The relation between surface state and reactivity in the DeNO{sub x} mechanism on platinum-based catalysts

Journal Article · Sun Aug 15 00:00:00 EDT 1999 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1999.2543· OSTI ID:687727

Pitchon, V; Fritz, A ^[1]

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1. CNRS-ECPM, Strasbourg (France). Lab. d`Etudes de la Reactivite Catalytique

The selective reduction of nitrogen oxides by hydrocarbon on Pt supported on La{sub 2}O{sub 3}, ZrO{sub 2}, and a mixture of both has been studied. The supports were prepared by a sol-gel technique. Following a standard pretreatment with oxygen and water, it was found that the platinum was existing in a mixture of both oxidized and reduced forms, yet during the course of the reduction reaction, all of the metal became oxidized. A systematic study of the parameters influencing the reaction demonstrated NO{sub 2} is not a reaction intermediate. The metal remains fully oxidized during the course of the reaction and the hydrocarbon is unable to reduce it; therefore the SCR proceeds without NO dissociation.

• OSTI ID: 687727
• Journal Information: Journal of Catalysis, Vol. 186, Issue 1; Other Information: PBD: 15 Aug 1999
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
01 COAL, LIGNITE, AND PEAT
02 PETROLEUM
NITROGEN OXIDES
SELECTIVE CATALYTIC REDUCTION
PLATINUM
CATALYTIC EFFECTS
LANTHANUM OXIDES
ZIRCONIUM OXIDES
AIR POLLUTION CONTROL