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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...
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