Catalytic removal of NOx by CeO۲-MnOx mixed oxide supported on H-ZSM-۵

چکیده مقاله

CeO2-MnOx mixed oxide was supported on H-ZSM-5 by sol-gel combustion method. Samples with different CeO2-MnOx loadings (10–30 wt.%) were prepared and were characterized with respect to their phase composition and mean crystallite size (XRD), nanostructure morphology (TEM), reducibility (H2-TPR), acidity characteristics (NH3-TPD). The catalytic activity of these samples was evaluated for the selective catalytic reduction of NOx with NH3. With the rise of reaction temperature, the NO conversion of Ce-Mn/ZSM-5 increases, whereas the N2 selectivity was close to 100% in temperature range of 100-400 °C. The 20 %wt. CeO2-MnOx /ZSM-5 exhibited 91% NO conversion and 98% N2 selectivity at 300 °C, ascribing to nanocrystalline structure, reducibility at low temperature and synergistic effect between Ce and Mn that are approved by XRD and H2-TPR results.