The Effect of Substrate Volume on the Catalytic Behavior of Pd/Rh Three-Way Catalysts

摘要

In this paper,Pd/Rh series catalyst substrate samples were prepared at the same cell density,with different volume.The fresh catalyst was aged.And Catalyst test by light-off factor (LOF).The results tested demonstrated that,for the same cell density of substrate,the increase of substrate volume benefited to obtain lower light-off temperature.It was effective measurement that higher cell density enlarged the operating window of catalyst.When the volume of substrate increased by 40％,catalyst light-off temperature decreased 5-10°C,the range of the air-fuel ratio is enlarged in 0.43.And it is role equivalent to the density of the cell density in additive quantity of 50％ or Pd/Rh in additive quantity of 20％.