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Analysis of Poisoning Mechanism and Improvement of NOx Storage-Reduction 3-Way Catalyst

机译：中毒机理分析及NOx还原还原三效催化剂的改进

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摘要

Reduction of fuel consumption is the means for vehicles to reduce CO_2 emission as the environmental problem of the global scale. Lean-burn engines are effective in reducing fuel consumption, but reduction of NOx has been impossible with conventional catalysts. A new NOx storage-reduction 3-way catalyst based on a new mechanism that NOx is stored at oxidizing atomosphere and reduced it at near the stoichiometric air fuel ratio was put into practical use in 1994. This catalyst, however, is poisoned by SO_2 in the exhaust gas resulting from the sulfur content in the fuel, thus allowing the application only to limited environment. We have, therefore, analyzed degradation of this catalyst, and succeeded in improving the catalyst performance by improving the carrier and the loading method based on the analytical result.
机译：减少燃料消耗是车辆减少CO 2排放的手段，这是全球规模的环境问题。稀燃发动机在减少燃料消耗方面是有效的，但是使用传统催化剂不可能减少NOx。 1994年，一种新的NOx储存还原三效催化剂以一种新的机理为基础，该机理是将NOx储存在氧化性大气中，并在接近化学计量空燃比的情况下将其还原。该催化剂在2004年被SO_2毒化。由燃料中的硫含量产生的废气，因此仅适用于有限的环境。因此，我们已经分析了该催化剂的降解，并基于分析结果通过改进载体和负载方法成功地提高了催化剂性能。

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