研究了Mo和Cu助剂对FeK/SiO2催化剂的性质及费托(F-T)合成性能的影响.采用N2物理吸附、H2程序升温还原、X射线衍射、穆斯堡尔谱和X射线光电子能谱技术对催化剂进行了表征.结果表明,Mo加入后与Fe产生了较强的相互作用,抑制了催化剂的还原和碳化;Cu助剂的加入促进了催化剂的还原和碳化;当Mo和Cu共同加入后,催化剂的还原和碳化行为与单独加入Cu助剂时相似.催化剂F-T合成性能在固定床上于280℃,1.5MPa,2 000h-1,H2/CO=2.0的合成气中测试.结果表明,Mo的加入降低了催化剂活性,但提高了重质烃(C5+)的选择性;Cu的添加提高了催化剂的活性,但对稳定C5+选择性作用不明显.Mo和Cu共同加入后,催化剂既表现出较为稳定的C5+选择性,同时其活性也没有降低.
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