An exploration of soot oxidation over CeO2-ZrO2 nanocubes: Do more surface oxygen vacancies benefit the reaction?

被引：72

作者：

Liu, Shuang ^{[1
]}

Wu, Xiaodong ^{[2
]}

Tang, Jia ^{[1
]}

Cui, Pengyu ^{[1
]}

Jiang, Xiaoqian ^{[1
]}

Chang, Chenggong ^{[1
]}

Liu, Wei ^{[1
]}

Gao, Yuxi ^{[2
]}

Li, Min ^{[3
]}

Weng, Duan ^{[2
]}

机构：

[1] Ocean Univ China, Inst Mat Sci & Engn, Qingdao 266100, Peoples R China

[2] Tsinghua Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Mat, Beijing 100084, Peoples R China

[3] Haier Grp Tech R&D Ctr, Qingdao 266100, Peoples R China

来源：

CATALYSIS TODAY | 2017年 / 281卷

基金：

中国博士后科学基金;

关键词：

CeO2-ZrO2; nanocubes; Soot oxidation; Surface oxygen vacancy; O-x--> O2-transformation; Surface oxygen regeneration; CERIUM OXIDE NANOPARTICLES; MODIFIED CEO2 CATALYSTS; ZIRCONIA CATALYSTS; SOLID-SOLUTIONS; DIESEL SOOT; COMBUSTION; PERFORMANCE; METHANE;

D O I：

10.1016/j.cattod.2016.05.036

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

CeO2, Ce2oZr1 and Ce10Zr1 mixed oxides with uniform nanocubic morphology and varied amounts of surface oxygen vacancies were synthesized to study the influence of surface oxygen vacancies on soot catalytic oxidation in a low concentration of gaseous O-2. It is presented that excessive surface oxygen vacancies may lead to low soot oxidation activity and catalyst deactivation during the reaction. H-2-TPR results indicate that the doping of Zr does not decrease the amount of surface redox sites. Instead, it induces the formation of surface capping oxygen (O2-) rather than the highly active O-x(-) species, which hereby affects the catalyst behavior significantly. These point out that a ceria-based catalyst should not contain too many surface oxygen vacancies when designing for the application in gasoline particulate filters. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：454 / 459

页数：6

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