4 years ago

Silicate Fiberglasses Modified with Quaternary Ammonium Base for Natural Gas Desulfurization

Silicate Fiberglasses Modified with Quaternary Ammonium Base for Natural Gas Desulfurization
Mark G. Riley, Evgenii V. Kovalyov, Aleksey N. Salanov, Irina S. Batueva, Dzhalil F. Khabibulin, Alexei P. Suknev, Eugenii A. Paukshtis, Bair S. Bal’zhinimaev
A new gel-like film was generated on the surface of silicate fiberglass (FG) under hydrothermal treatment with tetramethylammonium hydroxide (TMAH) water solution. By means of scanning electron microscopy (SEM)/high resolution transmission electron microscopy (HRTEM), 1H NMR magic angle spinning (MAS), and diffuse reflectance infrared fourier transform spectroscopy (DRIFTS), we revealed this film is a phase with density less than pristine FG, where TMA species, as the H2S adsorption sites, are confined. Indeed, FGs modified in this way exhibited a rather high dynamic adsorption capacity which was proportional to concentration of TMA cations bonded with very basic oxygen of Broensted acid residue. The N-modified FG sorbents showed good regenerability when in the presence of water, and the adsorbed hydrogen sulfide on the TMA+O–Si ion pair was easily desorbed at room temperature. This gives grounds to conclude that the process of hydrogen sulfide sorption on N-modified FGs is reversible and proceeds without a loss of adsorption capacity. Indeed, N-modified FGs remained stable during several adsorption–desorption cycles.

Publisher URL: http://dx.doi.org/10.1021/acs.iecr.7b01389

DOI: 10.1021/acs.iecr.7b01389

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