Bead-Milling and Postmilling Recrystallization: An Organic Template-free Methodology for the Production of Nano-zeolites
Bead-Milling and Postmilling Recrystallization: An Organic Template-free Methodology for the Production of Nano-zeolites
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DOI：
10.1021/cg2001656
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发表时间：
2011-03
影响因子：
3.8
通讯作者：
T. Wakihara;R. Ichikawa;Junichi Tatami;A. Endo;Kaname Yoshida;Y. Sasaki;K. Komeya;T. Meguro
中科院分区：
文献类型：
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作者：
T. Wakihara;R. Ichikawa;Junichi Tatami;A. Endo;Kaname Yoshida;Y. Sasaki;K. Komeya;T. Meguro
无模板剂合成纳米沸石分子筛是一个重要的科学和工业应用课题。大部分研究集中在通过自下而上的方法制备纳米沸石，即在水热合成过程中控制沸石成核和晶体生长。该通信报告了一种通过自上而下的方法生产纳米沸石粉的新方法。在这项研究中，首先研磨沸石以产生纳米粉末。该技术可导致沸石骨架的外部部分的破坏，并因此导致孔堵塞，这使沸石的各种性质失活。为了补救这一点，在珠磨之后使用稀铝硅酸盐溶液使受损部件再结晶。采用球磨和球磨后重结晶相结合的方法，成功地制备出了粒径约50 nm、结晶度高的纳米A型分子筛（LTA型分子筛）。
Organic template-free synthesis of nano-zeolite has been an important subject of both scientific and industrial applications. Most research has focused on the fabrication of nano-zeolite by a bottom up approach, that is, control of zeolite nucleation and crystal growth during the hydrothermal synthesis. This communication reports a new method for the production of nano-zeolite powder by a top-down approach. In this study, the zeolite was first milled to produce a nanopowder. This technique can cause destruction of the outer portion of the zeolite framework and hence cause pore blocking, which deactivates various properties of the zeolite. To remedy this, the damaged part was recrystallized using a dilute aluminosilicate solution after bead milling. As a result of the combination of bead milling and postmilling recrystallization, nano-zeolite A (LTA type zeolite) about 50 nm in size with high crystallinity was successfully obtained.