Enhancing selective catalytic reduction of NOx with alternative reactants/promoters

Martin Herreros, P. George, M. Umar, A. Tsolakis

Research output: Contribution to journalArticle

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Abstract

The hydrocarbon-selective catalytic reduction (HC-SCR) activity of an Ag/Al2O3 catalyst was investigated. The function on catalytic NOx reduction of different fuel properties using alternative reactants such as gas-to-liquid (GTL) and butanol was studied. This work proves that such improvements are due to the high reactivity, polarity and diffusivity of butanol within the catalyst enhancing NOx conversion. Furthermore, it is suggested that HC components such butanol share some of the reaction mechanisms to hydrogen as a promoter in addition to his role as a reductant leading to improve NOx reduction. Therefore, it is proposed the simultaneous dual role of butanol as a reactant and as promoter. Catalyst performance at low temperature was further improved with the addition of hydrogen (H2). However, this performance was found to degrade as temperature increases, due to H2 reactant selectivity changing, directly being oxidised. Increased NOx conversion was dependent on HC:NOx ratio, showing at low temperature a low HC:NOx ratio is required. As temperature increases, so does the required HC:NOx ratio to compensate for hydrocarbons partial and complete oxidation. These results demonstrate a method of gaining significant NOx reduction through the combination of environmental catalysts and alternative reactants.
Original languageEnglish
Pages (from-to)47-54
JournalChemical Engineering Journal
Volume252
Early online date4 May 2014
DOIs
Publication statusPublished - 15 Sep 2014
Externally publishedYes

Fingerprint

Butanols
Selective catalytic reduction
Butenes
catalyst
Catalysts
Hydrocarbons
Hydrogen
hydrogen
hydrocarbon
Temperature
Reducing Agents
diffusivity
Catalyst activity
Gases
temperature
oxidation
Oxidation
liquid
Liquids
gas

Keywords

  • HC-SCR
  • Alternative fuels
  • Hydrogen
  • NOx conversion

Cite this

Enhancing selective catalytic reduction of NOx with alternative reactants/promoters. / Herreros, Martin; George, P.; Umar, M.; Tsolakis, A.

In: Chemical Engineering Journal, Vol. 252, 15.09.2014, p. 47-54.

Research output: Contribution to journalArticle

Herreros, Martin ; George, P. ; Umar, M. ; Tsolakis, A. / Enhancing selective catalytic reduction of NOx with alternative reactants/promoters. In: Chemical Engineering Journal. 2014 ; Vol. 252. pp. 47-54.
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