<br>固体选择性催化还原（SSCR）技术综述：选择性催化还原技术的优秀优化,Catalysis Science & Technology

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固体选择性催化还原（SSCR）技术综述：选择性催化还原技术的优秀优化
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2025-01-06 , DOI: 10.1039/d4cy01045k
Zhihao Wei ₁ , Bin Guan ₁ , Zhongqi Zhuang ₁ , Junyan Chen ₁ , Lei Zhu ₁ , Zeren Ma ₁ , Xuehan Hu ₁ , Chenyu Zhu ₁ , Sikai Zhao ₁ , Kaiyou Shu ₁ , Hongtao Dang ₁ , Tiankui Zhu ₁ , Zhen Huang ₁

Affiliation

选择性催化还原（SCR）技术是实现柴油机污染物减排目标的主要措施之一，目前使用的NH_3-SCR尾气后处理技术系统均基于以液体尿素水溶液为还原剂的设计方案。但是，使用尿素水溶液作为还原剂的SCR系统在使用过程中存在一些问题，如还原剂冻结（−11°C）导致还原剂运输管道堵塞;尿素水溶液不完全水解不仅会在管道中形成结晶，还会导致尿素注入量与氨量存在一定误差（尿素热解水解生成氨），影响SCR系统的转化效率。尿素水溶液单位体积的有效氨含量低（17.3%），尿素水溶液需要在 1500–2500 km 处补充，不利于尿素水溶液的质量控制，难以保证 SCR 系统中氮氧化物（NOx）转化效果的一致性。由于尿素 SCR 技术存在许多无法克服的缺陷，国内外研究人员纷纷将研究重点转向 SSCR（固体 SCR）技术。固体选择性催化还原（SSCR）技术利用固体氨储存，在加热时直接释放氨气。与基于尿素的 SCR 相比，这种方法具有显着优势，解决了其固有的局限性。本文概述了 SCR 和 SSCR 技术，讨论了氮氧化物的形成、NH_3-SCR 机制以及尿素 SCR 和固体氨储存材料的工作原理。它还探讨了 SSCR 系统的发展，强调了它们在克服传统 SCR 方法所面临的挑战方面的潜力。

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Review on solid selective catalytic reduction (SSCR) technology: excellent optimization of selective catalytic reduction technology

Selective catalytic reduction (SCR) technology is one of the main measures to achieve the pollutant emission reduction target of diesel engines, and the NH₃-SCR exhaust gas aftertreatment technology systems used at present are all based on the design scheme using liquid urea aqueous solution as a reducing agent. However, the SCR system using urea aqueous solution as the reducing agent has some problems in the process of use, such as freezing of the reducing agent (−11 °C) resulting in blocking of the reducing agent transport pipeline; incomplete hydrolysis of urea aqueous solution will not only form crystallization in the pipeline, but also lead to a certain error between the amount of urea injection and the amount of ammonia (urea pyrolysis and hydrolysis to produce ammonia), which affects the conversion efficiency of SCR system. The effective ammonia content per unit volume of urea aqueous solution is low (17.3%), and urea aqueous solution needs to be supplemented at 1500–2500 km, which is not conducive to the quality control of urea aqueous solution, and it is difficult to ensure the consistency of nitrogen oxide (NOx) conversion effect in the SCR system. Because there are many insurmountable defects in urea SCR technology, researchers at home and abroad have turned their research focus to SSCR (solid SCR) technology. Solid selective catalytic reduction (SSCR) technology utilizes solid ammonia storage, releasing ammonia gas directly upon heating. This approach offers significant advantages over urea-based SCR, addressing its inherent limitations. This paper provides an overview of SCR and SSCR technologies, discusses the formation of nitrogen oxides, the NH₃-SCR mechanism, and the principles of operation for both urea SCR and solid ammonia storage materials. It also explores the development of SSCR systems, highlighting their potential to overcome the challenges faced by conventional SCR methods.

更新日期：2025-01-06

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