电子供体对Fe(Ⅱ)EDTA络合NOx产物还原的影响研究进展

Research Progress in Effects of Electronic Donors on Reduction of NOxComplexing-absorption Products by Fe(Ⅱ)EDTA

氮氧化物(NOx)因对环境和人体健康的潜在危害而成为重要的大气污染控制因子。络合吸收-还原技术利用金属螯合物提高NOx的气液传质效率,结合化学还原或生物还原实现络合吸收产物的循环再生,是经济的、可持续的NOx治理技术。Fe(Ⅱ)EDTA作为最常用的高效络合吸收剂,络合吸收产物的还原是限制性步骤,电子供体对还原过程有重要影响。文章阐述了络合吸收-还原的原理,主要针对还原过程的不同电子供体进行论述,探讨其还原机理、还原效果以及温度、pH等因素对不同电子供体还原产生的影响,并提出Fe(Ⅱ)EDTA络合吸收NOx技术的展望。

Nitrogen oxides(NOx) are the crucial air pollution control factors that incur potential hazards to the environment and human health. This paper reviewed thre complexing absorption-reduction technology, by which metal chelates are used to improve the gas-liquid mass transfer efficiency of NOx, combining chemical reduction or biological reduction to recycle the complexing absorption products, so it is an economical and sustainable NOxtreatment technology. On the other hand, Fe(Ⅱ)EDTA is the most commonly used efficient chemical absorbent, and the reduction of its complexing absorption products is a limiting step, while the electronic donor exerts an important influence on the reduction process. This paper elaborated on complexing absorption-reduction, focusing on the effects of different electronic donors on the reduction process in terms of reduction mechanism, reduction effectiveness and the influencing factors such as temperature, pH and others, and also proposed the technology of NOxcomplexing absorption by Fe(Ⅱ)EDTA in prospective.