Electrically heated carrier and exhaust gas purification device

The electrically heated catalysts with a structured honeycomb design and resistance regions address non-uniform heat generation, enhancing performance and reducing cracks, suitable for exhaust gas purification.

JP7750761B2Active Publication Date: 2025-10-07NGK CORP
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Patent Information

Application Number
JP2022016551
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2021-03-31
Filing Date
2022-02-04
Publication Date
2025-10-07
Estimated Expiration
2042-02-04

AI Technical Summary

Technical Problem

Existing electrically heated catalysts with honeycomb structures face challenges in achieving uniform heat generation, with temperature distribution issues near electrodes and peripheral regions, leading to potential cracks and inefficiencies.

Method used

A conductive honeycomb structure with a specific arrangement of electrode layers and resistance regions, including a high-resistance third region that does not contact the electrode layers, ensuring uniform current distribution and heat generation across the structure.

Benefits of technology

The solution enhances heat generation uniformity, reduces temperature differences, and suppresses crack formation, improving the performance of the electrically heated carrier as a catalyst support.

✦ Generated by Eureka AI based on patent content.

Smart Images

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Patent Text Reader

Abstract

To provide an electric heating carrier with improved heating uniformity.SOLUTION: An electric heating carrier comprises a conductive honeycomb structure and a pair of electrode layers, in which the honeycomb structure is classified into the following three regions in a cross section orthogonal to a direction in which cells extend: a first resistance region having a contact to a first electrode layer; a second resistance region having a contact to a second electrode layer; and a third resistance region not in contact with either the first electrode layer or the second electrode layer and traversing the cross section in a manner to be sandwiched between the first resistance region and the second resistance region, the third resistance region having a higher electrical resistance per unit volume (1 cm3) than electrical resistances per unit volume (1 cm3) in the first resistance region and the second resistance region.SELECTED DRAWING: Figure 3
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Citation Information

Patent Citations

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