Preparation of a CeO2–ZrO2 based nano-composite with enhanced thermal stability by a novel chelating precipitation method |
| |
Affiliation: | 1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes and School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, PR China;2. School of Metallurgy and Chemistry Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China;3. General Research Institute for Non-Ferrous Metals, Grirem Advanced Materials Co., Ltd, Beijing, 100088, China |
| |
Abstract: | In this study, a chelating agent is introduced to prepare CeO2–ZrO2 nano-composite through a precipitation process. The physicochemical properties of the oxide precursors, nano composite materials are strongly dependent on the preparation method and whether a chelating agent is used. Adding an appropriate quantity of chelating agent SO42? can facilitate thermal stability and phase structure uniformity of CeO2–ZrO2 mixed oxides. The calculation results showed that the Gibbs free energy of chelating complex of ZrSO4]2+ (ΔG = ?127.2469 kJ/mol) is higher than the Ce(III)SO4]+ (ΔG = -29.8279 kJ/mol). The precipitation chemical potential of Zr4+ moves close to the precipitation chemical potential of Ce3+. The novel and low-cost chelating precipitation method can modify the homogeneity of the compounds at the atomic scale, which can offer a powerful opportunity for, and provide direction in, the design of materials with exceptional properties. |
| |
Keywords: | Co-precipitation Thermal stability Chelating agent |
本文献已被 ScienceDirect 等数据库收录! |
|