Aluminum-doped ceria-zirconia solid solutions with enhanced thermal stability and high oxygen storage capacityReport as inadecuate




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Nanoscale Research Letters

, 7:542

Nano Component 2011

Abstract

A facile solvothermal method to synthesize aluminum-doped ceria-zirconia Ce0.5Zr0.5-xAlxO2-x-2, x = 0.1 to 0.4 solid solutions was carried out using CeNH42NO36, ZrNO33·2H2O AlNO33·9H2O, and NH4OH as the starting materials at 200°C for 24 h. The obtained solid solutions from the solvothermal reaction were calcined at 1,000°C for 20 h in air atmosphere to evaluate the thermal stability. The synthesized Ce0.5Zr0.3Al0.2O1.9 particle was characterized for the oxygen storage capacity OSC in automotive catalysis. For the characterization, X-ray diffraction, transmission electron microscopy, and the Brunauer-Emmet-Teller BET technique were employed. The OSC values of all samples were measured at 600°C using thermogravimetric-differential thermal analysis. Ce0.5Zr0.3Al0.2O1.9 solid solutions calcined at 1,000°C for 20 h with a BET surface area of 18 m g exhibited a considerably high OSC of 427 μmol-O g and good OSC performance stability. The same synthesis route was employed for the preparation of the CeO2 and Ce0.5Zr0.5O2. The incorporation of aluminum ion in the lattice of ceria-based catalyst greatly enhanced the thermal stability and OSC.

KeywordsSolvothermal Aluminum Solid solutions Catalysis Oxygen storage capacity Thermal stability Electronic supplementary materialThe online version of this article doi:10.1186-1556-276X-7-542 contains supplementary material, which is available to authorized users.

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Author: Qiang Dong - Shu Yin - Chongshen Guo - Tsugio Sato

Source: https://link.springer.com/







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