EP1117751A1 - Method for desulphurizing engine fuel on board a motor vehicle - Google Patents

Method for desulphurizing engine fuel on board a motor vehicle

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Publication number
EP1117751A1
EP1117751A1 EP99970108A EP99970108A EP1117751A1 EP 1117751 A1 EP1117751 A1 EP 1117751A1 EP 99970108 A EP99970108 A EP 99970108A EP 99970108 A EP99970108 A EP 99970108A EP 1117751 A1 EP1117751 A1 EP 1117751A1
Authority
EP
European Patent Office
Prior art keywords
fuel
sulfur
motor vehicle
engine
adsorption material
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Withdrawn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
EP99970108A
Other languages
German (de)
French (fr)
Inventor
Eberhard Holder
Roland Kemmler
Martin Matt
Viktor Pfeffer
Carsten Plog
Thomas Stengel
Ralph Stetter
Karl-Heinz Thiemann
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.)
Daimler AG
Original Assignee
DaimlerChrysler AG
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Filing date
Publication date
Application filed by DaimlerChrysler AG filed Critical DaimlerChrysler AG
Publication of EP1117751A1 publication Critical patent/EP1117751A1/en
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
    • C10G25/00—Refining of hydrocarbon oils in the absence of hydrogen, with solid sorbents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S210/00—Liquid purification or separation
    • Y10S210/902—Materials removed

Definitions

  • the invention relates to a method for desulfurizing a motor fuel on board a motor vehicle.
  • Motor fuel is usually desulphurized using large chemical processes in refineries to produce the fuel.
  • Known processes for this are extraction, adsorption (e.g. US 5,360,536), distillation or microbiological processes.
  • the commercial motor fuels in Europe currently have a residual sulfur content of approx. 200 ppm. This is problematic with regard to the sulfur compatibility of modern exhaust gas aftertreatment systems that contain adsorbers and catalysts. Residual sulfur contents of less than 10 ppm should therefore be aimed for.
  • the object of the invention is to provide a method for separating sulfur-containing components from an engine fuel that is suitable for use in mobile systems.
  • only a small construction volume and a low weight should be required for its implementation.
  • the fuel is desulfurized on board the motor vehicle by selective separation of the sulfur-containing fuel components by means of liquid phase adsorption.
  • An adsorption material is used that selectively only adsorbs the sulfur-containing fuel components.
  • solids with a high surface area are used as adsorbents, especially those substances which contain Al, Mg, Si or Ti in oxidic form. Examples include Al 2 0 3 , MgO, Si0 2 , Ti0 2 , zeolites, hydrotalcites or mixed oxides.
  • a metal such as, for example, an alkali metal, an alkaline earth metal, a rare earth metal, or Ag, Cu, Co, Fe, Mn, Ni, V or Zn can also be used.
  • Biogenic materials such as, for example, enzymes can also be used.
  • the sulfur contained in the fuel can be converted into other sulfur compounds by microorganisms that are brought into contact with the fuel.
  • the adsorption material has a temporary separation performance and must be replaced after some time within the maintenance intervals of the vehicle.
  • the adsorption material can also be regenerated on board the motor vehicle, in particular by thermal treatment.
  • the regeneration can advantageously be carried out by thermostatting using the coolant circuit in the vehicle (approx. 80 ° C) or the engine oil circuit (> 100 ° C).
  • the adsorption device and fuel filter can be integrated in one structural unit.
  • Adsorption material and the material for fuel filtering can, for example, be arranged or layered directly next to or on top of one another.
