CN1631531A - Purifying catalyst for nitrogen oxides in sulfur containing oxygen enriching tail gas - Google Patents

Purifying catalyst for nitrogen oxides in sulfur containing oxygen enriching tail gas Download PDF

Info

Publication number
CN1631531A
CN1631531A CN 200310121879 CN200310121879A CN1631531A CN 1631531 A CN1631531 A CN 1631531A CN 200310121879 CN200310121879 CN 200310121879 CN 200310121879 A CN200310121879 A CN 200310121879A CN 1631531 A CN1631531 A CN 1631531A
Authority
CN
China
Prior art keywords
catalyst
metal
carrier
noble metal
aforementioned
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.)
Granted
Application number
CN 200310121879
Other languages
Chinese (zh)
Other versions
CN100560204C (en
Inventor
贺泓
王进
解淑霞
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.)
Research Center for Eco Environmental Sciences of CAS
Original Assignee
Research Center for Eco Environmental Sciences of CAS
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 Research Center for Eco Environmental Sciences of CAS filed Critical Research Center for Eco Environmental Sciences of CAS
Priority to CNB2003101218797A priority Critical patent/CN100560204C/en
Publication of CN1631531A publication Critical patent/CN1631531A/en
Application granted granted Critical
Publication of CN100560204C publication Critical patent/CN100560204C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

The invention offers a kind of catalyst to catalyst and restores nitrogen oxide in the condition of full of oxygen. In the condition that Wei air has SO2, it can remove nitrogen oxide choosing and organic matters and oxide carbon. The source of the air is diesel motor, gasoline motor and natural gas motor or the fixed fire motor. The catalyst is made of silver parts, dear metal parts, and other metal parts and carries improvement dose or inorganic carry. Its feature is that the dear metal can be one of those to be talked about, the metal parts can be more than one of those to be talked about, and carry improvement dose can be also one of these to be talked about. Dear metal: Au, Pt, Pa, Lao, Yi, Lo. Other metal: Fe, Cu, Ti, Go, Be, Sn, Wu, Zn, Mo, Fei, Se, La. carry improvement dose: aluminum gum dissolved, silicon gum dissolved.

