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

doi:10.1627/jpi.56.312

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 journal › Article › peer-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 language	English
Pages (from-to)	312-316
Number of pages	5
Journal	Journal of The Japan Petroleum Institute
Volume	56
Issue number	5
DOIs	https://doi.org/10.1627/jpi.56.312
Publication status	Published - 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

Access to Document

10.1627/jpi.56.312

Cite this

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title = "Preparation of Rh/CeO2 using supercritical CO2 and its catalytic application for automotive exhaust",

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.",

keywords = "Automotive catalyst, Ceria, Oxygen storage capacity, Rhodium ceria, Supercritical carbon dioxide",

author = "Taichi Shimizu and Masaki Ota and Yoshiyuki Sato and Hiroshi Inomata and Yoshinao Nakagawa and Tetsuya Nanba",

year = "2013",

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T1 - Preparation of Rh/CeO2 using supercritical CO2 and its catalytic application for automotive exhaust

AU - Shimizu, Taichi

AU - Ota, Masaki

AU - Sato, Yoshiyuki

AU - Inomata, Hiroshi

AU - Nakagawa, Yoshinao

AU - Nanba, Tetsuya

PY - 2013/12/3

Y1 - 2013/12/3

N2 - 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.

AB - 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.

KW - Automotive catalyst

KW - Ceria

KW - Oxygen storage capacity

KW - Rhodium ceria

KW - Supercritical carbon dioxide

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