Multiple strategies to decrease ignition temperature for soot combustion on ultrathin MnO2- x nanosheet array

Qiaolan Shi, Taizheng Liu, Qian Li, Ying Xin, Xingxu Lu, Wenxiang Tang, Zhaoliang Zhang*, Pu Xian Gao, James A. Anderson

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)312-321
Number of pages10
JournalApplied Catalysis B: Environmental
Volume246
Early online date2 Jan 2019
DOIs
Publication statusPublished - 5 Jun 2019

Fingerprint

Soot
Nanosheets
soot
Ignition
combustion
catalyst
diesel
Catalysts
temperature
Vehicle Emissions
Temperature
etching
Precious metals
Oxidants
oxidant
Etching
Catalyst activity
filter
oxidation
Oxidation

Keywords

  • Ignition temperature
  • LaMnO
  • MnOx
  • Nanosheet
  • Soot combustion
  • HIGH-PERFORMANCE
  • OXIDATION
  • SURFACE-PROPERTIES
  • ACTIVE-SITES
  • MNOX-CEO2 MIXED OXIDES
  • SELECTIVE CATALYTIC-REDUCTION
  • LaMnO3
  • EFFICIENT CATALYST
  • NOX
  • MnO2-x
  • DIESEL EXHAUST
  • MONOLITHIC CATALYSTS

ASJC Scopus subject areas

  • Environmental Science(all)
  • Process Chemistry and Technology
  • Catalysis

Cite this

Multiple strategies to decrease ignition temperature for soot combustion on ultrathin MnO2- x nanosheet array. / Shi, Qiaolan; Liu, Taizheng; Li, Qian; Xin, Ying; Lu, Xingxu; Tang, Wenxiang; Zhang, Zhaoliang; Gao, Pu Xian; Anderson, James A.

In: Applied Catalysis B: Environmental, Vol. 246, 05.06.2019, p. 312-321.

Research output: Contribution to journalArticle

Shi, Qiaolan ; Liu, Taizheng ; Li, Qian ; Xin, Ying ; Lu, Xingxu ; Tang, Wenxiang ; Zhang, Zhaoliang ; Gao, Pu Xian ; Anderson, James A. / Multiple strategies to decrease ignition temperature for soot combustion on ultrathin MnO2- x nanosheet array. In: Applied Catalysis B: Environmental. 2019 ; Vol. 246. pp. 312-321.
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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.",
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AU - Gao, Pu Xian

AU - Anderson, James A.

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