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固体氧化物电解池NOx电化学还原技术
Electrochemical Reduction of NOx with Solid Oxide Electrolysis Cell
基于固体氧化物电解池(SOEC)的NOx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NOx污染物排放控制的潜在技术之一。本文较为详细地介绍了NOx还原SOEC反应器的工作原理、NOx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NOx电化学还原技术的发展现状,针对NOx电化学还原反应特性,总结NOx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、NOx富集等反应器构型设计思路,并展望今后NOx电化学还原专用反应器的研发前景。
Electrochemical reduction of NOx pollutant based on solid oxide electrolysis cells (SOEC) is one of the promising technologies for post-combustion NOx emission control. NOx can be splitted with electric current instead of reductants in SOEC. This technology can avoid the risk of secondary pollution due to the leakage of reductants and can effectively reduce the sub-system for reductant storage and conversion which is usually complicated and space consuming. The working principles of SOECs for NOx reduction, the NOx conversion electrode materials, the SOEC structure features and the construction of SOEC stacks are summarized in details. The state of art, the key issues and the forefront of research are reviewed. Considering the characteristics of the NOx decomposition reaction, the performance evaluation indexes of NOx electrochemical reduction cell are proposed. Several novel concepts for practical cell designing such as additional electro-catalyst layer, porous electrolyte, symmetrical electrodes and the NOx storage agent are illustrated. The potential developing direction for NOx electrochemical reduction in SOEC is discussed.
Contents
1 Introduction
2 NOx reduction on SOECs
2.1 Basic theory
2.2 Judgments of cell performance
3 NOx reduction electrode materials
3.1 Noble metal electrodes
3.2 Mixed oxide electrodes
3.3 Perovskite electrodes
4 Art of NOx electrolyzer designing
4.1 Different types of NOx electrolyzers
4.2 Electrochemical NOx reduction stacks
5 Prospect of NOx electrolyzer researching
5.1 Mechanism of NOx electrochemical reduction
5.2 Material research
5.3 Principles of NOx electrolyzer designing
solid oxide electrolysis cells(SOEC)
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