Claims
- 1. In a method of treating exhaust gases from a diesel engine which emits an exhaust gas containing particles of soot and hydrocarbons, the improvement which comprises contacting the exhaust gas with a catalyst consisting essentially of a zeolite having acid properties, and of the general formula
- 2. The method according to claim 1, wherein the zeolite has cracking properties for long-chain and aromatic hydrocarbons.
- 3. The method according to claim 1, wherein the zeolite is a faujasite.
- 4. The method according to claim 1, wherein the zeolite is a dealuminized faujasite.
- 5. The method according to claim 1, wherein the zeolite is a pentasil.
- 6. The method according to claim 5, wherein the zeolite has SiO2 and Al2O3 at an SiO2 to Al2O3 ratio of 25 to 2000.
- 7. The method according to claim 1, wherein the zeolite is a mordenite.
- 8. The method according to claim 1, wherein the zeolite is a dealuminized mordenite.
- 9. The method according to claim 1, wherein the zeolite contains at least one element selected from the group consisting of elements of the 2nd main group of the periodic system of elements and the rare earth elements.
- 10. The method according to claim 1, wherein the zeolite contains at least one transition element.
- 11. The method according to claim 1, wherein the zeolite contains at least one element selected from the group consisting of Cu, Ni, Co, Fe, Cr, Mn and V.
- 12. The method according to claim 1, wherein the zeolite contains Cu.
- 13. In combination, a diesel engine, a pipe for exhaust gas produced when operating the diesel engine, and a zeolite having acidic properties positioned so that the exhaust gas contacts it in exhausting to the atmosphere.
Priority Claims (1)
Number |
Date |
Country |
Kind |
P 41 05 534.9 |
Feb 1991 |
DE |
|
Parent Case Info
[0001] This application is a continuation-in-part of application Ser. No. 08/192,874, filed Feb. 7, 1994, now pending; which is a continuation-in-part of application Ser. No. 07/836,043, filed on Feb. 12, 1992, now abandoned.
Continuations (3)
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Parent |
09967372 |
Sep 2001 |
US |
Child |
10679083 |
Oct 2003 |
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Parent |
09548825 |
Apr 2000 |
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Child |
09967372 |
Sep 2001 |
US |
Parent |
08611699 |
Mar 1996 |
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Child |
09548825 |
Apr 2000 |
US |
Continuation in Parts (2)
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08192874 |
Feb 1994 |
US |
Child |
08611699 |
Mar 1996 |
US |
Parent |
07836043 |
Feb 1992 |
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Child |
08192874 |
Feb 1994 |
US |