Abstract
Precipitated iron catalysts containing structural promoters were prepared and their Fischer–Tropsch synthesis (FTS) performance was tested under the same reaction condition. BET, XRD, H2-TPR, and MES were conducted to characterize the phases, structure, morphology, reducibility and carbonization characteristics of the catalysts. It was observed that the reduced catalysts under syngas(H2/CO = 5) promoted with Al/Zr generate more Fe5C2 phase than Si/Ti, which showed that Al/Zr promoted catalysts are more easily reduced than the Si/Ti promoted ones. Addition of Zr and Al promoters improved the reduction and carbonization process of iron-based FTS catalysts. FTS performance data showed that the addition of Al and Zr can increase the CO hydrogenation activity compared to Si and Ti. Moreover, these two promoted catalysts also exhibited excellent stability.
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