Description

Catalyst for purification of nitrogen oxides in the sulfur-bearing oxygen enrichment tail gas
Technical field
The present invention is used for the nitrogen oxide of purification of exhaust gases of internal combustion engines, particularly under excess oxygen, utilizes limited carbon monoxide and organic matter selective reducing nitrogen oxide, and catalyst contains the SO of higher concentration under lower reaction temperature and in the tail gas 2Condition under, higher nitrogen oxide reducing activity is also arranged.
Technical background
This catalyst is different with the three-way catalyst that generally is used at present to purify gasoline engine tail gas.The use of three-way catalyst is to be based upon the ratio of strict control petrol engine air and fuel near theoretical air-fuel ratio (14.1 ± 0.1), and remaining oxygen content is seldom in the tail gas at this moment.Its mechanism of action is to make carbon monoxide and organic matter as reducing agent nitrogen oxides reduction (NO by catalyst x) become nitrogen, and the remaining carbon monoxide of catalytic oxidation becomes carbon dioxide and water with organic matter.Nearly all new product gasoline car (not containing lean-burn gasoline motor car) all is equipped with three-way catalyst at present, and what form sharp contrast therewith is that diesel vehicle is not taked similar control techniques basically.The diesel engine actual mixing ratio is much larger than its chemically correct fuel, belong to lean combustion engine, in the tail gas carbon monoxide and organic content seldom, but oxygen content is tens times of gasoline engine, can reach 15% volume ratio, clearly three-way catalyst is not suitable for the operating mode of diesel engine.
Up to the present, for the Rarefied combustion tail gas catalysis and purification technology of nitrogen oxide in diesel engine and the gasoline engine tail gas particularly, the catalyst of studying can be divided into zeolite, load type metal or metal oxide and the carried noble metal three major types of ion-exchange, and reducing agent mainly contains Ammonia, low-carbon alkene, alkane, alcohol, ketone and ether etc.At present, the subject matter that catalyst in the research exists is, zeolite catalyst is to steam and sulfur dioxide poisoning, and hydrothermal stability is poor; The noble metal catalyst poor selectivity, and the active temperature scope is narrow, and most of reducing agent loses the ability of nitrogen oxides reduction at the high-temperature region oxidizing fire; Load type metal or metal oxide catalyst low temperature active when making reducing agent with organic matters such as low-carbon alkene, alkane is still waiting to improve.For example, we had applied for the patent (application number: 02157917.2) of the silver catalyst that the interpolation noble metal improves in the past, this catalyst has good low temperature active, and with third rare be in the scope of 300-550 ℃ of simulated exhaust gas temperature of reducing agent, average transformation efficiency of the oxides of nitrogen is 67.8%, but, in the middle of tail gas, have certain density SO 2In the time of (80ppm), the low temperature removal of nitrogen oxide activity of this catalyst is relatively poor.
Summary of the invention
The present invention is directed to the problems referred to above, the silver catalyst that noble metal improves further improved, provide a kind of be used under the excess oxygen combustion tail gas particularly diesel engine vent gas contain certain density SO 2Condition under the catalyst of catalytic cleaning nitrogen oxide, the silver catalyst that improves with respect to noble metal has good cryogenic nitrogen oxide reducing activity.
The effect of invention
The present invention is fully taking into account on the basis of previous studies, has carried out the result of a large amount of thoroughgoing and painstaking researchs.The catalyst that is provided is oxygen content (for example 10% volume) oxygen content when burning far above stoichiometric proportion in tail gas, the steam of 10% volume and 80ppm SO 2Still nitrogen oxide had very high reducing activity under the condition, particularly catalyst (the application number: 02157917.2) be greatly improved before improving than the activity under the low exhaust gas temperature.
Catalyst of the present invention can be loaded on the same porous inorganic thing carrier simultaneously or with any sequencing by other metal components of the noble metal component of the silver components of 0.1-10% (metallic element weight scaled value), 0.01-1.5% (metallic element weight scaled value), 1.0-25% (metallic element weight scaled value) and 0.5-15% (alundum (Al or silica scaled value) carrier improver and constitute, and also can load on respectively on the different porous inorganic thing carriers to constitute catalyst by mixing.Aforementioned noble metal component is at least a in noble metal group gold, platinum, palladium, rhodium, iridium, the ruthenium, and aforementioned other metal components can be at least a in metal group iron, copper, titanium, zirconium, barium, tin, tungsten, zinc, molybdenum, cerium, caesium, lanthanum, the calcium.
