EP0048808A1 - Verfahren zur Verbesserung des Alterungsverhaltens von Katalysatoren zur oxidativen Reinigung der Abgase von Verbrennungskraftmaschinen bei Einsatz von verbleiten Kraftstoffen - Google Patents

Verfahren zur Verbesserung des Alterungsverhaltens von Katalysatoren zur oxidativen Reinigung der Abgase von Verbrennungskraftmaschinen bei Einsatz von verbleiten Kraftstoffen Download PDF

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Publication number
EP0048808A1
EP0048808A1 EP81106184A EP81106184A EP0048808A1 EP 0048808 A1 EP0048808 A1 EP 0048808A1 EP 81106184 A EP81106184 A EP 81106184A EP 81106184 A EP81106184 A EP 81106184A EP 0048808 A1 EP0048808 A1 EP 0048808A1
Authority
EP
European Patent Office
Prior art keywords
lead
exhaust gases
combustion engines
catalyst
purification
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP81106184A
Other languages
German (de)
English (en)
French (fr)
Inventor
Alfred Bozon
Edgar Dr. Koberstein
Hans-Dieter Dr. Pletka
Herbert Völker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Degussa GmbH filed Critical Degussa GmbH
Publication of EP0048808A1 publication Critical patent/EP0048808A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2430/00—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics
    • F01N2430/06—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by varying fuel-air ratio, e.g. by enriching fuel-air mixture

Definitions

  • the invention relates to a method for extending the effective life of catalysts, in particular based on noble metals, for oxidative cleaning.
  • the exhaust gases from internal combustion engines contain, in addition to the components that are harmless to living beings.
  • Nitrogen and water vapor also contain toxic components such as carbon monoxide, nitrogen oxides, unburned or partially oxidized or multinuclear: hydrocarbons and aldehydes.
  • the compounds formed from lead tetraalkylene during the combustion process bring about a rapid deactivation of the catalyst in the conventional operating mode of an internal combustion engine equipped with an oxidation catalyst and secondary air supply.
  • air / fuel ratio 12
  • this method requires complex equipment and quite complicated switching mimics.
  • the very rich engine setting required leads to very high fuel consumption.
  • the invention is based on the object. to open up a way in which when a catalytic converter is exposed to exhaust gases from leaded fuels, the catalytic converter is deactivated too quickly and the disadvantages discussed are avoided.
  • the invention accordingly relates to a process for improving the aging behavior of catalysts for the oxidative cleaning of the exhaust gases from internal combustion engines when using leaded fuels, which is characterized in that the internal combustion engine is operated with an essentially stoichiometric air / fuel ratio.
  • a particular advantage of the method according to the invention is also the saving of the complex device for the secondary air supply of the exhaust system. Is this a mechanical air pump, which by. the engine is driven, the saving of the same means a gain in usable power and thus a reduction in fuel consumption.
  • a complicated device for cyclic regeneration of the catalyst used by alternating rich and lean operation, as well as the second catalyst required for this purpose can be used. takes over the catalytic function in the regeneration phase, can be dispensed with.
  • An increase in the air / fuel ratio of 12 in the direction of stoichiometry, i.e. a leanness also reduces the fuel consumption by a considerable amount. This is also evident from the publication "Exhaust emissions from motor vehicles in large cities and industrial conurbations" by Prof. Dr. Ing. Hans May, 1973, published by TÜV Rheinland GmbH, Cologne.
  • Example 2 As in Example 1, a similar catalyst was placed in the exhaust gas stream of a gasoline engine, but this time a mixture of platinum / rhodium was used as the noble metal component. All other catalyst and operating parameters remained the same. The results are shown in FIG. 1 and the aging curve for this catalyst is designated by (2).
  • Example 3 The same catalyst as in Example 1, but this time on a cordierite amplifier with a honeycomb structure and one. Cell count of 400 cells / inch 2 was exposed to the same conditions as in Example 1. The test results can be seen from Fig. 3, in which the aging curve of the catalyst from this example is denoted by catalyst (3).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Catalysts (AREA)
EP81106184A 1980-09-25 1981-08-07 Verfahren zur Verbesserung des Alterungsverhaltens von Katalysatoren zur oxidativen Reinigung der Abgase von Verbrennungskraftmaschinen bei Einsatz von verbleiten Kraftstoffen Withdrawn EP0048808A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803036130 DE3036130A1 (de) 1980-09-25 1980-09-25 Verfahren zur verbesserung des alterungsverhaltens von katalysatoren zur oxidativen reinigung der abgase von verbrenungskraftmaschinen bei einsatz von verbleiten kraftstoffen
DE3036130 1980-09-25

