CN1351518A - Composition usable as NOx trap, based on manganese and an alkaline-earth or a rare earth and use in the treatment of exhaust gases - Google Patents
Composition usable as NOx trap, based on manganese and an alkaline-earth or a rare earth and use in the treatment of exhaust gases Download PDFInfo
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- CN1351518A CN1351518A CN00807907A CN00807907A CN1351518A CN 1351518 A CN1351518 A CN 1351518A CN 00807907 A CN00807907 A CN 00807907A CN 00807907 A CN00807907 A CN 00807907A CN 1351518 A CN1351518 A CN 1351518A
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- 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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/63—Platinum group metals with rare earths or actinides
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/32—Manganese, technetium or rhenium
- B01J23/34—Manganese
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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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/202—Alkali metals
- B01D2255/2022—Potassium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/204—Alkaline earth metals
- B01D2255/2042—Barium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/2073—Manganese
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
The invention concerns a composition usable as NOx trap in the treatment of exhaust gases. Said composition comprises a support and an active phase, and is characterised in that the active phase is based on manganese and at least another element A selected among alkaline-earths and rare earths, and it has or is capable of having a specific surface area of at least 10m<2>/g after being calcined for 8 hours at 800 DEG C. The support can be based on alumina or alumina stabilised with silicon, zirconium, barium or a rare earth; or based on silica or silica and titanium oxide.
Description
The invention relates to a composition based on manganese and alkaline earth or rare earth for use as a Nox trap and its use in the treatment of exhaust gases.
Nitrogen Oxides (NO) in particular from the exhaust gases of motor vehicles can be reduced by means of a "three-way" catalyst which utilizes the reducing gas present in the exhaust gas mixture stoichiometricallyx) And (4) discharging. Any excess oxygen will result in a significant deterioration of the catalyst performance.
However, some engines, such as diesel engines or lean-burn gasoline engines, can conserve fuel, but emit exhaust gases that always contain a large excess of oxygen, e.g., at least 5%. Thus, in this case, the standard three-way catalyst is for NOxThe emissions are useless. In addition, the tightening of automotive post-combustion regulations has mandated NO limitsxTo the exclusion, these regulations have now been extended to such engines.
To overcome this problem, the so-called NO has been proposedxSystems of trapping agents which oxidize NO to NO2Then absorb the NO formed2. Under certain conditions, NO is released2Then reduced to N by a reducing substance contained in the exhaust gas2. However, these NOxCollectors have some disadvantages. They do not perform satisfactorily at high temperatures and therefore they have poor ageing properties. In addition, they may have poor sulfur resistance.
It is therefore an object of the present invention to provide NO with improved ageing resistancexA trapping agent.
It is also an object of the present invention to provide NO with improved sulfur resistancexA trapping agent.
For this purpose, the compounds of the invention are used as NOxThe composition of the collector comprises a support and an active phase, characterized in that the active phase is based on manganese and at least one other element A selected from alkaline earths and rare earths, and in that it has or can have at least 10m after calcination at 800 ℃ for 8 hours2Specific surface area in g.
Further characteristics, details and advantages of the invention will become clearer from the following description of an illustrative embodiment thereof, given by way of example only.
The compositions of the present invention comprise a carrier and an active phase. The term "support" shall be taken in its broadest sense, i.e. the main element (or elements) in its composition, either without catalytic activity or trapping activity, or without catalytic or trapping activity equivalent to the activity; and onto which the other element or elements are deposited. For the sake of brevity, the remainder of this description will discuss the carrier and the active or supported phase, but it is to be understood that the scope of the invention also includes the case where one of the elements that is part of the active or supported phase is present in the carrier, for example, has been introduced into the carrier during the preparation of the carrier itself.
The active phase of the composition is based on manganese and at least one element a. Such element a may be an alkali metal or an alkaline earth metal. Barium may be used as the alkaline earth element. More particularly, the rare earth element may be selected from cerium, terbium, gadolinium, samarium, neodymium and praseodymium. The total content of manganese, alkaline earth or rare earth may be in the range of 1% to 50%, more particularly in the range of 5% to 30%. These proportions are expressed in atomic% relative to the sum of the moles of the elements contained in the support oxide and supported phase. The respective contents of manganese, alkaline earth or rare earth may also be in a wide range; in particular, the manganese content may be equal to or close to the content of element a.
