摘要
用1 3CHPDECMASNMR与热分析方法表征了在四氢呋喃 (THF) Na2 O SiO2 Al2 O3 H2 O体系中水热合成的高硅Na THF FER沸石、酸交换后的H THF FER沸石以及吸附于Na FER和H FER沸石中的THF .结果证明 ,模板剂分子THF位于Na THF FER沸石骨架的FER笼内 ,平衡骨架阳离子Na+ 主要存在于十元环孔道 ;而吸附于FER沸石中的THF仅处于十元环孔道中 .合成样品中THF的化学位移与液态THF相比 ,向低场移动 ,谱线明显变宽 。
C HPDEC MAS NMR, adsorption and TG/DTG/DTA were used to investigate a high-silica Na-THF-FER zeolite synthesized in the reactant system of tetrahydrofuran (THF)-Na 2O-SiO 2-Al 2O 3-H 2O, H-THF-FER zeolite obtained by acid-exchange, and the THF absorbed in Na-FER and H-FER zeolite. The results indicate that the template molecules of THF are trapped in FER cages, while sodium cations locate in 10 MR channels of the as-synthesized zeolite. The THF molecules absorbed in FER zeolites only lie in 10 MR channels. Compared with THF in liquid state, the 13C chemical shifts of the THF in the as-synthesized FER zeolite move to low field, especially for the resonance of 1-C (connected to the oxygen atom). Moreover, the spectra of the as-synthesized Na-THF-FER zeolite are broadened obviously, showing that the molecules of THF trapped in FER cages strongly interact with the framework of the zeolite.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2003年第2期236-239,共4页
Acta Chimica Sinica
基金
国家自然科学基金 (No.2 0 0 730 1 0 )
教育部博士点基金资助项目
