Evolution of oxygen vacancies in MnOx-CeO2 mixed oxides for soot oxidation

被引：453

作者：

Lin Xueting ^{[1
]}

Li Shujun ^{[1
]}

He Hui ^{[1
]}

Wu Zeng ^{[1
]}

Wu Junliang ^{[1
]}

Chen Limin ^{[1
]}

Ye Daiqi ^{[1
,2
,3
]}

Fu Mingli ^{[1
,2
,3
]}

机构：

[1] South China Univ Technol, Sch Environm & Energy, Guangzhou 510006, Guangdong, Peoples R China

[2] Guangdong Prov Key Lab Atmospher Environm & Pollu, Guangzhou 510006, Guangdong, Peoples R China

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

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-CeO2 mixed oxides; Soot; Solid solution; Oxygen vacancies; Surface active species; CATALYTIC COMBUSTION; DIESEL SOOT; SOLID-SOLUTIONS; LATTICE OXYGEN; CEO2; CATALYSTS; ACTIVE-SITES; NANOROD-LIKE; PART I; REDUCTION; ALUMINA;

D O I：

10.1016/j.apcatb.2017.06.071

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：

Oxygen vacancy (O-vacancy) is essential in catalytic oxidation but little is known about its insight. Herein, a series of MnOx-CeO2 catalysts with various Mn/(Mn + Ce) molar ratios were synthesized with citric acid complex method for O-vacancy study in soot catalytic combustion. The samples were characterized by X-ray powder diffraction (XRD), N-2 adsorption/desorption, O-2-temperature programmed desorption (O-2-TPD), H-2-temperature programmed reduction (H-2-TPR), X-ray photoelectron spectroscopy (XPS) and in situ Raman spectroscopy. It has been shown that MnOx(0.4)-CeO2 catalyst presented more O-vacancies, thus exhibiting the highest catalytic activities and redox properties. With the utilization of in situ Raman, two types of O-vacancies, including Frenkel-type oxygen vacancy (F-OV) and intrinsic oxygen vacancy (I-OV), were clarified. Furthermore, the transform relation between F-OV and I-OV was found. Those two types of O-vacancies favored to the migration and transformation of active species, enhancing further the oxidation-reduction cycle and the catalytic activity for soot oxidation. In addition, Mn4+/Mn3+(Mn2+), O-latt, O-sur and Ce4+/Ce3+ were believed to play important roles in soot oxidation. Finally, evolution of O-vacancies was proposed, which is of significance for soot catalytic oxidation. (C) 2017 Elsevier B.V. All rights reserved.

引用

页码：91 / 102

页数：12

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