CRYSTALLINE ZEOLITES .1. THE PROPERTIES OF A NEW SYNTHETIC ZEOLITE, TYPE-A
CRYSTALLINE ZEOLITES .1. THE PROPERTIES OF A NEW SYNTHETIC ZEOLITE, TYPE-A
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DOI：
10.1021/ja01604a001
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发表时间：
1956-01-01
影响因子：
15
通讯作者：
THOMAS, TL
中科院分区：
文献类型：
--
作者：
BRECK, DW;EVERSOLE, WG;THOMAS, TL
描述了一种新型沸石——水合结晶铝硅酸钠的性质，并公布了14种新型沸石的合成和35种沸石中6种沸石的合成。新型分子筛为A型，分子式为：Nai2 [(A102) i2 (Si02) i2]-27H20。该结构为立方结构，0= 12.32 A，空间群为i- pm3m，其特征是由直径11.4 A的空腔组成的三维网络，由圆形开口分隔4。2. 直径为A。除去结晶水，留下一个稳定的结晶固体，其中含有相互连接的晶内空隙，占沸石体积的45%。生产出一种高容量吸附剂，它可以很容易地封闭一定大小和形状的分子，而排除其他大小和形状的分子。钠离子可进入晶内空隙或孔洞，在水溶液中容易进行阳离子交换。钙离子取代钠离子有效地扩大了孔开度，因此直链烃容易被吸附，支链烃被排除在外。
The properties of a new zeolite, a hydrated crystalline sodium aluminosilicate, are described and the syntheses of 14 new zeolite species and 6 of the 35 known zeolites are announced. The new zeolite, designated type A, is represented by the formula: Nai2 [(A102) i2 (Si02) i2]-27H20. The structure is cubic, o0= 12.32 A., space group Oi-Pm3m, and is characterized by a 3-dimensional network consisting of cavities 11.4 A. in diameter separated by circular openings4. 2. A in diameter. Removal of the crystal water leaves a stable crystalline solid containing mutually connected intracrystalline voids amounting to 45 vol.% of the zeolite. A high capacity adsorbent is produced which readily occludes molecules of a certain size and shape but excludes others. Sodium ions, accessible to the intracrystalline voids or pores, undergo cation exchange readily in aqueous solution. Replacement of sodium ions by calcium ions effectively enlarges the pore openings so straight chain hy-drocarbons are readily adsorbed but branched chain hydrocarbons are excluded.