  • the low-sulfur fuel is particularly suitable for adding to a lean-burn gasoline engine.
  • the addition of low-sulfur diesel fuel can reduce the particle emissions in the exhaust gas.
  • the low-sulfur fuel can also be used as a reducing agent for denitrification catalysts in lean exhaust gas.
  • Another application of the low-sulfur fuel obtained with the method according to the invention is for the desulfation of a catalyst in an exhaust gas aftertreatment system of an engine.
  • sulfur accumulates on the surface of the catalytic converter from time to time, which is removed by regeneration (desorption). This can only be done with low sulfur exhaust gas.
  • the equipment required to carry out the method according to the invention is low. As a result, the construction volume and weight can also be kept small.
  • the method according to the invention is therefore suitable for use in all mobile systems such as passenger or commercial vehicles or in rail-bound vehicles.
  • Another advantage of the method according to the invention is that the low-sulfur fuel fraction is available on board immediately when the engine is started. An additional storage tank for low-sulfur fuel especially for the cold start phase can therefore be dispensed with.
  • the low-sulfur fuel obtained can either be used directly or stored in a storage container.
  • the method according to the invention can be used for all motor fuels, in particular petrol or diesel fuels, kerosene or methanol.
  • Fig. 1 shows a first structure for performing the method according to the invention
  • 2 shows a second structure for carrying out the method according to the invention
  • Fig. 3 shows an adsorption device for performing the invention
  • Fig. 4 shows an experimental setup for determining the adsorber properties and adsorber capacity
  • Fig. 5 shows the effect of the fuel sulfur content on the NO x conversion
  • the adsorption device can be connected in series (Fig. 1) or as a bypass to the normal fuel supply (Fig. 2) after the fuel pump.
  • FIG. 1 An arrangement with a series connection of fuel pump and adsorption device is shown in FIG. 1.
  • the fuel is removed from the fuel tank KT by means of an electric fuel pump KP, then passes through the adsorption device AD according to the invention before it is fed to the engine via the injection nozzle ED.
  • the intake pipe of the engine is labeled AR.
  • all fuel supplied to the engine is desulfurized.
  • a valve V can be used to switch between the normal branch without an adsorption device and the branch with an adsorption device. This makes it possible to use desulfurization only in certain operating phases of the engine. For example, desulphurization can only be activated when the engine is lean and when the adsorber catalyst contained in the exhaust gas aftertreatment system is desulfated.
  • the bypass circuit shown can increase the mileage of the adsorption device or make it smaller.
  • FIG. 3 shows a schematic representation of an adsorption device in the form of a separation column, the interior of which is filled with the adsorption material.
  • the sulfur-containing fuel mixture to be separated is added undiluted to the entrance of the separation column and to the adsorption material.
  • the sulfur-containing fuel components are selectively adsorbed on the adsorption material.
  • the non-adsorbed, sulfur-free, (generally low-boiling) fuel components leave the separation column as an eluate at the opposite end.
  • the separation is surrounded by an annular channel through which a heat transfer medium flows to temper the separation column.
  • the fuel is taken from a storage vessel and fed through the thermostated adsorption column via an HPLC pump (max. Throughput 10 ml / min).
  • HPLC pump max. Throughput 10 ml / min.
  • the eluate can be examined offline using a gas chromatograph and X-ray fluorescence analysis.