The present invention includes the following cases: the active phase is substantially manganese and the at least one or more elements a are selected from alkaline earths and rare earths. By "substantially" it is meant that the composition of the invention may have NO in the absence of any element (e.g. noble metal type elements or other metals commonly used in catalysis) in the active phase other than manganese and the said element(s) axTrapping activity.
As mentioned above, one characteristic of the composition is that it has or can have at least 10m after calcination at 800 ℃ for 8 hours2Specific surface area in g. In particular, such a surface may have at least 20m after calcination at the same temperature for the same time2Specific surface area in g. More particularly, the specific surface area is at least 80m2A/g, still more particularly at least 1 after calcination at 800 ℃ for 8 hours00m2/g。
The term "specific surface area" refers to the BET specific surface area as determined by nitrogen adsorption according to ASTM D3663-78, standard established by the BRUNAUER-EMMETT-TELLER method described in the journal "proceedings of the American chemical society" 60, 309 (1938).
This surface property is obtained by selecting a suitable support with a sufficiently high specific surface area.
Such supports may be based on alumina. Any type of alumina that has a specific surface area sufficient for use in catalysis can be used. Mention may be made of aluminas formed by the rapid dehydration of at least onealuminium hydroxide, such as bayerite, gibbsite, nordstrandite, and/or at least one aluminium oxyhydroxide, such as boehmite, pseudoboehmite or diaspore.
In a particular embodiment of the invention, stabilized alumina is used. Stabilizing elements which may be mentioned include rare earths, barium, silicon and zirconium. Particular rare earths which may be mentioned are cerium, lanthanum or lanthanum-neodymium mixtures.
The stabilized alumina is prepared in a manner known per se, in particular by impregnating it with a solution of salts of the abovementioned stabilizing elements, such as nitrates, or by calcining it after drying the alumina precursor together with the salts of these elements.
Another method for preparing alumina which may be cited is that in which the alumina in powder form, formed by rapid dehydration of aluminium hydroxide or aluminium oxyhydroxide, is subjected to an ageing treatment in the presence of a stabilizer comprising a lanthanum compound and optionally a neodymium compound, said compound being more particularly a salt. The alumina may be suspended in water and then aged by heating to a temperature in the range of, for example, 70 c to 110 c. After aging, the alumina is heat treated.
Another preparation method consisted of a similar treatment, but using barium.
The amount of stabilizer, expressed in terms of the weight of stabilizing oxide relative to the stabilized alumina, is generally in the range from 1.5% to 15%, more particularly in the range from 2.5% to 11%.
The support may also be silica-based.
It may also be silica and titania based, with an atomic ratio Ti/Ti + Si in the range 0.1% to 15%. More particularly, the ratio may be in the range of 0.1% to 10%. Such a vector is described in International patent WO 99/01216, thecontents of which are incorporated herein by reference.
Another suitable support that can be used is based on ceria and zirconia; these oxides may be present as mixed oxides or as a solid solution of zirconia in ceria or a solid solution of ceria in zirconia. These supports can be obtained by a first process comprising the steps of forming therein a mixture containing zirconium oxide and cerium oxide and washing or impregnating this mixture with an alkoxylation compound containing more than two carbon atoms. The impregnated mixture is then calcined.
The alkoxylated compounds may be selected from compounds having the formula (2) R1-((CH2)x-O)n-R2Wherein R is1And R2Represents linear or non-linear alkyl or H or OH or Cl or Br or I; n is a number in the range of 1 to 100; x is a number in the range of 1 to 4; or has the formula (3) (R)3，R4)-v((CH2)x-O)n-OH, wherein v represents a benzene ring, R3And R4Are identical or different substituents on the phenyl ring and represent hydrogen or a linear or non-linear alkyl radical having 1 to 20 carbon atoms, x and n being as defined above; or has the formula (4) R4O-((CH2)x-O)nProducts of-H, whichIn, R4Represents a linear or non-linear alcohol containing from 1 to 20 carbon atoms, x and n being as defined above; and has the formula (5) R5-S-((CH2)x-O)nA product of formula (I) or (II) wherein R is5Represents an alkyl group having 1 to 20 carbon atoms, and x and n are as defined above. These products are described in international patent WO 98/16472, the contents of which are incorporated herein by reference.
