NO Reduction on Cu-Based Model Catalysts Studied by in-situ IRAS

作     者：Wujun Huang Na Lin Xiuwen Xie Mingshu Chen Huilin Wan Wujun Huang;Na Lin;Xiuwen Xie;Mingshu Chen;Huilin Wan

作者机构：State Key Laboratory of Physical Chemistry of Solid SurfacesNational Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-EstersDepartment of ChemistryCollege of Chemistry and Chemical EngineeringXiamen UniversityXiamenFujian 361005China 

出 版 物：《Chinese Journal of Chemistry》 (中国化学（英文版）)

年 卷 期：2022年第40卷第11期

页      面：1267-1274页

核心收录：

学科分类：07[理学] 070304[理学-物理化学(含∶化学物理)] 0703[理学-化学] 

基　　金：This work was supported by the National Natural Science Foundation of China(21872110,21327901) the National Key Research and Development Program of China(2020YFB0606401). 

主　　题：Copper Nitrogen oxides IR spectroscopy Single-atom Cu^(+) TiO_(x)thin film 

摘      要：Cu-based catalyst has been widely used for catalytic reduction of NO.Well-defined TiO_(x)/Cu(110)films were prepared and investi-gated by in situ reflection absorption infrared spectroscopy(IRAS),Auger electron spectroscopy(AES)and low energy electron dif-fraction(LEED).A complex surface structure of Cu^(+)(-O-Ti-)-O-Cu^(δ+)/Cu(110)was proposed,in which the topmost surface Cu+is highly dispersed,isolated and fixed by the TiO_(x) layer.Such a single atom -like surface site appears a very narrow vco peak at 2130 cm^(-1),and is more stable upon both CO reduction and vacuum annealing than the Cu_(2)O/Cu(110).Such isolated Cu^(+)(-O-Ti-)site on TiO_(x)/Cu(110)is also fairly stable in NO+CO reaction,but the overall catalytic activity is slightly lower than that on the Cu(110)surface,indicating that the single-atom Cu^(+)(-O-Ti-)site is less efficient for NO+CO reaction at the examined conditions.The study provides useful infor-mation for the design and application of single-atom catalysts and understanding the nature of catalytically active centers.