ANOMALOUS CHEMICAL-SHIFTS OF BENZENE ON SPHERICAL CARBON ADSORBENTS

It is found that benzene, adsorbed on spherical carbon. adsorbents (SCA) thermally processed at 1273 K and above, manifests in PMR spectra in a form of two signals characterized by anomalous values of chemical shift: delta=0 and delta=-10 ppm. Spectral characteristics. of benzene adsorbed from the vapour phase at pressures p/p(s) equal 0.95, 0.666 and 0.106 and temperature 293 K have been compared with the spectra of benzene obtained at freezing of the liquid phase, It is established that the signal with chemical shift delta=-10 ppm. is conditioned by benzene molecules in micropores, while the signal with delta=0 - by benzene bound to the surface in the pores of the larger size.