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1H and 13C NMR study of the adsorption of alcohols on charcoals with various pore structures

✍ Scribed by You-Ru Du; Han-Zhen Yuan; Dong-Hui Wu; Yu-Hua Kong

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
362 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

A 'H 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 Mdi, 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 "C 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 di. The broadening of the "C resonances was partly eliminated in magic angle spinning experiments by using a spinning rate of 1.5-1.8 kHz.

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