13C 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-Si0-2-Al20-3-H20, 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 C~13 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

Key words: ZEOLITE, TEMPLATE AGENT, TETRAHYDROFURAN, HYDRO-THERMAL REACTION, MOLECULAR SIEVE, CATALYST, CHEMICAL SHIFT