B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
B01J 23/34 (2006.01) B01D 53/94 (2006.01)
Patent
CA 2367536
The invention concerns compositions used as NOx trap, based on manganese and an alkaline or an alkaline-earth and their use for treating exhaust gases. Said compositions comprise a carrier and an active phase; and they are characterised in that the active phase is based on manganese and at least another element A selected among alkalines or alkaline-earths, the manganese and element A being chemically bound. Said compositions can be used in a process for treating gases to reduce nitrogen oxide emissions, as NOx traps, said gases being derived from internal combustion engines and in particular diesel engines or lean-burn engines.
L'invention concerne des compositions utilisables comme piège à NOx, à base de manganèse et d'un alcalin ou d'un alcalino-terreux et leur utilisation dans le traitement des gaz d'échappement. Ces compositions comprennent un support et une phase active, et elles sont caractérisées en ce que la phase active est à base de manganèse et d'au moins un autre élément A choisi parmi les alcalins et les alcalino-terreux, le manganèse et l'élément A étant chimiquement liés. Ces compositions peuvent être utilisées dans un procédé de traitement de gaz en vue de la réduction des émissions des oxydes d'azote, comme pièges à NOx, ces gaz pouvant provenir de moteur à combustion interne et notamment de moteur diesel ou de moteurs fonctionnant en mélange pauvre.
Birchem Thierry
Hedouin Catherine
Seguelong Thierry
Rhodia Chimie
Robic
LandOfFree
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