Catalysts for NOx selective catalytic reduction by hydrocarbons (HC-SCR)

•Efficient catalysts for HC-SCR discovered since more than 20 years of work.•Combination of different metals and/or catalysts for better HC-SCR materials.•Wide range of activity obtained by silver or a mixture of metals.•Noble metals or Sn are efficient against deactivation. This short review concer...

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Bibliographic Details
Published in:Applied catalysis. A, General General, 2015-09, Vol.504, p.542-548
Main Authors: Mrad, Raya, Aissat, Aissa, Cousin, Renaud, Courcot, Dominique, Siffert, Stéphane
Format: Article
Language:English
Subjects:
HC-SCR
Minireview
NOx
Reduction by hydrocarbons
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Summary:•Efficient catalysts for HC-SCR discovered since more than 20 years of work.•Combination of different metals and/or catalysts for better HC-SCR materials.•Wide range of activity obtained by silver or a mixture of metals.•Noble metals or Sn are efficient against deactivation. This short review concerns the efficient catalysts for HC-SCR discovered more than 20 years ago. In 1990, Iwamoto proposed Cu ion-exchanged ZSM-5, and it was the first powerful catalyst for HC-SCR. This paper presents first metal ion-exchanged zeolites and the influence of various parameters on the catalysts activities (acidity, O2 content, etc.). In the second part, this paper reviews supported metal catalysts, base metal oxides, hybrid catalysts and the possible reducing agents to remove NOx. It can be inferred that the most active catalysts for HC-SCR should have acidic sites, an active phase like copper or cobalt, or for a wider activity, elements such as silver or a mixture of metals. For low deactivation, they should contain noble metals such as platinum, rhodium or tin.
ISSN:0926-860X
1873-3875
DOI:10.1016/j.apcata.2014.10.021