Spatio-temporal dynamics of oxygen storage and release in a three-way catalytic converter

Pankaj Kumar, Tian Gu, Karolos Grigoriadis, Matthew Franchek, Vemuri Balakotaiah

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


A physics based one-dimensional transient seven partial differential equation model is proposed to study the oxygen storage dynamics and cold start behavior of a three-way catalytic converter. The model uses the recently published simplified kinetic model, is computationally efficient and may be used for offline TWC outer loop controller design and validation. The proposed TWC model is validated using emissions data collected in a vehicle over multiple drive cycles including FTP cycles. The internal mass transfer approximation is confirmed by comparing with a detailed washcoat diffusion-reaction model and is observed to be consistent for all practical purposes. The results are also used to study the qualitative and quantitative errors in emission and oxygen storage predictions caused by axially averaging thus identifying the region of applicability of the simpler axially averaged seven ordinary differential equation model.

Original languageEnglish (US)
Pages (from-to)180-190
Number of pages11
JournalChemical Engineering Science
StatePublished - May 24 2014


  • Catalysis
  • Chemical reactor
  • Model reduction
  • Oxygen storage
  • Three-way converter

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Applied Mathematics
  • Industrial and Manufacturing Engineering


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