Promotional Effects of FeO x on the Commercial SCR Catalyst for the Synergistic Removal of NO and Dioxins from Municipal Solid Waste Incineration Flue Gas

In view of the atmospheric pollutants in flue gas raisedby municipalsolid waste (MSW) incineration, simultaneous abatement of nitric oxideand dioxins is the keystone to alleviate the existing environmentalissues. By using the commercial selective catalytic reduction (SCR)catalyst, nitric oxide and dioxins can be directly removed in separatetemperature windows, while the catalytic performances still remainunsatisfactory. Herein, a collection of commercial V2O5-MoO3/TiO2 (VMT) catalysts modifiedwith transition metal oxides were prepared in this study, and theirsynergistic removal activities for NO and dioxins were systematicallyinvestigated. Catalyst performance tests indicated that the loadingof FeO x demonstrated considerable promotionaleffects. To further elucidate the enhancing mechanism of FeO x doping on the physical and chemical properties ofthe catalyst, a series of characterizations were conducted. The resultsindicated that FeO x increased the specificsurface area and pore volume of the catalyst, which was more conduciveto the dispersion of vanadium species. The modification with FeO x also enriched surface acid centers, as wellas the V5+ species on the catalyst surface, so that theadsorption and destruction efficiencies of both nitric oxide and dioxinswere further increased. Furthermore, the abundant chemisorbed oxygenspecies and the redox capacity of the catalyst were intensified, owingto the newly formed Fe3+-V4+/Fe2+-V5+ catalytic redox cycle.