Gm Global Technolgoy Operations, Inc.

Slater William Hawes

Frederick L Kennard

Morris Berg

Paul C Kikuchi

A catalytic converter substrate comprising: a plurality of cell groups, each cell group comprising a plurality of air-flow cells extending axially through the substrate, each cell group comprising a first set of walls defining a radially outer periphery thereof and a second set of walls suspended by the first set of walls partitioning the individual air-flow cells from each other, wherein the first set of walls has a first effective thermal mass and the second set of walls has a second effective thermal mass, wherein the first effective thermal mass is greater than the second effective thermal mass.

Catalytic converter substrate with a plurality of cell groups having

In a preferred embodiment of the invention, a method of making a solid electrolyte electrochemical-type exhaust gas oxygen sensor. A platinum exhaust electrode is sputtered onto a zirconia body and the body then heated in nitrogen at 700.degree.-900.degree. C. for at least 30 minutes to reduce rich-to-lean switching time response.

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Fenton, MI, United States of America

Slater William Hawes