CN102974343A - Catalyst suitable for processing tail gas of lean-burn natural gas vehicle and preparation method thereof - Google Patents
Catalyst suitable for processing tail gas of lean-burn natural gas vehicle and preparation method thereof Download PDFInfo
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- CN102974343A CN102974343A CN2012104829895A CN201210482989A CN102974343A CN 102974343 A CN102974343 A CN 102974343A CN 2012104829895 A CN2012104829895 A CN 2012104829895A CN 201210482989 A CN201210482989 A CN 201210482989A CN 102974343 A CN102974343 A CN 102974343A
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Abstract
The invention discloses a catalyst suitable for processing the tail gas of a lean-burn natural gas vehicle and a preparation method thereof. The catalyst is prepared through the following steps of: loading rare earth metal on a carrier gamma-AL2O3, painting precious metal, and drying and calcining carrier gamma-AL2O3 coated with the precious metal, wherein the precious metal is Pt and/or Pd, and the rare earth metal is Zr, Y, La and/or Ce; the weight percentage of the precious metal is 2.0%, wherein the weight ratio of Pt to Pd is (1-0):(0-1); and the weight percentage of the rare earth metal Zr is 10%, the weight percentage of the rare earth metal Y is 0-10%, the weight percentage of the rare earth metal La is 0-10%, and the weight percentage of the rare earth metal Ce is 0-10%. The preparation method of the catalyst, which is disclosed by the invention, has the advantages of simplicity, easiness in controlling the preparation process conditions, and high practicability. Through the detection, the catalyst has favorable CH4 conversion performance, and has a favorable effect in processing the tail gas of lean-burn natural gas vehicles so as to enable the tail gas to meet various corresponding national standards and requirements.
Description
Technical field
The invention belongs to catalyst preparation technical field, especially belong to complete cleaning catalyst preparing technical field, relate to a kind of Catalysts and its preparation method that the lean burn natural gas tail gas is processed that is applicable to.
Background technology
Increasingly urgent along with the energy and environmental problem, for protection of the environment, energy savings, people propose higher requirement to the emission control of motor-vehicle tail-gas.China's natural gas is than horn of plenty, and a lot of city buses and taxi all use natural gas to act as a fuel, and add natural gas as a kind of development energy, also can be widely used in the fuel for motor vehicle in the future.Therefore, it is imperative to strengthen Research on Post-processing Techniques control natural gas vehicle exhaust emissions, seems particularly important as the core component catalyst in the post-processing technology.With respect to gasoline car, the development of natural gas vehicle catalyst technology is also immature.This is that people have carried out large quantity research to the vent gas treatment that this fuel combustion emits, and have accumulated experience because automobile primary will use gasoline to act as a fuel all the time; And natural gas acts as a fuel, and it is less that people process research to its emission.
Compare with gasoline car, still have HC, CO and NO in the lean burn natural gas tail gas
xThree kinds of pollutants.But the HC of gasoline car discharging is mainly the hydrocarbon of generate longer-chain hydrocarbons, and the HC of natural gas vehicle discharging mainly is methane CH
4Methane is molecule the most stable in the HC class, and the difficulty that purifies methane by chemical method will be far above other alkane.Directly quote the automobile catalyst purification techniques of present maturation and process methane, its transformation efficiency is not high, often can not arrive effect.
The people such as Zhao Bin have used La-Al
2O
3, La-Al
2O
3+ CeO
2-ZrO
2And La-Al
2O
3+ CeO
2-ZrO
2.MnO
xFor carrier material prepares the natural gas purification catalyst.The result shows La-Al
2O
3+ CeO
2-ZrO
2.MnO
xFor carrier material can effectively reduce CH
4Initiation temperature.[noble metal 2004,25(3), 33～35], illustrate that carrier material is very large on the catalyst performance impact.Do not affect carrier material structure and performance thereof but which kind of element this document furthers investigate, thereby affect catalyst performance.
Summary of the invention
The present invention discloses a kind of Catalysts and its preparation method that the lean burn natural gas tail gas is processed that is applicable to according to the deficiencies in the prior art.The problem to be solved in the present invention provides the preparation method that a kind of more effective processing natural gas and auto tail gas is processed catalyst; The Second Problem that the present invention solves be by said method a kind of excellent performance is provided, particularly to CH
4+ 2O
2→ 2H
2O+CO
2The catalyst that catalytic reaction efficient is very high.
