Effects of preparation conditions on the CO methanation performance of Co-Mo carbide catalysts

Jae Min Kim, Sung Hyun Kim, Sung Youl Park, Seong Soo Kim, Seung Jae Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

We prepared activated charcoal-supported Co-Mo carbide catalysts to investigate the effects of solution pH and initial Co/Mo molar ratio. In the absence of Co, no Mo adsorption was observed at pH above the pHzpc of AC, whereas the introduction of Co at pH > 6 resulted in the co-precipitation of Mo and Co and facilitated Mo adsorption. CO conversions for CO methanation at 400 °C and 30 bar achieved over samples prepared at pH 3 were initially high but decreased with increasing reaction time, whereas CO conversions were maintained at >90% with increasing reaction time for samples prepared at pH > 6. XPS analysis of these high-performance catalysts revealed that the predominant state of surface Mo was Mo0 rather than Mo4+ and Mo6+. Catalysts with maximum methanation activity, i.e., those with the highest surface Mo0 content, were obtained at pH 7 and an initial Co/Mo molar ratio of 1.0.

Original languageEnglish
Article number115219
JournalChemical Engineering Science
Volume209
DOIs
Publication statusPublished - 2019 Dec 14

Keywords

  • Activated charcoal
  • Cobalt molybdenum carbide
  • Initial Co/Mo molar ratio
  • pH
  • Wet impregnation

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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