Preparation of Rh/CeO2 using supercritical CO2 and its catalytic application for automotive exhaust

Taichi Shimizu, Masaki Ota, Yoshiyuki Sato, Hiroshi Inomata, Yoshinao Nakagawa, Tetsuya Nanba

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Rh/CeO2 catalysts were investigated for automotive catalysts prepared by a supercritical CO2 impregnation technique. Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM) were used for the analysis of the Rh loading, Rh structure, and the morphology of the particles, respectively. Results of TEM and XRD showed Rh particles are highly dispersed on CeO 2 surface, and Rh/CeO2 after calcination were prevented aggregation of CeO2. OSC of Rh/CeO2 prepared by supercritical impregnation method was higher than those of conventional catalysts. The catalytic tests for three way catalysts (TWC) showed high CO oxidation activity obtained using Rh/CeO2 prepared by supercritical impregnation. Thus, it was concluded that supercritical CO2 impregnation technique can improve OSC and TWC activity.

Original languageEnglish
Pages (from-to)312-316
Number of pages5
JournalJournal of The Japan Petroleum Institute
Volume56
Issue number5
DOIs
Publication statusPublished - 2013 Dec 3

Keywords

  • Automotive catalyst
  • Ceria
  • Oxygen storage capacity
  • Rhodium ceria
  • Supercritical carbon dioxide

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology

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