Kinetic modeling of steady-state NH3-SCR over a monolithic Cu-CHA catalyst

Wataru Eijima, Gen Shibata, Naoki Shibayama, Yoshimitsu Kobashi, Hideyuki Ogawa, Ken ichi Shimizu

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

A steady-state kinetic model for the NH3-SCR and NH3 oxidation by a monolithic Cu-exchanged chabazite (Cu-CHA) catalyst has been developed by a combination of flow reactor experiments and kinetic modeling with an in-house computational code. Arrhenius parameters for NH3-SCR and NH3 oxidation and reaction orders with respect to H2O and O2 are collected using a Cu-CHA catalyst coated onto a honeycomb cordierite substrate. While H2O is shown to affect NH3-SCR and low temperature NH3 oxidation to N2 negatively, it promotes high temperature NH3 oxidation to NO. By a combination of calculations for heat and mass transfer and the parameters of the monolithic catalyst, a kinetic model is proposed. The model is validated with eight new experiments for NH3-SCR and NH3 oxidation. The calculated conversions of NO and NH3 are in good agreement with the experimental values over a wide range of temperatures (150 °C–600 °C), indicating that the model can be used for predicting the catalyst performance of the monolithic Cu-CHA for NH3-SCR.

Original languageEnglish
Pages (from-to)237-242
Number of pages6
JournalCatalysis Today
Volume352
DOIs
Publication statusPublished - Aug 1 2020
Externally publishedYes

Keywords

  • Cu-CHA
  • Kinetic model
  • NH-SCR

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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