| 尹建军.ZSM-5分子筛结晶度及晶粒大小的影响因素[J].分子催化,2012,(2):162-168 |
| ZSM-5分子筛结晶度及晶粒大小的影响因素 |
| The Influence Factors of the Crystallinity and Crystal Size of ZSM-5 Zeolite |
| 投稿时间：2012-02-24 修订日期：2012-04-14 |
| DOI： |
| 中文关键词: ZSM-5分子筛 结晶度 晶粒大小 硅铝酸盐凝胶 |
| 英文关键词:ZSM-5 zeolite, crystallinity, crystal size,aluminosilicate gel |
| 基金项目: |
|
| 摘要点击次数: 2119 |
| 全文下载次数: 8372 |
| 中文摘要: |
| 摘 要：以硅溶胶为硅源，偏铝酸钠为铝源，用晶种法制备ZSM-5分子筛。考察了物料混合方式、陈化时间、晶化时间、晶化温度、碱度和水量等对ZSM-5分子筛相对结晶度和晶粒大小的影响。用X射线衍射仪（XRD）、扫描电子显微镜（SEM）和激光粒度分析等对所合成样品进行了表征。结果表明：在一定的高碱度条件下形成高浓度的硅铝酸盐凝胶，才能合成出晶化良好的样品，ZSM-5分子筛是按固相机理形成的；合成ZSM-5分子筛的相对结晶度和平均颗粒度均随晶化温度的升高及硅铝酸盐凝胶浓度的增加而增大，在室温陈化24h、180℃晶化24h时相对结晶度最高，平均颗粒度基本上与陈化时间无关。 |
| 英文摘要: |
| Abstract: ZSM-5 zeolite was synthesized by seeding technique using silica sol and aluminum sulfate as raw materials. The effects of key factors, such as the mixing modes of material ,aging time, crystallization temperature, crystallization time , alkalinity and dosage of H2O on the crystallinity and crystal size were investigated. The samples were characterized by XRD, SEM and LPSA etc. The result indicated that the high crystallinity ZSM-5 zeolite can only be synthesized with the high concentration aluminosilicate gel formed in the condition of certain high alkalinity. ZSM-5 zeolite crystallization proceeds is based on the solid-solid transformations mechanism. The higher of the crystallization temperature and the concentration of aluminosilicate gel, the higher of the relative crystallinity and average particle size, the sample of the highest crystallinity can be synthesized with the aging time of 24h at room temperature and the crystallization time of 24h at 180℃, the aging time have a small influence on the crystal size. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
