Development of a detailed surface mechanism for the selective catalytic reduction of NOx with ethanol on silver alumina catalyst

Yuk Fai Tham, J. Y. Chen, Robert Dibble

Research output: Contribution to journalConference articlepeer-review

20 Scopus citations

Abstract

Ethanol selective catalytic reduction (SCR) Of NOx on silver alumina catalyst is a promising technology in reducing NOx from Diesel engines. In particular, experimental results show that using ethanol reductant on low loading silver alumina catalyst can result in greater than 90% of NOx reduction over a wide temperature range. Even though this technology has been demonstrated experimentally, there is no known detailed surface model to describe the ethanol SCR process. In this work, a detailed surface mechanism with 35 irreversible reactions has been developed by critically reviewing literature data on ethanol SCR and by performing Surface Perfectly Stirred Reactor (SPSR) simulations. Using the new surface SCR mechanism along with validated ethanol gas phase chemistry from LLNL, the cause of the inactivity of ethanol SCR at temperatures above 500 °C is found to be the desorption of NO and ethanol rather than gas phase ethanol oxidation. Predictions with the new ethanol SCR mechanism agree well with the experimental NOx conversion. However, further improvement on the model is needed to improve predictions involving the hydrocarbon species.

Original languageEnglish (US)
Pages (from-to)2827-2833
Number of pages7
JournalProceedings of the Combustion Institute
Volume32 II
DOIs
StatePublished - Jul 2 2009
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

Keywords

  • Diesel engines
  • Ethanol
  • NO emission
  • Selective catalytic reduction

ASJC Scopus subject areas

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

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