【摘要】 采用程序升温表面反应(TPSR)方法,研究了F-T合成铁-锰系催化剂于不同条件下吸附CO后,在催化剂表面形成的不同加氢活性碳物种的形态和反应性。结果表明,一氧化碳在铁基催化剂上解离后,可形成三类不同加氢活性的碳物种:表面碳(或其衍生的表面碳物种)、体相碳化物和非活性碳。其中,表面碳是形成甲烷及高级烃的表面活性中间物;体相碳化物可能是催化剂在反应条件下的真实活性相;而非活性碳则可能导致催化剂的失活。适量的锰、钾助剂对一氧化碳的解离及碳物种的形成起促进作用。更多还原

【Abstract】 The carbon species formed by the hydrogenation of adsorbed CO on the surface of Fe-Mn based catalysts were characterized with TPSR method. It was shown that 3 dif ferent types of hydrogenated carbon species were formed by the dissociation of CO on the surface with Fe based catalysts: surface carbon(or its derivatives), bulk carbon, and nonactive carbon. The surface carbon is the intermediate substance which can form methane and higher hydrocarbons; Bulk carbon may be the real reactive phase on thd cata lyst at reactive condition, and the nonactive carbon may cause the deactivation of catalyst. Mn and K additives of proper content promote the dissocation of CO and the formation of different carbon species.更多还原