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Treatment of V2O5/TiO2 by Non-Thermal Plasma: Changes in Surface Characters and Mercury Oxidation Activity

The technology for mercury removal in coal-fired power plant is still under development. In the flue gas, elemental mercury is the main component of mercury, and is hard to be removed due to its high volatility and low solubility. So converting Hg0 to Hg2+ in or ahead of the FGD is significant to enhance mercury removal. In this work, plasma treatment method was used to prepare V2O5/TiO2 catalysts for effectively oxidation of Hg0. Plasma treatment of V2O5/TiO2 resulted in the improvement of mercury oxidation activity. The Hg0 oxidation efficiency of the catalysts treated by plasma is over 82% at 300 °C, which is about 30% higher than that of the untreated catalyst. The catalysts were characterized using SEM, BET and EPR. SEM results indicated that plasma treatment can create cracks and small particles on simple surface, however, calcinations cause sintering and agglomeration. The superior catalytic performance is mainly attributed to the formation of particles attached to the catalyst surface, the higher amount of V4+ ions and vacancies on the catalyst surface.