ISSN:
0749-1581
Schlagwort(e):
Adsorption NMR
;
Charcoal
;
Alcohols
;
Chemistry
;
Analytical Chemistry and Spectroscopy
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
A 1H NMR study of methyl, ethyl, n-propyl, isopropyl and allyl alcohols adsorbed on charcoals with various pore structures showed that the adsorption mechanism is by capillary condensation in pores with radii smaller than 30 Å, and by mono-/multi-layer adsorption on the solid surface of pores with larger radii. This mechanism is identical with that of adsorbed hydrocarbons. The 13C NMR parameters suggest that the adsorbed alcohols are preferentially oriented in the monolayer, with the methyl groups bonded to the solid surface. Longer chain alcohols are bent in capillaries with radii smaller than 10 Å. The broadening of the 13C resonances was partly eliminated in magic angle spinning experiments by using a spinning rate of 1.5-1.8 kHz.
Zusätzliches Material:
5 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/mrc.1260271015
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