Mechanistic Investigation of the Promotion Effect of Bi Modification on the NH3-SCR Performance of Ce/TiO2 Catalyst

被引：59

作者：

Guo, Rui-tang ^{[1
]}

Li, Ming-yuan

Sun, Peng

Pan, Wei-guo ^{[1
]}

Liu, Shu-ming

Liu, Jian

Sun, Xiao

Liu, Shuai-wei

机构：

[1] Shanghai Univ Elect Power, Sch Energy Source & Mech Engn, Shanghai 200090, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2017年 / 121卷 / 49期

基金：

上海市自然科学基金;

关键词：

MIXED-OXIDE CATALYST; LOW-TEMPERATURE SCR; ENHANCED PERFORMANCE; NOX REDUCTION; DEACTIVATION MECHANISM; SURFACE-PROPERTIES; MN/TIO2; CATALYST; NITRIC-OXIDE; NH3; DRIFT;

D O I：

10.1021/acs.jpcc.7b10342

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, Bi was used as the modifier to elevate the performance of Ce/TiO2 catalyst for selective catalytic reduction (SCR) of NOx with NH3. Experimental results indicated that the CeBi/TiO2 catalyst with a Bi/Ce molar ratio of 0.15 exhibited excellent low-temperature SCR performance and SO2/H2O resistance compared with the Ce/TiO2 catalyst. Characterization results revealed that the introduction of a proper amount of Bi to Ce/TiO2 catalyst could generate more Ce3+ and chemisorbed oxygen species on its surface, along with the enhanced reducibility and surface acidity. From the results of an in situ DRIFT study, the formation of more adsorbed NH3 and NO2 species could be detected, as a result, greatly facilitating the low-temperature NH3-SCR reaction over CeBi/TiO2-0.15 catalyst through the Langmuir-Hinshelwood route.

引用

页码：27535 / 27545

页数：11

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