These vectors can also be obtained by a second method comprising the steps of: reacting a cerium salt solution, a zirconium salt solution and an additive selected from anionic surfactants, non-ionic surfactants, polyethylene glycols, carboxylic acids and salts thereof, possibly in the presence of a base and/or an oxidizing agent.
More particularly, anionic surfactants that can be used are carboxylates, phosphates, sulfates and sulfonates. Preferred nonionic surfactants that can be used are ethoxylated alkylphenols and ethoxylated amines.
The zirconium salt and the cerium salt may be reacted in a pyrohydrolysis reaction by heating a solution containing the salts. The reaction can also be carried out by precipitation by introducing a base into the solution containing the salt.
These products are described in international patent WO 98/45212, the contents of which are incorporated herein by reference.
The composition of the invention may be prepared by a process comprising contacting the support with manganese and at least one other element a or with a precursor of manganese and at least one other element a and calcining the bulk thereof at a temperature sufficient to convert the precursor or said element to an oxide. Generally, the temperature is at least 500 ℃, more particularly at least 600 ℃.
One method that may be used to perform the above contacting is impregnation. Thus, a solution or slurry of the salt or compound of the element being phase-loaded is first formed.
The salt is selected from inorganic acid salts such as nitrate, sulfate and chloride.
Organic acid salts, particularly saturated aliphatic carboxylates or hydroxycarboxylic acid salts, may also be used. Examples which may be cited are formates, acetates, propionates, oxalates and citrates.
The support is then impregnated with the solution or slurry.
More particularly, dry impregnation is used. Dry impregnation consists in adding to the product to be impregnated a volume of aqueous solution of the said element equal to the pore volume of the solid to be impregnated.
It may be advantageous to deposit the elements of the active phase in two portions. It is therefore advantageous to deposit manganese in a first step and then to deposit element a in a second step.
After impregnation, the support is optionally dried and then calcined. It should be noted that supports which have not been calcined prior to impregnation may be used.
The active phase may also be deposited by spray drying a suspension based on salts or compounds of the elements of the active phase and the carrier. The resulting spray-dried product is then calcined.
The composition of the invention described above is in powder form, but optionally it may be formed into pellets, beads, cylinders or honeycombs of various sizes.
The invention also relates to a method for reducing nitrogen oxide emissions by treating a gas with the composition of the invention.
Gases which can be treated in the present invention are, for example, gases from gas turbines, power station furnaces or internal combustion engines. In the latter case, they may be diesel engines or lean burn engines.
The composition of the invention acts as NO when contacted with a gas having a high oxygen contentxA trapping agent. The term "high oxygen content gas" refers to a gas that contains an excess of oxygen relative to the amount required for stoichiometric combustion of the fuel, more precisely, an excess of oxygen relative to the stoichiometric value λ 1, i.e. a gas with a λ value greater than 1. The lambda value is related in a known manner to the air/fuel ratio, in particular for internal combustion engines. These gases may be gases with an oxygen content (expressed by volume) of at least 2% from, for example, a lean burn engine, such as gases with a high oxygen content, for example at least 5% or more than 5%, more particularly at least 10% oxygen content from a diesel engine, which may be in the range 5% -20%.
The invention may also be used for gases of the above type which may additionally contain water, for example in the range of 10%.
The composition of the invention can be used for treating exhaust gases from internal combustion engines using sulfur-containing fuels, i.e. fuels having a sulfur content of at least 50ppm, more particularly at least 200ppm (expressed as elemental sulfur). The term "sulfur" should be taken in its broadest sense, i.e., to refer to sulfur as well as sulfur-containing compounds present in the fuel.
The invention also relates to a catalytic system for treating the exhaust gases of internal combustion engines comprising a composition according to the invention. More precisely, the system comprises a washcoat (wash coat) having catalytic properties and based on these compositions, for example on supports of the monolithic metallic and ceramic type.
The invention also relates to the use of the above-mentioned composition for producing such a catalytic system.
Examples are now given.
In the examples, the compositions were prepared as follows.
Preparation of the composition:
the following materials were used: manganese nitrate Mn (NO)3)2·H2O, 99.5% potassium nitrate KNO3And 99.5% barium nitrate Ba (NO)3)2。
The support used was SB3 alumina from Condea.
The deposition is carried out in two steps.