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

The invention relates to a method for desulphurizing engine fuel on board a motor vehicle by separating the constituents of said engine fuel containing sulfur using selective liquid-phase adsorption with the aid of an adsorbing material.

Description

Verfahren zur Entschwefelung eines motorischen Kraftstoffs an Bord eines Kraftfahrzeugs Method for desulfurizing a motor fuel on board a motor vehicle
Die Erfindung betrifft ein Verfahren zur Entschwefelung eines motorischen Kraftstoffs an Bord eines Kraftfahrzeugs.The invention relates to a method for desulfurizing a motor fuel on board a motor vehicle.
Die Entschwefelung von motorischem Kraftstoff erfolgt üblicherweise mit großchemischen Verfahren in Raffinerien bei der Herstellung des Kraftstoffs. Bekannte Verfahren hierzu sind Extraktion, Adsorption (z.B. US 5,360,536), Destillation oder mikro- biologische Prozesse. Die handelsüblichen Motorkraftstoffe in Europa weisen derzeit einen Restschwefelgehalt von ca. 200 ppm auf. Dieser ist im Hinblick auf die Schwefelverträglichkeit moderner Abgasnachbehandlungssysteme, die Adsorber und Katalysatoren enthalten, problematisch. Es sind deshalb Restschwefelgehalte von kleiner 10 ppm anzustreben.Motor fuel is usually desulphurized using large chemical processes in refineries to produce the fuel. Known processes for this are extraction, adsorption (e.g. US 5,360,536), distillation or microbiological processes. The commercial motor fuels in Europe currently have a residual sulfur content of approx. 200 ppm. This is problematic with regard to the sulfur compatibility of modern exhaust gas aftertreatment systems that contain adsorbers and catalysts. Residual sulfur contents of less than 10 ppm should therefore be aimed for.
Aufgabe der Erfindung ist es, ein Verfahren zur Abtrennung schwefelhaltiger Komponenten aus einem motorischen Kraftstoff zu schaffen, daß zur Anwendung in mobilen Systemen geeignet ist. Insbesondere sollte zu seiner Durchführung nur ein geringes Bauvolumen und ein geringes Gewicht benötigt werden.The object of the invention is to provide a method for separating sulfur-containing components from an engine fuel that is suitable for use in mobile systems. In particular, only a small construction volume and a low weight should be required for its implementation.
Diese Aufgabe wird mit dem Verfahren nach Anspruch 1 gelöst. Vorteilhafte Ausführungen der Erfindung sind Gegenstand weiterer Ansprüche.This object is achieved with the method according to claim 1. Advantageous embodiments of the invention are the subject of further claims.
Erfindungsgemäß erfolgt die Entschwefelung des Kraftstoffs an Bord des Kraftfahr- zeugs durch selektive Abtrennung der schwefelhaltigen Kraftstoffkomponenten mittels Flüssigphasen-Adsorption. Dabei wird ein Adsorptionsmaterial eingesetzt, daß selektiv im wesentlichen nur die schwefelhaltigen Kraftstoffkomponenten adsorbiert. Als Adsorptionsmittel werden insbesondere Festkörper mit hoher Oberfläche (insbesondere im Bereich von 10 bis 1600 m7g) eingesetzt, vor allem solche Substanzen, die AI, Mg, Si oder Ti in oxidischer Form enthalten. Beispiele hierfür sind Al203, MgO, Si02, Ti02, Zeolithe, Hydrotalcite oder Mischoxide. Ebenfalls eingesetzt werden können Dotierungen der genannten Substanzen mit einem Metall, wie z.B. einem Alkalimetall, einem Erdalkalimetall, einem Seltenerdmetall, oder Ag, Cu, Co, Fe, Mn, Ni, V oder Zn. Auch biogene Materialien wie z.B. Enzyme können eingesetzt werden. Darüber hinaus ist die Umwandlung des im Kraftstoff enthaltenen Schwefels in andere Schwefelverbindungen durch Mikroorganismen, die mit dem Kraftstoff in Kontakt gebracht werden, möglich.According to the invention, the fuel is desulfurized on board the motor vehicle by selective separation of the sulfur-containing fuel components by means of liquid phase adsorption. An adsorption material is used that selectively only adsorbs the sulfur-containing fuel components. In particular, solids with a high surface area (in particular in the range from 10 to 1600 m7 g) are used as adsorbents, especially those substances which contain Al, Mg, Si or Ti in oxidic form. Examples include Al 2 0 3 , MgO, Si0 2 , Ti0 2 , zeolites, hydrotalcites or mixed oxides. Doping of the substances mentioned with a metal, such as, for example, an alkali metal, an alkaline earth metal, a rare earth metal, or Ag, Cu, Co, Fe, Mn, Ni, V or Zn can also be used. Biogenic materials such as, for example, enzymes can also be used. In addition, the sulfur contained in the fuel can be converted into other sulfur compounds by microorganisms that are brought into contact with the fuel.
