B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/34 (2006.01) B01D 53/94 (2006.01)
Patent
CA 2371276
The invention concerns a composition usable as NOx trap in the treatment of exhaust gases. Said composition comprises a support and an active phase, and is characterised in that the active phase is based on manganese and at least another element A selected among alkaline-earths and rare earths, and it has or is capable of having a specific surface area of at least 10m?2¿/g after being calcined for 8 hours at 800 ·C. The support can be based on alumina or alumina stabilised with silicon, zirconium, barium or a rare earth; or based on silica or silica and titanium oxide.
L'invention concerne une composition utilisable comme piège à NOx dans le traitement des gaz d'échappement. Cette composition comprend un support et une phase active, et elle est caractérisée en ce que la phase active est à base de manganèse et d'au moins un autre élément A choisi parmi les alcalino-terreux et les terres rares, et en ce qu'elle présente ou est susceptible de présenter une surface spécifique d'au moins 10m2/g après calcination 8 heures à 800 ~C. Le support peut être à base d'alumine ou d'alumine stabilisée par du silicium, du zirconium, du baryum ou une terre rare; ou encore à base de silice ou de silice et d'oxyde de titane.
Birchem Thierry
Hedouin Catherine
Seguelong Thierry
Rhodia Chimie
Robic
LandOfFree
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