Honeycomb heater and catalytic converter

B - Operations – Transporting – 01 – D

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Details

B01D 53/94 (2006.01) B01J 23/32 (2006.01) B01J 23/63 (2006.01) F01N 3/20 (2006.01) F28D 7/16 (2006.01)

Patent

CA 2057564

A honeycomb heater has a honeycomb structure having a number of passages defined by partition walls. At least two electrodes are in electrical contact with the honeycomb structure, and a catalyst composition is formed on partition walls of the honeycomb structure. The catalyst composition includes zirconia powder loaded with Rh, an inorganic heat-resistant oxide, and a rare earth element oxide. A catalytic converter has at least one or two main monolithic catalyst(s), and such a honeycomb heater disposed upstream, downstream or between the main monolithic catalysts.

Un système de chauffage possède une structure en nid d'abeilles, avec un certain nombres de passages délimités par des cloisons de séparation. Au moins deux électrodes sont en contact électrique avec la structure en nid d'abeilles, et une composition catalytique est formée sur les cloisons de séparation de la structure en nid d'abeilles. La composition catalytique est à base de poudre de zircone avec une charge de Rh, d'un oxyde minéral thermorésistant et d'un oxyde de terre rare. Un convertisseur catalytique possède au moins un ou deux catalyseurs principaux monolithiques, et un système de chauffage en nid d'abeilles de ce type, disposé en amont ou en aval des principaux catalyseurs monolithiques, ou entre les deux.

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