Das Adsorptionsmaterial weist eine zeitlich begrenzte Trennleistung auf und muß nach einiger Zeit im Rahmen der Wartungsintervalle des Fahrzeugs ausgetauscht werden. In einer alternativen Ausführung kann das Adsorptionsmaterial aber auch an Bord des Kraftfahrzeugs regeneriert werden, insbesondere durch thermische Behandlung. Die Regeneration kann vorteilhaft durch Thermostatisierung mittels des im Fahrzeug vorhandenen Kühlmittelkreisiaufs (ca. 80°C) oder Motorölkreislaufs (>100°C) erfolgen.The adsorption material has a temporary separation performance and must be replaced after some time within the maintenance intervals of the vehicle. In an alternative embodiment, however, the adsorption material can also be regenerated on board the motor vehicle, in particular by thermal treatment. The regeneration can advantageously be carried out by thermostatting using the coolant circuit in the vehicle (approx. 80 ° C) or the engine oil circuit (> 100 ° C).
In einer vorteilhaften Ausführung können Adsorptionsvorrrichtung und Kraftstoffilter in einer baulichen Einheit integriert werden. Dabei können Adsorptionsmaterial und das Material für die Kraftstoffilterung zum Beispiel unmittelbar neben- oder aufeinander angeordnet oder geschichtet werden.In an advantageous embodiment, the adsorption device and fuel filter can be integrated in one structural unit. Adsorption material and the material for fuel filtering can, for example, be arranged or layered directly next to or on top of one another.
Durch Einsatz des gewonnenen schwefelarmen Kraftstoffs kann die Lebensdauer von modernen Abgasnachbehandlungssystemen wesentlich verlängert werden.By using the low-sulfur fuel obtained, the lifespan of modern exhaust gas aftertreatment systems can be significantly extended.
Der schwefelarme Kraftstoff eignet sich dabei insbesondere zur Zugabe im Magerbetrieb eines Ottomotors.The low-sulfur fuel is particularly suitable for adding to a lean-burn gasoline engine.
Bei einem Dieselmotor kann durch Zugabe von schwefelarmen Dieselkraftstoff die Partikelemission im Abgas gemindert werden. Neben der Anwendung als motorischer Kraftstoff kann der schwefelarme Kraftstoff auch als Reduktionsmittel für Entstickungskatalysatoren in magerem Abgas eingesetzt werden.In the case of a diesel engine, the addition of low-sulfur diesel fuel can reduce the particle emissions in the exhaust gas. In addition to being used as a motor fuel, the low-sulfur fuel can also be used as a reducing agent for denitrification catalysts in lean exhaust gas.
Eine weitere Anwendung des mit dem erfindungsgemäßen Verfahren gewonnenen schwefelarmen Kraftstoffs ist der Einsatz bei der Desulfatisierung eines Katalysators in einem Abgasnachbehandlungssystem eines Motors. Im Abgasnachbehandlungssystem sammelt sich auf der Oberfläche des Katalysators von Zeit zu Zeit Schwefel an, der durch Regeneration (Desorption) entfernt wird. Dies kann nur bei schwefel- armem Abgas erfolgen.Another application of the low-sulfur fuel obtained with the method according to the invention is for the desulfation of a catalyst in an exhaust gas aftertreatment system of an engine. In the exhaust gas aftertreatment system, sulfur accumulates on the surface of the catalytic converter from time to time, which is removed by regeneration (desorption). This can only be done with low sulfur exhaust gas.