The present invention is achieved through the following technical solutions:
Be applicable to the catalyst that the lean burn natural gas tail gas is processed, it is characterized in that: described catalyst is that noble metal and rare earth metal are loaded on carrier γ-Al
2O
3Make, wherein noble metal is that Pt and/or Pd, rare earth metal are Zr, Y, La and/or Ce, and the weight percent content of noble metal and rare earth metal is:
Noble metal 2.0%, wherein the part by weight of Pt and Pd is Pd: Pt=1～0: 0～1;
Rare earth metal Zr10%, rare earth metal y 0～10%, rare-earth metal La 0～10%, rare earth metal Ce0～10%.
The weight percent content of preferred noble metal and rare earth metal is:
Noble metal 2.0%, wherein the part by weight of Pt and Pd is Pd: Pt=5: 1;
Rare earth metal Zr10%, rare earth metal y 10%.
Be applicable to the method for preparing catalyst that the lean burn natural gas tail gas is processed, may further comprise the steps:
(1), form according to above-mentioned catalyst, take by weighing respectively corresponding rare-earth metal nitrate and γ-Al
2O
3Powder;
(2), with the rare-earth metal nitrate that (1) step takes by weighing, be dissolved in the deionized water, the addition of deionized water is γ-Al
2O
30.9～0.1 times of water absorption;
(3), the γ-Al that (1) step is taken by weighing
2O
3Add in the salting liquid of (2) step, stir rapidly, room temperature standing time 〉=1 hour, 8 hours, 600 ℃ calcinings of 80 ℃ of vacuum drying 3 hours obtain γ-Al that a kind of load has rare-earth oxide
2O
3Powder;
(4), form by above-mentioned catalyst and to take by weighing palladium nitrate and/or platinum nitrate, add suitable quantity of water, amount of water is γ-Al
2O
30.8～0.9 times of quality mixes;
(5), step (3) gained powder is added in the solution of step (4); Be stirred to rapidly evenly, standing time 〉=1 hour, 80 ℃ of vacuum drying 8 hours, 550 ℃ of calcinings 2 hours obtain a kind of powder that contains noble metal;
(6), mixture that powder and other of step (5) gained noble metal need to be added component adds bonding agent, is prepared into slurries, be coated on the catalyst converter carrier, 120 ℃ of dryings 2 hours, 550 ℃ of calcinings 2 hours make catalyst.
The present invention adopts commercial γ-Al
2O
3, prepared a kind of γ-Al that contains rare earth oxide
2O
3Catalysis material adopts infusion process to prepare the catalyst coat powder that contains noble metal on the basis of this material.Add bonding agent in this powder, be prepared into slurries, apply on the cordierite ceramic honeycomb carrier, be prepared into catalyst.
The present invention determines that at first as required preparation contains rare earth oxide γ-Al when the described catalyst of preparation
2O
3Total catalyst weight; Then according to gross weight, calculate each rare-earth oxide and γ-Al
2O
3Mass percent; Again with the mass percent of above-mentioned rare-earth oxide, according to the different metal salt that adopts, such as cerous nitrate [Ce (NO
3)
3.6H
2O], calculate in requisition for slaine weight take by weighing for subsequent use; γ-Al in preparation process (2)
2O
3Water absorption refers to commercial γ-Al
2O
3Just become the thick required water yield after adding water, purpose is to allow loading process keep Powdered, and adding water can not be excessive; The noble metal addition adds palladium nitrate, the platinum nitrate solution of metering according to design requirement in preparation process (6).
Method for preparing catalyst of the present invention is simple, and the preparation process condition is easy to control, and is practical.Catalyst has excellent CH after testing
4Conversion performance is used for the processing of lean burn natural gas tail gas and has satisfactory result, meets the corresponding all standard of country and requirement.Catalyst has excellent CH
4Conversion performance is used for the processing of lean burn natural gas tail gas and has optimal result, meets the corresponding all standard of country and requirement.Adopt nitrate dissolving dipping, the promoter rare earth oxide is impregnated into γ-Al
2O
3On, through 600 ℃ of roastings, rare-earth oxide modified is at γ-Al
2O
3On.Noble metal is impregnated into rare-earth oxide modified γ-Al
2O
3On, through 550 ℃ of roastings, can obtain fine catalyst.Add mixture, the adding bonding agent of other component, be prepared into slurries, be coated on the carrier, drying and roasting makes integral catalyzer.
