摘要
选择性催化还原法(SCR)脱除NOx具有较高的效率,是目前工业中应用最广泛的工艺。催化还原NOx的反应过程相当复杂。概括了H2、CO、烃类、NH3和尿素等作为还原剂选择性催化还原氮氧化物的各种反应机理,详细论述了催化还原过程中形成的中间体,如亚硝基甲烷、烯醇式物质(CH2CH O)、NO2[NH4+]2、NOy、CxHyOzN、CxHyOz、NO+、NCO或CtHxOyNz等,并讨论了催化剂和载体表面上的氧空缺和活性中心对SCR的影响,展望了这一领域的研究方向。
Due to complexity of the reaction process, there exist arguments among different researchers on the mechanism for selective catalytic reduction （SCR） of NOx. This paper reviewed the mechanisms for SCR using different reducing agents, such as H2, CO, hydrocarbon, NH3 and （NH2）2CO, including the intermediates formed during SCR, such as CH3NO2, --CH2=CH--O-- , NO2[NH4^＋ 12, NOr, CxHyOzN, CxHrOz, NO^＋ , NCO and CtHxOyNz. Influence of oxygen vacancies and active sites on surface of the catalysts and supports on SCR results was discussed. Trends in this field were outlined, too.
出处
《工业催化》
CAS
2006年第1期40-45,共6页
Industrial Catalysis
关键词
氮氧化物
选择性催化还原
反应机理
NOx removal
selective catalystic reduction（SCR）
mechanism