The first step is as follows: deposition of a first active element
This step consists in depositing the active element Mn in a proportion of 10 atomic%, calculated as:
[Mn]/([Mn]+[Al2O3])＝0.10
the second step is that: deposition of a second active element
This step consists in depositing, by dry impregnation, a second active element X, which may be K (comparative composition) or Ba, in a proportion of 10 atomic%, calculated as follows:
[X]/([Mn]+[X]+[Al2O3])＝0.10
the method comprises impregnating the support in question with elements of the active phase dissolved in a solution having a volume equal to the pore volume of the support and a concentration such as to obtain the desired concentration.
In this case, the elements are impregnated into the support in sequence using the following protocol:
● dry impregnation of the first element;
● oven drying (110 ℃, 2 hours);
● calcining at 500 deg.C for 2 hours;
● dry impregnation of the second element;
● oven drying (110 ℃, 2 hours);
● was calcined at 850 deg.C for 2 hours.
The resulting composition:
| composition comprising a metal oxide and a metal oxide | Active phase | BET surface area (after calcination at 850 ℃ C. for 2 hours) |
| 1 (comparison) | 10％Mn，10％K | 148m2/g |
| 2 | 10％Mn，10％Ba | 112m2/g |
Example 1
This example illustrates the aging resistance of the composition of the present invention.
In this example, the catalytic test was carried out as follows:
0.15g of each of the above-mentioned NOxCollector composition in powder formThe form was packed into a quartz reactor. The powders used have been compacted and then ground and sieved, separating a sieve with a particle size of 0.125 to 0.250 mm.
The reaction mixture at the reactor inlet had the following composition (expressed in volume):
●NO：300vpm
●O2：10％
●CO2：10％
●H2O：10％
●N2：qsp 100％
the total flow rate was 30 normal liters/hour.
HSV is 150000 hours-1An order of magnitude.
Continuous recording of NO and NO with temperature in the reactorxSignal (a) )。
By measuring adsorbed NO until saturation of the trapping phasexTotal amount of (NSC) (expressed in milligrams of NO per gram of trapping agent or active phase), estimate NOxA trapping agent. The experiment was carried out at 250 ℃.
Further, the composition was subjected to hydrothermal redox aging using the following procedure.
In N2Next, the temperature of the composition was increased to 950 ℃ within 60 minutes. The composition was then incubated at this temperature for 6 hours, with 24 cycles of 15 minutes each under an atmosphere of oxygen and water in nitrogen and 15 minutes each under an atmosphere of hydrogen and water in nitrogen. At the end of the treatment, at H2/N2The medium temperature is reduced to 80 ℃ and then N2In (1).
The results are shown in the table below.
| Composition comprising a metal oxide and a metal oxide | NSC, non-aged products | NSC, aged products | Difference (D) |
| 1 (comparison) | 9.2 | 2.9 | -68％ |
| 2 | 7.0 | 3.6 | -45％ |
It can be seen that the compositions of the present invention have improved aging resistance.
Example 2
This example illustrates the sulfur resistance of the composition of the present invention.
The same (unaged) composition as in example 1 was used. The reaction mixture at the reactor inlet had the same composition as in example 1 or the composition had an additional 30ppm of SO2。
The results are shown in the following table.
| Composition comprising a metal oxide and a metal oxide | NSC, no SO2 | NSC, with SO2 | Difference (D) |
| 1 (comparison) | 9.2 | 6.2 | -33％ |
| 2 | 7.0 | 5.4 | -22％ |
It can be seen that the compositions of the present invention have improved SO resistance2And (4) performance.
Claims (14)
1. One kind of NOxComposition of trapping agents, comprising a carrier and an active phase, characterized in that said active phase is a mixture of manganese andat least one other element A selected from alkaline earths and rare earths, and having or capable of having at least 10m after calcination at 800 ℃ for 8 hours2A/g, more particularly at least 20m2Specific surface area in g.
2. A composition according to claim 1, characterized in that the composition has or is capable of having at least 80m after calcination at 800 ℃ for 8 hours2A/g, more particularly at least 100m2Specific surface area in g.
3. A composition according to claim 1 or 2, characterized in that said element a is barium.
4. A composition according to any one of the preceding claims, characterized in that the support is based on alumina or alumina stabilized with silicon, zirconium, barium or rare earths.