Description of drawings
Fig. 1 is activity rating result one;
Fig. 2 is activity rating result two.
The specific embodiment
The present invention is further described below in conjunction with the specific embodiment, and the specific embodiment is to the further specifying of the principle of the invention, and does not limit the present invention in any way, or similar techniques identical with the present invention all do not exceed the scope of protection of the invention.
Embodiment 1
10%Ce/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing cerous nitrate [Ce (NO
3)
3.6H
2O] 251.28g, γ-Al
2O
3880.00g.With [Ce (NO
3)
3.6H
2O] 251.28g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.With γ-Al
2O
3880.00g add in the good cerous nitrate solution of dissolving, the rear placement 1 hour that stirs, then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Ce/ γ-Al
2O
3Powder.Take by weighing palladium nitrate [Pd (NO
3)
2] 127.15g adds in the 533.33g deionized water, stir, with Ce/ γ-Al
2O
3Powder adds in the palladium nitrate solution, and rear placement 1 hour stirs rapidly.Then 80 ℃ of vacuum drying are 8 hours, and 550 ℃ of calcinings 2 hours obtain Pd/Ce/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3Single palladium catalyst.
Embodiment 2
10%Ce/ γ-Al
2O
3Load contains the preparation of 2.0%Pt catalyst
Ce/ γ-Al
2O
3Preparation identical with embodiment 1.Take by weighing palladium nitrate [Pt (NO
3)
2] 65.57g adds in the 533.33g deionized water, stir, with Ce/ γ-Al
2O
3Powder adds in the palladium nitrate solution, and rear placement 1 hour stirs rapidly.Then 80 ℃ of vacuum are done dry 8 hours, 550 ℃ of calcinings 2 hours obtain Pt/Ce/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3Single platinum catalyst.
Embodiment 3
10%Zr/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [Zr (NO
3)
4.3H
2O] 333.33g, γ-Al
2O
3880.00g.With [Zr (NO
3)
4.3H
2O] 333.33g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.All the other steps are identical with embodiment 1 method, and can get bullion content is 80g/ft
3Single palladium catalyst.
Embodiment 4
10%Y/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [Y (NO
3)
4.H
2O] 340.14g, γ-Al
2O
3880.00g.With [Y (NO
3)
4.H
2O] 340.14g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.All the other steps are identical with embodiment 1 method, and can get bullion content is 80g/ft
3Single palladium catalyst.
Embodiment 5
10%La/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [La (NO
3)
4.6H
2O] 270.27g, γ-Al
2O
3880.00g.With [La (NO
3)
4.6H
2O] 270.27g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.All the other steps are identical with embodiment 1 method, and can get bullion content is 80g/ft
3Single palladium catalyst.
More than each chemical reagent, nitrate etc. all have commercially available.
Testing result
Catalyst among the above embodiment is carried out active evaluation test.Experimental condition is as follows:
Simulation lean-combustion engine tail gas gas volume forms: methane: 1000ppm, and carbon monoxide: 3000ppm, carbon dioxide: 10%, nitric oxide: 1000ppm oxygen: 6.5%, nitrogen: Balance Air; Air speed: 40000h
-1
Activity rating result such as Fig. 1: the activity rating data that represent respectively embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5 among the figure.
The different embodiment catalyst of table 1 CH
4Activity data, table 1
| T 50（℃） | T 90（℃） | |
| Embodiment 1 | 410 | 514 |
| Embodiment 2 | 510 | >600 |
| Embodiment 3 | 366 | 425 |
| Embodiment 4 | 375 | 466 |
| Embodiment 5 | 430 | 540 |
Can learn from table 1:
(1) 1 couple of CH of embodiment
4Catalyst performance obviously be better than embodiment 2, illustrate CH
4Catalytic effect Pd be better than Pt.
(2) embodiment 1, embodiment 3, embodiment 4, embodiment 5, compare, to CH
4Catalyst performance, the order of quality of adding rare earth is: Zr〉Y La Ce.
