CN110124667B - Diesel catalyst capable of replacing DOC + CDPF system - Google Patents

Diesel catalyst capable of replacing DOC + CDPF system Download PDF

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CN110124667B
CN110124667B CN201910358366.9A CN201910358366A CN110124667B CN 110124667 B CN110124667 B CN 110124667B CN 201910358366 A CN201910358366 A CN 201910358366A CN 110124667 B CN110124667 B CN 110124667B
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oxide
carrier
auxiliary agent
binder
platinum
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CN110124667A (en
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汪朝强
朱敬芳
常仕英
于飞
贺小昆
杨冬霞
马江丽
赖慧龙
殷雪梅
冯丰
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Kunming Sino Platinum Metals Catalyst Co ltd
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Kunming Sino Platinum Metals Catalyst Co ltd
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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
    • B01J23/002—Mixed oxides other than spinels, e.g. perovskite
    • 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
    • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
    • B01J23/44—Palladium
    • 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
    • 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
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/20—Carbon compounds
    • B01J27/22—Carbides
    • B01J27/224—Silicon carbide
    • 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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • 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
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

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  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
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Abstract

A novel diesel catalyst capable of replacing a DOC + CDPF system is composed of a carrier for trapping particulate matters discharged from a diesel engine, an active component, a carrier and an auxiliary agent, and is characterized in that: the carrier is a symmetrical or asymmetrical honeycomb wall-flow pore channel structure, and the porosity of the carrier is 35-70%; the active component is one or two of platinum and palladium, and the loading capacity is 3-100g/ft3(ii) a The supporter is the oxide of alumina, silicon oxide, titanium oxide, molecular sieve and their mixture, the weight percent content is greater than 60% of the total load dry weight; the auxiliary agent is one or a compound of more than two of cerium oxide, zirconium oxide, lanthanum oxide, praseodymium oxide, yttrium oxide and neodymium oxide, and the weight percentage content is 0-40% of the total load dry weight. The invention can replace the DOC + CDPF system of the present mainstream, reduce the aftertreatment space of the diesel engine, reduce the aftertreatment cost.

