Infrared spectral shifts and heats of adsorption of vapors on silica gel

Elkington, P. A.; Curthoys, Geoffrey

doi:10.1021/j100856a020

Cited by 29 publications

(65 citation statements)

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“…Hertl and Hair have compared the adsorption heats of 23 compounds that are adsorbed to surface hydroxyl groups with the O-H stretching bands of hydroxyl groups of silica at 3750 cm À1 [24]. The interaction of organic molecules with the hydroxyl groups on silica gel has been investigated by Elkington and Curthoys using IR spectroscopy, and they have observed shifts in the structural hydroxyl stretching vibration band on interacting with different organic compounds [25]. It is seen that the adsorption of acetylacetone to layer silicates takes place through carbonyl oxygen [22].…”

Section: Introductionmentioning

confidence: 99%

Nature of organic fluid–montmorillonite interactions: An FTIR spectroscopic study

Amarasinghe

Katti

2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Nature of organic fluid–montmorillonite interactions: An FTIR spectroscopic study

Amarasinghe

Katti

2009

Journal of Colloid and Interface Science

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“…In view of the capability of the oxygen site of a ketone's carbonyl group to function as a basic site, it is not surprising that hydrogen bonding between acetone and suitable hydrogen-bonding acids is well established. , Hence, the acetone/silica system is a reasonable choice for studying the adsorption of acetone on surfaces containing bound OH groups, with the expectation that the properties of this system will be dominated, at least for a range of compositions, by hydrogen-bonded complexes. Indeed, there are prior published studies, based on a variety of techniques, focusing on the acetone/silica system. − …”

Section: Introductionmentioning

confidence: 99%

Hydrogen Bonding between Acetone and Silica Gel, as Studied by NMR

et al. 1999

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13C NMR spectra and relaxation parameters (T 1 H, T 1 C, T 1 ρ H, T CH) were measured via CP-MAS and DP-MAS techniques as a function of acetone loading level in acetone/SiO2 samples at 25 °C. T 1 H and T 1 ρ H values were also measured via 29Si CP-MAS experiments. Peak positions and relaxation parameters are averaged by rapid exchange between different acetone interaction sites on the surface. The data were analyzed in terms of a surface equilibrium of adsorbed acetone units between hydrogen-bonding and non-hydrogen-bonding sites. Data analysis by this model yielded the surface concentration of hydrogen-bonding (silanol) sites (1.5 nm-2) and the equilibrium constant (K = 3.0 nm2). Variable-temperature experiments (124−297 K) at three loading levels yielded values of ΔH° (−5.8 ± 0.3 kJ mol-1) and ΔS° (−12.5 ± 0.7 J K-1 mol-1). A self-consistent, qualitative interpretation of measured relaxation parameters is made in terms of the relative mobilities of hydrogen-bonded (less mobile) and non-hydrogen-bonded (more mobile) acetone on the SiO2 surface.

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“…The values computed for τ e = 0 54 ms are, of course, very similar to the values estimated above by the direct application of Eq. (5). These values are smaller than the maximum values of linewidths of the methyl and carbonyl peaks (55 and 234 Hz) observed in the variable-temperature CP MAS experiments (Table 1).…”

Section: Figmentioning

confidence: 55%