Effect of Ti4+ and Sn4+ co-incorporation on the catalytic performance of CeO2 -MnOx catalyst for low temperature NH3-SCR

被引：88

作者：

Chen, Li ^{[1
,2
]}

Yao, Xiaojiang ^{[1
]}

Cao, Jun ^{[1
]}

Yang, Fumo ^{[2
,3
]}

Tang, Changjin ^{[4
]}

Dong, Lin ^{[4
]}

机构：

[1] Chinese Acad Sci, Res Ctr Atmospher Environm, Chongqing Inst Green & Intelligent Technol, Chongqing 400714, Peoples R China

[2] Chongqing Univ, Sch Urban Construct & Environm Engn, Chongqing 400045, Peoples R China

[3] Sichuan Univ, Natl Engn Res Ctr Flue Gas Desulfurizat, Sch Architecture & Environm, Chengdu 610065, Sichuan, Peoples R China

[4] Nanjing Univ, Ctr Modern Anal, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2019年 / 476卷

基金：

中国国家自然科学基金;

关键词：

CeO2-MnOx-TiO2-SnO2; catalyst; Ti4+ and Sn4+ co-incorporation; Low-temperature NH3-SCR; Catalytic performance; By-product N2O; MNOX-CEO2 MIXED OXIDES; CARBON NANOTUBES; SO2; TOLERANCE; NO REDUCTION; FLUE-GAS; NH3; SCR; RAMAN; CEO2-TIO2; MECHANISM;

D O I：

10.1016/j.apsusc.2019.01.095

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：

A novel Ti4+ and Sn4- co-incorporated CeO2-MnOx based catalyst was synthesized by an inverse co-precipitation method with the purpose of inhibiting the formation of N2O and enhancing the NOx conversion of CeO2-MnOx catalyst for NH3-SCR at low temperature. The obtained catalysts were characterized by a series of XRD, Raman, N-2-physisorption, NH3-TPD, H-2-TPR, XPS, and in situ DRIFTS techniques in details. The experiment results suggested that CeO2-MnOx-TiO2-SnO2 (Ce-Mn-Ti-Sn) catalyst displayed the optimal catalytic performance with an enhancement of 30% compared with CeO2-MnOx(Ce-Mn) in the range of 225-275 degrees C. Moreover, the N2O formation was inhibited remarkably compared to Ce-Mn (152 ppm), and there was no N2O (0 ppm) detected even at 250 degrees C. This is linked to moderate weakening of redox property, more generation of acid sites, enhancement of acidic strength, as well as large amount of Ce3+, oxygen vacancies, and absorbed oxygen species, which are contributed to improving the chemical property of Ce-Mn-Ti-Sn catalyst, and further enhancing the catalytic performance and inhibiting the generation of N2O.

引用

页码：283 / 292

页数：10

共 49 条

[31] Novel Effect of H2O on the Low Temperature Selective Catalytic Reduction of NO with NH3 over MnOx-CeO2: Mechanism and Kinetic Study [J].