碳酸铵水解法制备耐高温介孔CeO_2材料(英文)  

Preparation of Mesoporous CeO_2 with High Thermal Stability by Ammonium Carbonate Hydrolysis Method

作　　者：陈山虎[1] 曹毅[1] 兰丽[1] 赵明[1] 史忠华[1] 龚茂初[1] 陈耀强[1] 

机构地区：[1]四川大学化学学院,绿色化学与技术教育部重点实验室,成都610064

出　　处：《无机化学学报》2013年第10期2231-2238,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.20803049,21173153)资助项目

摘　　要：以H2O2为氧化剂,分别以传统沉淀法(以氨水为沉淀剂)和碳酸铵水解法制备了CeO2材料。采用傅里叶变换红外(FTIR)、拉曼光谱(Raman)、热重-差示扫描分析(TG-DTA)及X光电子能谱(XPS)等手段对沉淀前躯体及其分解过程进行了研究。结果表明,在碳酸铵水解法制备的前躯体中含有O22-,CO32-和OH-物种,而在水解过程中,碳酸根会逐渐被氢氧根取代。虽然两者方法制备的沉淀的化学成分基本一样,但碳酸铵水解法改变了沉淀颗粒的堆积方式,因此制备的CeO2具有更好的抗高温老化性能和还原性能。经过900℃焙烧3 h后,比表面仍有27 m2·g-1。Two series of CeO2 materials were prepared by two different synthetic routes, i.e. the conventional ammonia precipitation route （CR） and the ammonium carbonate hydrolysis route （HA） using （NH4）=CO3 in the presence of hydrogen peroxide. The formation process and decomposition behavior of the precipitates were investigated by FTIR, Raman, thermogravimetric and differential thermal analysis （TG/DTA） and X-ray photoelectron spectroscopy （XPS）. The results show that the as-prepared precipitate obtained by HA consists of 022-, CO3z- and OH- species. However, after hydrothermal digestion at 80 ~C, the CO32- species is gradually hydrolyzed into OH- species. Although the chemical components of the digested precipitates prepared by these two routes are almost the same, the agglomeration of CeOa particles is markedly modified. The CeO2 powder produced by HA exhibits higher thermal stability and better reduction property compared to that obtained by CR. After the heat treatment at 900 ℃ for 3 h, the CeO2 powder from HA route still remains a surface area of 27 m2. g-1.

关 键 词：水解法 传统沉淀法 耐高温 氧化还原性能 

分 类 号：O614.332[理学—无机化学]