GB2333048A - A composition for regenerating a catalytic converter - Google Patents

A composition for regenerating a catalytic converter Download PDF

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Publication number
GB2333048A
GB2333048A GB9800529A GB9800529A GB2333048A GB 2333048 A GB2333048 A GB 2333048A GB 9800529 A GB9800529 A GB 9800529A GB 9800529 A GB9800529 A GB 9800529A GB 2333048 A GB2333048 A GB 2333048A
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Prior art keywords
rejuvenating
cleaning composition
vehicle
engine
catalyst
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GB9800529A
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GB9800529D0 (en
GB2333048B (en
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Hugh F Collins
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
    • B01J38/50—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
    • B01J38/56—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/04—Gas or vapour treating; Treating by using liquids vaporisable upon contacting spent catalyst
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
    • B01J38/50—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J38/00—Regeneration or reactivation of catalysts, in general
    • B01J38/48—Liquid treating or treating in liquid phase, e.g. dissolved or suspended
    • B01J38/50—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids
    • B01J38/52—Liquid treating or treating in liquid phase, e.g. dissolved or suspended using organic liquids oxygen-containing
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/04—Exhaust treating devices having provisions not otherwise provided for for regeneration or reactivation, e.g. of catalyst
    • 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
    • F01N2430/04—Influencing exhaust purification, e.g. starting of catalytic reaction, filter regeneration, or the like, by controlling engine operating characteristics by adding non-fuel substances to combustion air or fuel, e.g. additives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Detergent Compositions (AREA)
  • Catalysts (AREA)

Abstract

A composition, which may be used in situ while the engine is running, comprises an oxygen donor and a source of hydrocarbon. The preferred composition contains xylene, isopropanol and acetone, together with one or more metallic trace elements. The composition may be fed to the running engine, interrupting the normal fuel supply.

