In 3+ 掺杂CeO 2 的固溶度及其储氧能力 *

CeO2 is an important rare earth oxide and can be used in automotive exhaust three-way catalysts on the basis of its oxygen storage capability. Ion doping is an effective method to enhance the oxygen storage capability of CeO2. And when doping a cation whose size is smaller than Ce and valence is lower than +4, it tends to evolve more defects. It is known that defects play important roles in enhancing the oxygen storage capability of CeO2. Therefore, In ion was selected as a dopant cation which matches above two factors of size and valence. In this work, a series of CeO2 with different content of In were synthesized via a two-step process. The precursor was synthesized by a solvothermal method at 200 °C using a mixture solvent of (CH2OH)2 and H2O, as well as Ce(NO3)3·6H2O and In(NO3)3∙4.5H2O as Ce and In sources, respectively. CeO2 was obtained after the precursor was calcined at 500 °C for 2 h in air. It was found that the solid solubility of In in CeO2 was 1% (molar fraction). The doping of 1%In in CeO2 almost had no impact on the morphology of multilayered structure. However, a second phase of small particles appeared and there were some changes of the morphology of multilayered structure when the concentration of In increased further. The specific surface area of the 1%In solid solution was 100 m/g, *国家自然科学基金资助项目51372006 收到初稿日期: 2015-10-08,收到修改稿日期: 2015-11-11 作者简介:张世政,男,回族, 1990年生,硕士生 DOI: 10.11900/0412.1961.2015.00516 第607-613页 pp.607-613