Der apparative Aufwand zur Durchführung des erfindungsgemäßen Verfahrens ist gering. Folglich können auch Bauvolumen und Gewicht klein gehalten werden. Das erfindungsgemäße Verfahren eignet sich deshalb für den Einsatz in allen mobilen Systemen wie Personen- oder Nutzfahrzeuge oder in schienengebundenen Fahrzeugen.The equipment required to carry out the method according to the invention is low. As a result, the construction volume and weight can also be kept small. The method according to the invention is therefore suitable for use in all mobile systems such as passenger or commercial vehicles or in rail-bound vehicles.
Ein weiterer Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß die schwefelarme Kraftstofffraktion sofort beim Starten des Motors an Bord zur Verfü- gung steht. Auf einen zusätzlichen Vorratstank für schwefelarmem Kraftstoff speziell für die Kaltstartphase kann deshalb verzichtet werden.Another advantage of the method according to the invention is that the low-sulfur fuel fraction is available on board immediately when the engine is started. An additional storage tank for low-sulfur fuel especially for the cold start phase can therefore be dispensed with.
Der gewonnene schwefelarme Kraftstoff kann entweder direkt genutzt oder in einem Vorratsbehälter gespeichert werden.The low-sulfur fuel obtained can either be used directly or stored in a storage container.
Das erfindungsgemäße Verfahren ist für alle motorischen Kraftstoffe, insbesondere Otto- oder Dieselkraftstoffe, Kerosin oder Methanol einsetzbar.The method according to the invention can be used for all motor fuels, in particular petrol or diesel fuels, kerosene or methanol.
Die Erfindung wird anhand von Zeichnungen näher erläutert. Es zeigen:The invention is explained in more detail with reference to drawings. Show it:
Fig. 1 ein erster Aufbau zur Durchführung des erfindungsgemäßen Verfahrens; Fig. 2 ein zweiter Aufbau zur Durchführung des erfindungsgemäßen Verfahrens; Fig. 3 eine Adsorptionsvorrichtung zur Durchführung des erfindungsgemäßenFig. 1 shows a first structure for performing the method according to the invention; 2 shows a second structure for carrying out the method according to the invention; Fig. 3 shows an adsorption device for performing the invention
Verfahrens Fig. 4 ein Versuchsaufbau zur Bestimmung der Adsorbereigenschaften und Adsor- berkapazität; Fig. 5 die Auswirkung des Kraftstoffschwefelgehalts auf die NOx-Konversion eines4 shows an experimental setup for determining the adsorber properties and adsorber capacity; Fig. 5 shows the effect of the fuel sulfur content on the NO x conversion
Abgasnachbehandlungssystems.Exhaust aftertreatment system.
Die Adsorptionsvorrichtung kann nach der Kraftstoffpumpe in Reihenschaltung (Fig. 1) oder als Bypass zur normalen Kraftstoffversorgung (Fig. 2) geschaltet sein.The adsorption device can be connected in series (Fig. 1) or as a bypass to the normal fuel supply (Fig. 2) after the fuel pump.
Eine Anordnung mit Reihenschaltung von Kraftstoffpumpe und Adsorptionsvorrichtung zeigt Fig. 1. Der Kraftstoff wird mittels elektrischer Kraftstoffpumpe KP aus dem Kraftstofftank KT entnommen, durchläuft anschließend die erfindungsgemäße Adsorptionsvorrichtung AD, bevor er über die Einspritzdüse ED dem Motor zugeführt wird. Das Ansaugrohr des Motors ist mit AR bezeichnet. Bei der hier dargestellten Reihenschaltung wird sämtlicher, dem Motor zugeführter Kraftstoff entschwefelt.An arrangement with a series connection of fuel pump and adsorption device is shown in FIG. 1. The fuel is removed from the fuel tank KT by means of an electric fuel pump KP, then passes through the adsorption device AD according to the invention before it is fed to the engine via the injection nozzle ED. The intake pipe of the engine is labeled AR. In the series connection shown here, all fuel supplied to the engine is desulfurized.