Description

DESCRIPTION A REJUVENATING AND/OR CLEANING AGENT The present invention relates to a rejuvenating and/or cleaning agent, and more particularly to a rejuvenating and/or cleaning agent for a catalyst of the type used in a vehicle catalytic converter, and to a method of rejuvenating and/or cleaning the catalyst of a vehicle's catalytic converter.
Catalytic converters are now fitted to most internal combustion engines, (e. g. petrol engine) vehicles. The catalytic converters usually comprise a precious metal catalyst, for example, the noble metals such as platinum and/or rhodium, which catalyst initiates conversion of harmful exhaust emissions such as, for example, nitrogen oxides, carbon monoxide and hydrocarbons into less harmful products such as, for example, carbon dioxide, nitrogen and water.
However, these catalysts are easily poisoned and/or are rendered less effective by, for example, a build up of carbonaceous deposits on the catalysts surface.
A number of processes for rejuvenating and/or cleaning catalysts are known. Most, however, require the catalyst to be removed from the vehicle.
It is an aim of the present invention to develop a composition and method for cleaning or rejuvenating a catalyst of the type found in a catalytic converter of a vehicle without having to remove it from the vehicle.
The applicants have determined that a catalyst in a vehicle catalytic converter can be rejuvenated and/or cleaned in situ by passing a cleaning composition, preferably under pressure, into the vehicle engine whilst running the engine at idle, the catalytic converter having first been brought up to working temperature.
According to a first aspect of the present invention there is provided a method of rejuvenating and/or cleaning a catalyst of a catalytic converter, in situ, in a vehicle, the method comprising : (1) bringing a vehicle engine to working temperature ; (ii) disconnecting the vehicle's fuel line from the engine ; (iii) connecting the engine to a means for feeding a rejuvenating and/or cleaning composition thereto ; and (iv). feeding the cleaning composition into the engine whilst the engine is running at a temperature high enough to effect cleaning of the catalyst.
The rejuvenating and/or cleaning is thus carried out, in situ, but whilst the engine fuel supply is disconnected from the engine, the engine being independently run on the composition.
Preferably the cleaning composition is fed into the injection system, through the combustion engine, through the catalytic converter and out through the exhaust system into the atmosphere.
Preferably the cleaning composition is combustible. Preferably the engine is run at a temperature of from 60 to 90 C, more preferably at or about the vehicle manufacturers recommended operating temperature According to a further aspect of the present invention there is provided a rejuvenating and/or cleaning composition for a catalyst of a vehicle catalytic converter, comprising : i. at least one hydrocarbon source ; and ii. at least one oxygen donor.
In some cases the oxygen donor and the hydrocarbon source can be one and the same compound.
Preferred compositions include one or more organic solvents as hydrocarbon source and/or oxygen donor. Examples include aliphatic alcohols e. g. iso propyl alcohol, ketones, e. g. acetone, aromatic hydrocarbons, e. g. xylene, aliphatic hydrocarbons, e. g. alkanes, paraffin (kerosene) and lamp oil. Clearly not all of the compounds are oxygen donors and the composition should include at least one oxygen donor.
A preferred composition comprises one or more organic solvents selected from isopropyl alcohol, acetone xylene and paraffin The first two of these components are both oxygen donors and hydrocarbons Preferably the composition comprises all four of these ingredients Preferably the components of thls mixture present n the following amounts (by weight %) D-efer ed More b fie-rad Most D eferred py 1 5 25 20 e x Da 5 2 The composition also creferably comprises one o more and more preferabl all of the following race elements @@@@@@ @@@@@@@@ f) ure sur Stron@um Sr Bismuth @@ Cadmium Cd = ! hu Nickel Ni Manganese Mn Imn Na 7rnc Na Zmc------------2 Cakcmm Ca Copper Cu Cu Colbalc Co Pocasstum K Chromium Cr Magnesium Mg @@@@@@ As in sol Annmonv So Vanadium V @@tamium T@ 3ervlltum Bc Silicon S@ phnphors--------E @ingsten - Molvodenum Mo These trace elements may each be present in an amount of 30% of the