Review of state of the art technologies of selective catalytic reduction of NOx from diesel engine exhaust
Review of state of the art technologies of selective catalytic reduction of NOx from diesel engine exhaust
复制标题
选择性催化还原柴油机尾气中氮氧化物的最新技术综述
DOI：
10.1016/j.applthermaleng.2014.02.021
复制
发表时间：
2014-05-01
影响因子：
6.4
通讯作者：
Huang, Zhen
中科院分区：
文献类型：
--
作者：
Guan, Bin;Zhan, Reggie;Huang, Zhen
针对移动应用中的NOx的日益严格的排放法规，如美国2010年和欧盟VI，将要求使用强化的NOx还原后处理技术，如选择性催化还原(SCR)。由于要求更高的Deno(X)效率，最近许多工作都集中在SCR系统的优化上，以尽可能扩大有效的Deno(X)温度窗口，特别是在低温下，提高催化剂的耐用性，并降低Deno(X)系统的成本。综述了国内外SCR技术的最新进展，包括钒系、铜沸石(CuZ)和铁沸石(FeZ)系固体还原剂替代制氨技术，以及新型沸石小孔SCR催化剂。此外，还讨论了CuZ和FeZ组合SCR、被动式SCR、DOC+(DPF、SCR)的集成以及在DPF(以下简称SCRF)体系上涂覆SCR催化剂等高度优化的混合方法的进展。尽管SCR技术被认为是NOx后处理的主导技术，但其副作用如NH3和N2O也引起了人们的关注。已经制定了相关法规来解决这些问题。(C)2014爱思唯尔有限公司。保留所有权利。
Increasingly stringent emission legislations, such as US 2010 and Euro VI, for NOx in mobile applications will require the use of intensification of NOx reduction aftertreatment technologies, such as the selective catalytic reduction (SCR). Due to the required higher deNO(x) efficiency, a lot of efforts have recently been concentrated on the optimization of the SCR systems for broadening the active deNO(x) temperature window as widely as possible, especially at low temperatures, enhancing the catalysts durability, and reducing the cost of the deNO(x) system. This paper provides a comprehensive overview of the state-of-the-art SCR technologies, including the alternative ammonia generation from the solid reductants, Vanadium-based, Cu-zeolite (CuZ) and Fe-zeolite (FeZ) based, and the novel chabazite zeolite with small pore size SCR catalysts. Furthermore, the progresses of the highly optimized hybrid approaches, involving combined CuZ and FeZ SCR, passive SCR, integration of DOC + (DPF, SCR), as well as SCR catalyst coated on DPF (referred as SCRF hereinafter) systems are well discussed. Even though SCR technology is considered as the leading NOx aftertreatment technology, attentions have been paid to the adverse by-products, such as NH3 and N2O. Relevant regulations have been established to address the issues. (C) 2014 Elsevier Ltd. All rights reserved.