Ceramic honeycomb catalytic converter

F - Mech Eng,Light,Heat,Weapons – 01 – N

Patent

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F01N 3/28 (2006.01) B01J 35/04 (2006.01) F02B 1/04 (2006.01)

Patent

CA 2131247

A ceramic honeycomb catalytic converter having a novel canning structure capable of stably retaining a thin-walled ceramic honeycomb catalyst within a metal casing for a long period. A retainer member in the form of a ceramic fiber mat is disposed between an inner peripheral surface of the casing and an outer peripheral surface of the honeycomb catalyst, in a compressed state to generate a surface pressure for retaining the honeycomb catalyst in place. The ceramic fiber mat is composed of heat resistant and non-intumescent ceramic fibers, and has a compression characteristic which is substantially free from a significant increase or decrease in a practical use temperature range of the catalytic converter. The casing may be provided with at least one locking member for locking the ceramic fiber mat in a flow direction of exhaust gas passed through the honeycomb catalyst.

Convertisseur catalytique en céramique nid d'abeille comportant une gaine innovatrice capable de maintenir de façon stable un dispositif de catalyse en céramique nid d'abeille à parois minces dans une enveloppe métallique pour une période prolongée. Un dispositif de retenue consistant en un matelas en fibres céramiques est placé entre la surface périphérique interne de l'enveloppe et la surface périphérique externe du dispositif de catalyse nid d'abeille, dans un état comprimé, pour créer une pression superficielle permettant de maintenir en place le dispositif de catalyse nid d'abeille. Les fibres céramiques constituant l'enveloppe sont thermorésistantes et non intumescentes et, lorsque comprimées, elles ne présentent qu'une faible augmentation ou réduction à une gamme de températures d'utilisation pratique du convertisseur catalytique. L'enveloppe peut être munie d'au moins un élément maintenant le matelas en fibres céramiques dans la direction d'écoulement du gaz d'échappement passant dans le dispositif de catalyse nid d'abeille.

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