On the role of lattice/surface oxygen in ceria-zirconia catalysts for diesel soot combustion

被引：164

作者：

Aneggi, Eleonora ^{[1
]}

de Leitenburg, Carla ^{[1
]}

Trovarelli, Alessandro ^{[1
]}

机构：

[1] Univ Udine, Dipartimento Chim Fis & Ambiente, I-33100 Udine, Italy

来源：

CATALYSIS TODAY | 2012年 / 181卷 / 01期

关键词：

Ceria; Ceria-zirconia; Soot oxidation; Diesel pollution control; Oxygen storage capacity; Combustion; MODIFIED CEO2 CATALYSTS; EXPERIMENTAL MICROKINETIC APPROACH; CEO2-ZRO2 MIXED OXIDES; SURFACE-AREA CERIA; THERMAL-STABILITY; SIMULTANEOUS REMOVAL; STORAGE CAPACITY; REDOX PROPERTIES; EXHAUST-GASES; MODEL SOOT;

D O I：

10.1016/j.cattod.2011.05.034

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A series of ceria and ceria-zirconia catalysts with varying composition and surface area have been systematically investigated in the oxidation of soot in the range of temperature 600 K < T < 800 K. The samples have been characterized by their textural and structural properties and formation of homogeneous solid solutions has been confirmed. The activity in soot combustion has been measured both in the presence and absence of gas-phase O-2 in order to characterize the contribution of surface and bulk properties of the materials. It was shown that the number of active surface oxygen linked to ceria plays a major role, while oxygen storage capacity, governed by introduction of zirconia, can be important when and where oxidation of soot particles is operated in the absence or defect of gaseous oxygen. The role of Zr in stabilizing surface area of ceria (thus increasing the number of surface active sites) is also important when evaluating the effect of composition on soot oxidation activity. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：108 / 115

页数：8

共 76 条

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