Effect of Reduction and Carburization Pretreatment on Iron Catalyst for Synthesis of Light Olefins from CO Hydrogenation

doi:10.1007/s40242-017-6316-6

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (4): 672-677.doi: 10.1007/s40242-017-6316-6

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Effect of Reduction and Carburization Pretreatment on Iron Catalyst for Synthesis of Light Olefins from CO Hydrogenation

AN Tong, DANG Dan, CHENG Yi

Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China

Received:2016-07-25 Revised:2016-09-09 Online:2017-08-01 Published:2016-10-17
Contact: CHENG Yi E-mail:yicheng@tsinghua.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China（No.21576151）.

Abstract

Abstract:

Effect of reduction and carburization pretreatment on iron catalyst for CO hydrogenation to light olefins was investigated. The bulk structure and surface composition of the catalysts during pretreatment were characterized by means of X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and high-resolution transmission electron microscopy(HRTEM). The results indicated that phase transformation of iron phases involved α-Fe₂O₃→Fe₃O₄ →α-Fe both in the bulk and on the surface layers in hydrogen atmosphere. However, α-Fe₂O₃ was firstly transformed to Fe₃C and then to Fe₅C₂ in CO atmosphere, while in syngas atmosphere directly to Fe₅C₂. As carburization pretreatment time was prolonged, the degree of carburization on the surface increased, and the increase degree of iron catalyst carburization in CO pretreatment was stronger than that in syngas pretreatment. It inferred that surface carbon species was more easily formed in syngas pretreatment instead of iron carbide in CO pretreatment. After hydrogen pretreatment, when the catalyst was reduced to a mixture of magnetite and metallic iron, the selectivity to light olefins was relatively low. Under the joint effects of the active sites from surface iron carbide and surface carbon layers blocking the active sites, longer CO pretreatment time resulted in higher methane selectivity and less light olefins. The selectivity to methane on H₂-pretreated catalyst was lower than that of CO-pretreated catalyst.

Key words: Light olefin, Fischer-Tropsch synthesis, CO hydrogenation, Iron catalyst, Pretreatment

AN Tong, DANG Dan, CHENG Yi. Effect of Reduction and Carburization Pretreatment on Iron Catalyst for Synthesis of Light Olefins from CO Hydrogenation[J]. Chemical Research in Chinese Universities, 2017, 33(4): 672-677.

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Effect of Reduction and Carburization Pretreatment on Iron Catalyst for Synthesis of Light Olefins from CO Hydrogenation

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