The Reduction Of SO₂and No In Flue Gas By V₂O₅/AC Catalyst

This paper took columnar activated coke as the carrier, prepared two types of catalyst:V₂O₅/AC catalyst prepared by solution and nano-V₂O₅/AC catalyst, and studied the difference ofNO reduction, then, had a research of simultaneous desulfurization and denitrificationperformance on nano-V₂O₅/AC catalyst.The V₂O₅/AC catalyst prepared with impregnation method by ammonium metavanadatesolution had a NO conversion of34.87%at a loading of3wt%V₂O₅,200℃,5%O2and10000L/（Kg·h） space velocity. The most suitable conditions were a loading of1³wt%, atemperature of200℃, and O2concentration of5%. The NO reduction of V₂O₅/AC catalystincreased with the decrease of space velocity. NO reduction reached61.89%when the spacevelocity was2500L/（Kg·h）.And the presence of water vapor restrained NO reduction.The nano-V₂O₅/AC catalyst prepared by hydrothermal synthesis method had a better NOreduction. The nano-V₂O₅in the surface of activated coke showed nanobelts, which was at alength of several micrometers, a width of100³00nm and a thickness around100nm. The NOreduction reached45.36%at a loading of1wt%,200℃and2500L/（Kg·h） space velocity.However the NO reduction reached49.72%by adding1wt%Fe₂O₃. The catalyst prepared bythis method had a stable catalytic performance.O2and H2O had important influence on desulfurization over the catalyst, and the adding ofNO and NH3promoted the SO₂reduction. Using the two-step method for desulfurization anddenitration, when the first step reactor temperature was120℃, the second step reactortemperature was200℃, the SO₂removal rate reached94.98%, and the NO removal rate was48.76%after10minters.