首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
有序介孔La2Zr2O7的制备与表征
作者:刘瑞平1 苏伟明1 汪长安2 赵会友1 
单位:1. 中国矿业大学北京材料科学与工程系 北京 100083  2. 清华大学材料学院 新型陶瓷与精细工艺国家重点实验室 北京 100084 
关键词:锆酸镧 有序介孔 比表面积 热稳定性 
分类号:TB 32 文
出版年,卷(期):页码:2015,43(6):794-797
DOI:10.14062/j.issn.0454-5648.2015.06.14
摘要:

 以F127作为模板剂,通过溶剂蒸发诱导自组装法合成了具有有序孔结构、孔径分布均匀的介孔锆酸镧,系统研究了不同煅烧温度处理后介孔锆酸镧的相组成、比表面积、孔径及其分布以及微观结构。结果表明,经800 ℃处理后,样品开始晶化,完全晶化的样品中仅含锆酸镧相。经600 ℃煅烧后样品的比表面积为136 m2/g,孔体积为0.14 cm3/g,800 ℃煅烧后比表面积仍达90 m2/g,显示出较好的热稳定性。随着煅烧温度进一步升高,样品的比表面积和孔体积急剧减小,表明该方法制备的介孔锆酸镧最高耐热温度为800 ℃。透射电子显微镜观察发现,400 ℃去除模板后,样品具有有序介孔结构,预期其具有较好的催化性能。

doxycycline doxycycline doxycycline
amoxicillin amoxicillin amoxicillin
abortion pill abortion pill abortion pill

 The ordered mesoporous lanthanum zirconate was synthesized by an evaporation induced self-assembly (EISA) method with F127 as a template. The structure and textural properties were investigated. The results show that the crystallization temperature of the as-obtained powder is 800 ℃, and there is only lanthanum zirconate phase found in the well crystallized samples. The specific surface area and pore volume of the samples calcined at 600 ℃ are 136 m2/g and 0.14 cm3/g, respectively, and the specific surface area of the sample calcined at 800 ℃ is still 90 m2/g. The specific surface area and the pore volume of the samples decrease dramatically with further increasing the calcination temperature, indicating the optimum temperature at which the mesoporous lanthanum zirconate can be resist is 800 ℃. According to the images of transmission electron microscopy, the ordered mesopores appear after the removal of the template, giving the better catalytic properties.

基金项目:
国家自然科学基金(51172119 和51202117)资助项目。
作者简介:
刘瑞平(1983—),男,博士,副教授。
cialis coupon cialis coupon cialis coupon
参考文献:

 [1] KRESGE C T, LEONOWICZ M E, ROTH W J, et al. Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism[J]. Nature, 1992, 6397(359): 710–712.

[2] ZHAO Dongyuan, FENG Jianglin, HUO Qisheng, et al. Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores[J]. Science, 1998, 5350(279): 548–552.
[3] HUANG Fei, ZHENG Ying, CAI Guohui, et al. A new synthetic procedure for ordered mesoporous γ-alumina with a large surface area[J]. Scripta Mater, 2010, 63(3): 339–342.
[4] CAI Weiquan, YU Jiaguo, ANAND Chokkalingam, et al. Facile synthesis of ordered mesoporous alumina and alumina-supported metal oxides with tailored adsorption and framework properties[J]. Chem Mater, 2011, 23(5): 1147–1157.
[5] NIESZ Krisztian, YANG Peidong, GABOR A Somorjai. Sol-gel synthesis of ordered mesoporous alumina[J]. Chem Commun, 2005(15): 1986–1987.
[6] LIU Ruiping, WANG Chang-an. Synthesis of aluminum-doped mesoporous zirconia with improved thermal stability. Microporous and mesoporous materials[J]. Microporous Mesoporous Mater, 2014, 186(1): 1–6.
[7] MOHAMED Mokhtar, SULAIMAN N Basahel, TAREK T Ali. Effect of synthesis methods for mesoporous zirconia on its structural and textural properties[J]. J Mater Sci, 2013, 48(6): 2705–2713.
[8] HUNG Iming, FUNG Kuanzong, HUNG Detsai, et al. Thermal stability of ordered mesoporous yttria-stabilized zirconia[J]. J Eur Ceram Soc, 2008, 28(6): 1161–1167.
[9] SUN Qianping, ZHENG Ying, ZHENG Yong, et al. Synthesis of highly thermally stable lanthanum-doped ordered mesoporous alumina[J]. Script Mater, 2011, 65(11): 1026–1029.
[10] GAJJELA S R, ANANTHANARAYANAN K, YAP C, et al. Synthesis of mesoporous titanium dioxide by soft template based approach: characterization and application in dye-sensitized solar cells[J]. Energy Environ Sci, 2010, 3(6): 838–845.
[11] MORI M, TOMPSETT G M, SAMMES N M, et al. Compatibility of GdxTi2O7 pyrochlores (1.72≤x≤2.0) as electrolytes in high-temperature solid oxide fuel cells[J]. Solid State Ionics, 2003, 158(1): 79–90.
[12] XIE Y H, WANG J D, LIU R Q, et al. Preparation of La1.9Ca0.1Zr2O6.95 with pyrochlore structure and its application in synthesis of ammonia at atmospheric pressure[J]. Solid State Ionics, 2004, 168(1): 117–121.
bystolic copay card click bystolic coupon voucher
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com