and structural characterization of highly dispersed gamma-Mo2N supported on alumina.CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE,23(6),1113-1116.
Meng, M,et al."Preparation and structural characterization of highly dispersed gamma-Mo2N supported on alumina".CHEMICAL JOURNAL OF CHINESE UNIVERSITIES-CHINESE 23.6(2002):1113-1116.