燃料化学学报2018，Vol.46Issue(6)：700-709,10.
以SBA-15为硅源合成多级孔SAPO-11分子筛及其在正十二烷临氢异构化中的应用
Hierarchical SAPO-11 prepared using SBA-15 as the silicon source and its application in n-dodecane hydroisomerization
摘要
Abstract
SBA-15 with the removal of template agent, which served as both the silicon source and indirect template agent, was used to hydrothermally synthesize hierarchical SAPO-11 molecular sieve.The crystal structure, morphology, acidity and texture of the samples were characterized by XRD, SEM, FT-IR and N2 physical adsorption.The results showed that the pure SAPO-11 can be obtained by using calcined SBA-15 as the silicon source.At the same time, SBA-15 was completely transformed in the synthesis system.The obtained SAPO-11 sample showed a hollow near-column shape with particle size of about 1-3 μm,which was composed of bar-shape structure with a width of about 100 nm.Compared with conventional SAPO-11 synthesized by adopting white carbon black or colloidal silica as the silicon source, the addition of SBA-15 successfully introduced mesoporous channels with pore size of 5-10 nm into SAPO-11 molecular sieve.Moreover, the proportion of moderate and strong Br?nsted acid was larger than that of weak Br?nsted acid.Finally, the catalytic behaviors of Pt/SAPO-11 bifunctional catalysts were investigated in the hydroisomerization of n-dodecane.The results indicated that the hierarchical catalyst synthesized with SBA-15 was much more active and selective.The excellent isomerization performance was closely related to the acidity and pore structure of the hierarchical SAPO-11 molecular sieve.The increase of moderate and strong Br?nsted acidity contributed to the improvement of activity.Meanwhile,the mesopores were conducive to the significant increase of selectivity via accelerating diffusion of the isomerization products.关键词
SAPO-11/SBA-15/多级孔/酸性/异构化Key words
SAPO-11/SBA-15/hierarchical/Brønsted acid/hydroisomerization分类
化学化工引用本文复制引用
赵思梦,林明桂,郗宏娟,陈晓燕,王俊刚,贾丽涛,李德宝,侯博..以SBA-15为硅源合成多级孔SAPO-11分子筛及其在正十二烷临氢异构化中的应用[J].燃料化学学报,2018,46(6):700-709,10.基金项目
The project was supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA07070700).中国科学院战略性先导科技专项(XDA07070700)资助 （XDA07070700）
