Method for catalytic reduction of nitrogen oxides

Details Method for catalytic reduction of nitrogen oxides Method for catalytic reduction of nitrogen oxides

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/63 (2006.01) F01N 3/08 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2575112

A process which comprises combusting a fuel while oscillating the combustion atmosphere cyclically and alternately between rich and lean conditions, leading the formed exhaust gas to a catalytic converter, and bringing the exhaust gas into contact with a catalyst in the converter to conduct the catalytic reduction of nitrogen oxides contained in the gas, wherein the catalyst contains as the catalyst components (A) an oxide catalyst component consisting of (a) ceria, (b) praseodymium oxide, or (c) a mixture of oxides of at least two elements selected from among cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium, and lanthanum and/or a double oxide of at least two elements selected from among the same and (B) a noble metal catalyst component consisting of (d) at least one member selected from among platinum, rhodium, palladium, and oxides of them and the oxygen concentration at the exit of the converter under rich condition is adjusted to 0.1 to 1.0 %.

Procédé qui comprend la combustion d~un carburant en même temps que l~oscillation du milieu de combustion de façon cyclique et alternant entre des conditions riches et pauvres, conduisant les gaz d~échappement formés vers un convertisseur catalytique et amenant les gaz d~échappement en contact avec un catalyseur dans le convertisseur pour conduire la réduction catalytique des oxydes d~azote contenus dans les gaz, où le catalyseur contient comme composants (A), un composant de catalyseur d~oxyde constitué de (a) de l~oxyde de cérium, (b) de l~oxyde de praséodyme ou (c) d~un mélange d~oxydes d~au moins deux éléments choisis parmi le cérium, le zirconium, le praséodyme, le néodyme, le terbium, le samarium, le gadolinium, et le lanthane et/ou d~un double oxyde d~au moins deux éléments choisis parmi les mêmes et (B), un composant de catalyseur en métal précieux constitué (d) d~au moins un élément choisi parmi le platine, le rhodium, le palladium et leurs oxydes et la concentration en oxygène à la sortie du convertisseur en conditions riches est réglée entre 0,1 et 1,0 %.

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