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以Fe2O3为原料,采用两种预处理方法制备了碳化铁催化剂.结果表明,直接在CO气氛下进行碳化处理,或者以H2预还原后再用CO进行碳化处理均可以制备出碳化铁催化剂.碳化温度是制备过程中的关键因素.对于Fe2O3样品,较适宜的碳化温度是350℃,而对于添加了K助剂的样品,只有经H2预还原处理后再于350℃用CO碳化处理4h才能将样品完全转化为Fe5C2.在CO加氢的评价实验中,碳化铁催化剂表现出很高的催化活性,生成的烃类产物中主要是饱和烷烃,未检测到乙烯的生成.而在K改性的催化剂上反应产物中烯烃的含量明显提高.
Fe2O3 as raw material, two kinds of pretreatment methods were used to prepare the iron carbide catalyst.The results show that the carbonized iron can be prepared directly by carbonization in CO atmosphere or carbon pretreatment with H2 before carbonation. The temperature is the key factor in the preparation process.For the Fe2O3 sample, the suitable carbonization temperature is 350 ℃, but for the samples with K additives, only H2 pre-reduction treatment and carbonization at 350 ℃ for 4h The sample completely converted to Fe5C2. In the CO hydrogenation evaluation experiment, the iron carbide catalyst showed a high catalytic activity, the resulting hydrocarbon products are mainly saturated alkanes, no ethylene was detected in the K-modified The olefin content of the reaction product on the catalyst is significantly increased.