掺杂不同量Nd2O3对CeO2-ZrO2-Al2O3材料性能的影响

doi:10.3724/SP.J.1077.2012.11810

无机材料学报 ›› 2012, Vol. 27 ›› Issue (11): 1138-1144.DOI: 10.3724/SP.J.1077.2012.11810 CSTR: 32189.14.SP.J.1077.2012.11810

掺杂不同量Nd₂O₃对CeO₂-ZrO₂-Al₂O₃材料性能的影响

彭娜, 陈山虎, 周菊发, 陈耀强, 龚茂初

(四川大学绿色化学与技术教育部重点实验室, 成都610064)

收稿日期:2011-12-29 修回日期:2012-02-19 出版日期:2012-11-20 网络出版日期:2012-10-25
作者简介:彭娜(1985–), 女, 硕士研究生. E-mail: pengna777@163.com
基金资助:
国家自然科学基金重点项目(20773090, 20803049); 教育部博士点基金(20070610026, 200806100009)

Effect of Nd₂O₃ Doping Content on the Properties of CeO₂-ZrO₂-Al₂O₃

PENG Na, CHEN Shan-Hu, ZHOU Ju-Fa, CHEN Yao-Qiang, GONG Mao-Chu

(Key Laboratory of Green Chemistry &Technology of the Ministry of Education, Sichuan University, Chengdu 610064, China)

Received:2011-12-29 Revised:2012-02-19 Published:2012-11-20 Online:2012-10-25
About author:PENG Na. E-mail: pengna777@163.com
Supported by:
State Key Program of National Natural Science Foundation of China (20773090, 20803049); Specialized Research Fund for the Doctoral Program of Higher Education (20070610026, 200806100009)

摘要/Abstract

摘要： 采用共沉淀法制备了一系列Nd₂O₃含量为0~13wt%的CeO₂-ZrO₂-A1₂O₃(CZA)复合氧化物, 并通过X射线衍射(XRD)、低温N2吸附–脱附、氧脉冲吸附(OSC)、H₂–程序升温还原(H₂-TPR)及扫描电子显微镜(SEM)等方法对所制备的材料进行了表征. 研究结果表明, Nd₂O₃在CZA固溶体中的溶解限约为10wt%, 过量Nd的添加会出现分相形成Nd_0.5Ce_0.5O_1.75氧化物. 掺杂适量Nd能有效抑制氧化物晶粒的长大, 提高材料的热稳定性和氧化还原性能. Nd2O3的掺杂量为10wt%时, 样品的织构稳定性最好, 1000℃老化5 h后, 比表面积和孔容分别达97.14 m²/g和 0.44 mL/g. Nd₂O₃的掺杂量为7wt%时, 样品有高的储氧量, 经600℃和1000℃焙烧后储氧量分别为938.01 μmol/g和821.72 μmol/g; 体相氧的移动能力最强, 还原性能最佳, 老化后还原峰温由465℃升高到483℃. SEM结果表明, 所制备的材料均为球形颗粒, Nd₂O₃的添加可以有效阻止高温焙烧过程中粒子的团聚.

关键词: CeO₂-ZrO₂-Al₂O₃, Nd₂O₃, 织构性能, 氧化还原性能

Abstract: A series of CeO₂-ZrO₂-Al₂O₃(CZA) mixed oxides with Nd₂O₃ contents 0–13wt% were prepared by co-precipitation method and characterized by X-ray diffraction (XRD), N₂ adsorption-desorption at low temperature, oxygen pulsing technique (OSC), H₂-temperature programmed reduction (H₂-TPR) and scanning electrical microscope (SEM). The results show that the solubility limit of Nd₂O₃ in the CZA solid solution is about 10wt%. With excessive Nd dopant, the single phase will separate resulting in the formation of Nd_0.5Ce_0.5O_1.75 phase. Furthermore, the proper addition of Nd to CZA solid solution effectively restrains the sintering of oxide particles and greatly improves the thermal stability and redox property of the materials. When the doping amount of Nd₂O₃ in CZA solid solution is 10wt%, the sample has the best textural stability i.e. after calcination at 1000℃ for 5 h, the specific surface area and pore volume achieve 97.14 m²/g and 0.44 mL/g, respectively. For the CZA sample prepared with 7wt% Nd₂O₃ in CZA solid solution, the OSC is the highest in all samples, reaching 938.01 μmol/g and 821.72 μmol/g after calcination at 600℃ and 1000℃, respectively. Meanwhile, the mobility of bulk oxygen is the strongest and the sample has optimal reducibility at low temperature. After aging, the reduction peak temperature can be increased from 465℃ to 483℃. SEM image shows that all the prepared CZA samples have spherical particles and Nd₂O₃ can effectively prevent the agglomeration of particles in the process of high-temperature calcination.

Key words: CeO₂-ZrO₂-Al₂O₃, Nd2O3, textural property, redox property

中图分类号:

TB33
O643

彭娜, 陈山虎, 周菊发, 陈耀强, 龚茂初. 掺杂不同量Nd₂O₃对CeO₂-ZrO₂-Al₂O₃材料性能的影响[J]. 无机材料学报, 2012, 27(11): 1138-1144.

PENG Na, CHEN Shan-Hu, ZHOU Ju-Fa, CHEN Yao-Qiang, GONG Mao-Chu. Effect of Nd₂O₃ Doping Content on the Properties of CeO₂-ZrO₂-Al₂O₃[J]. Journal of Inorganic Materials, 2012, 27(11): 1138-1144.

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掺杂不同量Nd₂O₃对CeO₂-ZrO₂-Al₂O₃材料性能的影响

Effect of Nd₂O₃ Doping Content on the Properties of CeO₂-ZrO₂-Al₂O₃

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