Influence of on-board produced hydrogen and three way catalyst on soot nanostructure in Gasoline Direct Injection engines

Maria Bogarra Macias, Jose Herreros, Athanasios Tsolakis, Andrew York, Paul Millington, Martos Francisco

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
204 Downloads (Pure)

Abstract

Effectively controlling carbon soot emission from Gasoline Direct Injection (GDI) engines to achieve legislative emission limits is a challenge for both the vehicle manufacturers and researchers. Transmission electron microscopy is a powerful tool for obtaining morphological and nanostructural parameters of carbon soot in Particulate Matter (PM) emissions. These parameters play a significant role in PM emissions control as are affecting filtration efficiency and soot oxidation characteristics.

In this paper, a comprehensive analysis of the interlayer spacing, fringe length and fringe tortuosity (curvature) of primary soot particles from GDI engine has been performed. GDI primary particles showed a core-shell structure, similar to diesel soot, with an inner core diameter between 6 and 16nm and the outer graphene layer between 6 and 13 nm. The soot nanostructure is not significantly modified by changing the fuel injection timing or by introducing EGR and hydrogen in the combustion process. These results are opposed to those obtained from soot emitted in diesel engines where soot nanostructure is affected with changes in engine operating conditions. Furthermore, the three way catalytic converter does not influence soot nanostructure or the soot oxidation characteristics.
Original languageEnglish
Pages (from-to)326-336
Number of pages11
JournalCarbon
Volume120
Early online date17 May 2017
DOIs
Publication statusPublished - Aug 2017

Keywords

  • GDI
  • PM
  • TEM
  • EGR
  • REGR
  • TWC
  • nanostructure
  • fringe length
  • tortuosity
  • interlayer spacing

Fingerprint

Dive into the research topics of 'Influence of on-board produced hydrogen and three way catalyst on soot nanostructure in Gasoline Direct Injection engines'. Together they form a unique fingerprint.

Cite this