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.
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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