Ceramic honeycomb catalyst having excellent thermal shock resistance
AssigneeNGK Insulators, Ltd.
InventorsKazuhiko Kumazawa, Koichi Ikeshima
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Abstract
A ceramic honeycomb catalyst having an excellent thermal shock resistance in which a carrier is coated on a ceramic honeycomb structural body, has a mean thermal expansion coefficient in a range from 40.degree. to 800.degree. C. of smaller than 0.7.times.10.sup.-6 /.degree.C. Therefore, it is possible to obtain a ceramic honeycomb catalyst having excellent thermal shock resistance in which a mechanical strength of a ceramic honeycomb structural body to which a carrier such as .gamma.-alumina is coated is not decreased and the carrier is not peeled off from the ceramic honeycomb structural body.
Claims6
A ceramic honeycomb catalyst having excellent thermal shock resistance, comprising:
- a carrier-coated ceramic honeycomb structural body subjected to a heat treatment at a temperature of 900.degree.-1100.degree. C., wherein a mean thermal expansion coefficient of the combined ceramic honeycomb structural body and carrier is smaller than 0.7.times.10.sup.-6 /.degree.C. in a range from 40.degree. to 800.degree. C.
Dependencies are inferred from the claim text.