Absorbing layer for a high-frequency heating catalyst

(19)

(11)

EP 0 872 911 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	03.05.2000 Bulletin 2000/18

(43)	Date of publication A2:
	21.10.1998 Bulletin 1998/43

(21)	Application number: 98106509.7

(22)	Date of filing: 08.04.1998

(51)	International Patent Classification (IPC)⁷: H01Q 17/00, H05B 6/80, F01N 3/02, F01N 3/20

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

15.04.1997 JP 9759597
17.04.1997 JP 10053097

(71)	Applicant: Zexel Corporation
	Tokyo 150-8360 (JP)

(72)	Inventor:
	Takatsu, Katsumi Higashimatsuyama-shi, Saitama-ken (JP)

(74)	Representative: Goddar, Heinz J., Dr.
	FORRESTER & BOEHMERT Franz-Joseph-Strasse 38 80801 München 80801 München (DE)

(54)	Absorbing layer for a high-frequency heating catalyst

(57) The high-frequency heating catalyst of the present invention comprises a high-frequency absorbing layer formed on the surface of a substrate made from a material which rarely absorbs a high-frequency wave and made from a high-frequency absorbing material and a catalyst such as Pd, Pd/Rh or Pt/Rh, carried by the high-frequency absorbing layer, for making clean harmful substances contained in exhaust gas. Since the high-frequency absorbing layer is made from a mixture of an electroconductive metal oxide and an insulating material having an impedance adjusted to the characteristic impedance of a medium through which a high-frequency wave is transmitted such that reflection power ratio becomes 10 dB or more, the high-frequency wave can be absorbed and converted into heat energy effectively.

Search report