Catalytic Performance of CDPF with Different Precious Metal Catalyst Loadings

Abstract:

Catalyzed diesel particulate filter(CDPF) samples with 15,25 and 35 g?ft-3 (1 ft = 0.304 8 m) precious metal catalyst loadings were designed to study the effects of precious metal catalyst loading on catalytic activity, degradation resistance and selectivity of CDPF by means of catalytic activity evaluation experiment. The results show that as precious metal catalyst loading increases, fresh CDPF samples present decreasing activity on CO and NO2, and show increasing first and then decreasing trend for the oxidation activity of C3H8. Compared with the fresh samples,as the precious metal catalyst loading increases, the aging CDPF samples have stronger degradation resistance performance on CO and NO2. The CDPF coated medium precious metal catalyst loading has better activity and degradation resistance performance on C3H8. Fresh CDPF samples present strong selectivity on CO,while aging CDPF samples have worse selectivity at low temperature than that at medium and high temperature.