载体中ZrO_2/Al_2O_3比对Pt/ZrO_2-Al_2O_3催化剂性能的影响（英文）

Influence of ZrO_2/Al_2O_3 Ratio in Carrier on Performance of Pt/ZrO_2-Al_2O_3 Catalyst

相比汽油车而言,柴油车具有高效、低油耗的优势已得到广泛应用。本实验以ZrO_2作为改性剂,探究了ZrO_2与Al_2O_3的质量比对催化剂的影响。结果表明:随着ZrO_2的加入,Pt粒子先减小后增大;Pt粒子与载体的交互作用先增大后减小。活性实验数据的分析表明,ZrO2的最佳添加质量分数为40%,CO和C_3H_6完全氧化温度分别降低20和25℃。贵金属在催化剂的分散度以及贵金属与载体的相互作用随着ZrO_2与Al_2O_3质量比的变化而变化。Pt粒子越小,其与载体的交互作用越强,这表明催化剂性能越强。

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 additive, the influence of the mass ratio of ZrO2 to Al2O3 on catalytic performance was studied. The results show that, with an increase of ZrO2 doping, the Pt particles become 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 complete oxidation temperatures of CO and C3H6 are reduced by 20 and 25 ℃, respectively. 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, and the performance of catalyst is improved.