碱土金属离子改性CeO_(2)的合成及其储氧性能研究  

Synthesis and Oxygen Storage Capacity of CeO;Powders Modified by Alkaline Earth Metal Ions

作　　者：黄明慧 陈宇坤 唐鸿 高努男 徐要辉 HUANG Minghui;CHEN Yukun;TANG Hong;GAO Nunan;XU Yaohu(School of Electronics and Materials Engineering,Chengdu Sichuan 610207,China;Laboratory for Functional Materials,Chengdu Sichuan 610207,China;Western Silicon Material Photovoltaic New Energy Industry Technology Research Institute,Leshan Normal University,Leshan Sichuan 614000,China;College of Polymer Science and Engineering,Sichuan University,Chengdu Sichuan 610207,China)

机构地区：[1]乐山师范学院电子与材料工程学院,四川乐山614000 [2]乐山师范学院功能材料实验室,四川乐山614000 [3]乐山师范学院西部硅材料光伏新能源产业技术研究院,四川乐山614000 [4]四川大学高分子科学与工程学院,四川成都610207

出　　处：《乐山师范学院学报》2021年第12期28-32,共5页Journal of Leshan Normal University

基　　金：省级大学生创新创业训练计划项目“CeO_2介孔材料的无模板绿色合成工艺研究”(S202010649071);乐山师范学院重点项目“高比表面积介孔二氧化铈的绿色合成工艺研究”(LZD021);乐山市科技局重点研究项目“一种负载型稀土氧化物的制备工艺及其结构与性能研究”(20GZD037)。

摘　　要：以硝酸铈为原料、水和乙二醇为混合溶剂,采用溶剂热工艺得到了铈的前驱体,其主要物相成分为Ce(CO_(3))OH,之后联合浸渍工艺和焙烧工艺最终得到了Mg^(2+)、Ca^(2+)和Ba^(2+)离子改性的CeO_(2)粉体。通过XRD和SEM表征了CeO_(2)样品的物相结构和形貌,采用H2-TPR测试系统评估了单相CeO_(2)以及Mg^(2+)、Ca^(2+)和Ba^(2+)离子改性CeO_(2)的储氧能力。以H_(2)的消耗量定量地表征了CeO_(2)的储氧能力,其中单相CeO_(2)的储氧能力为0.226 mmol/g,Ca^(2+)离子改性后其储氧能力下降了33.6%,Mg^(2+)离子改性后其储氧能力略有上升(13.3%),而Ba^(2+)离子改性后其储氧能力得到了较大的提高,其储氧能力为0.401 mmol/g,上升幅度高达77.4%.A cerium precursor was obtained by solvothermal process using Ce(NO_(3))_(3)·6 H_(2)O as cerium source,water and ethylene glycol as mixed solvent.The main component of as-obtained cerium precursor was Ce(CO_(3))OH.The CeO_(2) powders modified by Mg^(2+),Ca^(2+) and Ba^(2+) ions were obtained by combined impregnation process and calcination process.The phase structure and morphology of CeO_(2) sample were characterized by XRD and SEM analyses.The oxygen storage capacity of pure CeO_(2) and the CeO_(2) powders modified by Mg^(2+),Ca^(2+) and Ba^(2+) were evaluated by H_(2)-TPR.The oxygen storage capacity of CeO_(2) powders was quantified by H_(2) consumption.The oxygen storage capacity of pure CeO_(2) was 0.226 mmol/g,decreased by 33.6%after Ca^(2+)-modifying,while increased slightly by 13.3%after Mg^(2+)-modifying,and increased by 77.4%after Ba^(2+)-modifying with the value of 0.401 mmol/g.

关 键 词：二氧化铈 改性 碱土金属 钡离子 储氧能力 

分 类 号：O775[理学—晶体学]