Embodiment 6:
10%Zr-10%Y/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [Zr (NO
3)
4.3H
2O] 333.33g, [Y (NO
3)
4.H
2O] 340.14g, γ-Al
2O
3880.00g.With [Zr (NO
3)
4.3H
2O] 333.33g and [Y (NO
3)
4.H
2O] 340.14g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.With γ-Al
2O
3880.00g add in the good mixed solution of dissolving, the rear placement 1 hour that stirs, then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Y-Zr/ γ-Al
2O
3Powder.Take by weighing palladium nitrate [Pd (NO
3)
2] 127.15g adds in the 533.33g deionized water, stir, with Y-Zr/ γ-Al
2O
3Powder adds in the palladium nitrate solution that stirs, and rear placement 1 hour stirs rapidly., then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Pd/Y-Zr/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3Single palladium catalyst.
Embodiment 7:
10%Zr-10%La/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [Zr (NO
3)
4.3H
2O] 333.33g, [La (NO
3)
4.6H
2O] 270.27g, γ-Al
2O
3880.00g.With [Zr (NO
3)
4.3H
2O] 333.33g and [La (NO
3)
4.6H
2O] 270.27g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.With γ-Al
2O
3880.00g add in the good mixed solution of dissolving, the rear placement 1 hour that stirs, then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain La-Zr/ γ-Al
2O
3Powder.Take by weighing palladium nitrate [Pd (NO
3)
2] 127.15g adds in the 533.33g deionized water, stir, with La-Zr/ γ-Al
2O
3Powder adds in the palladium nitrate solution that stirs, and rear placement 1 hour stirs rapidly., then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Pd/La-Zr/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3Single palladium catalyst.
Embodiment 8:
10%Zr-10%Ce/ γ-Al
2O
3Load contains the preparation of 2.0%Pd catalyst
Take by weighing zirconium nitrate [Zr (NO
3)
4.3H
2O] 333.33g, [Ce (NO
3)
4.6H
2O] 251.28g, γ-Al
2O
3880.00g.With [Zr (NO
3)
4.3H
2O] 333.33g and [Ce (NO
3)
4.6H
2O] 251.28g is dissolved in the 600g deionized water, and stirring and dissolving is to settled solution.With γ-Al
2O
3880.00g add in the good mixed solution of dissolving, the rear placement 1 hour that stirs, then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Ce-Zr/ γ-Al
2O
3Powder.Take by weighing palladium nitrate [Pd (NO
3)
2] 127.15g adds in the 533.33g deionized water, stir, with Ce-Zr/ γ-Al
2O
3Powder adds in the palladium nitrate solution that stirs, and rear placement 1 hour stirs rapidly., then 80 ℃ of vacuum drying are 8 hours, and 600 ℃ of calcinings 3 hours obtain Pd/Ce-Zr/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3Single palladium catalyst.
Catalyst in the above improvement example is carried out active evaluation test, and test result such as Fig. 2 represent respectively the activity rating data of embodiment 6, embodiment 7, embodiment 8, embodiment 3 among the figure.
Table 2 embodiment 6,7,8 catalyst CH
4Activity data, table 2
| T 50（℃） | T 90（℃） | |
| Embodiment 6 | 340 | 376 |
| Embodiment 7 | 372 | 448 |
| Embodiment 8 | 348 | 391 |
| Embodiment 3 | 366 | 425 |
Can learn from table 2:
(1) embodiment 6, embodiment 8 performances are better than embodiment 7, and γ-Al is described
2O
3When adding Zr, the interpolation of Y is conducive to improve the performance of catalyst most.
Comparative example 1:
10%Zr-10%Y/ γ-Al
2O
3Load contains the preparation of 2.0%Pd-Pt (5:1) catalyst
Take by weighing palladium nitrate [Pd (NO
3)
2] 105.96g, [Pt (NO
3)
2] 10.93g adds in the 533.33g deionized water, stir.Adopt embodiment 6 same procedure to prepare Y-Zr/ γ-Al
2O
3Powder is with Y-Zr/ γ-Al
2O
3Powder adds in the palladium nitrate and platinum nitrate mixed solution that stirs, and rear placement 1 hour stirs rapidly.Then 80 ℃ of vacuum drying are 8 hours, and 550 ℃ of calcinings 2 hours obtain Pd-Pt/Y-Zr/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3The palladium platinum catalyst.
