Journal of Inorganic Materials >
Study on Catalytic Properties of Nano-CeO2-ZrO2 Mixed Oxides Prepared by Modified Sol-Gel Method
Received date: 2009-12-15
Revised date: 2010-02-06
Online published: 2010-07-19
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℃ has 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.
YUAN Wen- Hui, ZHOU Chen-Chen, LI Li . Study on Catalytic Properties of Nano-CeO2-ZrO2 Mixed Oxides Prepared by Modified Sol-Gel Method[J]. Journal of Inorganic Materials, 2010 , 25(8) : 820 -824 . DOI: 10.3724/SP.J.1077.2010.00820
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