【摘要】 通过钌的配合物前驱体和硝酸钡的共浸渍制备的Ru+Ba+K/AC催化剂氨合成转化效率高,其氨合成转化频率在0.87~1.30 s-1之间,与氯化钌制备的Ru/AC催化剂相比,其转化频率提高幅度在26%~88%.共浸渍法制备的催化剂氨合成转化效率高,其主要原因可能是共浸渍法制备的催化剂钌粒子粒径分布区间较窄,易形成更多的活性位;钌表面氢的吸附受到抑制,氮更易活化,因而催化效率更高.更多还原

【Abstract】 Ru+Ba+K/AC catalysts with high turnover frequency were synthesized by co-impregnation with Ba(NO3)2 and the complex compound of glycerol and K2RuO4. The turnover frequency of the prepared catalysts is between 0. 87 and 1. 30 s-1,which is 1. 26 to 1. 88 times higher than that of the Ru/AC catalyst with RuCl3 as a precursor for ammonia synthesis. The higher turnover frequency of the Ru+Ba+K/AC catalysts than the Ru/AC catalyst could be attributed to the higher absorption and lower activation energy of nitrogen on the Ru surface and the narrow-sized distribution of Ru nanocrystals at the reaction temperature.更多还原