Preparation of highly active Co/SiO2 fischer-tropsch synthesis catalyst with chelating agents: effect of chelating agents on structure of co species during preparation steps

Takehisa Mochizuki, Naoto Koizumi, Yusuke Hamabe, Takeshi Hara, Hirotsugu Takizawa, Muneyoshi Yamada

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The preparation of Co/SiO2 Fischer-Tropsch synthesis catalysts with an aqueous Co nitrate solution modified with chelating agents (NTA and CyDTA) was studied. Diffuse reflectance FTIR measurements showed that both NTA and CyDTA complexes formed in the impregnating solution were preserved on the SiO2 surface. During the subsequent drying step, some of the NTA-Co2+ complex were decomposed, whereas the CyDTA-Co2+ complex was completely preserved. The combustion temperature was higher for the CyDTA-Co2+ complex than the NTA-Co2+ complex. The FTS activity of the NTA-modified catalyst was dependent on the calcination temperature. Higher FTS activities were obtained only when the catalyst was calcined above the combustion temperature of the NTA complex. Therefore, the interactions between the chelating agents, Co2+ and the SiO2 surface during the preparation steps is the crucial factor for the promotion effect of NTA.

Original languageEnglish
Pages (from-to)262-271
Number of pages10
JournalJournal of The Japan Petroleum Institute
Volume50
Issue number5
DOIs
Publication statusPublished - 2007

Keywords

  • Chelating agent
  • Cobalt catalyst
  • Cobalt silicate
  • Fischer-tropsch synthesis

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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