Sol-gel synthesis of CuO-TiO2 catalyst with high dispersion CuO species for selective catalytic oxidation of NO

被引:87
作者
Zeng, Yiqing [1 ]
Wang, Tianxiao [1 ]
Zhang, Shule [1 ]
Wang, Yanan [1 ]
Zhong, Qin [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
CuO-TiO2; mixed-oxide; Dispersion; Strong interaction; Active oxygen species; SCO; SOOT OXIDATION; MIXED OXIDES; REDUCTION; NANOPARTICLES; GENERATION; CUO/TIO2; SURFACE; OXYGEN; NH3;
D O I
10.1016/j.apsusc.2017.03.107
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this study, CuO-TiO2 (Cu-x-Ti) mixed-oxide catalysts with different Cu content prepared by sol-gel method were firstly used to selective catalytic oxidation (SCO) of NO. The catalytic activity test revealed that catalysts, especially Cu-0.07-Ti, exhibited much higher catalytic performance than CuO supported TiO2 (Cu-0.07/Ti) catalyst. XRD, EDS, Raman, XPS, H-2-TPR, O-2-TOD, NO-TPD and DRIFT measurements were used for characterizing the catalysts. The results of characterizations reveled that Cu-0.07-Ti catalysts possessed high dispersed CuO. This feature of Cu-0.07-Ti resulted in a strong interaction of Cu species with TiO2 support in compared to Cu-0.07/Ti. This strong interaction not only enhanced amounts of active oxygen species by promoting the formation of oxygen vacancies, but also activated adsorbed NO over Cu-0.07-Ti catalysts. In addition, on the basis of NO2 formation, it also promoted the decomposition of nitrate species to NO2 over Cu-0.07-Ti catalyst. Based on the above mentioned favorable properties, Cu-0.07-Ti catalysts had an excellent NO-SCO performance. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码:227 / 234
页数:8
相关论文
共 44 条
[1]   Fractional-hydrolysis-driven formation of nonuniform dopant concentration catalyst nanoparticles of Cr/CexZr1-xO2 and their catalysis in oxidation of NO [J].
Cai, Wei ;
Zhong, Qin ;
Zhang, Shule ;
Zhao, Wei .
CHEMICAL ENGINEERING JOURNAL, 2014, 236 :223-232
[2]  
Fang B., 2015, ACS SUSTAINABLE CHEM
[3]  
Gas M. V., 2015, APPL CATAL B-ENVIRON, V179, P249
[4]   Preparation, characterisation and testing of CuO/Ce0.8Zr0.2O2 catalysts for NO oxidation to NO2 and mild temperature diesel soot combustion [J].
Gimenez-Manogil, Javier ;
Bueno-Lopez, Agustin ;
Garcia-Garcia, Avelina .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2014, 152 :99-107
[5]   Sodium-promoted NO adsorption under lean conditions over Cu/TiO2 catalysts [J].
Guerrero, Sichem ;
Guzman, Igor ;
Aguila, Gonzalo ;
Araya, Paulo .
CATALYSIS COMMUNICATIONS, 2009, 11 (01) :38-42
[6]   Preparation and characterization of CeOx@MnOx core-shell structure catalyst for catalytic oxidation of NO [J].
Guo, Rui-tang ;
Chen, Qi-lin ;
Ding, Hong-lei ;
Wang, Qing-shan ;
Pan, Wei-guo ;
Yang, Ning-zhi ;
Lu, Chen-zi .
CATALYSIS COMMUNICATIONS, 2015, 69 :165-169
[7]   Superoxide Ion: Generation and Chemical Implications [J].
Hayyan, Maan ;
Hashim, Mohd Ali ;
AlNashef, Inas M. .
CHEMICAL REVIEWS, 2016, 116 (05) :3029-3085
[8]  
Hu J., 2014, Res. Chem. Intermed, V41, P1
[9]  
Hu YHH, 2014, ABSTR PAP AM CHEM S, V248
[10]   SO2 Poisoning of the NH3-SCR Reaction over Cu-SAPO-34: Effect of Ammonium Sulfate versus Other S-Containing Species [J].
Jangjou, Yasser ;
Wang, Di ;
Kumar, Ashok ;
Li, Junhui ;
Epling, William S. .
ACS CATALYSIS, 2016, 6 (10) :6612-6622