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 NH 3 -NTP could enhance its catalytic oxidation ability toward H 2 S. Influences of discharge gaps and dielectric thicknesses were indicated. The H 2 S 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. NH 3 -plasma treatment is an efficient modification method for the improvement of the catalytic oxidation performance of activated carbon catalysts.

A Review about the Recent Advances in Selected NonThermal Plasma Assisted Solid–Gas Phase Chemical Processes

“…The same authors [73] investigated the influence of gas gap (3.5, 4.5, 5.5, 6.5, 7.5 mm) at a fixed dielectric thickness of 1.5 mm and dielectric thickness (1, 1.5 and 2 mm) at a fixed gas gap of 5.5 mm during the NH 3 treatment on the performance of the Fe/WSAC for H 2 S removal in the DBD reactor described above. For these catalysts, the treatment was performed at 6.8 kV for 10 min.…”

Fluorescent Patterning of Polymeric Substrates with Rare-Earth-Doped Nanophosphors Assisted by Atmospheric Pressure Plasma

“…DBD plasmas have been applied in many applications, like surface treatment, nanomaterials synthesis, pollutant degradation, plasma catalysis, and gas conversion. , The high concentration of active species produced in the plasma medium can help to accelerate chemical reactions or to promote reactions that are difficult to achieve in a traditional chemical process . At the same time, owing to its atmospheric pressure and nonequilibrium characteristics, DBD plasma printing is especially favorable for handling temperature-sensitive substrates or coatings in a mild environment without destroying them . Pioneered by Klages et al, the technique has been explored to solve surface-technological tasks, including the formation of electrophilic groups on polymers, the area-selective creation of hydrophilic channels and hydrophobic barriers, the functionalization of the PMMA surface for developing plasmonically active polymer optical probes, etc .…”

“…10 At the same time, owing to its atmospheric pressure and nonequilibrium characteristics, DBD plasma printing is especially favorable for handling temperature-sensitive substrates or coatings in a mild environment without destroying them. 11 Pioneered by Klages et al, the technique has been explored to solve surfacetechnological tasks, including the formation of electrophilic groups on polymers, 12 the area-selective creation of hydrophilic channels and hydrophobic barriers, 13 the functionalization of the PMMA surface for developing plasmonically active polymer optical probes, etc. 14 Other researchers also actively utilized DBD plasma to endow polymers with antimicrobial activity 15 to improve the corrosion-resistance performance of metals 16 and tune the wettability of fibers.…”