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PFG NMR study of self-diffusion of low carbon chain length paraffins in carbonaceous adsorbents

1992; Elsevier BV; Volume: 152; Issue: 1 Linguagem: Inglês

10.1016/0021-9797(92)90027-j

1095-7103

Hansjörg Herden, Jörg Kärger, Harry Pfeifer, Christine Kube, R. Schöllner,

Advanced Neuroimaging Techniques and Applications

The molecular self-diffusion of different hydrocarbons in two activated carbons (ASA-H and CMS-H) was studied using pulsed-field gradient NMR. The estimated self-diffusion coefficients correspond with the half-width of the micropores of the used adsorbents and decrease with the increasing length of the hydrocarbon chain. In active carbon CMS-H the increase in activation energies with increasing molecular chain length is much more pronounced than in ASA-H.