Oxidation of Elemental Mercury using CVC-generated TiO2 and UV light: Experimental results

Oxidation of Elemental Mercury using CVC-generated TiO2 and UV light: Experimental results
Mercury oxidation; TiO2 photo-catalyst; Ultraviolet light; residence time
Issue Date
The 9th Yokohama Trace Element Workshop
The oxidation of gas-phase elemental mercury was examined using UV light and in situ generated TiO2 catalyst particles for various flue gas residence times (the photochemical reaction time) on the irradiation of UV light. Agglomerated TiO2 catalyst particles, with a high specific surface area, were generated in situ by injecting a gas-phase precursor (TTIP) into a high temperature furnace reactor. In the presence of Ultraviolet A (UVA, 315-400 nm) light irradiation, constituting about 95% of ultraviolet irradiation in natural sunlight, titania particles effectively oxidized elemental mercury, but this requires a relatively long residence time. As the residence time was decreased to 5.0 s, the capturing efficiency of elemental mercury diminished to lower than 85%, which also was strongly dependent on SO2 gas concentration. Ultraviolet C (UVC, 254 nm and 185 nm) generates both ozone and hydroxyl (OH) radical gases in the photochemical reactor which can oxidize elemental mercury. TiO2 photo-catalyst particles accelerated the oxidation of both elemental mercury and SO2 species. Therefore, even though the residence time is shorter than 1.0 s, it has no effect on the capture efficiency. However, SO2 and NO gases still interrupt the oxidative reaction of elemental mercury.
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