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

被引：435
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
收藏
页码：91 / 102
页数：12
相关论文
共 59 条
  • [1] Defect Chemistry of Ceria Nanorods
    Agarwal, S.
    Zhu, X.
    Hensen, E. J. M.
    Lefferts, L.
    Mojet, B. L.
    [J]. JOURNAL OF PHYSICAL CHEMISTRY C, 2014, 118 (08) : 4131 - 4142
  • [2] Nanocatalysis I: Synthesis of Metal and Bimetallic Nanoparticles and Porous Oxides and Their Catalytic Reaction Studies
    An, Kwangjin
    Somorjai, Gabor A.
    [J]. CATALYSIS LETTERS, 2015, 145 (01) : 233 - 248
  • [3] Aneggi E., 2006, APPL CATAL B, V114
  • [4] Manganese oxide catalysts synthesized by exotemplating for the total oxidation of ethanol
    Bastos, S. S. T.
    Orfao, J. J. M.
    Freitas, M. M. A.
    Pereira, M. F. R.
    Figueiredo, J. L.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2009, 93 (1-2) : 30 - 37
  • [5] Soot combustion manganese catalysts prepared by thermal decomposition of KMnO4
    Becerra, M. E.
    Arias, N. P.
    Giraldo, O. H.
    Lopez Suarez, F. E.
    Illan Gomez, M. J.
    Bueno Lopez, A.
    [J]. APPLIED CATALYSIS B-ENVIRONMENTAL, 2011, 102 (1-2) : 260 - 266
  • [6] IR study of polycrystalline ceria properties in oxidised and reduced states
    Binet, C
    Daturi, M
    Lavalley, JC
    [J]. CATALYSIS TODAY, 1999, 50 (02) : 207 - 225
  • [7] Solar assisted photocatalytic degradation of Naphthol Blue Black dye using Ce1-xMnxO2
    Borker, Pritam
    Salker, A. V.
    [J]. MATERIALS CHEMISTRY AND PHYSICS, 2007, 103 (2-3) : 366 - 370
  • [8] Co3O4-CeO2 mixed oxide-based catalytic materials for diesel soot oxidation
    Dhakad, M.
    Mitshuhashi, T.
    Rayalu, S.
    Doggali, Pradip
    Bakardjiva, S.
    Subrt, J.
    Fino, D.
    Haneda, H.
    Labhsetwar, Nitin
    [J]. CATALYSIS TODAY, 2008, 132 (1-4) : 188 - 193
  • [9] Fu ML, 2012, CHINESE J INORG CHEM, V28, P1593
  • [10] Soot oxidation via CuO doped CeO2 catalysts prepared using coprecipitation and citrate acid complex-combustion synthesis
    Fu, Mingli
    Yue, Xianghui
    Ye, Daiqi
    Ouyang, Jiehong
    Huang, Bichun
    Wu, Junhang
    Liang, Hong
    [J]. CATALYSIS TODAY, 2010, 153 (3-4) : 125 - 132
123456