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Catalytic performance and kinetics study of titania-supported catalysts in NH3-SCR process

Denghui Wang, Shien Hui, Shuai Wang, Sheng Liu

NH3-based selective catalytic reduction (SCR) technology has been widely applied to reduce the pollution resulted fromNOx. In this study, the catalytic activity of two different titania-supported catalysts was tested in a self-designed labscale experimental system.Moreover, the differences between them were compared for further analysis with the help of advanced characterization techniques such as X-ray fluorescence (XRF), inductively coupled plasma-optical emission spectroscopy (ICPOES), N2 adsorption-desorption with BET method, andX-ray diffraction (XRD). The catalytic efficiency of the two catalysts increased as either the residence physiotime or the reaction temperature rose,while catalyst B performed better than catalystAat similar conditions. Finally, the activation energy and frequency factor of the reaction over each catalyst were investigated and calculated in this study, and our results indicated that the reaction activation energy of catalystAwas higher than that of catalyst B, but the frequency factor was lower.