Bei der Bypasschaltung, kann über ein Ventil V zwischen dem normalen Zweig ohne Adsorptionsvorichtung und dem Zweig mit Adsorptionsvorrichtung umgeschaltet werden. Dadurch ist es möglich, die Entschwefelung nur in bestimmten Betriebsphasen des Motors einzusetzen. So kann die Entschwefelung zum Beispiel gezielt nur im Magerbetrieb des Motors und bei der Desulfatisierung des im Abgasnachbehandlungssystem enthaltenen Adsorberkatalysators eingeschaltet werden. Durch die dargestellte Bypasschaltung kann die Laufleistung der Adsorptionsvorrichtung erhöht oder diese kleiner ausgelegt werden.In the bypass circuit, a valve V can be used to switch between the normal branch without an adsorption device and the branch with an adsorption device. This makes it possible to use desulfurization only in certain operating phases of the engine. For example, desulphurization can only be activated when the engine is lean and when the adsorber catalyst contained in the exhaust gas aftertreatment system is desulfated. The bypass circuit shown can increase the mileage of the adsorption device or make it smaller.
Die Fig. 3 zeigt in schematischer Darstellung eine Adsorptionseinrichtung in der Form einer Trennsäule, deren Inneres von dem Adsorptionsmaterial erfüllt ist. Das zu trennende schwefelhaltige Kraftstoffgemisch wird unverdünnt in den Eingang der Trennsäule und an das Adsorptionsmaterial gegeben. An dem Adsorptionsmaterial werden die schwefelhaltigen Kraftstoffkomponenten selektiv adsorbiert. Die nicht adsorbierten, schwefelfreien, (im allgemeinen leichtsiedenden) Kraftstoffkomponenten verlassen als Eluat die Trennsäule am gegenüberliegenden Ende. Die Trenn- säule ist von einem Ringkanal umgeben, der von einem Wärmeträger zur Temperierung der Trennsäuie durchflössen wird.3 shows a schematic representation of an adsorption device in the form of a separation column, the interior of which is filled with the adsorption material. The sulfur-containing fuel mixture to be separated is added undiluted to the entrance of the separation column and to the adsorption material. The sulfur-containing fuel components are selectively adsorbed on the adsorption material. The non-adsorbed, sulfur-free, (generally low-boiling) fuel components leave the separation column as an eluate at the opposite end. The separation The column is surrounded by an annular channel through which a heat transfer medium flows to temper the separation column.
In Fig. 4 ist der Versuchsaufbau zur Bestimmung der Adsorbereigenschaften und der Adsorberkapazität dargestellt. Der Kraftstoff wird einem Vorratsgefäß entnommen und über eine HPLC-Pumpe (max. Durchsatz 10 ml/min) durch die thermostatisierte Adsorptionssäule gefördert. Für eine quantitative Analyse kann das Eluat offline mittels Gaschromatograph und Röntgenfluoreszenzanalyse untersucht werden.4 shows the experimental setup for determining the adsorber properties and the adsorber capacity. The fuel is taken from a storage vessel and fed through the thermostated adsorption column via an HPLC pump (max. Throughput 10 ml / min). For a quantitative analysis, the eluate can be examined offline using a gas chromatograph and X-ray fluorescence analysis.
In Fig. 5 ist die Auswirkung des Kraftstoffschwefelgehalts auf die NOx-Konversion eines Abgasnachbehandlungssystems dargestellt. Auf der Abszisse ist die Betriebsdauer (in Stunden) aufgetragen, auf der Ordinate die NOx-Konversion (in %). Es wurden zwei Meßreihen für die Schwefelgehalte 31 ppm und 130 ppm mit demselben Katalysatortyp aufgenommen. Die Versuche wurden mit einem direkteinspritzenden Ottomotor im Magermixbetrieb (30 Sekunden Magerbetrieb mit λ = 1,5 und 2 Sekunden Fettbetrieb mit λ = 0,75) durchgeführt. Wie aus dem Vergleich der Meßreihen zu erkennen ist, sinkt die Lebensdauer des Katalysators bei erhöhtem Schwefelgehalt drastisch. 5 shows the effect of the fuel sulfur content on the NO x conversion of an exhaust gas aftertreatment system. The operating time (in hours) is plotted on the abscissa, the NO x conversion (in%) on the ordinate. Two series of measurements for the sulfur contents 31 ppm and 130 ppm were recorded with the same type of catalyst. The tests were carried out with a direct-injection gasoline engine in lean-mix operation (30 seconds lean operation with λ = 1.5 and 2 seconds rich operation with λ = 0.75). As can be seen from the comparison of the measurement series, the service life of the catalytic converter drops drastically with an increased sulfur content.

