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Study on Catalytic Properties of Nano-CeO2-ZrO2 Mixed Oxides Prepared by Modified Sol-Gel Method

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Author(s): YUAN Wen- Hui, ZHOU Chen-Chen, LI Li

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 25;
Issue: 8;
Start page: 820;
Date: 2010;
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Keywords: hydrogen production; steam reforming of ethanol; nanosized CeO2-ZrO2; modified Sol-Gel method

ABSTRACT
The nanosized CeO2-ZrO2 solid solutions were prepared by modified Sol-Gel method with Ce(NO3)3·6H2O and ZrO(NO3)2·2H2O as starting materials. The effects of different Ce/Zr molar ratio and calcination temperature on the particle size, crystal type and reducibility were studied to obtain optimal preparation condition. CeO2-ZrO2 solid solution was characterized by XRD, SEM and TPR measurements. Results show that the highest specific surface area of CeO2-ZrO2 solid solution is 92m2/g while Ce/Zr molar ratio is 3: 1. CeO2-ZrO2 solid solution prepared by modified Sol-Gel method is fluorite structured. TPR results show that CeO2-ZrO2 solid solution calcined at 450¡䟨as good catalytic reducibility. Catalytic properties are estimated through a fix-bed reactor under atmospheric pressure. CeO2-ZrO2 solid solution with Ce/Zr molar ratio of 3: 1 show higher catalytic activity and selectivity to ethanol steam reforming reaction than those of CeO2 and other molar ratio CeO2-ZrO2 solid solution. Both reducibility and heat stability of CeO2 can be improved with the addition of ZrO2.

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Tangokurs Rapperswil-Jona

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