NH3-SCR activity, hydrothermal stability and poison resistance of a zirconium phosphate/Ce0.5Zr0.5O2 catalyst in simulated diesel exhaust

A ZP/CZ (zirconium phosphate/Ce0.5Zr0.5O2) catalyst exhibits over 80% NOx conversion from 250 to 450 degrees C under a high GHSV of 300 000 h(-1) in the presence of H2O, CO2 and C3H8. Mixing with soot leads to a decrease in NOx conversion of the catalyst at temperatures higher than 350 degrees C. After hydrothermal aging (760 degrees C for 48 h) and sulfur aging (400 degrees C for 48 h), ZP/CZ still possesses over 80% NOx conversions in 289-450 degrees C and 297-466 degrees C respectively, which are significantly better than those of home made Cu-SAPO-34 and vanadium catalysts at higher temperatures. These results indicate that ZP/CZ is a promising catalyst for NOx abatement for diesel engine exhausts.