Comparative example 2:
10%Zr-10%Ce/ γ-Al
2O
3Load contains the preparation of 2.0%Pd-Pt (12:1) catalyst
Take by weighing palladium nitrate [Pd (NO
3)
2] 136.05g, [Pt (NO
3)
2] 5.04g adds in the 533.33g deionized water, stir.Adopt embodiment 8 same procedure to prepare Ce-Zr/ γ-Al
2O
3Powder is with Ce-Zr/ γ-Al
2O
3Powder adds in the palladium nitrate and platinum nitrate mixed solution that stirs, and rear placement 1 hour stirs rapidly.Then 80 ℃ of vacuum drying are 8 hours, and 550 ℃ of calcinings 2 hours obtain Pd-Pt/Ce-Zr/ γ-Al
2O
3Powder (being the khaki powder).Add bonding agent in the khaki powder powder, be prepared into slurries, be coated in the hole order and count 400cell/in
2, on the volume 2.5ml cordierite ceramic honeycomb carrier, drying and roasting, being bullion content is 80g/ft
3The palladium platinum catalyst.
Comparative example catalyst CH
4Activity data, table 3
| T 50（℃） | T 90（℃） | |
| Comparative example 1 | 332 | 365 |
| Comparative example 2 | 338 | 376 |
Can learn from table 3:
(1) after the Pd of part substitutes with Pt, under the synergy of Pd, Pt, better than independent Pd catalyst effect to the catalytic effect of methane.
(2) comparative example 1, comparative example 2 are good lean burn natural gas tail gas and process catalyst.
The car load bench test is as follows:
Scheme one: adopt γ-Al
2O
3Load contains 2.0%(4.16%) Pd-Pt (5:1) catalyst, add bonding agent, be prepared into slurries, be coated on the ceramic honeycomb carrier, 550 ℃ of roasting 2h make catalyst (Pt:Pd:Rh=1:5:0,80g/ft
3(150g/ft
3)).The carrier specification is: the hole order is counted 300cell/in
2, overall dimensions Ф 190mm(diameter) * 100(length).
Scheme two; With comparative example 1(10%Y-10%Zr/ γ-Al
2O
3Load contains 2.0%(4.16%) Pd-Pt (5:1) catalyst), add bonding agent, be prepared into slurries, be coated on the ceramic honeycomb carrier, 550 ℃ of roasting 2h make catalyst (Pt:Pd:Rh=1:5:0,80g/ft
3(150g/ft
3)).The carrier specification is: the hole order is counted 300cell/in
2, overall dimensions Ф 190mm(diameter) * 100(length).
The engine model that above-mentioned catalyst is installed on certain company's production is the NQ200N4 bus, adopts the ETC test procedure of Chinese Industrial Standards (CIS) state four regulations, carries out bench test.The result is as follows:
NQ200N4 engine ETC result of the test, table 4
| Interventions Requested | Standard limited value | Scheme one result of the test | Scheme two result of the tests |
| COg/(kW·h) | 4.0 | 0.354 | 0.195 |
| NO xg/(kW·h) | 3.5 | 3.376 | 3.429 |
| CH 4g/(kW·h) | 1.1 | 1.258 | 0.566（0.166） |
| NMHCg/(kW·h) | 0.55 | 0.376 | 0.276 |
Can be drawn two couples of CH of scheme by NQ200N4 engine ETC result of the test
4Purifying property obviously be better than scheme one.
This example adopts the preparation method of comparative example 1, is prepared into 10%Zr-10%Y/ γ-Al
2O
3Load contains 2.0%Pd-Pt (5:1) catalyst, and the catalyst of the method preparation has excellent CH
4Conversion performance is used for the processing of lean burn natural gas tail gas and has optimal result, meets the corresponding all standard of country and requirement.
Claims (3)
1. one kind is applicable to the catalyst that the lean burn natural gas tail gas is processed, and it is characterized in that: described catalyst is that noble metal and rare earth metal are loaded on carrier γ-Al
2O
3Make, wherein noble metal is that Pt and/or Pd, rare earth metal are Zr, Y, La and/or Ce, and the weight percent content of noble metal and rare earth metal is:
Noble metal 2.0%, wherein the part by weight of Pt and Pd is Pd:Pt=1～0:0～1;
Rare earth metal Zr10%, rare earth metal y 0～10%, rare-earth metal La 0～10%, rare earth metal Ce0～10%.
2. according to claim 1ly be applicable to the catalyst that the lean burn natural gas tail gas is processed, it is characterized in that: the weight percent content of preferred noble metal and rare earth metal is:
Noble metal 2.0%, wherein the part by weight of Pt and Pd is Pd:Pt=5:1;
Rare earth metal Zr10%, rare earth metal y 10%.
