The key surface species and oxygen vacancies in MnOx(0.4)-CeO2 toward repeated soot oxidation

被引：176

作者：

He, Hui ^{[1
]}

Lin, Xueting ^{[1
]}

Li, Shujun ^{[1
]}

Wu, Zeng ^{[1
]}

Gao, Jingheng ^{[1
]}

Wu, Junliang ^{[1
]}

Wen, William ^{[3
]}

Ye, Daiqi ^{[1
,2
]}

Fu, Mingli ^{[1
,2
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, Peoples R China

[2] South China Univ Technol, Guangdong Prov Engn & Technol Res Ctr Environm Ri, Guangzhou 510006, Guangdong, Peoples R China

[3] Griffith Univ, Ctr Clean Environm & Energy, Environm Futures Ctr, Sch Environm, Gold Coast, Qld 4222, Australia

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 223卷

基金：

中国国家自然科学基金;

关键词：

MnOx(0.4)-CeO2; Surface species; Oxygen vacancies; Soot oxidation; SOLID-SOLUTIONS; DIESEL SOOT; CATALYTIC COMBUSTION; COMPOSITE CATALYSTS; RAMAN-SPECTROSCOPY; CEO2; CATALYSTS; MIXED OXIDES; NOX; CO; REDUCTION;

D O I：

10.1016/j.apcatb.2017.08.084

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：

Surface species and oxygen vacancies were studied in MnOx(0.4)-CeO2 toward repeated soot oxidation. MnOx(0.4)-CeO2 catalysts prepared by the citric acid complex method were repeatedly used in a 10% O-2/Ar gas flow and showed favorable activity and satisfactory durability toward soot oxidation. X-ray diffraction (XRD), N-2 adsorption/desorption, Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and in situ visible/UV Raman characterization methods were utilized to investigate the structural features of fresh and reused catalysts. The irreversible conversion of high valence manganese species as well as the reduction of Frenkel-type oxygen vacancies and lattice oxygen could be clearly observed in the reused samples, which were associated with the slight deactivation. Spectators and participators were two existing forms of Frenkel-type oxygen vacancies. It was noteworthy that the participators almost fully regenerated after each reaction cycle, which ensured the ability to activate Ghat, in repeated soot oxidation process. Therefore, the catalysts maintained favorable activity and satisfactory durability, which was mainly because the relatively stable level of participators.

引用

页码：134 / 142

页数：9

共 57 条

[41] Role and reduction of NOx in the catalytic combustion of soot over iron-ceria mixed oxide catalyst [J].