Aforesaid catalyst, when silver components during less than 0.1% (metallic element weight scaled value), the conversion ratio of activity of such catalysts nitrogen oxide can be very low, and silver components can reduce the pyrolytic conversion rate of nitrogen oxide during greater than 10% (metallic element weight scaled value).The silver components of indication can be the oxide of silver and silver and the form of any inorganic salts and do not change its effect, it is characterized in that silver components has the particle diameter of average 5-1000 nanometer on porous inorganic thing carrier, is preferably average 10-300 nanometer.Aforesaid catalyst, when noble metal component during less than 0.01% (metallic element weight scaled value), the activity of such catalysts particularly conversion ratio of cryogenic nitrogen oxide can reduce.And noble metal component is during greater than 1.5% (metallic element weight scaled value), can preferential combustion and reduce the pyrolytic conversion rate of nitrogen oxide as the organic matter of reducing agent.Aforementioned noble metal component can be the form of the oxide of this noble metal and this noble metal and any inorganic salts and do not change its effect.It is characterized in that silver components has the particle diameter of average 5-300 nanometer on porous inorganic thing carrier, be preferably average 10-50 nanometer.Other metal components of aforementioned 1.0-25% (metallic element weight scaled value) can be the forms of the oxide of this metal and this metal and any inorganic salts and do not change its effect, it act as the co-catalyst or second carrier, looks application and condition and adjusts.The porous inorganic thing carrier of catalyst can be alundum (Al, zeolite, sepiolite, titanium dioxide, zinc oxide, magnesia, tin ash one or more hopcalites or its composite oxides, porous carbon material wherein.Aforesaid porous inorganic thing carrier should have 10 meters squared per gram or bigger specific area, is preferably 30 meters squared per gram or bigger specific area.
According to the present invention, component, noble metal component and other metal oxides of silver can be by usefulness soluble compound water solution separately with well-known infusion process, and the precipitation method or sol-gel process are deposited on the aforesaid porous inorganic thing carrier.During such as the use infusion process, can be in silver, noble metal and other metal oxides soluble compounds aqueous solution separately with selected porous inorganic thing carrier impregnation, stirred 2-15 hour, 110-150 ℃ of drying, interim ground is warming up to 700 ℃ from 100 ℃ in air or nitrogen or hydrogen or vacuum.The granular size of component, noble metal component and other metal oxides of silver can be controlled by adjusting factors such as temperature, time and atmosphere.According to the present invention, also can one or both metal components be carried on the porous inorganic thing carrier by preceding method any order, press with other metal components of quadrat method load then.According to the present invention, component, noble metal component and other metal components of silver also can load on respectively on the different porous inorganic thing carriers and constitute catalyst by mixing.
Aforesaid catalyst, preferably be coated on the wall surface of circulation passage of pottery or metal honeycomb with the form of coating, this integrated catalyst has the passage of the parallel circulation of many tail gas, and vapour lock is very little, can be applicable to handle diesel engine vent gas or gasoline engine tail gas.The hole density of preferred honeycomb is the 100-400/ square inch.Catalyst is coated on these carrier structures with the concentration of 30-300 gram/every liter of carrier structure.According to different needs, other structures also can be as the structural carrier of catalyst as metallic sieve or open-celled foams.Also catalyst can be made spherical or tabular use.
Be suitable for the tail gas source and comprise Diesel engine, fixing or motor-driven burner such as lean-burn gasoline engine and natural gas engine.It is characterized in that, when the content of oxygen in tail gas catalyst when equivalent burns still effective, but when imperfect combustion hydrocarbon and carbon monoxide content are not enough to be used for nitrogen oxides reduction under the above-mentioned lean burn situation, need to add hydrocarbon/or oxygen-bearing organic matter/or the mixture of hydrocarbon and oxygen-bearing organic matter as reducing agent with nitrogen oxides reduction.
