Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation

Mek Srilomsak, Madhu Singh, Katsunori Hanamura, Randy Lee Vander Wal

Research output: Contribution to conferencePaper

Abstract

Development of the regeneration process on diesel particulate filters (DPF) requires a better understanding of soot oxidation phenomena, especially its relation to soot nanostructure. Nitrogen dioxide (NO2) is known to play an essential role in passive regeneration by partially oxidizing soot at low temperatures, in the presence of oxygen (O2) in the exhaust. However, change in soot nanostructure due to oxidation by NO2-O2 mixtures has not received much attention. Highresolution transmission electron microscopy (HRTEM) reveals nanostructure of model carbons and changes during oxidation. This work focuses on passive regeneration of the DPF by oxidation of soot at normal exhaust gas temperatures (300-400°C). HRTEM imaging of partially oxidized model carbons (R250, M1300, arc-generated soot, graphitic carbon onion, and flame soot) under NO2-O2 mixtures is done to investigate physical changes in nanostructure to test for correlation with the oxidation behavior. Each model carbon presents a specific type of nanostructure-As identified in varied diesel soots. Fringe analysis of HRTEM images of carbon nanostructure is performed to reveal the difference in the structural metrics of fringe lengths, curvature, spacing and tortuosity of the resultant structures. The variation in oxidation rates of different samples highlights the dependence of the oxidation on the nanostructure. These results are compared with the oxidation and nanostructure of a diesel soot.

Original languageEnglish (US)
StatePublished - Jan 1 2018
Event2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018 - State College, United States
Duration: Mar 4 2018Mar 7 2018

Other

Other2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018
CountryUnited States
CityState College
Period3/4/183/7/18

Fingerprint

Soot
soot
Nanostructures
Transmission electron microscopy
Oxidation
transmission electron microscopy
oxidation
Carbon
regeneration
carbon
fluid filters
Nitrogen Dioxide
nitrogen dioxide
exhaust gases
Exhaust gases
gas temperature
flames
arcs
curvature
spacing

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physical and Theoretical Chemistry
  • Chemical Engineering(all)

Cite this

Srilomsak, M., Singh, M., Hanamura, K., & Vander Wal, R. L. (2018). Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.
Srilomsak, Mek ; Singh, Madhu ; Hanamura, Katsunori ; Vander Wal, Randy Lee. / Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.
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Srilomsak, M, Singh, M, Hanamura, K & Vander Wal, RL 2018, 'Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation' Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States, 3/4/18 - 3/7/18, .

Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation. / Srilomsak, Mek; Singh, Madhu; Hanamura, Katsunori; Vander Wal, Randy Lee.

2018. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.

Research output: Contribution to conferencePaper

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AB - Development of the regeneration process on diesel particulate filters (DPF) requires a better understanding of soot oxidation phenomena, especially its relation to soot nanostructure. Nitrogen dioxide (NO2) is known to play an essential role in passive regeneration by partially oxidizing soot at low temperatures, in the presence of oxygen (O2) in the exhaust. However, change in soot nanostructure due to oxidation by NO2-O2 mixtures has not received much attention. Highresolution transmission electron microscopy (HRTEM) reveals nanostructure of model carbons and changes during oxidation. This work focuses on passive regeneration of the DPF by oxidation of soot at normal exhaust gas temperatures (300-400°C). HRTEM imaging of partially oxidized model carbons (R250, M1300, arc-generated soot, graphitic carbon onion, and flame soot) under NO2-O2 mixtures is done to investigate physical changes in nanostructure to test for correlation with the oxidation behavior. Each model carbon presents a specific type of nanostructure-As identified in varied diesel soots. Fringe analysis of HRTEM images of carbon nanostructure is performed to reveal the difference in the structural metrics of fringe lengths, curvature, spacing and tortuosity of the resultant structures. The variation in oxidation rates of different samples highlights the dependence of the oxidation on the nanostructure. These results are compared with the oxidation and nanostructure of a diesel soot.

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Srilomsak M, Singh M, Hanamura K, Vander Wal RL. Quantification of nanostructure changes by HRTEM and fringe analyses during NO2-O2 oxidation. 2018. Paper presented at 2018 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2018, State College, United States.