Effects of manganese oxide impregnation and flue gas conditions on simultaneous control of Hg0 and NO from coal-fired utility flue gases using SCR catalysts
Journal
Air and Waste Management Association's Annual Conference and Exhibition
Journal Volume
1
Pages
397
ISBN
9781510815582
Date Issued
2015-01-01
Author(s)
Abstract
This research investigated the effects of manganese oxide (MnOx) impregnation on the physical/chemical properties and simultaneous control of Hg0 and NO using a V2O5-WO3/TiO2-SiO2 selective catalytic reduction (SCR) catalyst. Raw and MnOx-treated SCR samples were bean-shaped nanoparticles with sizes of 10-30 nm. The decrease in surface area when the impregnated MnOx amount was 10 wt% may stem from the particle growth or aggregation for SCR catalyst. Mn4+ was the main valence state of impregnated MnOx. MnOx impregnation enhanced the removal of Hg0, NO, and SO2 with SCR catalyst. The 5 and 10% MnOx-impregnated samples had the greatest multipollutant control potentials for removing Hg0 and NO; however, the increasing SO2 removal that may be due to SO2-SO3 conversion should be concerned. HCl and O2 greatly promoted Hg0 oxidation. SO2 enhanced Hg0 oxidation at ≤200 ppm while NO and NH3 consistently inhibited Hg0 oxidation. Elevating flue gas temperature enhanced Hg0 oxidation. Overall, MnOx-impregnated catalyst shows stable and consistent multipollutant removal effectiveness.
Subjects
DeNOx catalyst | Elemental mercury | Glue gas composition | Manganese oxide | Multipollutant control
Description
108th Air and Waste Management Association Annual Conference and Exhibition - Connecting the Dots: Environmental Quality to Climate, ACE 2015; Raleigh; United States; 22 June 2015 到 25 June 2015
Type
conference paper