Conversion of Elemental Mercury with a Novel Membrane Delivery Catalytic Oxidation System (MDCOs)

Abstract

In order to overcome the shortcomings of the traditional catalytic oxidation (TCO) mode for the conversion of the trace level of elemental mercury (Hg0) in flue gas, we put forward a novel and unique assembly that integrated membrane delivery with catalytic oxidation systems (MDCOs), which combined the controlled delivery of oxidants with the catalytic oxidation of Hg0. The results show that the demanded HCl for Hg0 conversion in the MDCOs was less than 5% of that in the TCO mode, and over 90% of Hg0 removal efficiency can be obtained in the MDCOs with less than 0.5 mg m−3 of HCl escaped. Meanwhile, the inhibition of SO2 to Hg0 catalytic conversion in the MDCOs was also less significant than in the TCO. The MDCOs have high retainability for HCl, which is quite favorable to Hg0 conversion and HCl utilization. The reaction mechanism on mercury conversion in the MDCOs is discussed. The MDCOs appear to be a promising method for emission control of elemental mercury