Citation: WANG Zi-Qing, LIN Jian-Xin, WANG Rong, WEI Ke-Mei. Ru-Based Catalysts Supported on Perovskite Type BaZrO3 for Ammonia Synthesis[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(3): 493-499. doi: 10.3969/j.issn.1001-4861.2013.00.018
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The BaZrO3 material was synthesized by the citric acid method. A series of Ru/BaZrO3 catalyst samples were prepared using the above BaZrO3 calcined at different temperatures as the support. The support materials and catalyst samples were characterized by X-ray diffraction (XRD), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed desorption (CO2-TPD), N2 adsorption-desorption isotherms and scanning electron microscopy (SEM). The results show that the catalytic performance is greatly influenced by the calcination temperature of the BaZrO3 support. The highest catalytic activity for ammonia synthesis is obtained on the Ru-based catalyst with the support calcined at 750 ℃. The ammonia concentration of RBZ-750 can achieve to 9.12% under the condition of 425 ℃, 5 MPa and 10 000 h-1. The strong mental-support interaction and electron conductivity of the support may be the key factors for the high activity at low reaction temperature.
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