A Molten Salt Synthesis Method of the High-Entropy Alloy CrMnFeCoNi for High Catalytic Performance and Low Life Cycle GHG Emissions

Yasukazu Kobayashi, Heng Yi Teah, Shota Yokoyama, Ryo Shoji, Nobuko Hanada

Research output: Contribution to journalArticlepeer-review

Abstract

The high-entropy alloy (HEA) CrMnFeCoNi is a prominent catalyst material. High-specific-surface-area HEA powder can be chemically prepared via a conventional direct etching method or a molten salt synthesis method developed in our group. In this study, we compared the catalytic performance in the hydrogenation of p-nitrophenol using the HEA CrMnFeCoNi powders obtained from the etching method and the molten salt method. The results demonstrated a superior catalytic performance for the HEA prepared by the molten salt method at 800 °C. A structural analysis comprising X-ray diffraction, scanning electron microscopy/transmission electron microscopy with energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy revealed that the HEA CrMnFeCoNi prepared by the molten salt method is composed of a homogeneous HEA core covered by an active nickel-rich surface shell, which contributes to the superior catalytic performance. Furthermore, a life cycle GHG emissions assessment was conducted to compare the environmental performances of the two methods. The result showed that the molten salt method accounted for 121 kg CO2e/kg HEA production, which is 20% lower than that for the common etching method. Thus, the molten salt synthesis method is a promising option to industrialize HEA production.

Original languageEnglish
Pages (from-to)15046-15057
Number of pages12
JournalACS Sustainable Chemistry and Engineering
Volume10
Issue number46
DOIs
Publication statusPublished - 2022 Nov 21

Keywords

  • 4-Nitrophenol hydrogenation
  • CrMnFeCoNi
  • High-entropy alloys
  • Life cycle assessment
  • Molten salt synthesis

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

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