Effects of Pressure and Temperature in Hydrothermal Preparation of MoS2 Catalyst for Methanation Reaction

Jae Myeong Choi, Sung Hyun Kim, Seung Jae Lee, Seong Soo Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Abstract: Unsupported MoS2 catalysts were prepared for the methanation reaction by varying the pressure and temperature in the hydrothermal reaction by using ammonium tetrathiomolybdate (ATTM). The physical and chemical characteristics of the catalysts were analyzed by using XRD, SEM, TEM, BET, XPS, H2-TPR, and CO-TPD techniques. The catalyst particles were formed in the bent fringe shape by stacking the (0 0 2) planes, and consisted mostly of MoS2, with some Mo2S5 and MoS3. It was found that the BET surface and active sites such as surface Mo4+ and sulfur vacancies increased with increasing preparation pressure, which could contribute to the improvement of MoS2 catalytic activity. The increase in preparation temperature not only favored the decomposition of ATTM into MoS2, but also lowered the number of active sites accessible for the reaction. Thus, it was suggested that the preparation temperature should be controlled at 350 °C to improve the catalytic activity. Graphical Abstract: [Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)1803-1814
Number of pages12
JournalCatalysis Letters
Volume148
Issue number7
DOIs
Publication statusPublished - 2018 Jul 1

Keywords

  • Catalytic activity
  • Hydrothermal reaction
  • MoS
  • Pressure
  • Temperature

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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