摘要
采用1H→13 CCP/MASNMR跟踪研究了模板剂TPAOH在晶化过程中的作用。结果表明 ,在晶化初期 ,TPA+ 以吸附带有负电荷的硅钛胶聚合体为主 ,硅钛相互作用逐渐形成微小晶核 ,这种微小晶核缓慢长大进而形成分子筛 ;用1H→2 9SiCP/MASNMR增强钛硅分子筛晶化过程中2 9Si分辩信号 ,效果显著。在钛与硅氧作用形成具有复杂结构的微小晶核时 ,钛对硅的影响作用较小 ;当微小晶核突发形成分子筛时 ,钛进入分子筛骨架 ,对硅的影响作用显著增大。初步探讨了钛硅分子晶化生成分子筛的晶化机理。
H→ 13 C CP/MAS NMR spectroscopy was used to trace the template role of TPAOH in the process of forming titanium silicalite molecular sieve.The TPA + ion adsorbed the inorganic polymers of titanium and silicalite by negative electric charge in incipient crystallization.These polymers inter acted to form the mini crystalline substance through the TPA + function.The titanium silicalite molecular sieve was then formed with the growing of the mini crystalline substance. 1H→ 29 Si CP/MAS NMR spectroscopy was employed to characterize the mini crystalline substance in the crystallization of titanium silicalite molecular sieve in order to enhance the 29 Si differentiate signal.The interactions between Ti and Si were investigated.The crystallization mechanism of titanium silicalite molecular sieve was also discussed.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2003年第3期33-37,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家重点基础研究发展规划资助项目 ( 973 G2 0 0 0 0 480 0 5 )
关键词
钛硅分子筛
晶化
表征
核磁共振
titanium silicalite molecular sieve
crystallization
characterization
NMR spectroscopy
