邻苯二酚做螯合剂合成不同粒度、形貌的全硅方钠石分子筛大单晶

Synthesis of large single crystals of silica-sodalite zeolites with variable size and morphology

将邻苯二酚作为螯合剂加入到合成全硅方钠石分子筛的体系 (SiO2-NaOH -EG -R(R :邻苯二酚 ) )中 ,合成了 15 μm× 15 μm× 15 μm～ 6 0 μm×6 0 μm× 6 0 μm粒度不等的高质量的Si-SOD分子筛单晶 .实验结果表明 :当体系中有邻苯二酚存在时得到的产物具有较大尺寸和完美形貌的单晶 ,而不加邻苯二酚时却得到尺寸很小的孪晶 ;同时 ,体系中邻苯二酚的含量对晶体的粒度也有很大影响 .晶化动力学表明 ,邻苯二酚的加入极大地降低了晶化速度 ,这可能与体系中形成了硅

By adding pyrocatechol as a complex agent for silicon into the system:SiO 2-EG-NaOH-R(R:pyrocatechol), single crytals of zeolites silica-sodalite with different crystallite sizes ranging from 15 μm×15 μm×15 μm to 60 μm×60 μm×60 μm were obtained. Experimental results showed that the crystals synthesized in the presence of pyrocatechol have much larger size and better morphology than those synthesized in the absence of pyrocatechol, and their sizes were largely influenced by the content of pyrocatechol in the reaction system.