Catalytic Characteristic and Application Performance of Catalyzed DPFs Coated with Various Concentration of Precious Metal

Paper #:
  • 2017-01-0934

  • 2017-03-28
By the source apportionment from the Chinese cities Shanghai, Beijing, etc., vehicle emission pollutants have become dominating particulate matter source in atmosphere, especially the primary and secondary particulates from the diesel vehicles. Based on the experience of more developed nations, DOC (Diesel oxidation catalyst) and DPF (Diesel particle filter) together installed in the diesel vehicle can significantly reduce particulate emissions. Moreover, in order to further promote the catalytic oxidation capacity and carrier regeneration, the surface of DPF carrier is coated with catalyst, namely, catalyzed DPF, CDPF. However, at present there are lacks of fundamental data of catalytic characteristic of CDPF and comprehensive evaluation method of full-scale CDPF applied on diesel vehicle. In this paper, it was studied on effects of various concentration of precious metal on physicochemical property, catalytic activity and degradation resistance of CDPF by means of characterization techniques (XRD, XPS, H2-TPR, etc.). Moreover, it was based on heavy vehicle chassis dynamometer to evaluate the effects of the three full-scale CDPFs (CDPF-1, -2, -3) coated with incremental concentration of precious metal (15, 25 and 35 g/ft3) on CO, THC, NOX, volatile organic compounds VOCs and particulate components (OC/EC and PAHs) of the diesel city bus during transient driving cycles. The main research results are summarized as follows. (1) As precious metal concentration increase, fresh CDPF samples presented decreasing activity for CO and NO2, and showed increasing first and then decreasing trend for C3H8. Compared with the fresh samples, as the precious metal concentration increase, the aged CDPF samples had stronger degradation resistance performance on CO and NO2. The CDPF with medium concentration had better activity and degradation resistance performance on C3H8. (2) The full-scale CDPF-1 with lower concentration of precious metal presented lower activity for CO, THC and NO2. The removal rate of VOCs of CDPF-1, -2 and -3 were 57.6%, 63.1% and 66.8%, respectively. CDPFs can obviously reduce the OC/EC carbon components, PAHs and toxicity equivalent, but the CDPF with medium concentration of precious metal concentration presented minor reduction advantage. Key Words: catalyzed DPF, catalytic activity, degradation resistance, diesel city bus application, VOCs, PAHs
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