Controlling the phase transformations and performance of iron-based catalysts in the Fischer-Tropsch synthesis

doi:10.1016/S1872-2067(12)60562-2

Abstract

Abstract: The phase transformations of a series of iron-based models of the catalysts used in the Fischer-Tropsch synthesis (FTS) were controlled using a combination of deep reduction followed by partial carburization. The catalysts were pretreated under a variety of different conditions and their performance in the FTS subsequently tested in a fixed-bed reactor. The physiochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Mössbauer effect spectroscopy (MES), H₂ temperature-programmed desorption (TPD), and laser Raman spectroscopy (LRS) before and after the reaction. The results indicated that the catalysts consisted predominately of α-Fe particles following the H₂reduction. The size of the crystals and the stability of the catalysts increased with increasing reduction temperature. The carburization process mainly occurred on the surface of the α-Fe particles, and the rate of the carburization process could be effectively controlled using C₂H₄. Compared with the catalysts activated with H₂ or syngas, the catalysts initially activated with H₂ followed by C₂H₄ exhibited better performance in the FTS.

Key words: Fischer-Tropsch synthesis, Iron-based catalyst, Phase control, Reduction temperature, Reduction atmosphere

GAO Fangfang, WANG Hong, QING Ming, YANG Yong, LI Yongwang. Controlling the phase transformations and performance of iron-based catalysts in the Fischer-Tropsch synthesis[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60562-2.

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https://www.cjcatal.com/EN/Y2013/V34/I7/1312

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