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以具有一定活性的偏高岭土兼作铝源与硅源、正磷酸作磷源、三乙醇胺和十六烷基三甲基溴化铵为复合模板剂,于473K水热反应16h合成了高硅SAPO-5分子筛。利用X射线衍射、Fourier变换红外光谱、扫描电镜、29Si,27Al固态核磁共振和能谱分析等手段对产物结构进行了表征。结果表明:采用十六烷基三甲基溴化铵复合三乙醇胺作模板剂,可以促进SAPO-5晶体产物的形成。在473K下,晶化时间为16h时,可得到结晶度较高的SAPO-5晶体,其形貌为尺寸大约为20μm×5μm×5μm的规则柱状晶体,结构中Si与Al的摩尔比为0.55,在间二甲苯异构化反应中具有较高的催化活性。
With a certain activity of metakaolin as both aluminum source and silicon source, orthophosphoric acid as phosphorus source, triethanolamine and cetyltrimethylammonium bromide as a complex template agent, at 473K hydrothermal reaction 16h synthesis of high-silica SAPO- 5 molecular sieve. The structure of the product was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, 29Si, 27Al solid-state nuclear magnetic resonance and energy spectrum analysis. The results showed that the formation of SAPO-5 crystals could be promoted by using cetyltrimethylammonium bromide and triethanolamine as templating agents. At 473K, the crystallization time is 16h, SAPO-5 crystals with high crystallinity can be obtained. The morphologies of the crystals are regular columnar crystals with the size of about 20μm × 5μm × 5μm. The molar ratio of Si to Al in the structure is 0.55 , In meta-xylene isomerization reaction has a high catalytic activity.