Nox catalyst and method of using the same

Details Nox catalyst and method of using the same Nox catalyst and method of using the same

B - Operations, Transporting

01

J

B01J 23/56 (2006.01) B01D 53/94 (2006.01) B01J 20/04 (2006.01) B01J 23/58 (2006.01) B01J 23/63 (2006.01)

Patent

CA 2226412

A NOx abatement composition comprises a NOx abatement catalyst and a NOx sorbent material which are dispersed in proximity to, but segregated from, each other on a common refractory carrier member (10). The NOx sorbent material comprises a basic oxygenated metal compound and optionally further comprises ceria. The NOx abatement catalyst contains a catalytic metal component including a platinum metal catalytic component. The catalytic metal component is segregated from the NOx sorbent material, which may be one or more of metal oxides, metal carbonates, metal hydroxides and mixed metal oxides. At least the catalytic metal component and the NOx sorbent material must be on, or comprise separate, particles; the particles may either be admixed or may be disposed in separate layers (20a, 20b) on the carrier member (10). A NOx abatement method employs the composition and includes periodically adjusting the gas being treated between lean and stoichiometric/rich operating cycles.

Une composition de limitation des émissions de NO¿x? comprend un catalyseur de limitation des émissions de NO¿x? et un solvant de NO¿x? disposés de façon proche mais séparés l'un de l'autre sur un support réfractaire commun (10). Le solvant de NO¿x? comprend un composé métallique oxygéné basique et, à titre facultatif, des oxydes cériques. Le catalyseur de limitation des émissions NO¿x? contient un composant métallique catalytique, à base de platine, qui est séparé du sorbant de NO¿x?, lequel peut être constitué d'un ou plusieurs oxydes, carbonates ou hydroxydes métalliques ou d'oxydes métalliques mixtes. Le composant métallique catalytique et le sorbant de NO¿x? au moins doivent recouvrir ou constituer des particules séparées qui peuvent être soit mélangées soit disposées en couches distinctes (20a, 20b) sur le support (10). Un procédé de limitation des émissions de NO¿x?, qui recourt à cette composition, consiste à régler périodiquement le flux gazeux d'admission pour que sa composition passe entre des cycles de fonctionnement pauvre et stoechiométrique/riche.

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