Al-ITQ-13分子筛的快速合成及表征

Rapid Synthesis and Characterization of Al-ITQ-13 Zeolite

通过设计首次提出针对ITQ-13分子筛晶化促进剂的合成策略,ITQ-13分子筛.通过X射线粉末衍射(XRD)、扫描电子显微镜(SEM)、N2吸附、原位红外(FTIR)及固体核磁(27Al NMR)等测试手段对ITQ-13分子筛的物化性能进行了表征,考察了晶化过程中结晶度的变化,得出了晶化过程的动力学参数,对晶化机理进行了探讨.结果表明:快速合成法与传统方法合成的ITQ-13分子筛具有相似的物化性能,并且可以合成含有更多骨架铝的ITQ-13分子筛;NO3-的加入通过极化憎水基团,加速SiOSi物质结合,降低ITQ-13分子筛的成核活化能以及生长活化能,从而可以提高晶化速率,缩短晶化时间至11 h.

A new approach was first developed to synthesize Al-ITQ-13 zeolite in a short time via adding promoter in the initial gels. The samples were characterized by XRD,SEM,N2adsorption,FTIR,and27Al NMR methods. The kinetic parameters were obtained and the crystallization mechanism was discussed by the way of studying the changes of relative crystallity in the crystallization. It is showed that the physical properties of ITQ-13 synthesized by rapid synthesis method is similar to that synthesized by the traditional synthesis method. And ITQ-13 synthesized by rapid synthesis method contains more Al. The hydrophobic hydration spheres formed around silicate units was polarized by the promoter in the gel. And then the overlapping of SiOSi was facilitated. The ITQ-13 zeolite nucleation activation energy and growth activation energy was reduced so that the rate of crystallization was improved and the time of crystallization was shortened to 11 h.