A gas sensor having a compounded catalytic structure

G - Physics – 01 – N

Patent

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G01N 27/16 (2006.01) G01N 33/00 (2006.01)

Patent

CA 2226056

A gas sensor for detecting the presence of gases in air. In particular, sensors are described that have a compound catalytic support structure and are suitable for sensing hydrocarbons and nitrogen oxides. The device features a ceramic substrate having a temperature sensitive resistor on one surface. A mixture of ceramic particles and glass powder are applied over the substrate and resistor and fired so that the glass flows and adheres the ceramic particles to the substrate. A catalyst layer of either platinum or rhodium is deposited on the catalyst support and a thermally sensitive resistor element detects reactions of hydrocarbons or nitrogen oxides on the corresponding catalyst. The invention is suitable for sensing gases in the harsh environment of an automobile exhaust system.

Dispositif servant à détecter la présence de gaz dans l'air. Plus particulièrement, ce dispositif comporte une structure de support catalytique combinée et permet de détecter les hydrocarbures et les oxydes d'azote. Il comprend un substrat de céramique constitué d'un résisteur thermosensible sur une surface. Un mélange de particules de céramique et de poudre de verre est appliqué sur le substrat et le résisteur. Il est chauffé pour que le verre coule et permette l'adhésion des particules de céramique au substrat. Une couche catalytique de platine ou de rhodium est déposée sur le support catalytique, et un élément résisteur thermosensible détecte les réactions des hydrocarbures ou des oxydes d'azote sur le catalyseur correspondant. Cette invention permet de détecter des gaz dans le milieu hostile d'un système d'échappement d'automobile.

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