5. A composition according to any one of claims 1 to 3, characterized in that the support is silica-based.
6. A composition according to any one of claims 1-3, characterized in that the support is based on silica and titanium oxide, wherein the atomic ratio Ti/Ti + Si is in the range 0.1% to 15%.
7. A composition according to any one of claims 1 to 3, characterized in that the support is based on cerium oxide and zirconium oxide, the support being obtained by a process comprising forming a mixture comprising zirconium oxide and cerium oxide and washing or impregnating the mixture with an alkoxylated compound containing more than 2 carbon atoms.
8. A composition according to any one of claims 1 to 3, characterized in that the support is based on cerium oxide and zirconium oxide, said support being obtained by a process comprising reacting a cerium salt solution, a zirconium salt solution and an additive selected from anionic surfactants, nonionic surfactants, polyethylene glycols, carboxylic acids and salts thereof, said reaction optionally being carried out in the presence of a base and/or an oxidizing agent.
9. A method for treating gases for the reduction of nitrogen oxide emissions, characterized in that a composition according to any one of claims 1 to 8 is used.
10. A method according to claim 9, characterized in that the exhaust gases from the combustion engine are treated.
11. A method according to claim 10, characterized in that the gas is treated in excess of oxygen with respect to the stoichiometric value.
12. A method according to claim 10 or 11, characterized in that the oxygen content of the gas is at least 2 vol%.
13. A catalytic system for treating the exhaust gases of an internal combustion engine, characterized in that it comprises a composition according to any one of claims 1 to 8.
14. Use of a composition according to any one of claims 1 to 8 in the manufacture of a catalytic system for treating the exhaust gases of an internal combustion engine.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR99/05187 | 1999-04-23 | ||
| FR9905187A FR2792547B1 (en) | 1999-04-23 | 1999-04-23 | COMPOSITION FOR USE AS A NOx TRAP, BASED ON MANGANESE AND AN ALKALINE EARTH OR RARE EARTH, AND USE IN THE TREATMENT OF EXHAUST GASES |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1351518A true CN1351518A (en) | 2002-05-29 |
| CN1132681C CN1132681C (en) | 2003-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN008079072A Expired - Fee Related CN1132681C (en) | 1999-04-23 | 2000-04-18 | Composition usable as NOx trap, based on manganese and an alkaline-earth or a rare earth and use in the treatment of exhaust gases |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP1181094A1 (en) |
| JP (1) | JP2002542029A (en) |
| KR (1) | KR100420909B1 (en) |
| CN (1) | CN1132681C (en) |
| BR (1) | BR0009995A (en) |
| CA (1) | CA2371276A1 (en) |
| FR (1) | FR2792547B1 (en) |
| NO (1) | NO20015161L (en) |
| WO (1) | WO2000064580A1 (en) |
| ZA (1) | ZA200108713B (en) |
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| CN107405570A (en) * | 2015-03-09 | 2017-11-28 | 萨索尔德国有限公司 | For BaAl2O4Form the NO with improved stabilityxCapture catalyst carrier material |
| CN110022973A (en) * | 2017-01-20 | 2019-07-16 | 萨索尔德国有限公司 | Alumina composition, Its Preparation Method And Use comprising Mn oxide |
| CN110141901A (en) * | 2019-05-15 | 2019-08-20 | 安吉润风空气净化科技有限公司 | A kind of filter screen with antioxygenic property |
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| GB0022786D0 (en) | 2000-09-16 | 2000-11-01 | Johnson Matthey Plc | NOx-Trap composition |
| US6727202B2 (en) | 2001-08-21 | 2004-04-27 | Engelhard Corporation | Enhanced NOx trap having increased durability |
| US6756338B2 (en) | 2001-09-19 | 2004-06-29 | Johnson Matthey Public Limited Company | Lean NOx trap/conversion catalyst |
