化工进展 ›› 2022, Vol. 41 ›› Issue (1): 400-417.DOI: 10.16085/j.issn.1000-6613.2021-0295

• 资源与环境化工 • 上一篇    下一篇

被动NOx吸附剂在柴油车冷启动排放控制中的研究进展

潘柔杏1(), 于庆君1,2, 唐晓龙1,2(), 易红宏1,2, 高凤雨1,2, 赵顺征1,2, 周远松1,2, 刘媛媛1   

  1. 1.北京科技大学能源与环境工程学院,北京 100083
    2.工业典型污染物资源化处理北京市重点研究室,北京 100083
  • 收稿日期:2021-02-07 修回日期:2020-05-18 出版日期:2022-01-05 发布日期:2022-01-24
  • 通讯作者: 唐晓龙
  • 作者简介:潘柔杏(1996—),女,硕士研究生,研究方向为大气污染控制。E-mail:1159385056@qq.com
  • 基金资助:
    中央高校基本科研业务费(FRF-AT-20-12)

Research progress of passive NOx adsorbent in diesel vehicle for cold start emission control

PAN Rouxing1(), YU Qingjun1,2, TANG Xiaolong1,2(), YI Honghong1,2, GAO Fengyu1,2, ZHAO Shunzheng1,2, ZHOU Yuansong1,2, LIU Yuanyuan1   

  1. 1.School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China
    2.Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants,Beijing 100083,China
  • Received:2021-02-07 Revised:2020-05-18 Online:2022-01-05 Published:2022-01-24
  • Contact: TANG Xiaolong

摘要:

机动车尾气是氮氧化物(NOx)重要来源之一,常见柴油车尾气NOx处理技术对冷启动阶段NOx减排效果较差,被动NOx吸附剂(PNA)应运而生。PNA可低温吸附存储NOx、高温脱附释放NOx,释放的NOx经过下游NOx处理单元[选择性催化还原(SCR)或NOx储存还原(NSR)]被彻底净化。本文综述了近年来PNA材料在低温冷启动过程中净化NOx的研究进展,对不同类型PNA材料进行结构及性能比对,其中Pd/分子筛表现出良好的低温NOx吸附-脱附性能、抗硫性以及水热稳定性,成为PNA优选。深入讨论了Pd/分子筛存储NOx机制以及影响因素。此外,分析了PNA在低温吸附-脱附NOx中面临的问题并展望其前景,指出提高具有优异抗水性能的NOx吸附位点数量及Pd物种分散程度是开发高性能PNA的重要前提。

关键词: 被动NOx吸附剂, 冷启动, 吸附, 脱附, 影响因素

Abstract:

Vehicle exhaust is one of the most important sources of NOx emission. However, the common NOx reduction techniques of diesel vehicle exhaust have poor performance during the cold start, so passive NOx adsorbent (PNA) has been proposed. PNA can adsorb NOx at low temperature and desorb NOx at high temperature, then the released NOx is thoroughly purified by downstream NOx treatment unit, such as selective catalytic reduction (SCR) or storage reduction (NSR). This review summarizes the recent progress of PNA materials for NOx purification during cold start at low temperature, and compares the structure and properties of different types of PNA materials. Among them, Pd/zeolites show good NOx adsorption-desorption performance at low temperature, high sulfur resistance and hydrothermal stability. Further, Pd/zeolites are discussed in depth, including the NOx storage mechanism and the influence factors. Finally, the problems of PNA in the low-temperature adsorption-desorption of NOx are analyzed and the prospects are also outlooked. It is pointed out that increasing the number of NOx adsorption sites with excellent water resistance and the Pd species dispersion are the important prerequisites for the development of high-performance PNA.

Key words: passive NOx adsorbent, cold start (PNA), adsorption, desorption, influence factors

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