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- W2072955175 abstract "The adsorption of 2-chloropyridine on SiO2, TiO2, ZrO2, SiO2–Al2O3 and H-mordenite has been studied by IR spectroscopy. The different modes of interaction with oxide surfaces, i.e. hydrogen-bonding and adsorption at Brønsted or Lewis acid sites, was modelled by ab initio calculations at the B3LYP/DZ+(d) level. Adsorption on SiO2 results in hydrogen bonding to surface hydroxyl groups, whereas the spectra obtained following adsorption on TiO2 and ZrO2 display evidence for electron transfer at Lewis acidic surface sites. Protonation of 2-chloropyridine at Brønsted acidic sites was detected only for adsorption on SiO2–Al2O3 and H-mordenite, indicating the presence of Brønsted acidic sites on these oxide surfaces with pKa values ≤0.70. IR studies of 2-chloropyridine adsorption can provide useful information regarding the nature of surface acidity on oxides which is complementary to that obtained from other probe molecules such as NHs and pyridine." @default.
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- W2072955175 date "2003-11-01" @default.
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- W2072955175 title "Adsorption of 2-chloropyridine on oxides—an infrared spectroscopic study" @default.
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- W2072955175 doi "https://doi.org/10.1016/s1386-1425(03)00139-2" @default.
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