Abstract
A series of molybdenum (Mo)-modified vanadium (V)-based selective catalytic reduction (SCR) catalyst samples were prepared by incipient impregnation method for the simultaneous removal of elemental mercury (Hg(0)) and nitrogen oxide (NO) under a simulated sub-bituminous coal combustion gas. The Hg(0) oxidation performances of the modified SCR catalysts significantly varied in terms of different formulations and impregnation sequences while NO reduction performance was quite stable. When Mo and tungsten (W) were sequentially doped onto titanium dioxide (TiO2) support followed by V, the modified SCR catalyst showed the best Hg(0) oxidation performance compared to those firstly doped with V onto TiO2 followed by Mo and W or V, Mo and W simultaneously doped onto TiO2. TEM, XPS and XANES results showed that the different impregnation sequences could result in the different particle sizes of MoO3 and the oxidation states of V and Mo speciation, which could lead to different Hg(0) oxidation performances.
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