Structure Analysis of Si-Atom Pillared Lamellar Silicates Having Micropore Structure by Powder X-ray Diffraction
Structure Analysis of Si-Atom Pillared Lamellar Silicates Having Micropore Structure by Powder X-ray Diffraction
复制标题
DOI：
10.1021/jp912026n
复制
发表时间：
2010-02
影响因子：
3.7
通讯作者：
T. Ikeda;S. Kayamori;Y. Oumi;F. Mizukami
中科院分区：
文献类型：
--
作者：
T. Ikeda;S. Kayamori;Y. Oumi;F. Mizukami
在高压釜中，用HCl水溶液在443 K下热酸处理1−24 h，制备了4种硅原子柱撑层状硅酸盐（APZ-1−APZ-4）。层状硅酸盐PLS-1、PLS-3、PLS-4和PREFER由镁碱沸石层片组成，可以通过用SiO2（−OH）2片段柱撑夹层而转化为新的开放骨架微孔材料。碎片可能源自晶体结构的崩溃，并且随着碎片的迁移（溶解-缩合）发生层间甲硅烷基化。四个APZ晶体结构进行了研究，通过粉末X-射线衍射，揭示了拓扑结构的微孔结构，来自每个原始的层状硅酸盐。APZ-2和APZ-4具有12元环的大孔开口，而APZ-1和APZ-3具有10元环的略小的孔开口。所有APZ的亲水性与普通亲水性沸石的亲水性程度大致相同，这是由于APZ中的羟基基团。
Four kinds of Si-atom pillared lamellar silicates (APZ-1−APZ-4) were prepared by thermal acid treatment in an autoclave at 443 K for 1−24 h using aqueous HCl. Layered silicates PLS-1, PLS-3, PLS-4, and PREFER, which consist of ferrierite layer sheets, could be converted into new open-framework microporous materials by pillaring the interlayers with SiO2(−OH)2 fragments. The fragments probably originated from the collapse of the crystalline structure, and interlayer silylation occurred with the migration of the fragments (dissolution−condensation). The four APZ crystal structures were investigated by means of powder X-ray diffraction, revealing topotactic microporous structures that derived from each original layered silicate. APZ-2 and APZ-4 have the large pore openings of a 12-membered ring, whereas APZ-1 and APZ-3 have the slightly smaller pore openings of a 10-membered ring. All the APZs are hydrophilic to approximately the same degree as the common hydrophilic zeolite, owing to hydroxyl groups of the ...