Abstract:Diesel engines have been more and more widely used in heavy duty vehicles because of high efficiency and low fuel consumption compared with petrol engines. Taking ZrO2 as the modified additive, the influence of the mass ratio of ZrO2 and Al2O3 on catalytic performance was studied. The results show that, with an increase of ZrO2 doping, the Pt particles becomes smaller at first and then larger in the catalyst. The interaction between Pt and the carrier increases and then decreases. Analysis of the activity data shows the optimized doping amount of ZrO2 is 40 wt%, the CO/C3H6 complete oxidation temperatures reduced by 20 oC and 25 oC, respectively. The study shows that, when the ZrO2/Al2O3 mass ratio in the carrier is varied, the precious metal dispersion on the catalyst and the precious metals interaction with the carrier are different with varying levels. The smaller the Pt particle size, the stronger the interaction between precious metal and the carrier, which indicates that the performance of catalyst is higher.