Adsorption of Hydrocarbons from Solutions and Gas Phase on Silica and Alumina Modified with Silver and Gold Ions

Khokhlova, T.D.; Vlasenko, E.V.; Zubareva, N.A.; Van_Nguen; Lanin, S.N.

Авторы: Khokhlova T.D., Vlasenko E.V., Zubareva N.A., Van_Nguen, Lanin S.N.
Журнал: Moscow University Chemistry Bulletin
Том: 67
Номер: 3
Год издания: 2012
Издательство: Allerton Press Inc.
Местоположение издательства: United States
Первая страница: 103
Последняя страница: 108
DOI: 10.3103/S0027131412030066
Аннотация: Abstract—The paper reports the immobilization of Ag+ cations on alumina and silica and Au anions on amino silica and alumina. The method of inverse gas chromatography have demonstrated that Ag(I)silica is selective for the separation of alkanes, alkenes, alkines, and arenes. The dependence of the capacitance of Ag(I) and Au(III) composites with regard to phenylacetylene (PHA) on the nature of the carriers, surface concentration, and technique of immobilizing ion metals has been considered. The isotherms of the adsorp tion of PHA from solutions in octane have been measured. It has been revealed that the capacitance of com posites with regard to toward PHA prepared by the immobilization of ammoniates of silver nitrate on silicon dioxide is several times higher than for composites based on alumina with the same silver concentration and composites prepared by the immobilization of silver nitrate on silicon dioxide. The capacitance of the Au(III) composite based on alumina for PHA is significantly higher than for that based on aluminum oxide. The highest capacitance for PHA (0.83 and 0.88 molecules per metal ion) is observed for Ag(I) silica and the Au(III) alumina composite. In the visible region, the diffuse reflection spectra of amino silica Au(III) com posites have a significant shift of the maximum of adsorption band along with the decrease in the concentra tion of immobilized anions of Au , which evinces the formation of coordination bonds between free aminîpropyl groups of the silica carrier and gold atom. The formation of these bonds prevents the adsorption of PHA on amino silica Au(III) composites with low gold concentrations. Key words: hydrocarbon adsorption, gas chromatography, diffuse reflection spectroscopy, alumina, silica, immobilization of Ag(I), Au(III) DOI: 10.3103/S0027131412030066
Добавил в систему: Ланин Сергей Николаевич

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Adsorption of Hydrocarbons from Solutions and Gas Phase on Silica and Alumina Modified with Silver and Gold Ionsстатья

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