Claims

Patentansprüche: Claims:
1. Verfahren zur Entschwefelung eines motorischen Kraftstoffes an Bord eines Kraftfahrzeugs durch Abtrennung der schwefelhaltigen Komponenten des motorischen Kraftstoffs mittels selektiver Flüssigphasen-Adsorption an einem Adsorp- tionsmaterial.1. A process for the desulfurization of a motor fuel on board a motor vehicle by separating the sulfur-containing components of the motor fuel by means of selective liquid phase adsorption on an adsorption material.
2. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Adsorptionsmaterial eine innere Oberfläche von 10 bis 1600 m7g aufweist.2. The method according to claim 1 or 2, characterized in that the adsorption material has an inner surface of 10 to 1600 m7g.
3. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Adsorptionsmaterial AI, Mg, Si oder Ti in oxidischer Form enthält, wie z.B. Al203, MgO, Si02, Ti02, Zeolithe, Hydrotalcite, Mischoxide oder Dotierungen der genannten Substanzen mit einem Metall, wie z.B. Alkalimetalle, Erdalkalimetalle, Seltenerdmetall, Ag, Cu, Co, Fe, Mn, Ni, V, Zn.3. The method according to any one of the preceding claims, characterized in that the adsorption material contains Al, Mg, Si or Ti in oxidic form, such as Al 2 0 3 , MgO, Si0 2 , Ti0 2 , zeolites, hydrotalcites, mixed oxides or doping the substances mentioned with a metal, such as alkali metals, alkaline earth metals, rare earth metal, Ag, Cu, Co, Fe, Mn, Ni, V, Zn.
4. Verfahren nach einem der Ansprüche 1 oder 2 , dadurch gekennzeichnet, daß das Adsorptionsmaterial ein biogenes Material, wie z.B. ein Enzym, ist oder Mikroorganismen enthält.4. The method according to any one of claims 1 or 2, characterized in that the adsorption material is a biogenic material, such as. is an enzyme, or contains microorganisms.
5. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Kraftstoff ein Otto- oder Dieselkraftstoff oder Kerosin oder Methanol ist.5. The method according to any one of the preceding claims, characterized in that the fuel is a petrol or diesel fuel or kerosene or methanol.
6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der gewonnene schwefelarme Kraftstoff direkt genutzt wird oder in einem Vorratsbehälter aufgefangen wird. 6. The method according to any one of the preceding claims, characterized in that the low-sulfur fuel obtained is used directly or is collected in a storage container.
7. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der gewonnene schwefelarme Kraftstoff als Reduktionsmittel für Entsti- ckungskatalysatoren im mageren Abgas eingesetzt wird.7. The method according to any one of the preceding claims, characterized in that the low-sulfur fuel obtained is used as a reducing agent for removal catalysts in the lean exhaust gas.
8. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Adsorptionsmaterial in Reihenschaltung oder in Bypasschaltung zur Kraftstoffpumpe angeordnet ist.8. The method according to any one of the preceding claims, characterized in that the adsorption material is arranged in series connection or in a bypass connection to the fuel pump.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß der bei der Bypass- Schaltung gewonnene schwefelarme Kraftstoff im Magerbetrieb des Motors oder bei der Desulfatisierung des Abgasnachbehandlungssystems des Motors eingesetzt wird.9. The method according to claim 8, characterized in that the low-sulfur fuel obtained in the bypass circuit is used in lean operation of the engine or in the desulfation of the exhaust gas aftertreatment system of the engine.
10. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das Adsorptionsmaterial zusammen mit dem Material für die Kraftstoffilte- rung in einer baulichen Einheit integriert ist.10. The method according to any one of the preceding claims, characterized in that the adsorption material is integrated together with the material for the fuel filtering in a structural unit.
1 1. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß das beladene Adsorptionsmaterial an Bord des Kraftfahrzeugs regeneriert wird oder ausgetauscht wird.1 1. The method according to any one of the preceding claims, characterized in that the loaded adsorbent material is regenerated on board the motor vehicle or is replaced.
12. Verfahren nach Anspruch 1 1 , dadurch gekennzeichnet, daß als Wärmequelle für die Regenerierung des Adsorptionsmaterials das Motoröl oder das Motorkühlmittel des Kraftfahrzeugs eingesetzt wird. 12. The method according to claim 1 1, characterized in that the engine oil or the engine coolant of the motor vehicle is used as a heat source for the regeneration of the adsorbent material.
EP99970108A 1998-10-02 1999-10-01 Method for desulphurizing engine fuel on board a motor vehicle Withdrawn EP1117751A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19845397A DE19845397C2 (en) 1998-10-02 1998-10-02 Method for desulfurizing a motor fuel on board a motor vehicle
DE19845397 1998-10-02
PCT/EP1999/007267 WO2000020531A1 (en) 1998-10-02 1999-10-01 Method for desulphurizing engine fuel on board a motor vehicle

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EP (1) EP1117751A1 (en)
AU (1) AU1151500A (en)
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WO (1) WO2000020531A1 (en)

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US6749754B1 (en) 2004-06-15
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WO2000020531A1 (en) 2000-04-13
DE19845397C2 (en) 2000-09-14

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