figure shown for each trace element in the following table. A particularly preferred rejuvenating and/or cleaning composition includes one or more of the following trace elements in the amounts stated in the table : Preferred % of trace elements Fleme@@ pom Strentium 0.01 Blsmuth 0.05 Cadmium 0.01 Bacium 0.01 N n ns n ns @@@@ n l es Sodium 4.03 Zinc 0.05 alumimium 0.19 Caleium 0.14 Capper 0.02 Lesd 0.06 1i n n Colbalt 0.01 Ma < -;itmi------0.9! Chmmium 0.01 Ma@@@ium 0.05 Artenie O f15 @@@ 0.34 Antmony 0.10 Yanadium 0.07 Litanium 0.01 Bervllium 0.01 Silicon 0"1 a Phomboms 0.17 "'"r"---OJ Mnlvadrnum ~ 0 01 without wishing to be bound by theory it is believed that the composition functions because on combustion it produces (i) oxygen which helps oxidise any carbonaceous layer present on the catalyst surface and which inhibits the function of the catalyst, and/or (ii) an organic acid (e. g. carboxylic acid) vapour which aids in cleaning the surface of the catalyst.
According to a further aspect of the present invention there is provided a rejuvenating and/or cleaning composition comprising a hydrocarbon source and an oxygen donor wherein said composition generates an organic acid, e. g. a carboxylic acid, vapour on combustion.
Although the invention is mainly for use with vehicles which run on unleaded fuel at least some of the compositions work with contamination caused by leaded fuels. For example lead contaminant has been removed from a catalyst in a catalytic converter using a composition of the invention.
The invention will be further described by way of example only with reference to the following example and test data.
Example 1.
An engine of a 1991 Nissan 300 ZX with 72, 000 miles on the clock, and having a catalytic converter which had become poisoned, was run until the engine, and more importantly the exhaust system, reached normal operating temperature (approximately 80 C). The fuel lines feeding the engine were then disconnected and in place of the fuel lines the engine was connected to an injection system purge machine and 1 litre of a rejuvenating and/or cleaning composition containing the following : isopropyl alcohol 20% acetone 20% xylene Sol paraffin 10% and the trace elements listed in the Table above headed"preferred k of trace elements approximately in the amounts shown in the Table, was introduced under pressure into the engine. The machine circulated the composition (which is a liquid at room temperature) under pressure via the fuel injection system. The rejuvenating and/or cleaning composition burned in the engine and the combustion gases and any unburned fluid travelled over the catalyst of the catalytic converter.
In tests (analysis was by a calibrated four gas analyzer) the composition of example 1 was found to have a significant effect on tail pipe emissions as illustrated in Table 1.
Example 1 BeforeAfrer CO% 2. 71 0. 02 HCppm 263 ; 0 Example 2 Example 1 was repeated with a 1992 Vauxhall Astra with 80, 000 miles on the clock. The results are set out in Table 2 below which indicates significant effect, on tail pipe emissions, of the rejuvenation and/or cleaning.
Table 2 After 0. 02 HC ppm 110 8 Example 3 Example 1 was repeated with a 1996 Renault Megane with 12, 000 miles on the clock. The results are set out in Table 3 below which indicates significant effect, on tail pipe emissions, of the rejuvenation and/or cleaning.
Table 3 Befbr:Af-rer CO% 0. 00 0. 0 ! HC ppm 72 27 *"Before"means-Before rejuvenating and/or cleaning with the composition of the invention.
Example 4 Example 1 was repeated with a Peugeot 605.
The results are set out in Table 4 below which indicates significant effect, on tail pipe emissions, of the rejuvenation and/or cleaning.
Example 5 Example 1 was repeated with a Ford Fiesta.
The results are set out in Table 5 below which indicates significant effect, on tail pipe emissions, of the rejuvenation and/or cleaning.
TABLE 4
CO $CO2 HC O2 Starting value 0. 0072% 7.1% 36ppm 10.0% after treatment 0. 002% 13.6% 2ppm 7.6% TABLE 5
CO CO2 HC 02 Starting value 0. 367%% 15.3% 116ppm 2. 5% after treatment 0. 0230 15. 6% 49ppm 2. 2% follow up 0. 030% 15. 9% 63ppm 2. 0% follow up 0. 008% 15. 3k 23ppm 5. 2h follow up 0. 081% 47ppm The"follow up"measurements were carried out approximately 1000 mile intervals.
These examples indicate that the catalyst is operating more effectively after treatment, indicating the catalyst has been rejuvenated and/or cleaned.

