原位漫反射红外光谱研究NO和NH_3在MnO_x/TiO_2催化材料上的吸附行为及反应机理  

The Adsorption Behavior and Reaction Mechanism of MnO_x/TiO_2 Catalytic Materials to NO and NH_3 by DRIFTS

作　　者：赫连一哲 马晓宇 崔素萍 万业强 HELIAN Yizhe;MA Xiaoyu;CUI Suping;WAN Yeqiang(The Key Laboratory of New Functional Materials of Ministry of Education,College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124)

机构地区：[1]北京工业大学材料科学与工程学院新型功能材料教育部重点实验室,北京100124

出　　处：《材料导报》2018年第22期3973-3978,共6页Materials Reports

基　　金：国家重点研发计划(2017YFB0310802);国家自然科学基金创新研究群体项目(51621003)

摘　　要：MnO_x/TiO_2催化材料在选择性催化还原过程中表现出了较好的低温催化活性,为了深入了解其作用机理,进一步改善催化活性,本工作采用原位漫反射红外光谱法系统地分析了NO和NH_3在MnO_x/TiO_2催化材料上的单吸附和共吸附行为。分析认为,该催化材料表面发生的选择性催化还原过程符合Eley-Ridal机理,催化反应发生在吸附态的NH_3和气态NO之间,而吸附态的NO及后续生成的硝酸盐、亚硝酸盐等物质会占据催化材料的活性位点,影响其对NH_3的吸附,进而导致脱硝活性下降。MnO x /TiO 2 catalysts has been shown excellent selective catalyst reduction （SCR） activity at low temperature.In order to understand its mechanism thoroughly and improve its catalytic activity further, in situ diffuse reflectance infrared spectroscopy （DRIFTS） was adopted to systematically analyze the single adsorption and coadsorption of NO and NH 3 on MnO x /TiO 2 catalytic materials. It is considered that the selective catalytic reduction process of the catalytic material conforms to the Eley-Ridal mechanism,and the reaction occurs between the adsorbed NH 3 and the gaseous NO,while the adsorbed NO and the produced azotate and nitrite will occupy the active site of the catalytic material,which affects the adsorption of NH 3 and leads to the decrease of the denitrification activity.

关 键 词：脱硝催化材料 酸解残渣 原位漫反射红外光谱 选择性催化还原 Eley-Ridal机理 

分 类 号：X511[环境科学与工程—环境工程]