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用11B ,2 7Al,2 9Si,13 CMASNMR ,XRD ,IR技术详细研究了B2 O3 ·Al2 O3 ·SiO2 干凝胶在乙胺 /H2 O混合蒸气相中 ,固相转晶生成B Al ZSM 5沸石的过程和机理 .干胶中非网络的三配位硼氧基团在转晶过程中起着非常重要的作用 .结晶过程中Al原子周围的化学环境变化很复杂 ,干胶及最终沸石产物中都不存在的六配位铝只在半晶化产物中出现 .硅主要以羟基化合物形式存在于干胶中 ,反应过程中出现的非结构硅氧基团在完全晶化时消失 .既是反应物又是模板剂的乙胺分子通过氢键与干胶表面的硼羟基、铝羟基和硅羟基结合形成前驱体 ,促进了结晶过程 .经11BMASNMR和IR谱的测定 ,固相转晶生成的B Al ZSM 5沸石相对结晶度为 93%左右 .
The B2 O3 · Al2 O3 · SiO2 xerogel was mixed with ethylamine / H 2 O vapor phase by 11B, 27Al, 29Si, 13CMASNMR, XRD and IR techniques. The solid phase was transformed into B AlZSM 5 zeolite The process and mechanism of the non-network of dry glue three coordination boron oxygen group in the crystal transformation process plays a very important role in the crystallization process Al atoms around the chemical changes in the environment is very complex, dry glue and the final zeolite product Hexacoordinated aluminum, which is absent, appears only in the semicrystalline product, which exists mainly in the form of a hydroxyl compound in the dry gel, and the unstructured siloxy groups that occur during the reaction disappear upon complete crystallization. The ethylamine molecule, which is a template agent, also promotes the crystallization process by hydrogen bonding with boron hydroxy, aluminum hydroxyl and silanol groups on the surface of the dried rubber, which promotes the crystallization process.BAl determined by 11BMASNMR and IR spectroscopy, ZSM 5 zeolite relative crystallinity of about 93%.