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0．87-1．30s-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．
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 pre- pared 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 RuC13 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.
出处
《分子催化》
EI
CAS
CSCD
北大核心
2013年第6期530-538,共9页
Journal of Molecular Catalysis(China)
基金
Technology Support Program of China(2007BAE08B02)
Fujian Province Education Department Science and Technology project(JK2011005)
Natural Science Foundation of Fujian Province(2013J01038)
PetroChina Innovation Foundation(2013D-5006-0506)
关键词
钌
负载型催化剂
多相催化
共浸渍
转化频率
Ruthenium
supported catalysts
heterogeneous catalysis
co-impregnation
turnover frequency
