在无模板剂存在下,以硅酸钠为硅源采用简单的变温两步法,通过控制高温预晶化时间,在转动烘箱中成功合成了小颗粒ZSM-5沸石团聚体.高温预晶化是为了加快反应液的成核,而低温晶化足为了获得小的分子筛晶体.运用X射线衍射,扫描电镜,NH3程序升温脱附和N2吸附-脱附等技术对合成的ZSM-5沸石进行了表征.与一步法合成的微米级颗粒相比较,两步法合成的小颗粒团聚体ZSM-5沸石具有较高比表面积和相同酸量.得到的沸石的Br(o)nsted酸位占主要部分,Lewis酸位较少,也说明Al基本进入沸石骨架中.
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