NO2 Oxidation Reactivity and Burning Mode of Diesel Particulates

Andrea Strzelec, Randy Lee Vander Wal, Thomas N. Thompson, Todd J. Toops, C. Stuart Daw

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The NO2 oxidation kinetics and burning mode for diesel particulate from light-duty and medium-duty engines fueled with either ultra low sulfur diesel or soy methyl ester biodiesel blends have been investigated and are shown to be significantly different from oxidation by O2. Oxidation kinetics were measured using a flow-through packed bed microreactor for temperature programmed reactions and isothermal differential pulsed oxidation reactions. The burning mode was evaluated using the same reactor system for flowing BET specific surface area measurements and HR-TEM with fringe analysis to evaluate the nanostructure of the nascent and partially oxidized particulates. The low activation energy measured, specific surface area progression with extent of oxidation, HR-TEM images and difference plots of fringe length and tortuosity paint a consistent picture of higher reactivity for NO2, which reacts indiscriminately immediately upon contact with the surface, leading to the Zone I or shrinking core type oxidation. In comparison, O2 oxidation is shown to have relatively lower reactivity, preferentially attacking highly curved lamella, which are more reactive due to bond strain, and short lamella, which have a higher proportion of more reactive edge sites. This preferential oxidation leads to Zone II type oxidation, where solid phase diffusion of oxygen via pores contributes significantly to slowing the overall oxidation rate, by comparison.

Original languageEnglish (US)
Pages (from-to)686-694
Number of pages9
JournalTopics in Catalysis
Volume59
Issue number8-9
DOIs
StatePublished - May 1 2016

Fingerprint

Oxidation
Specific surface area
Transmission electron microscopy
Kinetics
Biofuels
Packed beds
Biodiesel
Sulfur
Paint
Nanostructures
Esters
Activation energy
Oxygen
Engines

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Cite this

Strzelec, Andrea ; Vander Wal, Randy Lee ; Thompson, Thomas N. ; Toops, Todd J. ; Daw, C. Stuart. / NO2 Oxidation Reactivity and Burning Mode of Diesel Particulates. In: Topics in Catalysis. 2016 ; Vol. 59, No. 8-9. pp. 686-694.
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NO2 Oxidation Reactivity and Burning Mode of Diesel Particulates. / Strzelec, Andrea; Vander Wal, Randy Lee; Thompson, Thomas N.; Toops, Todd J.; Daw, C. Stuart.

In: Topics in Catalysis, Vol. 59, No. 8-9, 01.05.2016, p. 686-694.

Research output: Contribution to journalArticle

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