Oxygen content is higher than that the purification of nitrogen oxides method is in the combustion tail gas of stoichiometric proportion when burning oxygen content, aforesaid catalyst can be placed aforesaid exhaust pipe way, add in the upstream of catalyst hydrocarbon/or oxygen-bearing organic matter/or the mixture and the tail gas of hydrocarbon and oxygen-bearing organic matter mix, gaseous mixture is contacted with catalyst at 150-600 ℃, thus make nitrogen oxide and hydrocarbon/or oxygen-bearing organic matter/or the mixture reaction of hydrocarbon and oxygen-bearing organic matter be reduced into nitrogen.Preferred exhaust temperature scope is 250-550 ℃.Unnecessary reducing agent is oxidized to carbon dioxide and water under the effect of catalyst.The method of the interpolation of above-mentioned reducing agent (gaseous state or liquid state) can be carried out with the form of spraying the upstream of catalyst in exhaust pipe.Also above-mentioned reducing agent (gaseous state or liquid state) can be injected in the combustion chambers of internal combustion engines, utilize the remaining component of burning to make reducing agent and contact nitrogen oxide in the reduction tail gas with catalyst.The air/fuel ratio that can also adjust internal combustion engine makes and contains more unburned hydrocarbons and oxygen-bearing organic matter in the tail gas, contacts nitrogen oxide in the reduction tail gas with catalyst.Relatively above several method can obtain most economical and effective Rarefied combustion tail gas nitrogen oxide purification method.
In order to be illustrated more clearly in the present invention, enumerate following examples, but it there is not any restriction to scope of the present invention.
Embodiment 1 Preparation of catalysts
(particle diameter is less than 120 orders for 100 gram γ-alundum (Al powder, specific area: be not less than 250 meters squared per gram) impregnated in certain density silver nitrate, palladium nitrate, ferric nitrate and the silica aqueous solution, stirred 1 hour, after 110 ℃ of dryings, in air, interimly be warming up to 700 ℃ from 100 ℃, kept 3 hours, reduce to room temperature, it is standby to get the 0.5-1.0mm particle after the pulverizing, for implementing catalyst A.The silver components load capacity of manufactured goods catalyst is 5.0% (metallic element weight scaled value), palladium component load capacity is 0.5% (metallic element weight scaled value), and iron component load capacity is that 15.0% (metallic element weight scaled value), silicon components load capacity are 10% (SiO 2The weight scaled value).
Comparative example 1
(particle diameter is less than 120 orders for 100 gram γ-alundum (Al powder, specific area: be not less than 250 meters squared per gram) be soaked in decide the silver nitrate of concentration, in the mixed aqueous solution of palladium nitrate, ferric nitrate, stirred 1 hour, after 90 ℃ of dryings, interim ground is warming up to 700 ℃ from 100 ℃ in air, kept 3 hours, reduce to room temperature, it is standby to get the 0.5-1.0mm particle after the pulverizing, is comparative catalyst A.The silver components load capacity of manufactured goods catalyst is 5.0% (metallic element weight scaled value), and palladium component load capacity is 0.5% (metallic element weight scaled value), and iron component load capacity is 15.0% (metallic element weight scaled value).
Embodiment 2 excess oxygen propylene selective reduction NO
Enforcement catalyst A and comparative catalyst A that 1.5 grams are made by above method for making are positioned over respectively in the tubular reactor, feed 4 liters/per minute of simulation Rarefied combustion tail gas as shown in table 1, and corresponding air speed (GHSV) is 50,000/ hours.The temperature that enters the simulated exhaust gas of reactor begins to warm to 600 ℃ from 200 ℃, observe catalytic reaction when reaching stable state nitrogen oxide by the situation of third rare reduction.
By the nitrous oxides concentration in the simulated exhaust gas behind the catalyst (nitric oxide and nitrogen dioxide sum), see Table 1, utilize chemiluminescence formula nitrogen oxide (nitric oxide, nitrogen dioxide and total nitrogen oxide) analysis-e/or determining.Experimental result sees Table 2.
Table 1
Constituent concentration
Nitric oxide 700ppm
Carbon monoxide 90ppm
Sulfur dioxide 80ppm
Oxygen 10% volume ratio
Third rare 1500ppm
Nitrogen balance
Water 10% volume ratio
Air speed (GHSV) 50,000/ hours
Table 2
The simulated exhaust gas temperature (℃) 250 300 350 400 450 500 550 600
Comparative catalyst A
Transformation efficiency of the oxides of nitrogen (%) 6.4 7.0 11.2 13.1 22.4 37.3 60.5 28.6
Implement catalyst A
Transformation efficiency of the oxides of nitrogen (%) 35.3 35.6 42.6 62.6 65.4 55.0 60.3 37.2
As can be seen from Table 2, use aforesaid enforcement catalyst A can in wider temperature range, remove nitrogen oxide well, amazingly especially be, in low temperature 250-450 ℃ scope, average transformation efficiency of the oxides of nitrogen is 42%, is 3.5 times of average transformation efficiency of the oxides of nitrogen 12% of comparative catalyst A in the same temperature range.Generally the temperature than the stoichiometric proportion combustion tail gas is low to consider the temperature of Rarefied combustion tail gas, and this is a particularly advantageous factor.
As mentioned above, use catalyst provided by the invention, can be in very wide temperature range, the nitrogen oxide in the higher Rarefied combustion tail gas of sulfur content is effectively purified.Catalyst provided by the invention can be widely used in Diesel engine, the motor vehicles such as lean-burn gasoline engine and natural gas engine or the fixing tail gas clean-up of lean burn device.

