Ground-Level Ozone Decomposition over Pd-MnO_x/Al_2O_3 Catalyst Prepared by Urea Hydrolysis

The Pd-MnOx/Al2O3 catalyst has been prepared by the urea hydrolysis method and characterized by low temperature nitrogen adsorption-desorption and X-ray diffraction.Its catalytic activity for decomposing ground-level ozone has been studied.The catalyst showed a high activity at low temperature and high relative humidity.At gas hourly space velocity (GHSV) of 660000 h?1 and relative humidity of 85%-90%,the ozone conversion over the catalyst reached 91.7% at 20 °C and the temperature for complete decomposition of ozone was only 24 °C.Furthermore,the prepared catalyst can completely decompose ground-level ozone when it is coated on the wave shaped heat patches of automobile water tanks.