稀燃NOx储存－还原催化剂*

NO_x 储存-还原（NSR）技术是最有前景的稀燃氮氧化物消除技术，自从日本丰田公司1996年首次提出NOx 储存还原这一概念后，一直受到研究者的广泛关注。本文综述了近十余年来NSR催化剂（PBA型、水滑石型、钙钛矿型）的研究进展，重点概述了目前比较公认的NO_x储存－还原的反应路径，以及NSR催化剂的失活机制，包括H₂O和CO₂的负面影响，热失活和硫中毒问题，最后展望了NO_x 储存还原技术未来的发展趋势。

NOx Storage-Reduction Catalysts Used for Lean-Burn NOx Removal

The NO_x storage and reduction (NSR) technology will be the most promising way to reduce the NO_x emission from lean-burn engines. Since the concept of NO_x storage and reduction was firstly proposed by Toyota Co. in 1996, the NSR catalysts have attracted much attention in environmental catalysis area. The main advances in different formulated NSR catalysts (PBA-type、hydrotalcite-type、perovskite-type) in the last decade are systematically reviewed in this paper. The emphases are put on the commonly recognized NO_x storage and reduction pathway and the NSR catalysts deactivation mechanism, including the negative effect of H₂O and CO₂, the thermal aging and SO₂ poisoning. At last, the developing tendency for NSR technology is proposed.Contents
1 PBA –type NSR catalysts
1.1 Precious metals
1.2 Storage components
1.3 Supports
2 Other materials and structures for NSR catalysts
3 Mechanisms of NO_x storage-reduction reaction
4 Deactivation of NSR catalysts
5 Problems and Outlook