Single parameter synthesis of high silica CHA zeolites from fluoride media
Single parameter synthesis of high silica CHA zeolites from fluoride media
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DOI：
10.1016/j.micromeso.2011.12.026
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发表时间：
2012-05-01
影响因子：
5.2
通讯作者：
Lillerud, Karl P.
中科院分区：
文献类型：
--
作者：
Eilertsen, Einar A.;Arstad, Bjornar;Lillerud, Karl P.
在氟化物介质中，以N，N，N-1-三甲基金刚烷氢氧化铵为结构导向剂，合成了一系列仅改变硅铝比的高硅CHA沸石。该材料已被合成为具有高结晶度，并且具有范围从20到无穷大的Si/Al比，即纯SiO2。粉末XRD表明，晶胞参数随骨架中Al含量的增加而增大，BET和SEM表明，比表面积和粒径与Si/Al比无关。我们还提出了一个解释，早先报道的分歧，Si/Al比确定元素分析和Si-29 MAS NMR。(C)2011 Elsevier Inc. All rights reserved.
A series of high silica CHA zeolites with a true single parameter variation has been synthesized, where only the Si/AI ratio changes, using N,N,N-1-trimethyladamantammonium hydroxide as the structure directing agent in fluoride media. The materials have been synthesized with high crystallinity, and with a Si/AI ratio ranging from 20 to infinity, i.e. pure SiO2. Powder XRD shows that the unit cell parameters increase with increasing amount of Al incorporated into the framework, while BET and SEM shows that the specific surface area and the particle size is fairly independent of the Si/AI ratio. We also present an explanation for the earlier reported disagreement in Si/AI ratio determined by elemental analysis and Si-29 MAS NMR. (C) 2011 Elsevier Inc. All rights reserved.