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Multiple strategies to decrease ignition temperature for soot combustion on ultrathin MnO2- nanosheet array
- Source :
- Applied Catalysis B: Environmental. 246:312-321
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Diesel soot combustion suffers from ignition temperatures (T10) as high as > 450 °C in the absence of catalysts, which are unavailable in diesel exhaust during normal driving cycles (normally 200–400 °C). A catalytic diesel particulate filter (CDPF) could decrease T10 greatly, but it is often inadequate due to the poor contact associated with the solid (catalyst)-solid (soot) interactions. Herein, a highly significant T10, as low as ˜200 °C, was achieved on noble metal-free ultrathin MnO2-x nanosheet array fabricated by in situ etching of a La layer from LaMnO3 under loose contact conditions in a NO-containing atmosphere. A number of advantages were found with such a system including the improved reducibility. Then, the nanosheet array ensures high dispersion of soot on the catalyst. Finally, high NO-to-NO2 oxidation activity further facilitates contact between catalyst and soot via NO2, a stronger oxidant than O2.
- Subjects :
- Diesel particulate filter
Materials science
Diesel exhaust
Process Chemistry and Technology
Selective catalytic reduction
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Combustion
medicine.disease_cause
01 natural sciences
Catalysis
Soot
0104 chemical sciences
law.invention
Ignition system
Chemical engineering
law
medicine
0210 nano-technology
NOx
General Environmental Science
Nanosheet
Subjects
Details
- ISSN :
- 09263373
- Volume :
- 246
- Database :
- OpenAIRE
- Journal :
- Applied Catalysis B: Environmental
- Accession number :
- edsair.doi...........b23da16ca2f732d17114d226754d2db9