碱金属盐对NH3选择性非催化还原NO的影响
郭啸峰; 魏小林; 李森
刊名工程热物理学报
2013-08-15
通讯作者邮箱xlwei@imech.ac.cn
卷号34期号:8页码:1591-1595
关键词碱金属 NH3 选择性非催化还原 详细化学反应机理
ISSN号0253-231X
其他题名Effect of Alkali Metal Salts on Selective Non-Catalytic Reduction of NO by NH3
通讯作者魏小林
产权排序中国科学院力学研究所高温气体动力学国家重点实验室
中文摘要本文研究碱金属元素Na和K对NH3选择性非催化还原NO的影响,并组建Na-K-H-O-N详细化学反应机理解释其影响机制。实验表明,碱金属盐将"温度窗口"向低温方向扩展,并在较大温度范围内增加脱氮效率,效果与碱金属盐的种类和碱金属原子浓度几乎无关,但钠盐的作用强于钾盐;高温下碱金属对脱氮的促进作用较小,高浓度碱金属的脱氮效率比低浓度时略高。路径分析显示,NH2对还原NO起重要作用,OH是促使NH2生成的关键,Na的加入有利于在低温下促进OH自由基的生成,其主要反应为NaOH+O2→NaO2+OH、NaOH+M→Na+OH+M和NaO+H2O→NaOH+OH。相同形式的含K反应由于较高的活化能和较低的温度指数,反应速率较低,对OH生成的促进作用有限。
英文摘要The effect of alkali metal elements Na and K on the selective non-catalytic reduction of NO by NH3 was studied, and a detailed mechanism containing Na-K-H-O-N elements was established to explain the effect. The experimental results show that alkali metal salts can extend the "temperature window" toward a lower temperature, enhance the efficiency of NOx removal within a large range of temperatures, and the promoting effect is not sensitive to the salt type and atom concentration of alkali metal; however, the effect of sodium is more obvious than that of potassium. Under high temperatures, the promoting effect is not obvious, and higher concentration of alkali metal can enhance it slightly. The reaction path analysis shows that NH2 is important for NO reduction, and OH is crucial for producing NH2. The Na additives are beneficial for OH production under low temperatures, and the main reactions are NaOH+O2 &rarr NaO2+OH, NaOH+M &rarr Na+OH+M, and NaO+H2O &rarr NaOH+OH. The K reactions of the same form with higher activation energy and lower temperature exponent have lower reaction rates; therefore, the promoting effect of potassium on OH production is limited.
学科主题化工流体力学
收录类别EI ; CSCD
资助信息国家自然科学基金资助项目(No.91130028;No.50776099)
原文出处http://www.cnki.net
语种中文
公开日期2013-09-02
内容类型期刊论文
源URL[http://dspace.imech.ac.cn/handle/311007/47402]  
专题力学研究所_高温气体动力学国家重点实验室
推荐引用方式
GB/T 7714
郭啸峰,魏小林,李森. 碱金属盐对NH3选择性非催化还原NO的影响[J]. 工程热物理学报,2013,34(8):1591-1595.
APA 郭啸峰,魏小林,&李森.(2013).碱金属盐对NH3选择性非催化还原NO的影响.工程热物理学报,34(8),1591-1595.
MLA 郭啸峰,et al."碱金属盐对NH3选择性非催化还原NO的影响".工程热物理学报 34.8(2013):1591-1595.
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