Claims (7)

1. one kind is used for the catalyst of purification of combustion tail gas, it is characterized in that, under excess oxygen, contains higher SO in the tail gas 2The environment of concentration under, can optionally utilize simultaneously organic matter and carbon monoxide reduction to remove in the tail gas nitrogen oxide and oxidation and remove imperfect combustion organic matter and carbon monoxide, this catalyst is made of the silver components, noble metal component, other metal components and the carrier improver component that load on the porous inorganic thing carrier.
2. the described catalyst of claim 1 as described above, it is characterized in that, aforementioned noble metal component can be at least a among the following noble metal group, and aforementioned other metal components can be at least a in following other metal groups, and the carrier improver can be at least a in the following carrier improver.
Noble metal group: gold, platinum, palladium, rhodium, iridium, ruthenium
Other metal groups: iron, copper, titanium, zirconium, barium, tin, tungsten, zinc, molybdenum, cerium, caesium, lanthanum, calcium
Carrier improver: aluminium colloidal sol, Ludox
3. the described catalyst of claim 1 as described above, it is characterized in that, aforementioned silver components, noble metal component, other metal components and carrier improver, they can be simultaneously or load on the same porous inorganic thing carrier with any sequencing and to constitute catalyst, also can load on respectively on the different porous inorganic thing carriers to constitute catalyst by mixing.
4. the described catalyst of claim 1 as described above, it is characterized in that, the load capacity of the silver components on the aforementioned porous inorganic thing carrier is 0.1-10% (a metallic element weight scaled value), the load capacity of noble metal component is 0.01-1.5% (a metallic element weight scaled value), and other metal component load capacity are 1.0-25% (metallic element weight scaled value).Carrier improver load capacity is 0.5-15% (alundum (Al or a silica scaled value).
5. the described catalyst of claim 1 as described above is characterized in that, aforementioned silver components can be the form of the oxide of silver and silver and any inorganic salts and do not change its effect.Aforementioned noble metal component can be the form of the oxide of this noble metal and this noble metal and any inorganic salts and do not change its effect.Aforementioned other metal components can be the forms of the oxide of this metal and this metal and any inorganic salts and do not change its effect.
6. the described catalyst of claim 1 as described above, it is characterized in that aforementioned porous inorganic thing carrier can be alundum (Al, silica, zeolite, sepiolite, titanium dioxide, zirconium dioxide, zinc oxide, magnesia, tin ash one or more hopcalites or its composite oxides, porous carbon material wherein.Aforesaid porous inorganic thing carrier should have 10 meters squared per gram or bigger specific area.Aforesaid porous inorganic oxide carrier can be Powdered also can be the coccoid of moulding.
7. the described catalyst of claim 1 as described above is characterized in that, according to different requirements catalyst is coated in the form of coating on the wall surface of circulation passage of pottery or metal honeycomb, or catalyst is made spherical or tabular.
CNB2003101218797A 2003-12-24 2003-12-24 Catalyst for purification of nitrogen oxides in the sulfur-bearing oxygen enrichment tail gas Expired - Fee Related CN100560204C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2003101218797A CN100560204C (en) 2003-12-24 2003-12-24 Catalyst for purification of nitrogen oxides in the sulfur-bearing oxygen enrichment tail gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2003101218797A CN100560204C (en) 2003-12-24 2003-12-24 Catalyst for purification of nitrogen oxides in the sulfur-bearing oxygen enrichment tail gas

Publications (2)

Publication Number Publication Date
CN1631531A true CN1631531A (en) 2005-06-29
CN100560204C CN100560204C (en) 2009-11-18

