Cobalt aluminate modified alumina as a carrier for cobalt in Fischer Tropsch synthesis

Title : Cobalt aluminate modified alumina as a carrier for cobalt in Fischer Tropsch synthesis

Abstract:

Fischer-Tropsch is an important technology for the efficient use of energy such as coal, natural gas and biomass?which  can  convert  syngas  into  high  value-added  chemicals.  Co-based  catalysts  are  promising  Fischer- Tropsch synthesis industrial catalysts due to their excellent carbon growth ability and low water vapor shift reaction. In order to improve the performance of Co-based catalysts, it is necessary to conduct a comprehensive and in-depth study and exploration of its Fischer-Tropsch synthesis mechanism. Modified alumina carriers were obtained by pre- coating  cobalt  aluminate  on  the  surface  of  common  alumina.  Next,  supported  cobalt  catalysts  were  obtained  by incipient  wetness  impregnation,  and  their  FTS  performances  were  evaluated  in  a  fixed-bed  reactor.  In  situ  XRD results  suggested  that  HCP  Co  was  obtained  after  reducing  the  aluminate-modified  alumina-supported  cobalt catalysts, as opposed to FCC Co, which was supported on common alumina. H2-TPR results demonstrated that the modified catalysts possessed lower reduction temperatures. CO-TPD and in situ CO-FTIR characterizations indicated that bridged rather than linear CO adsorption occurred on the modified catalysts. 

The evaluation results indicated that the aluminate-modified catalysts possessed higher CO conversion rates, higher C5 selectivity, higher cobalt specific activity, higher C5+ space-time yields (STYs), and lower methane selectivity than conventional catalysts in the FTS process.

Biography:

Liu Yan, Ph.D., Industrial Catalysis, Assistant Research Fellow, Shanxi Institute of Coal Chemistry, Chinese Academy of Sciences, is mainly engaged in the research and development of new Fischer-Tropsch synthesis catalysts and supporting technologies. He has published 21 academic papers and obtained 17 authorized patents.