A comparative study of LHHW and ER kinetic models for NO oxidation over Co3O4 catalyst

Rabya Aslam, Muhammad R. Usman, Muhammad F. Irfan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Experimental data for the NO oxidation to NO2 at atmospheric pressure over Co3O4 catalyst were subjected to various kinetic rate models. The power law kinetics, Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetics, and Eley-Rideal (ER) kinetics were employed to suggest a possible reaction mechanism and a suitable kinetic rate equation. The kinetic rate equation based on the LHHW kinetics with adsorption of NO as the rate-controlling step and the kinetic rate equation based on the ER kinetics with surface reaction as the rate-limiting step were first equivalently found as the best-fit kinetic rate equations. In each case similar activation energies were resulted and that the oxygen adsorption was found inhibiting the rate of the oxidation reaction. However, the final discrimination based on the literature findings suggested the ER model as the best-fit kinetic model with activation energy of 58.3 kJ/mol and enthalpy of dissociative adsorption of oxygen as -2.10 kJ/mol.

Original languageEnglish
Pages (from-to)2871-2877
Number of pages7
JournalJournal of Environmental Chemical Engineering
Issue number3
Publication statusPublished - Sept 1 2016


  • ER model
  • Hybrid fast SCR
  • Kinetic modeling
  • LHHW model
  • NO oxidation

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology


Dive into the research topics of 'A comparative study of LHHW and ER kinetic models for NO oxidation over Co3O4 catalyst'. Together they form a unique fingerprint.

Cite this