Moteki Takahiko, Chaikittisilp Watcharop, Shimojima Atsushi, Okubo Tatsuya
Department of Chemical System Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.
J Am Chem Soc. 2008 Nov 26;130(47):15780-1. doi: 10.1021/ja806930h.
Novel pure silica sodalite with hollow sodalite-cages has been synthesized for the first time by topotactic conversion of layered silicate (RUB-15) precursor. This success has been achieved by stepwise syntheses from silicate monomers, through clusters and layers, to microporous crystals. The pretreatment of layered silicate with small carboxylic acids before conversion is a crucial step. The obtained sodalite possesses accessible micropores, as confirmed by physical adsorption of hydrogen molecules. This plate-like silica sodalite would be very promising as fillers in mixed-matrix membranes for hydrogen separation.
首次通过层状硅酸盐（RUB-15）前驱体的拓扑转化合成了具有中空方钠石笼的新型纯硅方钠石。这一成功是通过从硅酸盐单体逐步合成，经过簇和层，最终形成微孔晶体实现的。转化前用小羧酸对层状硅酸盐进行预处理是关键步骤。通过氢分子的物理吸附证实，所得方钠石具有可及的微孔。这种片状硅方钠石作为混合基质膜中用于氢气分离的填料将非常有前景。