3. a claim 1 or 2 describedly is applicable to the preparation methods that the lean burn natural gas tail gas is processed catalyst, it is characterized in that may further comprise the steps:
(1), form according to described catalyst, take by weighing respectively corresponding rare-earth metal nitrate and γ-Al
2O
3Powder;
(2), with the rare-earth metal nitrate that (1) step takes by weighing, be dissolved in the deionized water, the addition of deionized water is γ-Al
2O
30.9～0.1 times of water absorption;
(3), the γ-Al that (1) step is taken by weighing
2O
3Add in the salting liquid of (2) step, stir rapidly, room temperature standing time 〉=1 hour, 8 hours, 600 ℃ calcinings of 80 ℃ of vacuum drying 3 hours obtain γ-Al that a kind of load has rare-earth oxide
2O
3Powder;
(4), form by described catalyst and to take by weighing palladium nitrate and/or platinum nitrate, add suitable quantity of water, amount of water is γ-Al
2O
30.8～0.9 times of quality mixes;
(5), step (3) gained powder is added in the solution of step (4); Be stirred to rapidly evenly, standing time 〉=1 hour, 80 ℃ of vacuum drying 8 hours, 550 ℃ of calcinings 2 hours obtain a kind of powder that contains noble metal;
(6), mixture that powder and other of step (5) gained noble metal need to be added component adds bonding agent, is prepared into slurries, be coated on the catalyst converter carrier, 120 ℃ of dryings 2 hours, 550 ℃ of calcinings 2 hours make catalyst.
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| CN104056626A (en) * | 2014-07-22 | 2014-09-24 | 四川中自尾气净化有限公司 | Preparation method of noble metal catalyst |
| CN105498760A (en) * | 2015-12-04 | 2016-04-20 | 中自环保科技股份有限公司 | Preparation method of hydrothermal-aging-resisting catalyst for exhaust treatment for natural-gas-fueled vehicle |
| CN105664939A (en) * | 2016-01-06 | 2016-06-15 | 中自环保科技股份有限公司 | Catalytic converter for treating motorcycle tail gas and preparation method thereof |
| CN112675845A (en) * | 2020-12-28 | 2021-04-20 | 四川大学 | Pd-Rh single-coating catalyst for purifying tail gas of natural gas vehicle and preparation method thereof |
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| CN105664939B (en) * | 2016-01-06 | 2018-01-12 | 中自环保科技股份有限公司 | A kind of catalytic converter for motorcycle exhaust processing and preparation method thereof |
| CN112675845A (en) * | 2020-12-28 | 2021-04-20 | 四川大学 | Pd-Rh single-coating catalyst for purifying tail gas of natural gas vehicle and preparation method thereof |
| CN112675845B (en) * | 2020-12-28 | 2022-03-29 | 四川大学 | Pd-Rh single-coating catalyst for purifying tail gas of natural gas vehicle and preparation method thereof |
| CN114950422A (en) * | 2022-06-29 | 2022-08-30 | 潍柴动力股份有限公司 | Methane oxidation catalyst and preparation method and application thereof |
| CN114950422B (en) * | 2022-06-29 | 2024-03-19 | 潍柴动力股份有限公司 | Methane oxidation catalyst and preparation method and application thereof |
| CN115445613A (en) * | 2022-08-11 | 2022-12-09 | 凯龙蓝烽新材料科技有限公司 | Coating for lean-burn CNG catalyst and preparation method thereof |
| CN115779900A (en) * | 2022-10-25 | 2023-03-14 | 中船动力(集团)有限公司 | Tail gas CH for natural gas engine of ship 4 Purified oxidation catalyst, method for the production thereof and use thereof |
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Address after: 611731, No. 88, Nan Jie street, hi tech Zone, Sichuan, Chengdu Applicant after: Sichuan Zhongzi Exhaust Purge Co., Ltd. Address before: 611731, No. 12, West core road, West District, Chengdu hi tech Zone, Sichuan Applicant before: Sichuan Zhongzi Exhaust Purge Co., Ltd. |
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Address after: 611731, No. 88, Nan Jie street, hi tech Zone, Sichuan, Chengdu Patentee after: SINOCAT ENVIRONMENTAL TECHNOLOGY CO., LTD. Address before: 611731, No. 88, Nan Jie street, hi tech Zone, Sichuan, Chengdu Patentee before: Sichuan Zhongzi Exhaust Purge Co., Ltd. |