作　　者： ; ; ;

机构地区： 华南理工大学材料科学与工程学院

出　　处： 《华南理工大学学报（自然科学版）》 2010年第4期83-86,共4页

摘　　要： 以偏高岭土兼作Al、Si源,H3PO4作磷源,十六烷基三甲基溴化铵(三乙醇胺为复合模板剂,采用分步晶化和一步晶化的方法制备磷酸硅铝分子筛.利用X射线衍射分析、扫描电镜、XPS及NH3-TPD等手段对产物进行了表征.结果表明:分步晶化法制备的磷酸硅铝分子筛晶粒规整,呈柱状,且晶粒尺寸较大,约为20μm×5μm×5μm,其晶体结构中P∶Al∶Si摩尔比达1∶1.19∶0.67,硅含量较高;采用分步晶化法制备的SAPO-5分子筛的总酸量更高,达578.0μmol/g;采用分步晶化法制备的SAPO-5分子筛的催化正丁烷异构化反应初始活性可达到24.8%,远高于一步晶化法制备的SAPO-5分子筛的初始活性(14.1%). Silicoaluminophosphate（SAPO-5） molecular sieves were synthesized respectively by the piecewise and one-step crystalline methods,with metakaolin as the silicon and aluminum sources,phosphoric acid as the phosphorus source and with triethylamine combined with hexadecyl trimethyl ammonium bromide as the template agent.Then,the prepared molecular sieves were characterized by means of XRD,SEM,XPS and NH3-TPD analysis.The results show that the product prepared by the piecewise crystalline method is of uniform pillar-like morphology,large size（about 20μm×5μm×5μm）,proper P∶Al∶Si molar ratio（1∶1.19∶0.67）,high Si content and higher total acid content（578.0μmol/g）,and that its initial activity（24.8%） is much higher than that of the product prepared by the one-step method（14.1%）.

关 键 词： 偏高岭土 晶化 磷酸硅铝分子筛 催化性能

领　　域： [化学工程]