碳酸铵水解法制备耐高温介孔CeO2材料.pdf

第29卷第10期
机化学学报
Vol, 29 No10
2013年10月
CHINESE JOURNAL OF INORGANIC CHEMISTRY
2231-2238
碳酸铵水解法制备耐高温介孔CeO2材料
陈山虎曹毅兰丽赵明史忠华*龚茂初陈耀强
(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)
摘要:以H1O2为氧化剂,分别以传统沉淀法(以氨水为沉淀剤)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-一差示扫描分析(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02,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,但碳酸铍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3h后,比表面仍有27m2·g
关键词:水解法;传统沉淀法;耐高温;氧化还原性能
中图分类号:0614.332
文献标识码:A
文章编号:1001-48612013)10-2231-08
DOI:10.3969%js8n.1001-4861.2013.00.219
Preparation of Mesoporous Ceo2 with High Thermal Stability
by Ammonium Carbonate Hydrolysis Method
CHEN Shan-hu CAO Yi LAN Li ZHAO Ming
SHI Zhong-hua " GONG Mao-chu CHEN Yao-qiang
(Key Laboratory of Green Chemistry and Technology of the Ministry of Education,
College of try, Sichuan Uniwersity, Chengdu 610064, China)
Abstract: Two series of Ceo 2 materials were prepared by two different synthetic routes, i.e. th
e convention
ammonia precipitation route (CR)and the ammonium carbonate hydrolysis route (HA)using (NH C03 in the
presence of hydrogen peroxide. The formation process and decomposition behavior of the precipitates were
investigated by MTTR, Raman, thermogravimetric and differential thermal analysis (TG/DTA)and X-ray
hotoelectron spectroscopy(P).The results show that the as-prepared precipitate obtained by HA consists of 02-,
CO and OH species. However, after hydrothermal digestion at 80, the CO 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 Ceo2 particles is markedly modified. The Ceo2 powder produced by HA exhibits
higher thermal stability and bet er reduction propety mared o tat obtained by CR After the heat treatment at
900 C for 3 h, the Ceo2 powder from HA route still remains a surface area of 27 m'g
Key words: hydrolysis method; conventional precipitation; high thermal stability; redox properties
Ce0 2 has attracted much attention in recent years and fuel cell technology 2. Moreover, Ceo2 has also
for its applications in many commercial process
been widely utilized as oxygen storage material in
such as catalytic wet oxidation oot combustion three way catalysts ( TWCS)for the purification of
收稿日期:2013-01-07。收修改稿目期:2013-03-19。
国家自然科学基金(No.20803049,21173153)资助项目。
*通讯联系人。E-mail:shih96@scu.edu.cn;会员登记号:S06N7858M1007。