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基于固体氧化物电解池(SOEC)的NO x电化学还原技术不使用还原剂,避免了还原剂泄露造成的二次污染,可省去庞大复杂的还原剂储存、转化系统,是燃烧后NO x污染物排放控制的潜在技术之一。本文较为详细地介绍了NO x还原SOEC反应器的工作原理、NO x转化电极材料、结构特点和电解池组堆方式,综述了基于SOEC的NO x电化学还原技术的发展现状,针对NO x电化学还原反应特性,总结NO x电化学还原的效率评价指标,提出电解催化电极层、多孔电解质、对称电极、NO x富集等反应器构型设计思路,并展望今后NO x电化学还原专用反应器的研发前景。
NO x electrochemical reduction technology based on solid oxide electrolyzer (SOEC) does not use reductant to avoid the secondary pollution caused by leakage of reducing agent, which can save the huge and complicated reducer storage and conversion system and is a post-combustion NO x One of the potential technologies for pollutant emission control. In this paper, the working principle of NO x reduction SOEC reactor, the material of NO x conversion electrode, the characteristics of the structure and the cell stack method are introduced in detail. The development of NO x electrochemical reduction technology based on SOEC is reviewed. Chemical reduction reaction characteristics, summarizes the evaluation index of the electrochemical reduction efficiency of NO x, and proposes the design of reactor configuration such as electrolysis electrode layer, porous electrolyte, symmetric electrode and NO x enrichment, and looks forward to the future reaction of NO x electrochemical reduction R & D prospects.