Abstract: The effect of different original composition of iron oxide in the precursor on the reduction performance of ammonia synthesis catalyst was studied by thermal analysis. The precursor phase composition of the catalyst produces an effect on reduction performance, which is similar with the effect on activity. In the case of two phase coexistence in the precursor, the reduction process of catalyst is divided into sequential stages with respect to phase, which obeys the competitive reduction mechanism. It results in slower reduction rate,higher reduction temperature and decreasing catalyst activity. The reduction performance of ammonia synthesis catalyst is consistent with its activity,the easier the catalyst reduction,the higher is the activity. The experimental results indicate that Fe1-xO based catalyst has the fastest reduction rate, the lowest reduction temperature and the highest activity among all the fused iron catalyst for ammonia synthesis.

摘要： 采用Shimadzu DT-40型热分析仪,研究了不同原始铁氧化物组成对氨合成熔铁催化剂的还原性能的影响。发现催化剂的还原性能和活性与母体相组成的关系具有相似的规律性。当母体中两种物相共存时,催化剂的还原过程是按物相分阶段依次进行的,其结果使还原速度变慢,还原温度升高,亦使还原后催化剂的活性降低。氨合成催化剂的还原性能与其活性具有一致性,愈易还原的催化剂,其活性亦愈高。研究结果表明,在熔铁催化剂中,Fe_(1-x)O基氨合成催化剂还原速度最快、还原温度最低,其活性亦最高。