Family

ID=34844319

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2003101218797A Expired - Fee Related CN100560204C (en) 2003-12-24 2003-12-24 Catalyst for purification of nitrogen oxides in the sulfur-bearing oxygen enrichment tail gas

Country Status (1)

Country Link
CN (1) CN100560204C (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102380377A (en) * 2011-09-07 2012-03-21 中国第一汽车股份有限公司 Metal-foam structure unit for POC (particle oxidation catalyst) postprocessor
CN102600840A (en) * 2007-08-09 2012-07-25 宜安德株式会社 Catalyst for removing carbon monoxide, hydrocarbons and particulate matters in engine
CN102962061A (en) * 2012-11-09 2013-03-13 陕西超能石化科技有限公司 Multifunctional catalyst for removing NOX and SOX in catalytic cracking regeneration flue gas and preparation method of multifunctional catalyst
CN103648617A (en) * 2012-03-28 2014-03-19 现代重工业株式会社 Metal filter for purifying exhaust gas from ship, and preparation method thereof
CN103908965A (en) * 2014-03-14 2014-07-09 中国石油集团工程设计有限责任公司 A low-temperature oxidation catalyst used for processing sulfur-containing tail gas and a preparation method thereof
CN105536823A (en) * 2014-10-28 2016-05-04 中国石油化工股份有限公司 Sulfur-resistant catalytic combustion catalyst and preparation method thereof
CN106977959A (en) * 2017-03-28 2017-07-25 常州大学 A kind of preparation method of cleaning of off-gas type modified pitch
CN110013829A (en) * 2019-01-21 2019-07-16 北京工业大学 Order mesoporous CMK-3 load Ba/Rh or K/Mo adsorbent of a kind of cryogenic absorption NOx and preparation method thereof
CN113457660A (en) * 2021-06-30 2021-10-01 无锡威孚环保催化剂有限公司 Catalyst for gasoline vehicle particle catcher and preparation method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA963235B (en) * 1995-06-15 1996-10-25 Engelhard Corp Diesel exhaust stream treating catalyst and method of use
US6093378A (en) * 1997-05-07 2000-07-25 Engelhard Corporation Four-way diesel exhaust catalyst and method of use
ES2250035T3 (en) * 2000-03-01 2006-04-16 UMICORE AG & CO. KG CATALYST FOR PURIFICATION OF DIESEL ENGINE EXHAUST GASES AND PROCESS FOR PREPARATION.
CN1209191C (en) * 2002-02-20 2005-07-06 中国科学院生态环境研究中心 Rarefied combustion tail gas nitrogen oxide purification catalyst and its purification

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102600840A (en) * 2007-08-09 2012-07-25 宜安德株式会社 Catalyst for removing carbon monoxide, hydrocarbons and particulate matters in engine
CN102380377A (en) * 2011-09-07 2012-03-21 中国第一汽车股份有限公司 Metal-foam structure unit for POC (particle oxidation catalyst) postprocessor
CN103648617B (en) * 2012-03-28 2016-05-04 现代重工业株式会社 For purifying metallic filter and the manufacture method thereof of marine exhaust
CN103648617A (en) * 2012-03-28 2014-03-19 现代重工业株式会社 Metal filter for purifying exhaust gas from ship, and preparation method thereof
CN102962061A (en) * 2012-11-09 2013-03-13 陕西超能石化科技有限公司 Multifunctional catalyst for removing NOX and SOX in catalytic cracking regeneration flue gas and preparation method of multifunctional catalyst
CN103908965A (en) * 2014-03-14 2014-07-09 中国石油集团工程设计有限责任公司 A low-temperature oxidation catalyst used for processing sulfur-containing tail gas and a preparation method thereof
CN103908965B (en) * 2014-03-14 2015-11-18 中国石油集团工程设计有限责任公司 A kind of low-temperature oxidation catalyst for the treatment of sulfur-containing tail gas and preparation method thereof
CN105536823A (en) * 2014-10-28 2016-05-04 中国石油化工股份有限公司 Sulfur-resistant catalytic combustion catalyst and preparation method thereof
CN105536823B (en) * 2014-10-28 2017-09-29 中国石油化工股份有限公司 A kind of Sulfur-resistant catalytic-combustioncatalyst catalyst and preparation method thereof
CN106977959A (en) * 2017-03-28 2017-07-25 常州大学 A kind of preparation method of cleaning of off-gas type modified pitch
CN110013829A (en) * 2019-01-21 2019-07-16 北京工业大学 Order mesoporous CMK-3 load Ba/Rh or K/Mo adsorbent of a kind of cryogenic absorption NOx and preparation method thereof
CN110013829B (en) * 2019-01-21 2022-03-15 北京工业大学 Low-temperature NOx adsorption ordered mesoporous CMK-3 loaded Ba/Rh or K/Mo adsorbent and preparation method thereof
CN113457660A (en) * 2021-06-30 2021-10-01 无锡威孚环保催化剂有限公司 Catalyst for gasoline vehicle particle catcher and preparation method thereof
CN113457660B (en) * 2021-06-30 2023-04-28 无锡威孚环保催化剂有限公司 Catalyst for particle catcher of gasoline car and preparation method thereof

