Influence of partial Mn-substitution on surface oxygen species of LaCoO3 catalysts

被引：118
作者：
Liang, Hong [1 ]
Hong, Yanxia [1 ]
Zhu, Changquan [1 ]
Li, Shuhua [1 ]
Chen, Yao [1 ]
Liu, Zili [1 ]
Ye, Daiqi [2 ,3 ]
机构：
[1] Guangzhou Univ, Coll Chem & Chem Engn, Guangzhou 510006, Guangdong, Peoples R China
[2] S China Univ Technol, Sch Environm Sci & Engn, Guangzhou 510006, Guangdong, Peoples R China
[3] S China Univ Technol, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Minist Educ China, Guangzhou 510006, Guangdong, Peoples R China
来源：
CATALYSIS TODAY | 2013年 / 201卷
关键词：
LaCoO3; Surface oxygen species; Particulate matters; Partial substitution; COMPLEX OXIDE CATALYSTS; DIESEL SOOT; SIMULTANEOUS REMOVAL; NOX; CO; PERFORMANCE; OXIDATION;
D O I：
10.1016/j.cattod.2012.04.036
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A series of LaCo1-xMnxO3 (x = 0.05, 0.1, 0.3, 0.5, 0.7) perovskite-type catalysts were prepared by citric acid sol-gel method to study the influence of partial Mn-substitution on the catalytic performance and surface oxygen species of LaCoO3 perovskite-type catalysts. Their catalytic performances for particulate matters (PM) oxidation were investigated by a technique of temperature-programmed oxidation reaction (TPO), indicating that the catalytic performance of LaCo0.95Mn0.05O3 is better. The catalysts were characterized by XRD, BET, IR, H-2-TPR, O-2-TPD and XPS. The results show that LaCo1-xMnxO3 catalysts have perovskite-type structures after partially substituted by Mn. There are three kinds of oxygen species, lattice oxygen ion O-2(-), peroxide ion O- and superoxide ion O-2(-), are present on the surfaces of catalysts. The content of surface oxygen species varies with Mn-substitution amount. Superoxide ion O-2(-) and surface oxygen vacancy play an important role in the reaction of PM oxidation. (C) 2012 Elsevier B. V. All rights reserved.
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页码：98 / 102
页数：5
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