镨在三效催化剂中的作用

被引：7

作者：

汪文栋

林培琰

机构：

[1] 中国科学技术大学化学物理系!安徽合肥

来源：

稀土 | 2000年 / 04期

关键词：

镨; Ce-Zr固溶体; 三效催化剂; 储氧量;

D O I：

10.16533/j.cnki.15-1099/tf.2000.04.010

中图分类号：

O643.361 [];

学科分类号：

081705 ;

摘要：

本文采用溶胶 -凝胶法制备了负载在γ- Al2 O3上 ,含有 Ce- Zr、Pr- Zr、Ce- Pr- Zr固溶体的样品。进行了三效催化活性的评价 ,程序升温还原 ( TPR)表征和储氧量的测定。结果表明 ,样品均具有较高的三效催化活性 ,尤其是含有 Pr的样品 ,老化后在富氧区 ( S=1 .30 )的 NOx 转化率较高 ,达到 65%以上 ,其中由 Pr修饰的 Ce- Zr固溶体的样品的储氧量最大。

引用

页码：34 / 37

页数：4

共 11 条

[1]

Thermalstability of oxyged storage properties in a mixedCe O2 - Zr O2 system〔J〕. Hori C E,Permana H,Simon Ng K Y et al. Applied Catalysis B Environmental . 1 998

[2]

XANES studies of the reduction behavior of( Ce1- YZr Y) O2 and Rh/( Ce1- YZr Y) O2 〔J〕. Overbury S H,Huntley D R,Mullins D R et al. Catalysis Letters . 1 998

[3]

An examina-tion of praseodymia as an oxygen- storage componentin three- way catalysts〔J〕. Putna E S,Vohs JM,Gorte R Jet al. Catal L ett . 1 998

[4]

Effects oftrivalent dopants on the redox properties of Ce0.6Zr0 .4 O2 mixed oxide〔J〕. Vidmar P,Fornasiero P,Kaspar J et al. Journal of Catalysis . 1 997

[5]

Role of research in the devel-opment of new generation automotive catalysts〔J〕. Gandhi H S,Shelef M. Studies in Surface Science and Catalysis . 1 987

[6]

Computersimulation studies of bulk reduction and oxygen mi-gration in Ce O2 - Zr O2 solid solutions〔J〕. Balducci G,Kaspar J,Forniasero P et al. The Journal of Physical Chemistry . 1 997

[7]

Originsof low- temperature three- way activity in Pt/Ce O2〔J〕. Golunski S E,Hatcher H,Rajaram R R et al. Applied Catalysis B Environmental . 1 995

[8]

Reduction ofceria with different textures by hydrogen and their re-oxidation by oxygen〔J〕. Perrichon V,Laachir A,Bergeret G et al. Journal of the Chemical Society Faraday Transactions . 1 994

[9]

Relationshipbetween the zirconia- promoted reduction in theRhloaded Ce0.5Zr0 .5O2 mixed oxide and the Zr- O localstructure〔J〕. Vlaic G,Fornasiero P,Geremia S et al. Journal of Catalysis . 1 997

[10]

Surface characteri-zation of alumina- supported ceria〔J〕. Shyu JZ,Weber W H,Gandhi H S. The Journal of Physical Chemistry . 1 988

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