Effects of tin doping level on structure, acidity and catalytic performance of Ti-Ce-Ox catalyst for selective catalytic reduction of NO by ammonia

A series of tin-doped Ti-Ce-O-x complex oxide catalysts were synthesized by sol-gel method and tested for selective catalytic reduction of NOx with NH3 (NH3-SCR). Effects of tin additives on structure, acidity and catalytic performance of Ti-Ce-O-x for NH3-SCR of NO were investigated through characterization of N-2 adsorption-desorption, H-2-TPR, XRD, NH3-TPD and SEM. Results showed that tin additives extended the active temperature window especially toward lower temperatures and the NO conversion efficiency of Ti-Sn-Ce-O-x (the Ti/Sn is equal to 4) catalyst reached 92% at 200 degrees C. The addition of tin not only inhibit grain growth of CeO2 and TiO2, but also expand unit cell and cause lattice distortion, which are especially beneficial to NH3-SCR. Moreover the introduction of tin also improved redox property significantly and enhance the acidity of catalyst. The anti-sulfur and anti-influence of water performance of catalyst also improved by tin-doped, when injecting 300 ppm SO2 and 10 vol.% H2O, the NO conversion efficiency of Ti-Sn-Ce-O-x catalyst was still reached 85% at 200 degrees C. (C) 2016 Elsevier B.V. All rights reserved.