NOx Storage-Reduction Three-Way Catalyst with Improved Sulfur Tolerance |
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| Authors: | Hirata Hirohito Hachisuka Ichiro Ikeda Yasuo Tsuji Shinji Matsumoto Shin'ichi |
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| Affiliation: | (1) Material Engineering Div. III, Toyota Motor Corporation, 1200, Mishuku, Susono, Shizuoka, 410-1193, Japan;(2) Material Engineering Div. I, Toyota Motor Corporation, 1 Toyota-cho, Toyota, Aichi, 471-8571, Japan |
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| Abstract: | The NO
x
storage-reduction catalyst (NSR catalyst) is poisoned by SO2 caused by fuel sulfur, thus its activity is reduced. In order to improve the NSR catalyst, the sulfur poisoning phenomenon has been analyzed. Based on this result, we developed TiO2 and Rh/ZrO2 to promote the sulfur desorption. The developed catalyst has made remarkable progress in its sulfur tolerance, about 50% improvement in NO
x
purification performance compared with the conventional one. |
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| Keywords: | lean-burn engines NO
x
storage NO
x
reduction sulfur poisoning |
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