Monolithic Diesel Particulate Filters (DPF) substrate coated with CeO2-MnOx nanorods catalysts for soot oxidation
2022-01-0662
03/29/2022
- Event
- Content
- Abstract Noble metal based Diesel Particulate Filters (DPF) are efficient aftertreatment devices to reduce the PM emissions of diesel engine at present. Because of the high-cost of noble metal, it is necessary to develop base metal soot combustion catalyst. In this work, CeO2-MnOx nanoparticles and nanorods catalysts were prepared by coprecipitation method using different precipitant. The crystal morphology of CeO2-MnOx nanomaterials is identified by a scanning electron microscope. The nitrogen physisorption and hydrogen temperature-programmed reduction results suggest that CeO2-MnOx nanorods has smaller specific surface area and greater redox capacity than CeO2-MnOx nanoparticles. The temperature programmed oxidation (TPO) tests were performed to evaluate the catalytic activity of the catalysts for soot oxidation. Results show that the CeO2-MnOx nanorods catalyst exhibits higher soot oxidation activity than CeO2-MnOx nanoparticles. Afterwards, the prepared CeO2-MnOx materials were loaded on wall-flow Diesel Particulate Filters (DPF) substrates using a proprietary preparation method. The determination of Break-even Temperature (BET) which is representative of the DPF regeneration equilibrium temperature was carried out on a diesel-powered engine for the CeO2-MnOx or Pt based catalysts. The results have shown that the BET of CeO2-MnOx nanorods based DPF and Pt based DPF is ∼ 264 ºC and 267 ºC respectively, which is substantially lower than ∼ 309 ºC of the CeO2-MnOx nanoparticles based DPF. Overall the low-cost CeO2-MnOx nanorods catalyst we prepared is comparable to Pt based catalysts on soot oxidation.
- Citation
- Hao, S., Hu, Y., Yue, J., Lv, Y. et al., "Monolithic Diesel Particulate Filters (DPF) substrate coated with CeO2-MnOx nanorods catalysts for soot oxidation," SAE Technical Paper 2022-01-0662, 2022, .