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Journal of Materials Science

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26-01-2017 | Original Paper

The influence of H₂O₂ on the properties of CeO₂-ZrO₂ mixed oxides

Authors: Jie Deng, Yi Zhou, Yajuan Cui, Li Lan, Jianli Wang, Shandong Yuan, Yaoqiang Chen

Published in: Journal of Materials Science | Issue 9/2017

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Abstract

A series of ceria-zirconia (CZ) mixed oxides were prepared by coprecipitation, in which different amounts of H₂O₂ were added to investigate the influence of H₂O₂ on the properties of CZ. Modifications in structure, oxygen storage capacity, reducibility and thermal stability were studied systematically. The X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results revealed that the thermal stability of the material was dramatically improved by the addition of H₂O₂, which was mainly due to the increase of the solubility of ZrO₂ in ceria from 4.7 to 69.3%. The study of UV Raman spectroscopy confirmed that the concentration of defect sites of CZ materials increased with increasing H₂O₂/Ce molar ratio. The material prepared with H₂O₂/Ce molar ratio of 2 (CZ-2) exhibited the highest structural stability, the solubility of which was 68.8 and 69.3% before and after thermal treatment, and it maintained a homogeneous single cubic phase even after aging treatment at 1000 °C for 3 h. Also the highest thermal stability of the oxygen storage capacity (OSC) was found in CZ-2, which showed the reduction rates of 80.4 and 76.4% before and after thermal treatment. Moreover, a reaction mechanism of H₂O₂ and metal ions in the mixed precursor solution was assumed, in which the cerium-peroxide bridge-zirconium complex structure was proposed.

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Title: The influence of H2O2 on the properties of CeO2-ZrO2 mixed oxides
Authors: Jie Deng
Yi Zhou
Yajuan Cui
Li Lan
Jianli Wang
Shandong Yuan
Yaoqiang Chen
Publication date: 26-01-2017
Publisher: Springer US
Published in: Journal of Materials Science / Issue 9/2017
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-017-0765-7

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