Crystal Growth of Faujasitic Microporous Zincophosphate Crystals Using Reverse Micelles as Reactants
Crystal Growth of Faujasitic Microporous Zincophosphate Crystals Using Reverse Micelles as Reactants
复制标题
使用反胶束作为反应物八面沸石微孔磷酸锌晶体的晶体生长
作者：
Ramsharan Singh and;P. Dutta
本文研究了含锌和含磷的反胶束体系中磷酸锌X的结晶过程。ZnPO-X与八面沸石(沸石X，Y)具有相同的拓扑结构。反胶束是在表面活性剂的帮助下稳定在碳氢化合物介质中的水滴。以阳离子表面活性剂二甲基二辛基氯化铵(DODMAC)、正十二醇为助表面活性剂、异辛烷为溶剂，制备了反胶束体系，成功地合成了ZnPO-X。反胶束水池中反应物的组成比常规水热合成的稀释度高约四倍。稀释是必要的，因为反胶束中的很大一部分水被用来使表面活性剂的头基水合。晶体出现时没有形成中间的非晶相。当锌和磷酸盐反胶束混合时，它们之间的碰撞导致反应物的交换。我们建议只有一小部分...
The present study deals with the crystallization of zincophosphate-X (ZnPO-X) from zinc- and phosphate-containing reverse micelles. ZnPO-X has the same topology as faujasite (zeolites X,Y). Reverse micelles are microdroplets of water stabilized in a hydrocarbon medium with the help of surfactants. Successful synthesis of ZnPO-X was possible using reverse micelles made with cationic surfactant dimethyldioctylammonium chloride (DODMAC), 1-decanol as cosurfactant and isooctane as solvent. The composition of the reactants in the water pools of the reverse micelles was about four times more dilute than that in a conventional hydrothermal synthesis. The dilution is necessary since a significant fraction of the water in the reverse micelles is used up for hydrating the headgroups of the surfactant. The crystals appear without the formation of an intermediate amorphous phase. Upon mixing the zinc and phosphate reverse micelles, collisions between them result in exchange of reactants. We propose that only a small ...