Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (10): 100102-100102.doi: 10.11889/j.0253-3219.2018.hjs.41.100102

• SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS • Previous Articles     Next Articles

Effects of alkalis on the catalytic performance of CoMn catalysts for Fischer-Tropsch to olefin reactions

YANG Ruoou1,2, SUN Fanfei2, ZHAO Ziang3, ZHAO Jingtai1, JIANG Zheng2   

  1. 1 School of Materials Science and Engineering, Shanghai University, Shanghai 201900, China;
    2 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Zhangjiang Campus, Shanghai 201204, China;
    3 Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:2018-04-03 Revised:2018-05-12 Online:2018-10-10 Published:2018-10-16
  • Supported by:
    Supported by Joint Fund of National Natural Science Foundation of China (No.U1732267), National Natural Science Foundation of China (No.91545101)

Abstract: [Background] Cobalt carbide (Co2C) has recently been reported to catalyze the Fischer-Tropsch to olefin (FTO) conversion of syngas with high selectivity. However, electronic state and coordination structure of cobalt carbide is limited by its complex reaction.[Purpose] This study aims to clarify the effect of alkalis of CoMn catalysts for FTO and understanding the atomic structure of cobalt carbide nanoparticles in the CoMn catalyst.[Methods] X-ray absorption fine structure (XAFS) experimental on beamline (BL14W1) of XAFS spectroscopy at the Shanghai Synchrotron Radiation Facility (SSRF) is conducted to explore the electronic state and coordination structure of cobalt carbide with the effects of alkalis.[Results] X-ray absorption near-edge structures (XANES) spectra indicts that Na, K acted as electronic donors to cobalt than Li. EXAFS spectra clarified show that the atomic structure of cobalt carbide nanoparticles.[Conclusion] The Na, K promoter had benefited the formation of the cobalt carbide in the evolution of the FTO catalysts.

Key words: Fischer-Tropsch to olefin, Co2C, Alkalis, X-ray absorption fine structure

CLC Number: 

  • TL99