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IR Spectroscopy of N-Methylpyrrole Adsorbed on Oxides—A Probe of Surface Acidity

✍ Scribed by Trevor J. Dines; Louise D. MacGregor; Colin H. Rochester

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
127 KB
Volume
245
Category
Article
ISSN
0021-9797

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✦ Synopsis

IR spectra of N-methylpyrrole (NMP) have been measured following adsorption on, and subsequent desorption from, SiO(2), TiO(2), ZrO(2), SiO(2)-Al(2)O(3), H-mordenite, and sepiolite. Three modes of adsorption have been observed: (i) hydrogen bonding to surface hydroxyl groups, (ii) electron transfer at Lewis acidic surface sites, and (iii) proton transfer at Brønsted acidic surface sites. Protonation of NMP was detected only for adsorption on SiO(2)-Al(2)O(3) and H-mordenite, indicating the presence of Brønsted acidic sites with pK(a) values

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