Acta Phys. -Chim. Sin. ›› 1988, Vol. 4 ›› Issue (03): 250-255.doi: 10.3866/PKU.WHXB19880306

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NMR STUDY OF THE ADSORPTION OF HYDROCARBONS ON SEVERAL TYPICAL NATIVE CHARCOALS Ⅱ. 1H NMR Study of Adsorbed Benzene, Cyclohexane, n-Pentane and n-Hexane

Du Youru*; Shen Lianfang; Kong Yuhua; Hu Aiguo   

  1. Laboratory of Magnetic Resonance and Atomic and Molecular Physics; Wuhan Institute of Physics; Academia Sinica; P.O.Box 241; Wuhan; P.R.C
  • Received:1986-10-27 Revised:1987-04-08 Published:1988-06-15
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Abstract: Adsorption and desorption of benzene, cyclohexane, n-pentane and n-hexane on four native charcoals were measured. The adsorption behavior of the charcoals was interpreted with respect to the specific pore volume and pore size distribution by the ~1H NMR parameters measured, which showed that capillary condensation takes place in the micropores with radius less than 3.0 nm. The degree of high field shift of the adsorbed hydrocarbons gives a measure of the ratio between specific surface and specific pore volume, which may influence the adsorption capacity of the charcoal. Spin lattice relaxation time of the adsorbed hydrocarbons is independent on their species, but closely related to the total amount of the surface acid groups of the charcoal.