Phase transformation and morphology control of zeolite LZ-277 with alkaline media in Na2O-Al2O3-SiO2-H2O system
Phase transformation and morphology control of zeolite LZ-277 with alkaline media in Na2O-Al2O3-SiO2-H2O system
复制标题
Na2O-Al2O3-SiO2-H2O体系中碱性介质中LZ-277沸石的相变及形貌控制
DOI：
10.1016/j.micromeso.2014.09.007
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发表时间：
2015
影响因子：
5.2
通讯作者：
Bai Shiyang
中科院分区：
文献类型：
--
作者：
Ren Bo;Sun Jihong;Bai Shiyang
采用含结构导向剂的水热法，从无机凝胶体系合成了LZ-277沸石。采用粉末X射线衍射(XRD)、扫描电子显微镜(SEM)、X射线荧光(XRF)、氮气吸附-脱附等温线和热重/差热分析(TGA/DTA)等技术对样品的结构特征和织构性能进行了表征。为了获得沙漠玫瑰形状的纯净LZ-277分子筛，我们系统地考察了起始凝胶的pH值对其结晶性能的影响。结果表明，在低碱度条件下形成的无定形相可通过提高起始凝胶的pH值至11.8转化为纯净的LZ-277沸石。然而，当pH值增加到12.8时，会产生额外的FAU型沸石相，当pH值增加到13.3时，最终会产生方钠沸石晶体结构。此外，为了评价其潜在的应用价值，采用离子交换法、X射线衍射法、透射电子显微镜和热重/差热分析等方法对氨交换LZ-277的热稳定性进行了初步研究。
Zeolite LZ-277 has been synthesized from inorganic gel system via a hydrothermal method involving structure-directing agents. The structural features and textural properties of the obtained samples were extensively characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF), N2adsorption–desorption isotherms and thermogravimetric analysis/differential thermal analysis (TGA/DTA) techniques. In an effort to obtain pure zeolite LZ-277 with desert rose-like spherical morphology, we have systematically investigated the influence of pH value of starting gel on the crystallization performance. It was found that the amorphous phase, formed under low alkalinity conditions, could be transformed to pure zeolite LZ-277 by increasing the pH value of the starting gel to 11.8. However, an additional phase of FAU-type zeolite was generated when the pH value was increased to 12.8, and the sodalite crystal structure was eventually produced when the pH value reached 13.3. In addition, in order to evaluate its potential application, the thermostability of ammonium-exchanged LZ-277 was preliminary investigated using ion exchange methods, XRD, TEM and TGA/DTA analyses.
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影响因子：
7.3
作者：
M. Santikunaporn;J. Herrera;S. Jongpatiwut;D. Resasco;W. Alvarez;E. L. Sughrue
通讯作者：
M. Santikunaporn;J. Herrera;S. Jongpatiwut;D. Resasco;W. Alvarez;E. L. Sughrue
影响因子：
--
作者：
Meng;Tan;Danishefsky
通讯作者：
Meng;Tan;Danishefsky
影响因子：
7.3
作者：
A. P. Bolton;M. Lanewala
通讯作者：
A. P. Bolton;M. Lanewala
DOI：
10.1016/0144-2449(91)80299-f
发表时间：
1991-04
期刊：
Zeolites
影响因子：
--
作者：
M. J. Franco;J. Pérez-Pariente;V. Fornés
通讯作者：
M. J. Franco;J. Pérez-Pariente;V. Fornés
DOI：
10.1039/ft9928802791
发表时间：
1992
期刊：
Journal of the Chemical Society, Faraday Transactions
影响因子：
--
作者：
R. Lobo;M. Annen;Mark E. Davis
通讯作者：
R. Lobo;M. Annen;Mark E. Davis