Self-Regenerating Rh- and Pt-Based Perovskite Catalysts for Automotive-Emissions Control

✍ Scribed by Hirohisa Tanaka; Masashi Taniguchi; Mari Uenishi; Nobuhiko Kajita; Isao Tan; Yasuo Nishihata; Jun'ichiro Mizuki; Keiichi Narita; Mareo Kimura; Kimiyoshi Kaneko

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 240 KB
• Volume: 45
• Category: Article
• ISSN: 0044-8249
• DOI: 10.1002/anie.200503938

✦ Synopsis

Automotive catalysts deteriorate as a result of a decrease in the active surface area of the precious metals, this is caused by the growth of grains under the inherent redox environment of exhaust gases at high temperatures of up to 1000 8C. To compensate for this deterioration, conventional catalysts are loaded with an excess amount of precious metals, although this leads to over-consumption and supply problems. Selfregenerating catalysts, which suppress the grain growth of precious metals, have recently been successfully developed and are based on the repeated movement of the precious metals in and out of perovskite oxides between a solid solution and metallic nanoparticles during the natural changes in the redox conditions. [1] Herein, we report for the first time that this self-regenerating function is realizable in Pt and Rh, as well as in Pd.

It has been predicted that the demand for precious metals for automotive catalysts will increase, and that these metals will soon be in short supply as a result of the growth in the number of automobiles in China and India and the global [*] Dr.