Raman spectral investigation of pyridine desorption phenomena at the silica/carbon tetrachloride interface

Adsorption Interactions of Aromatics and Heteroaromatics with Hydrated and Dehydrated Silica Surfaces by Raman and FTIR Spectroscopies

“…In addition to providing molecules of rich vibrational activity for study, it was believed that the results from these studies would complement the already extensive literature (30)(31)(32)(33)(34)(35)(36) on the related adsorbate system of pyridine on silica. Early studies used vapor-phase pyridine adsorption and established that the pyridine totally symmetric ring breathing mode and trigonal symmetric ring stretch are particularly sensitive to the strength of interaction between the pyridine lone pair electrons and the silica surface (30)(31)(32)(33). Physisorption, hydrogen-bonding, and Brønsted acid-base interactions between pyridine and various oxides were distinguished by the frequency shifts of these modes (30)(31)(32)(33).…”

“…Several studies on liquid-phase pyridine adsorption have also appeared (33)(34)(35)(36). In one such study (35), the effect of pH on the sorption of pyridine, acridine, and quinoline on silica from aqueous solutions was reported.…”

Adsorption of organic molecules on silica surface

“…The nature of sorption of nonpolar sorbates at polar solvent/ oxide interface and polar sorbates at nonpolar solvent/oxide interface were studied using Raman spectroscopy [323][324][325]. The investigation of adsorption behaviour of benzene, pyridine and azobenzene on CCl 4 /silica surface provided the evidence of strong hydrogen bonding involving benzene π-bonding electrons and silanols.…”

The pyridine vapor adsorption behavior and its influence on suppressing low-temperature cross-linking reactions during slow pyrolysis of lignite

“…At atmospheric pressure, pyridine adsorption amount can reach 0.0424 g/g even at room temperature. From these results and a previous work [13], using the literature that specialized on the adsorption interactions of pyridine vapor with kinds of materials [20][21][22] and the study on the diffusion of pyridine in the coal [23] as references, the following pyridine adsorption process can be deduced. First, pyridine is absorbed on coal surface and the amount is small because of the limited specific surface and the narrow pore size.…”