Claims
- 1. An exhaust gas converter device comprising
- a first shell and a second shell separated from the first shell, connected in series along a gas stream;
- a poisoning-preventive material provided in the first shell having an exhaust gas inlet, said poisoning-preventive material being a ceramic material comprising a compound containing at least one element selected from the group consisting of the Group IIa elements of the periodic table or comprising said compound and another ceramic compound; and
- a catalyst provided in the second shell having an exhaust gas outlet, said catalyst comprising a catalyst support and a noble metal catalytic component deposited on the catalyst support wherein the poisoning-preventive layer is formed on the support in an amount of from 5 to 200 grams per liter of the support.
- 2. An exhaust gas converter device comprising
- two separate shells connected in series along a gas stream;
- a poisoning-preventive material provided in a first shell having an exhaust gas inlet, said poisoning-preventive material being a poisoning-preventive layer-possessing support comprising a support and, formed thereon, a poisoning-preventive layer having a compound containing at least one element selected from the group consisting of the Group IIa elements of the periodic table; and
- a catalyst provided in a second shell having an exhaust gas outlet, said catalyst comprising a catalyst support and a noble metal catalytic component deposited on the catalyst support
- wherein the poisoning-preventive layer is formed on the support in an amount of from 5 to 200 grams per liter of the support.
- 3. An exhaust gas converter device as in claim 2, wherein the poisoning-preventive layer is formed on the support in an amount of from 30 to 150 grams per liter of the support.
- 4. An exhaust gas converter device as in claim 2, wherein the content of the Group IIa element in the compound is 5 wt % or higher.
- 5. An exhaust gas converter device as in claim 2, wherein the content of the Group IIa element in the compound is 20 wt % or higher.
- 6. An exhaust gas converter device as in claim 2, wherein the poisoning-preventive layer extends from an edge of the converter at the exhaust gas inlet to a length over 1/10 th or more of an entire length of the exhaust gas converter device.
- 7. An exhaust gas converter device as in claim 2, wherein the poisoning-preventive layer extends from an edge of the converter at the exhaust gas inlet to a length over 1/5 th or more of an entire length of the exhaust gas converter device.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-5672 |
Jan 1990 |
JPX |
|
2-208373 |
Aug 1990 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/640,349 filed Jan. 11, 1991, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0013243 |
Jul 1980 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
640349 |
Jan 1991 |
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