NOx Adsorption Over Ce/Zr-Based Catalysts Doped with Cu and Ba

被引：7

作者：

Gimenez-Manogil, J. ^{[1
]}

Martinez-Munuera, J. C. ^{[1
]}

Matarrese, R. ^{[2
]}

Castoldi, L. ^{[2
]}

Lietti, L. ^{[2
]}

Garcia-Garcia, A. ^{[1
]}

机构：

[1] Univ Alicante, Dept Inorgan Chem, Inst Mat, MCMA Grp, Ap 99, E-03080 Alicante, Spain

[2] Politecn Milan, Dipartimento Energia, Lab Catalysis & Catalyt Proc, Via La Masa 34, I-20156 Milan, Italy

来源：

TOPICS IN CATALYSIS | 2019年 / 62卷 / 1-4期

关键词：

Ceria-zirconia; Copper species; NOx adsorption; Nitrites; nitrates; DIESEL SOOT; CARBON-MONOXIDE; MIXED OXIDES; REDUCTION; STORAGE; COPPER; CERIA; OXIDATION; SURFACE; CE;

D O I：

10.1007/s11244-018-1130-z

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

In this study, Ce/Zr-based materials without noble metals in their formulation have been prepared, characterized and tested in NOx adsorption at different temperatures. In particular, the effect of the presence of Ba and Cu in the catalytic formulation has been investigated. The catalyst characterization shows that the redox properties of the catalysts are enhanced by Cu and inhibited by Ba. Upon interaction with NO/O-2, it is found that NOx are stored at low temperatures (150 degrees C) in the form of nitrites, without any relevant NO oxidation activity. This suggests a direct NO uptake. At higher temperatures (300 degrees C) a significant NO oxidation activity is observed, that is enhanced by Cu and depressed by Ba. In this case, NOx are stored in the form of nitrates; the samples containing both Ba and Cu exhibits the better performances in terms of NOx adsorption capacity.

引用

页码：140 / 149

页数：10

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