Publications (1)

Publication Number Publication Date
EP0048808A1 true EP0048808A1 (de) 1982-04-07

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP81106184A Withdrawn EP0048808A1 (de) 1980-09-25 1981-08-07 Verfahren zur Verbesserung des Alterungsverhaltens von Katalysatoren zur oxidativen Reinigung der Abgase von Verbrennungskraftmaschinen bei Einsatz von verbleiten Kraftstoffen

Country Status (7)

Country Link
EP (1) EP0048808A1 (es)
JP (1) JPS5786543A (es)
AU (1) AU7564081A (es)
BR (1) BR8106013A (es)
CA (1) CA1166617A (es)
DE (1) DE3036130A1 (es)
ES (1) ES504050A0 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5073289A (en) * 1989-11-02 1991-12-17 The Curators Of The University Of Missouri Paint stripper composition having reduced volatility containing decanolactone, n-methylpyrrolidone and butyrolactone and method of use
US5661971A (en) * 1994-12-02 1997-09-02 Volkswagen Ag Method for reducing pollutants in the exhaust gas of a multi-cylinder internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599427A (en) * 1969-09-22 1971-08-17 Ford Motor Co Exhaust gas purification
DE2146084A1 (de) * 1971-09-15 1973-03-29 Aerolyt Vertriebsgesellschaft Vorrichtung zum entgiften von abgasen, insbesondere aus verbrennungsmotoren
DE2615377A1 (de) * 1975-04-08 1976-10-14 Nissan Motor Verfahren und einrichtung zur steuerung und ueberwachung des luft/brennstoffverhaeltnisses fuer brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3599427A (en) * 1969-09-22 1971-08-17 Ford Motor Co Exhaust gas purification
DE2146084A1 (de) * 1971-09-15 1973-03-29 Aerolyt Vertriebsgesellschaft Vorrichtung zum entgiften von abgasen, insbesondere aus verbrennungsmotoren
DE2615377A1 (de) * 1975-04-08 1976-10-14 Nissan Motor Verfahren und einrichtung zur steuerung und ueberwachung des luft/brennstoffverhaeltnisses fuer brennkraftmaschinen

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
Automotive Engineering, Band 87, Nr. 8, August 1979, seiten 57-59 New York, U.S.A. "Catalytic Converters: Current Trends" * seite 58, rechte spalte, Absatz 5; figur 5 * *
Motortechnische Zeitschrift, Band 33, Nr. 5, Mai 1972, seiten 20l-213 Stuttgart, DE. Dipl-Ing. K. OBLANDER et al.: "Entwicklungsstand der Thermischen und Katalytischen Nachverbrennung bei Ottomotoren" * seite 213, linke spalte, Absatz 2 * *
Motortechnische Zeitschrift, Band 34, Nr. 1, Januar 1973, seiten 7-11 Stuttgart, DE. DR.-ING. R. ZECHNALL et al.: "Reines Abgas bei Otto-Motoren Durch Geschlossenen Regelkreis" * seite 8, rechte spalte, absatz 5f seite 10, rechte spalte, absatz 2; seite 11, linke spalte, Absatz 6 * *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5073289A (en) * 1989-11-02 1991-12-17 The Curators Of The University Of Missouri Paint stripper composition having reduced volatility containing decanolactone, n-methylpyrrolidone and butyrolactone and method of use
US5661971A (en) * 1994-12-02 1997-09-02 Volkswagen Ag Method for reducing pollutants in the exhaust gas of a multi-cylinder internal combustion engine

Also Published As

Publication number Publication date
AU7564081A (en) 1982-04-01
CA1166617A (en) 1984-05-01
ES8205940A1 (es) 1982-06-16
BR8106013A (pt) 1982-06-08
DE3036130A1 (de) 1982-05-06
JPS5786543A (en) 1982-05-29
ES504050A0 (es) 1982-06-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: PLETKA, HANS-DIETER, DR.

Inventor name: KOBERSTEIN, EDGAR, DR.

Inventor name: VOELKER, HERBERT

Inventor name: BOZON, ALFRED