| FR2841438A1 (en) * | 2002-06-26 | 2004-01-02 | Rhodia Elect & Catalysis | CIGARETTE COMPRISING A CATALYST FOR THE TREATMENT OF SMOKE |
| US8701681B2 (en) * | 2003-10-27 | 2014-04-22 | Philip Morris Usa Inc. | Use of oxyhydroxide compounds in cigarette paper for reducing carbon monoxide in the mainstream smoke of a cigarette |
| CN113574253B (en) * | 2019-03-20 | 2024-07-23 | 巴斯夫公司 | Adjustable NOx adsorber |
| US11614013B2 (en) * | 2020-02-21 | 2023-03-28 | Johnson Matthey Public Limited Company | Twc catalysts for gasoline engine exhaust gas treatments |
| CN115672367B (en) * | 2022-10-31 | 2024-05-31 | 触媒净化技术(南京)有限公司 | Glass fiber corrugated plate type blast furnace gas carbonyl sulfide hydrolysis catalyst and preparation method thereof |
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| US4876398A (en) * | 1988-06-10 | 1989-10-24 | China Petrochemical Development Corporation | Preparation of ortho-alkylated phenols in the presence of a catalyst prepared by co-precipitation process |
| GB2256375B (en) * | 1991-05-31 | 1995-06-07 | Riken Kk | Exhaust gas cleaner and method of cleaning exhaust gas |
| FR2738756B1 (en) * | 1995-09-20 | 1998-12-11 | Rhone Poulenc Chimie | PROCESS FOR THE TREATMENT OF HIGH OXYGEN CONTENT FOR REDUCING NITROGEN OXIDE EMISSIONS USING A CATALYTIC COMPOSITION COMPRISING MANGANESE OXIDE AND CERIUM AND / OR ZIRCONIUM OXIDE |
| JP3377676B2 (en) * | 1996-04-05 | 2003-02-17 | ダイハツ工業株式会社 | Exhaust gas purification catalyst |
| FR2791907B1 (en) * | 1999-04-12 | 2002-06-21 | Rhodia Chimie Sa | COMPOSITIONS FOR USE AS A NOx TRAP, BASED ON MANGANESE AND AN ALKALINE OR AN ALKALINE EARTH AND USE IN THE TREATMENT OF EXHAUST GASES |
-
1999
- 1999-04-23 FR FR9905187A patent/FR2792547B1/en not_active Expired - Fee Related
-
2000
- 2000-04-18 JP JP2000613564A patent/JP2002542029A/en active Pending
- 2000-04-18 CN CN008079072A patent/CN1132681C/en not_active Expired - Fee Related
- 2000-04-18 EP EP00920832A patent/EP1181094A1/en not_active Withdrawn
- 2000-04-18 CA CA002371276A patent/CA2371276A1/en not_active Abandoned
- 2000-04-18 BR BR0009995-3A patent/BR0009995A/en not_active IP Right Cessation
- 2000-04-18 WO PCT/FR2000/001008 patent/WO2000064580A1/en active Search and Examination
- 2000-04-18 KR KR10-2001-7013538A patent/KR100420909B1/en not_active IP Right Cessation
-
2001
- 2001-10-22 NO NO20015161A patent/NO20015161L/en not_active Application Discontinuation
- 2001-10-23 ZA ZA200108713A patent/ZA200108713B/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107405570A (en) * | 2015-03-09 | 2017-11-28 | 萨索尔德国有限公司 | For BaAl2O4Form the NO with improved stabilityxCapture catalyst carrier material |
| CN107405570B (en) * | 2015-03-09 | 2021-05-11 | 萨索尔德国有限公司 | For BaAl2O4Formation of NO with improved stabilityxTrapping catalyst support materials |
| CN110022973A (en) * | 2017-01-20 | 2019-07-16 | 萨索尔德国有限公司 | Alumina composition, Its Preparation Method And Use comprising Mn oxide |
| CN110141901A (en) * | 2019-05-15 | 2019-08-20 | 安吉润风空气净化科技有限公司 | A kind of filter screen with antioxygenic property |
| CN110141901B (en) * | 2019-05-15 | 2021-06-01 | 安吉润风空气净化科技有限公司 | Filter screen with oxidation resistance |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20020007386A (en) | 2002-01-26 |
| FR2792547B1 (en) | 2001-07-06 |
| KR100420909B1 (en) | 2004-03-02 |
| WO2000064580A1 (en) | 2000-11-02 |
| CN1132681C (en) | 2003-12-31 |
| JP2002542029A (en) | 2002-12-10 |
| ZA200108713B (en) | 2002-08-22 |
| NO20015161L (en) | 2001-12-20 |
| EP1181094A1 (en) | 2002-02-27 |
| BR0009995A (en) | 2002-03-26 |
| NO20015161D0 (en) | 2001-10-22 |
| CA2371276A1 (en) | 2000-11-02 |
| FR2792547A1 (en) | 2000-10-27 |
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