1 research outputs found
Silicate Fiberglasses Modified with Quaternary Ammonium Base for Natural Gas Desulfurization
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), <sup>1</sup>H
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 H<sub>2</sub>S 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<sup>+</sup>–<sup>–</sup>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