Abstract
AbstractThe catalytic activity of sulfated CaO in the selective catalytic reduction (SCR) reaction of NO with NH3 in the presence of O2 was investigated. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Brunauer–Emmett–Teller (BET), SEM, XRD, NH3‐TPD (temperature programmed desorption), and NO‐TPD were used to characterize the catalyst of sulfated CaO and analytical grade CaSO4. The BET results indicated that the surface area decreased as the sulfation extent increased due to pore plug. SEM analysis revealed the surface morphology of the sulfated CaO with different sulfation extent. XRD results suggested that the sulfated CaO was hexagonal CaSO4. NH3‐TPD and NO‐TPD experiments indicated that NH3 was more likely to be absorbed on the sulfated CaO than NO, and as the sulfation extent increased, the acid sites reduced because of the decreasing surface area, but the acid strength of surface acidity increased. Based on the characterization and SCR reaction results, NH3 adsorption on CaO and CaSO4, and then reaction with O2 or NO would be the possible reaction route on sulfated CaO. Copyright © 2010 Curtin University of Technology and John Wiley & Sons, Ltd.
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