CIESC Journal ›› 2018, Vol. 69 ›› Issue (5): 2073-2080.doi: 10.11949/j.issn.0438-1157.20180019

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Preparation of modified MgFeMn-HTLcs and catalytic performance in CO hydrogenation

ZHANG Jianli, WANG Xu, MA Liping, YU Xufei, MA Qingxiang, FAN Subing, ZHAO Tiansheng   

  1. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, Ningxia, China
  • Received:2018-01-08 Revised:2018-01-28
  • Supported by:

    supported by the National Natural Science Foundation of China (21666030) and the National First-rate Discipline Construction Project of Ningxia (Chemical Engineering and Technology, NXYLXK2017A04).

Abstract:

A series of MgFeMn-HTLcs (hydrotalcite-like compounds) precursors with different Mg/Fe/Mn molar ratios were prepared by coprecipitation-hydrothermal method, which were then calcined and modified with K impregnation to be used as catalysts for light olefin synthesis from CO hydrogenation. The catalysts were characterized by XRD, SEM, TG, N2 adsorption-desorption, H2-TPR and XPS techniques. The results showed that MgFeMn-HTLcs precursors had typical layered structures of hydrotalcite and reduced crystallinity by Mn addition. After calcination, MgO was only detected from Mg-Fe precursors whereas Mg2MnO4, MgO and MgFe2O4 were co-existed from Mg-Fe-Mn precursors. After CO hydrogenation, main phases were MgCO3 and FeCO3, accompanied by formation of FeO-MnO and little FexCy. Mn addition further promoted Fe dispersion and increased reduction from Fe2O3 to Fe3O4, compared to those of K/Mg-Fe catalysts. With Mn increase and its electron donating effect, binding energies of Fe 2p were shifted to lower values. In CO hydrogenation, all prepared K/Mg-Fe-Mn catalysts showed high activity and C2=-C4= selectivity. O/P value of 5.20 and C2=-C4= fraction of 43.03% were achieved with low methane selectivity over K/3Mg-1Fe-2Mn catalyst.

Key words: Fischer-Tropsch synthesis, precursors, catalyst, hydrocarbon distribution, light olefins, selectivity

CLC Number: 

  • O643

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