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1 H and 13 C NMR study of the adsorption of alcohols on charcoals with various pore structures
Author(s) -
Du YouRu,
Yuan HanZhen,
Wu DongHui,
Kong YuHua
Publication year - 1989
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260271015
Subject(s) - chemistry , adsorption , monolayer , magic angle spinning , magic angle , isopropyl , nmr spectra database , carbon 13 nmr , analytical chemistry (journal) , nuclear magnetic resonance spectroscopy , organic chemistry , spectral line , biochemistry , physics , astronomy
Abstract A 1 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 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 13 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 Å. The broadening of the 13 C resonances was partly eliminated in magic angle spinning experiments by using a spinning rate of 1.5–1.8 kHz.