Claims (27)

1. A rejuvenating and/or cleaning composition for a catalyst of a vehicle catalytic converter, comprising : i. at least one hydrocarbon source ; and ii. at least one oxygen donor.
2. A rejuvenating and/or cleaning composition comprising a hydrocarbon source and an oxygen donor wherein said composition generates an organic acid vapour on combustion.
3. A rejuvenating and/or cleaning composition as claimed in claim 2, wherein the organic acid vapour includes a carboxylic acid vapour.
4. A rejuvenating and/or cleaning composition as claimed in claim 1, 2 or 3, wherein the oxygen donor or one of the oxygen donors and the hydrocarbon source or one of the hydrocarbon sources are one and the same compound.
5. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims, including one or more organic solvents as hydrocarbon source and/or oxygen donor.
6. A rejuvenating and/or cleaning composition as claimed in claim 5, wherein the one or more organic solvents include aliphatic alcohols, ketones, aromatic hydrocarbons and/or aliphatic hydrocarbons.
7. A rejuvenating and/or cleaning composition as claimed in claim 5 or 6, wherein the one or more organic solvents include isopropyl alcohol.
8. A rejuvenating and/or cleaning composition as claimed in claim 5, 6 or 7, wherein the one or more organic solvents include acetone.
9. A rejuvenating and/or cleaning composition as claimed in any one of claims 5 to 8, wherein the one or more organic solvents include xylene.
10. A rejuvenating and/or cleaning composition as claimed in claim 5 or 6, wherein the one or more organic solvents include isopropyl alcohol, acetone and xylene.
11. A rejuvenating and/or cleaning composition as claimed in any one of claims 5 to 10, wherein the one or more organic solvents include alkanes, paraffin (kerosene) and/or lamp oil.
12. A rejuvenating and/or cleaning composition as claimed in claim 5, wherein the one or more organic solvents are selected from isopropyl alcohol, acetone, xylene and paraffin.
13. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims comprising isopropyl alcohol, acetone, xylene and paraffin.
14. A rejuvenating and/or cleaning composition as claimed in claim 13, comprising 10-40 wt% isopropyl alcohol, 10-40 wt% acetone, 35-65 wt% xylene and 5-15 wt% paraffin.
15. A rejuvenating and/or cleaning composition as claimed in claim 13, comprising 15-25 wt% isopropyl alcohol, 15-25 wt% acetone, 45-55 wt% xylene and 7-12 wt% paraffin.
16. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims, comprising one or more trace elements selected from Sr, Bi, Cd, Ba, Ni, Mn, Fe, Na, Zn, Al, Ca, Cu, Pb, Co, K, Cr, Mg, As, Sn, Sb, V, Ti, Be, Si, P, W, and Mo.
17. A rejuvenating and/or cleaning composition as claimed in claim 16, wherein those trace elements which are present are each present in an amount of 30% of the figure shown for the respective amount in the following table : Sr (O. Olppm), Bi (0. 05ppm), Cd (O. Olppm), Ba (O. Olppm), Ni (0. 07ppm), Mn (0. 05ppm), Fe (0. 16ppm), Na (4. 03ppm), Zn (0. 05ppm), Al (0. 19ppm), Ca (0. 14ppm), Cu (0. 02ppm), Pb (0. 06ppm), Co (O. Olppm), K (15. 59ppm), Cr (O. Olppm), Mg (0. 05ppm), As (0. 05ppm), Sn (0. 34ppm), Sb (O. lOppm), V (C. 07ppm), Ti (O. Olppm), Be (O. Olppm), Si (0. 39ppm), P (0. 17ppm), W (0. 14ppm), and Mo (O. Olppm).
18. The use of a rejuvenating and/or cleaning composition as defined in any one of claims 1 to 17 to rejuvenate and/or clean a catalyst in a vehicle catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle.
19. A method of rejuvenating and/or cleaning a catalyst in a vehicle catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle, said method comprising : (i) bringing the catalytic converter up to working temperature ; and then (ii) passing a rejuvenating and/or cleaning composition as defined in any one of claims 1 to 17 into an engine of the vehicle whilst running the engine at idle.
20. A method as claimed in claim 19, wherein the rejuvenating and/or cleaning composition is passed into the vehicle engine under pressure.
21. A method of rejuvenating and/or cleaning a catalyst of a catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle, the method comprising : (i) bringing an engine of the vehicle to working temperature ; (ii) disconnecting the vehicle's fuel line from the engine ; (iii) connecting the engine to a means for feeding a rejuvenating and/or cleaning composition thereto ; and (iv) feeding the cleaning composition into the engine whilst the engine is running at a temperature high enough to effect cleaning of the catalyst.
22. A method as claimed in claim 21, wherein the rejuvenating and/or cleaning composition is combustible.
23. A method as claimed in claim 21 or 22, wherein the rejuvenating and/or cleaning composition is as defined in any one of claims 1 to 17.
24. A method as claimed in any one of claims 19 to 23, wherein the rejuvenating and/or cleaning composition is fed into the injection system, through the engine, through the catalytic converter and out through the exhaust system into the atmosphere.
25. A method as claimed in any one of claims 19 to 24, comprising running the engine at a temperature of from 60 to 90 C.
26. A method as claimed in claim 25, comprising running the engine at or about the vehicle manufacturer's recommended operating temperature.
27. A rejuvenating and/or cleaning composition and/or a method substantially as hereinbefore described in any one of Examples 1 to 5.
27. A rejuvenating and/or cleaning composition and/or a method substantially as hereinbefore described in any one of Examples 1 to 5.
Amendments to the claims have been filed as follows
1. A rejuvenating and/or cleaning composition for a catalyst of a vehicle catalytic converter, comprising : i. at least one hydrocarbon source ; and ii. at least one oxygen donor.
