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水热处理异丙醇铝及其煅烧产物的显微结构
作者:刘超 王晶 杨雨佳 
单位:大连交通大学 辽宁省无机超细粉体制备及应用重点实验室 辽宁 大连 116028 
关键词:薄水铝石 水热处理 异丙醇铝 结晶化 α-氧化铝 
分类号:TQ133.1
出版年,卷(期):页码:2014,42(12):1554-1559
DOI:10.7521/j.issn.0454-5648. 2014. 12.13
摘要:

 以异丙醇铝为原料,经水热处理获得菱形片状薄水铝石。利用X射线衍射、Fourier变换红外光谱和透射电子显微镜研究了水热温度及煅烧温度对产物相结构及微观形貌的影响。结果表明,随水热处理温度的提高,产物由结晶性能较差的拟薄水铝石向结晶性良好的薄水铝石相转变,表明水热处理提高了产物晶体结构的对称性,使其非对称伸缩受到限制,而对称性伸缩得到增强。未经水热处理的产物呈褶皱的纳米薄片交联在一起的无规则团聚结构,经水热处理的产物逐渐向规则的菱形片状形貌转变,随水热处理温度升高,片状产物的厚度增大。水热处理影响煅烧产物的热稳定,随水热处理温度提高,α­Al2O3出现的温度提高,表明煅烧过程中中间相的热稳定性得到提高,同时α­Al2O3出现是在θ­Al2O3相晶格中发生层错产生的。

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  Rhombic plate­like boehmite was synthesized via hydrothermal treatment and subsequent calcinating with aluminum isopropoxide as a raw material. The effects of hydrothermal treatment and calcinating temperature on the microstructure of as­synthesized products were characterized by X­ray powder diffraction, Fourier transform infrared spectroscopy and transmission electron microscopy, respectively. The results show that the phase of the products changes from a poor­crystalline boehmite to a well­crystalline boehmite when hydrothermal temperature increases. The symmetry of the crystal structure is improved after the hydrothermal treatment, and the asymmetric stretch is restricted but the symmetric stretch is enhanced. The product obtained without the hydrothermal treatment exhibits a crosslinked structure with wrinkle nano­sheets. The morphology of the product gradually becomes a regular rhombic plate and the thickness is thicker with increasing the hydrothermal temperature. The thermal stability of the calcinated product is also affected by the hydrothermal treatment. The phase transition temperature of α­Al2O3 increases and the thermal stability of the intermediate phase in the calcinating process improves when the hydrothermal temperature increases. Meanwhile, α­Al2O3 phase appears in θ­Al2O3 phase lattice generated due to the stacking fault.

 
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基金项目:
基金项目:国家自然科学基金重点项目(51274052)资助。
作者简介:
第一作者:刘 超(1989—),男,硕士研究生。 通信作者:王 晶(1967—),女,博士,教授。
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参考文献:

 参考文献:

[1] KOTANIGAWA T, YAMAMOTO M, UTIYAMA M. The influence of preparation methods on the pore structure of alumina[J]. Appl Catal A­Gen, 1981, 1(3/4):185­200.
[2] ISLAM M A, MING Chuchi, RAVINDRA P, et al. Rheology and gelling behavior of boehmite sols[J]. J Appl Sci, 2011, 11(13):2327­2333.
[3] LI Lele, DUAN Wentao, YUAN Quan, et al. Hierarchical γ­Al2O3 monoliths with highly ordered 2D hexagonal mesopores in macroporous walls[J]. Chem Commun, 2009: 6174­6176.
[4] BACHELARD R, BARRAL R. High purity alumina mfr. From ammonium alum­which is dehydrated by heating, and then calcined while gas or air steam removes gaseous reaction prods [P]. FR2486058. 1980­01­08.
[5] EDWARD S M, WEAVER M L. Synthesis and properties of high­purity alumina[J]. Am Ceram Soc Bull, 1993, 72(7): 71­77.
[6] 常玉芬, 沈国良, 宁桂玲, 等. 异丙醇体系中多形态氧化铝纳米粒子的制备研究[J]. 材料科学与工程学报, 2004, 22(2): 172­174.
   CHANG Yufen, SHEN Guoliang, NING Guiling, et al. J Mater Sci(in Chinese),2004, 22(2): 172­174.
[7] 李俊诚, 向兰, 冯旭, 等. 水热改性对氧化铝载体织构和表面性质的影响[J]. 无机化学学报, 2005, 21(2): 212­216.
   LI Juncheng, XIANG Lan, FENG Xu, et al. J Inorg Chem(in Chinese), 2005, 21(2): 212­216.
[8] EROL S, ERDOGAN G. Activity and N2 selectivity of sol­gel prepared Pt/alumina catalysts for selective NOx reduction[J]. J Catal, 2000, 194(1): 4­13.
[9] BOKHIMI X, SAHNCHEZ V J, PEDRAZA F. Crystallization of sol­gel boehmite via hydrothermal annealing[J]. J Solid State Chem, 2002, 166(1): 182­190.
[10] LIU Jing, HUANG Fuming, LIAO Xuepin, et al. Synthesis of thermally stable mesoporus alumina by using bayberry tannin as temolate in aqyeiys system[J]. B Kor Chem Soc, 2013, 34(9): 2650­2656.
[11] BROWN I W M, BOWDEN M E, KEMMITT T, et al. Structural and thermal characterisation of nanostructured alumina templates[J]. Curr Appl Phys, 2006, 6(1): 557­561.
[12] SUN Qianping, ZHENG Ying, ZHENG Yong, et al. Synthesis of highly thermally stable lanthanum­doped ordered mesoporous alumina[J]. Scr Mater, 2011, 65(11): 1026­1029.
[13] LIPPENS B G, STEGGERDA J J. Physical and chemical aspects of adsorbents and catalysts[M]. London:Acadimic press, 1970: 171­211.
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