简介概要

A rationale for the development of thermally stable nanostructured CeO2-ZrO2-containing mixed oxides

来源期刊:JOURNAL OF RARE EARTHS2008年第2期

论文作者:Colin Norman Heather Bradshaw Roberta Di Monte Jan Ka

Key words:CeO2-ZrO2 mixed oxides; CeO2-ZrO2 solid solution; CeO2-ZrO2 mixed oxides,thermal stability of; three-way catalysts; oxygen storage capacity; rare earths;

Abstract: CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for practical application since temperatures up to 1273 K are easily experienced by these materials under real working conditions. In the present paper, we investigated how hydrothermal treatments applied to cakes of doped and undoped ZrO2-rich CeO2-ZrO2 precursors might improve the thermal stability of the final CeO2-ZrO2 solid solution. A rationale was developed that allowed to correlate the morphology of the hydrothermally treated cake with the thermal stability at 1273 K of the final product, which did not depend on the composition of the mixed oxides.

详情信息展示

A rationale for the development of thermally stable nanostructured CeO2-ZrO2-containing mixed oxides

Colin Norman1,Heather Bradshaw1,Roberta Di Monte2,Jan Ka3

(1.MEL Chemicals, P.O. Box 6, Clifton Junction, Swinton, Manchester M27 8LS, England;
2.s;
3.s)par(s)

Abstract:CeO2-ZeO2 solid solutions are extensively used as oxygen storage promoters in the current automotive three-way catalysts. High thermal stability of the textural properties is one of the most important requirements for practical application since temperatures up to 1273 K are easily experienced by these materials under real working conditions. In the present paper, we investigated how hydrothermal treatments applied to cakes of doped and undoped ZrO2-rich CeO2-ZrO2 precursors might improve the thermal stability of the final CeO2-ZrO2 solid solution. A rationale was developed that allowed to correlate the morphology of the hydrothermally treated cake with the thermal stability at 1273 K of the final product, which did not depend on the composition of the mixed oxides.

Key words:CeO2-ZrO2 mixed oxides; CeO2-ZrO2 solid solution; CeO2-ZrO2 mixed oxides,thermal stability of; three-way catalysts; oxygen storage capacity; rare earths;

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