Study on Rhodium Support Technologies for Three-way Catalyst

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  • 三元触媒のためのロジウムサポート材の研究
  • 3ゲン ショクバイ ノ タメノ ロジウム サポートザイ ノ ケンキュウ

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The effects of Rh support materials and their loading amount on catalyst performance were investigated. As a result, Zirconium-based oxide (ZrO2) showed better capability as a Rh support than alumina (Al2O3). Another finding was that the Rh dispersion rate in the washcoat is a key factor affecting the catalyst performance. The reasons for the superiority of ZrO2 to Al2O3 are deemed as follows: 1) Even after severe thermal aging, ZrO2 can retain single-nano-size Rh particles by the SMSI. 2) On the ZrO2 support, Rh is more probable to retain metal state than on the Al2O3 support.

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