Effect of Precipitation Method on Performance of CeO2-ZrO2-Al2O3 Composite Oxide

被引：0

作者：

Yang H. ^{[1
]}

Yan Q. ^{[1
]}

Wei Q. ^{[1
]}

Chen Y. ^{[1
]}

Zhu L. ^{[1
]}

Qin L. ^{[1
]}

Xiao Y. ^{[2
]}

机构：

[1] Guangxi Key Laboratory of Agricultural Resources Chemistry and Biotechnology, Yulin Normal University, Yulin

[2] National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou

来源：

Zhongguo Xitu Xuebao/Journal of the Chinese Rare Earth Society | 2020年 / 38卷 / 02期

关键词：

CeO[!sub]2[!/sub]-ZrO[!sub]2[!/sub]-Al[!sub]2[!/sub]O[!sub]3[!/sub] composite oxide; Oxygen storage capacity; Precipitation method; Reducibility;

D O I：

10.11785/S1000-4343.20200205

中图分类号：

学科分类号：

摘要：

Ceria-zirconia-alumina composite oxides (the molar ratio of Ce, Zr and Al is 1:1:2) were prepared by the coprecipitation (CZA), mixing suspension of precipitates (CZ+A), stepwise precipitation Ⅰ (CZ-A) and Ⅱ (A-CZ) methods, respectively. The structure and performance of the composite oxides were studied by X-ray diffraction (XRD) and other means. The results showed that the characteristic diffraction peaks belonging to Zr0.4Ce0.6O2 cubic phase only appeared in the four kinds of samples, among which the cell parameters and crystal size of CZA-1000 were significantly smaller; Four kinds of samples possessed mesoporous characteristics, larger specific surface area, and only CZA-1000 still showed unimodal distribution curve, narrow and the smallest pore size distribution. The oxygen storage capacity (OSC) of the aging CZA-1000 was the largest. The main peak temperature of the reduction peak of CZA-1000 was 23~30℃ lower than that of the other three aging samples. The bulk phase oxygen of CZA-1000 has stronger mobile performance, while the main peak temperature of the reduction peak of the other three aging samples were higher and the sintering is more serious. It was found that the particles of cerium-zirconium and alumina in the CZA samples prepared by co-precipitation were evenly mixed at the nanoscale, with stronger interaction and better "diffusion obstruction" effect among each other, thus exhibiting better structure, texture, oxygen storage, reduction and heat resistance properties. © 2020, Editorial Office of Journal of the Chinese Society of Rare Earths. All right reserved.

引用

页码：160 / 168

页数：8

共 34 条

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