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

16 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

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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

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