β沸石堆垛层错结构的研究  

Studies on the Stacking Fault Structure in Zeolite Beta

作　　者：孟宪平[1] 王颖霞[1] 韦承谦[2] 张婉静[1] 林炳雄[1] 刘希尧[3] 

机构地区：[1]北京大学物理化学研究所,北京100871 [2]广西大学化学系,南宁530004 [3]北京燕山石油化工公司研究院,北京102549

出　　处：《物理化学学报》1996年第8期727-734,共8页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金;博士后基金

摘　　要：含TEA＋离子的化合物作为模板剂会成的β沸石是由有序结构A、B、C到沿[001]方向堆积成堆垛层错结构．三种有序结构出现的几率分别为0．31、0．36和0．33；其数值不受样品中硅铝出的影响．几率值如此相近的原因是构成β沸石的结构单元Ⅰ的四种连接方式（见图2）能量相等.几率值之间的微小差别,是基于在晶体生长过程中支撑赶A、B和C型三维通道结构的TEA＋离子以不同排列形成的难易程度不同所引起．B型对应的排列略易于C型、C型又略易于A型，因此使用此种模板剂时，A、B、C三种结构均可能出现，只能合成出具有堆垛层错结构的β沸石．由于三维通道的特点，合成β沸石对模板剂的用量必须大于具有二维通道或一维通道的分子筛合成时的用量．而且要求有机控离子不宜过大、反应温度相对较低、晶化时间相对较长。The framework topology of zeolite beta containing TEA+ compounds as templates is that A, B and C three ordered polytypes, pile up stacking fault structure along [001] orientation. The probability of A, B and C polytypes appeared in zeolite beta is 0.31, 0.36 and 0.33 respectively and does not change with the ratio of silica to alumina.Owing to the four connected modes of building unit I that formed framework of zeolite beta having the same energy, the above probability values come near. In the course of crystal growth the arrangement of TEA+ which sustains the three dimensional channel of the A, B and C is different. The little difference among probability values stems from the fact that the arrangement of B is easier than that of C and the arrangement of C is easier than that of A. Using this template, only zeolite beta with starking fault structure can be synthesized. In the case, the necessary amount of template is more than that for molecular sieves with two or one dimensional channels and smaller templating molecule,lower reaction temperaturc and longer crystallization time are advantageous.

关 键 词：Β沸石 堆垛层错 模板剂 四乙基铵离子 沸石 

分 类 号：TQ424.25[化学工程]