2. A rejuvenating and/or cleaning composition comprising a hydrocarbon source and an oxygen donor wherein said composition generates an organic acid vapour on combustion.
3. A rejuvenating and/or cleaning composition as claimed in claim 2, wherein the organic acid vapour includes a carboxylic acid vapour.
4. A rejuvenating and/or cleaning composition as claimed in claim 1, 2 or 3, wherein the oxygen donor or one or the oxygen donors and the hydrocarbon source or one of the hydrocarbon sources are one and the same compound.
5. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims, including one or more organic solvents as hydrocarbon source and/or oxygen donor.
6. A rejuvenating and/or cleaning composition as claimed in claim 5, wherein the one or more organic solvents include aliphatic alcohols, ketones, aromatic hydrocarbons and/or aliphatic hydrocarbons.
7. A rejuvenating and/or cleaning composition as claimed in claim 5 or 6, wherein the one or more organic solvents include isopropyl alcohol.
8. A rejuvenating and/or cleaning composition as claimed in claim 5, 6 or 7, wherein the one or more organic solvents include acetone.
9. A rejuvenating and/or cleaning composition as claimed in any one of claims 5 to 8, wherein the one or more organic solvents include xylene.
10. A rejuvenating and/or cleaning composition as claimed in claim 5 or 6, wherein the one or more organic solvents include isopropyl alcohol, acetone and xylene.
11. A rejuvenating and/or cleaning composition as claimed in any one of claims 5 to 10, wherein the one or more organic solvents include alkanes, paraffin (kerosene) and/or lamp oil.
12. A rejuvenating and/or cleaning composition as claimed in claim 5, wherein the one or more organic solvents are selected from isopropyl alcohol, acetone, xylene and paraffin.
13. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims comprising isopropyl alcohol, acetone, xylene and paraffin.
14. A rejuvenating and/or cleaning composition as claimed in claim 13, comprising 10-40 wt% isopropyl alcohol, 10-40 wt% acetone, 35-65 wt% xylene and 5-15 wt% paraffin.
15. A rejuvenating and/or cleaning composition as claimed in claim 13, comprising 15-25 wt% isopropyl alcohol, 15-25 wt% acetone, 45-55 wtt xylene and 7-12 wt paraffin.
16. A rejuvenating and/or cleaning composition as claimed in any one of the preceding claims, comprising one or more trace elements selected from Sr, Bi, Cd, Ba, Ni, Mn, Fe, Na, Zn, Al, Ca, Cu, Pb, Co, K, Cr, Mg, As, Sn, Sb, V, Ti, Be, Si, P, W, and Mo.
17. A rejuvenating and/or cleaning composition as claimed in claim 16, wherein those trace elements which are present are each present in an amount of 30% of the figure shown for the respective element in the following table : Sr (O. Olppm), Bi (0. 05ppm), Cd (O. Olppm), Ba (O. Olppm), Ni (0. 07ppm), Mn (0. 05ppm), Fe (0. 16ppm), Na (4. 03ppm), Zn (0. 05ppm), Al (0. 19ppm), Ca (0. 14ppm), Cu (0. 02ppm), Pb (0. 06ppm), Co (O. Olppm), K (15. 59ppm) Cr (O. Olppm), Mg (0. 05ppm), As (0. 05ppm), Sn (0. 34ppm), Sb (O. lOppm), V (0. 07ppm), Ti (O. Olppm), Be (O. Olppm), Si (0. 39ppm), P (0. 17ppm), W (0. 14ppm), and Mo (O. Olppm).
18. The use of a rejuvenating and/or cleaning composition as defined in any one of claims 1 to 17 to rejuvenate and/or clean a catalyst in a vehicle catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle.
19. A method of rejuvenating and/or cleaning a catalyst in a vehicle catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle, said method comprising : (i) bringing the catalytic converter up to working temperature ; and then (ii) passing a rejuvenating and/or cleaning composition as defined in any one of claims 1 to 17 into an engine of the vehicle whilst running the engine at idle.
20. A method as claimed in claim 19, wherein the rejuvenating and/or cleaning composition is passed into the vehicle engine under pressure.
21. A method of rejuvenating and/or cleaning a catalyst of a catalytic converter, in situ, in a vehicle i. e. without removal of the catalyst from the vehicle, the method comprising : (i) bringing an engine of the vehicle to working temperature ; (ii) disconnecting the vehicle's fuel line from the engine ; (iii) connecting the engine to a means for feeding a rejuvenating and/or cleaning composition thereto ; and (iv) feeding the cleaning composition into the engine whilst the engine is running at a temperature high enough to effect cleaning of the catalyst.
22. A method as claimed in claim 21, wherein the rejuvenating and/or cleaning composition is combustible.
23. A, method as claimed in claim 21 or 22, wherein the rejuvenating and/or cleanina composition is as defined in any one of claims 1 to 17.
24. A method as claimed in any one of claims 19 to 23, wherein the rejuvenating and/or cleaning composition is fed into the injection system, through the engine, through the catalytic converter and out through the exhaust system into the atmosphere.
25. A method as claimed in any one of claims 19 to 24, comprising running the engine at a temperature of from 60 to 90 C.
26. A method as claimed in claim 25, comprising running the engine at or about the vehicle manufacturer's recommended operating temperature.
GB9800529A 1998-01-13 1998-01-13 A rejuvenating and/or cleaning agent Expired - Lifetime GB2333048B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001085311A1 (en) * 2000-05-10 2001-11-15 Siemens Aktiengesellschaft Method and device for the catalytic conversion of a substance
US6843813B1 (en) 2000-06-07 2005-01-18 Hugh Frederick Collins Rejuvenation and/or cleaning of catalysts
WO2021064346A1 (en) * 2019-10-02 2021-04-08 Cataclean Global Ltd Composition for cleaning combustion engine systems

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