Design of a Practical Intelligent Catalyst

Noboru Sato; Hirohisa Tanaka; Isao Tan; Mari Uenishi; Nobuhiko Kajita; Masashi Taniguchi; Keiichi Narita; Mareo Kimura

doi:10.4271/2003-01-0813

2003-03-03

Design of a Practical Intelligent Catalyst 2003-01-0813

We have reported the innovation of “An Intelligent Catalyst” which has the function for self-regeneration of Pd realized through the solid solution and segregation of Pd in a perovskite crystal [1, 2, 3, 4 and 5].

We have looked for a design configuration for LaFePdO₃ perovskite in the washcoat by comparing single and double layer washcaots as well as different loading locations for precious metals in order to maximize the Intelligent Catalyst's function in the practical conditions. The catalysts were attached to an engine exhaust system and subjected to an accelerated aging. The bed temperature of the catalysts reached to 1050 °C. The performance of the catalysts was evaluated on the engine dynamometer.

Catalytic activity and long durability were improved by development of the washcoat configuration. The optimum design of the washcoat was double-layer with a tri-metal (Pt, Rh and Pd) system. The perovskite was located in the lower layer. This improved intelligent catalyst exhibits excellent activity under practical conditions and reduces the loading of precious metals through its function for self-regeneration.

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Design of a Practical Intelligent Catalyst 2003-01-0813

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