The 1H NMR and 13C NMR spectra were obtained for TMS and hexane adsorbed on mol. sieve NaY, Al2O3 and SiO2 by using a JEOL FX-90Q NMR spectrometer. The results showed that this instrumentation normally used for liquid sample was suitable for the studies of some adsorption systems. A comparison made between 31C NMR and 1H NMR spectra found that 13C NMR spectroscopy possesses several advantages over 1H NMR spectroscopy with respect to resoln. Paramagnetic impurities produce crit. effects on line widths. The adsorption rate of C2H4 on NaY surface was decreased significantly by preadsorbing H on the same sample.

Key words: SURFACE OF SOLIDS, ALUMINIUM OXIDE, ETHYLENE, HYDROGEN, ADSORPTION, NMR SPECTROMETRY, C13 NMR SPECTROMETRY, MOLECULAR SIEVE, ABSORPTION EQUILIBRIUM, SPECIFIC SURFACE AREA