Also Published As

Publication number Publication date
CN100560204C (en) 2009-11-18

Similar Documents

Publication Publication Date Title
US6624113B2 (en) Alkali metal/alkaline earth lean NOx catalyst
US6455463B1 (en) Alkaline earth/transition metal lean NOx catalyst
US6677264B1 (en) Catalyst for cleaning up the exhaust gases of a diesel engine
EP0852966B1 (en) Exhaust gas purifying catalyst and exhaust gas purifying method
US6221804B1 (en) Catalyst for purifying exhaust gas and manufacturing method thereof
KR101841905B1 (en) Catalytic converter for removing nitrogen oxides from the exhaust gas of diesel engines
CN1209195C (en) Oxygen-enriched tail gas nitrogen oxide purifying catalyst
JP3311012B2 (en) Exhaust gas purification catalyst and exhaust gas purification method
Wang et al. Research advances of rare earth catalysts for catalytic purification of vehicle exhausts− Commemorating the 100th anniversary of the birth of Academician Guangxian Xu
JPH067923B2 (en) Three-way catalyst and method for producing the same
US20130336865A1 (en) NOx ABSORBER CATALYST
EP0781592B1 (en) Exhaust gas purification method by reduction of nitrogen oxides
JP4703818B2 (en) Exhaust gas purification catalyst and exhaust gas purification method
WO1998047605A1 (en) Exhaust gas purification method and exhaust gas purification catalyst
KR100904029B1 (en) Exhaust gas purifying catalyst
US6489259B2 (en) Mixed zeolite NOx catalyst
CN1631531A (en) Purifying catalyst for nitrogen oxides in sulfur containing oxygen enriching tail gas
CN1209191C (en) Rarefied combustion tail gas nitrogen oxide purification catalyst and its purification
US6670296B2 (en) Alumina/zeolite lean NOx catalyst
EP0722767A1 (en) Catalyst for purifying exhaust gases
JP3488487B2 (en) Exhaust gas purification method
JP2005224704A (en) Hydrocarbon adsorption and combustion catalyst, and its production process
JPH0663359A (en) Nitrogen oxides purifying method and waste gas treating device
JP6674858B2 (en) Exhaust gas purification catalyst and exhaust gas purification device using the same
JPH06190245A (en) Exhaust gas purifying catalyst structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
EE01 Entry into force of recordation of patent licensing contract

Assignee: Changzhou hi tech Environmental Protection Technology Co.,Ltd.

Assignor: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences

Contract record no.: 2010320000436

Denomination of invention: Purifying catalyst for nitrogen oxides in sulfur containing oxygen enriching tail gas

Granted publication date: 20091118

License type: Exclusive License

Open date: 20050629

Record date: 20100504

CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20091118

Termination date: 20211224