Effect of catalyst preparation method on ammonia decomposition reaction over Ru/MgO catalyst

Tadahiro Fujitani, Isao Nakamura, Yuta Hashiguchi, Shoichi Kanazawa, Atsushi Takahashi

Research output: Contribution to journalArticlepeer-review

Abstract

NH3 decomposition on Ru/MgO nanoparticles was strongly influenced by the pore structure of the MgO support. Specifically, MgO-supported Ru nanoparticles prepared from Ru hydroxide and hydromagnesite as catalyst precursors via deposition-precipitation (DP) and coprecipitation (CPT) methods exhibited high catalytic activity for NH3 decomposition. The mesopores of MgO of about 3-5 nm and highly dispersed Ru species improved the catalytic performance. The electronic modification of metal species by alkali promoter facilitated the recombinative desorption of H and N atoms. However, no high electron density of Ru species was detected by XPS measurements, suggesting that the enhancement of the NH3 decomposition activity by the preparation method was not due to the modification of the Ru electronic state but the improvement of the Ru dispersion. The reason for the high activity of the DP and CPT catalysts was both the effect of the diffusion of H2 by the mesopores and improvement of Ru dispersion.

Original languageEnglish
Pages (from-to)1186-1192
Number of pages7
JournalBulletin of the Chemical Society of Japan
Volume93
Issue number10
DOIs
Publication statusPublished - 2020 Oct

Keywords

  • NH decomposition
  • Ru/MgO catalyst
  • Support effect

ASJC Scopus subject areas

  • Chemistry(all)

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