模板剂对SAPO-11的物化及异构性能的影响  

Effect of template content on the physicochemical characterization and catalytic performance of SAPO-11 for the hydroisomerization of n-tetradecane

作　　者：刘平[1,2] 任杰[1] 孙予罕[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001 [2]中国科学院研究生院,北京100039

出　　处：《燃料化学学报》2008年第5期610-615,共6页Journal of Fuel Chemistry and Technology

基　　金：国家重点基础研究发展规划(973计划,2005cb221402)

摘　　要：采用水热合成法,以二正丙胺(DPA)和二异丙胺(DIPA)混合物为模板剂合成SAPO-11分子筛,考察了模板剂用量和混合模板剂中DPA和DIPA配比对所得产物的影响,并通过XRD、N2吸附、NH3-TPD和29Si MAS NMR等手段对样品进行了表征。结果表明,改变模板剂用量和配比不仅可以调节SAPO-11结晶度,还会改变Si在分子筛骨架上的分布,从而调节SAPO-11的酸性。当模板剂用量比为1.5,模板剂中DPA的质量分数为66%时,样品的Si区面积最小,Si(nAl)(0<n<4)结构最多。因此,分子筛酸性和对正十四烷异构活性也最高。Different SAPO-11 have been synthesized hydrothermally using the mixed template of di-n-propylamine （DPA） and di-iso-propylamine （DIPA） by varying the template content or the ratio of DPA/DIPA. Products were characterized using X-ray diffraction （XRD）, N2 adsorption, NH3-temperature-programed desorption （TPD） and 29Si MAS NMR, and evaluated towards n-tetradecane skeletal isomerization. The results indicated that the template had strong influence on the crystallinity, the Si distribution and thus the acidity of SAPO-11. The sample prepared at template content of 1.5 and w （DPA） of 66% possessed small silicon domains and large amount of Si（ n A1） （0 〈 n 〈 4 ） sites, and the catalyst obtained with this method performed highest catalytic activity in the hydroisomerization of n-tetradecane due to the high acidity.

关 键 词：SAPO—11分子筛 水热合成 模板剂用量 模板剂配比 ^29Si MAS NMR 临氢异构 

分 类 号：TE624.93[石油与天然气工程—油气加工工程]