Catalytic Oxidation of Hydrogen Sulfide on Fe/WSAC Catalyst Surface Modification via NH3-NTP: Influence of Gas Gap and Dielectric Thickness

Abstract

Surface modification of the Fe/WSAC catalyst with NH3-NTP could enhance its catalytic oxidation ability toward H2S. Influences of discharge gaps and dielectric thicknesses were indicated. The H2S catalytic oxidation performance of Fe/WSAC catalyst was increased first and then decreased with increasing of discharge gap or dielectric thickness. The SEM images showed significant changes in the surface topography after treatment at low discharge gaps or large dielectric thicknesses, after which the surface was clear and smooth. The BET results showed that the surface area increased after the plasma treatment at low discharge gas gaps or large dielectric thicknesses. From the XPS spectra, the nitrogen content increased after the plasma treatment, and the deconvolution of the O 1s lattice oxygen peak revealed the oxygen content to increase at short discharge gas gaps. NH3-plasma treatment is an efficient modification method for the improvement of the catalytic oxidation performance of activated carbon catalysts.