Promotional effect of phosphorylation on CeSn_0.8W_0.6O_x/TiAl_0.2Si_0.1O_y for NH₃-SCR of NO from marine diesel exhaust

A series of phosphorylation and blank CeSn_0.8W_0.6O_x/TiAl_0.2Si_0.1O_y catalysts prepared by extrusion molding were tested for NH₃-SCR of NO, and were characterized by techniques of X-ray diffraction (XRD), Brumauer-Emmett-Teller (N₂-BET), environmental scanning electron microscope (ESEM), temperature programmed reduction (H₂-TPR) and temperature programmed desorption (NH₃-TPD). Effects of phosphorylation on catalytic activity and sulfur-resisting performance of the CeSn_0.8W_0.6O_x/TiAl_0.2Si_0.1O_y for NH₃-SCR of NO were mainly studied. Results showed that the phosphorylation improved the catalytic activity and sulfur-resisting performance in an active temperature window of 300–440 °C, and the phosphorylation catalyst with 0.4 wt.% H₃PO₄ exhibited the best catalytic performance and the strongest sulfur-resisting performance. Analysis showed that the phosphorylation increased specific surface area, enhanced the surface acidity and improved redox properties.