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Hydrogen Bond Strengths and Acidities of Hydroxyl Groups on Silica-Alumina Surfaces and in Molecules in Solution

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dc.contributor.author Rouxhet, Paul G.
dc.contributor.author Sempels, Raymond E.
dc.date.accessioned 2025-02-18T11:49:29Z
dc.date.available 2025-02-18T11:49:29Z
dc.date.issued 1974
dc.identifier.uri http://dspace.bits-pilani.ac.in:8080/jspui/handle/123456789/17871
dc.description.abstract The properties of hydroxyl groups on mixed silica–alumina gels (0–50 % Al2O3) have been studied by adsorbing weak H bond accepting molecules onto the gels and recording the OH stretching infrared band. Additional measurements on silica gel and compilation of numerous literature data have shown that frequency shift measurements, or series of ΔvOH measurements condensed into BHW (Bellamy, Hallam and Williams) slopes, provide a reliable estimate of the OH acidity. The resulting scale is independent of the atom to which the hydroxyl is attached; it may be used for surfaces of solids as well as for solutions. The results obtained for silica–alumina show that two distinct populations of hydroxyl groups are present. Hydroxyl groups of type 1 are identical with those present on the surface of silica. The spectra show the presence of hydroxyl groups of a second type, the proportion of which increases as the Al content of the gel rises; their acidity corresponds to a pKa between –4 and –8 and they are presumably the sites responsible for the protonation observed upon adsorption of pyridine or ammonia. en_US
dc.language.iso en en_US
dc.publisher Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (11) en_US
dc.subject Chemistry en_US
dc.subject Hydrogen Bond en_US
dc.subject Hydroxyl Groups en_US
dc.subject Silica-Alumina Surfaces en_US
dc.subject Journal of the Chemical Society : Faraday Transaction - I en_US
dc.title Hydrogen Bond Strengths and Acidities of Hydroxyl Groups on Silica-Alumina Surfaces and in Molecules in Solution en_US
dc.type Article en_US


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