Description

Diesel catalyst capable of replacing DOC + CDPF system
Technical Field
The invention relates to the technical field of diesel engine tail gas purification, in particular to the technical field of a novel diesel engine tail gas purification catalyst with DOC and CDPF functions.
Background
The diesel vehicle engine has better fuel economy and higher power performance, and is the first choice for people to use as medium and large-sized and commercial vehicles. Along with the rapid engine of the diesel vehicleThe application is wider and wider, and the diesel vehicle engine accounts for a larger and larger share in the market. The large number of vehicles brings with it a great deal of pollution. According to incomplete statistics, the number of vehicles used in China is more than 2 hundred million, and a great number of pollution sources are formed. The pollutants in the tail gas discharged by the diesel engine comprise HC, CO and NOXAnd particulate matter (PM2.5), 670 in total. HC contains polycyclic aromatic hydrocarbon, high carcinogenic and highly toxic compounds such as aldehydic acid, CO and NOx are harmful to human bodies, HC, CO and NOx participate in the formation of surface ozone and peroxide (all carcinogenic pathogenic substances), the particle size of PM2.5 discharged by motor vehicles is 0.04-0.3 micrometer (0.3 of diesel vehicles, 0.1 of gasoline vehicles and 0.04 of motorcycles), the particle size is far smaller than 2.5 micrometers, the PM2.5 discharged by the motor vehicles not only enters the lung but also enters the blood, the particle size is small, the harm to the human bodies is huge, the PM2.5 discharged by the motor vehicles contains 16 high carcinogenic substances such as Polycyclic Aromatic Hydrocarbon (PAHs) and polycyclic aromatic hydrocarbon (nitro-PAHs), the pollutants with the greatest toxicity and the greatest harm are pollutants, and corresponding catalysts are required to purify different pollutants. Typically, DOC treats CO, HC, etc., CDPF treats particulates, SCR treats NOx。
Before national IV, the aftertreatment of the diesel vehicle only needs one DOC, and national V is to NOxThe diesel vehicle aftertreatment requires the addition of an SCR, namely DOC + SCR. With the increasing strictness of emission regulations, the six diesel engines/vehicles in China put forward corresponding requirements on PN, and in order to meet the requirements of PM and PN, the combined use of emission post-treatment technologies such as DOC, DPF, SCR and ASC aiming at diesel vehicle engines becomes a necessary trend, and DOC + CDPF + SCR + ASC is the most mainstream post-treatment emission technology route. The self-exhaust gas purification Limited company in Sichuan discloses a preparation method (CN105056970A) of a diesel vehicle catalyst type particle purifier, and the patent invents that Pt-Pd/Co is utilized2O3/CeO2-ZrO2The catalyst is a catalyst component for catalyzing and oxidizing the soot, can obviously reduce the ignition temperature of the soot, has good ageing resistance, and can realize the activity of the catalyst in a high-temperature environment in the regeneration process; BASFSE discloses a Diesel oxidative catalyst with a layered structure conPatent of dyeing ceria composition as palladium supported material for enhanced HC and CO gas conversion, which discloses a DOC layered coating formulation and technology to make HC and CO have more excellent light-off characteristics, however, these patents only relate to the catalytic oxidation performance of CDPF and DOC catalysts respectively, and do not relate to a multi-effect catalyst which can trap and oxidize soot and HC and CO simultaneously. In order to meet stringent emission regulations, diesel vehicle aftertreatment systems have become more and more lengthy and costly, and the thermal energy emitted by the engine cannot be utilized reasonably enough by the aftertreatment systems. Therefore, the novel diesel engine catalyst (DDPF) capable of replacing a DOC + CDPF system can have the functions of both DOC and CDPF, and has the functions of oxidizing CO, HC compounds, NO, SOF and soot simultaneously by virtue of the high-efficiency oxidation coating.
Disclosure of Invention
The invention provides a novel diesel catalyst capable of replacing a DOC + CDPF system, which can be used for replacing the DOC + CDPF system which is mainstream at present and reducing the aftertreatment space of a diesel engine.
A novel diesel catalyst capable of replacing a DOC + CDPF system is composed of a carrier for trapping particulate matters discharged from a diesel engine, an active component, a carrier and an auxiliary agent, and is characterized in that: the carrier is of a symmetrical or asymmetrical honeycomb wall-flow pore channel structure, and the porosity of the carrier is 35-70%; the active component is one or two of platinum and palladium, and the loading capacity is 3-100g/ft3(ii) a The supporter is the oxide of alumina, silicon oxide, titanium oxide, molecular sieve and their mixture, the weight percent content is greater than 60% of the total load dry weight; the auxiliary agent is one or a compound of more than two of cerium oxide, zirconium oxide, lanthanum oxide, praseodymium oxide, yttrium oxide and neodymium oxide, and the weight percentage content is 0-40% of the total load dry weight.
Preferably, the pore channel structure of the carrier is triangular, circular, square, hexagonal or octagonal; the carrier material is cordierite, silicon carbide, aluminum titanate and metal carrier.
Preferably, the molecular sieve in the carrier is one, two or more of MOR, Beta, CHA and YSA.
The invention also provides a preparation method of the novel diesel engine tail gas purification catalyst with DOC and CDPF effects, which is characterized by comprising the following steps:
1. proportionally taking a supporter, adding the supporter material into deionized water, and stirring;
2. taking one or two of platinum and palladium as active components according to a proportion, adding the active components into the solution obtained in the step 1, and adjusting the pH range to 4-10;
3. and (3) taking the auxiliary agent according to the proportion, adding the auxiliary agent into the solution obtained in the step (2), and stirring, wherein the weight percentage content of the auxiliary agent is 0-40% of the total load dry weight. (ii) a
4. Taking a binder according to a proportion, adding the binder into the solution obtained in the step (3), wherein the addition amount of the binder is 1-10% of the total mass of the solid, and stirring;
5. grinding the mixed slurry formed in the step 4 to a particle size D through a grinding machine50:0.1-5μm，D90Is 1-10 μm;
6. coating the slurry obtained in the step (5) on a particle trapping carrier, drying and roasting at the roasting temperature of 500-600 ℃ for 2-3h to form a fixed coating on the carrier by the mixed slurry, wherein the loading capacity of the noble metal is 3-100g/ft3The total loading of the coating is 5-200 g/L.
Preferably, in the step 2, the dosage of the noble metal solution is calculated according to the loading capacity of the active components, and the noble metal solution is added in the form of platinum nitrate, ethanolamine hydroxyl platinum, nitroso-tetraammonium platinum, chloroplatinic acid, palladium nitrate, palladium acetate and palladium chloride; the acid used for adjusting the pH value is acetic acid, and the alkali used is ammonia water.
Preferably, the binder in step 4 comprises Al2O3、SiO2、TiO2、ZrO2One or more of powder or colloid; by oxidation of added bindersCalculated according to the materials, the adding amount is 1-10% of the total mass of the used solid;
preferably, step 5 grinds particle size range D by a grinder50:0.1-5μm，D90Is 1-10 μm.
Has the advantages that: the invention discloses a novel diesel catalyst (DDPF) capable of replacing a DOC + CDPF system, which can simultaneously have the functions of DOC and CDPF, and has a high-efficiency oxidation coating, so that the catalyst has the effects of oxidizing CO, HC compounds, NO, SOF and carbon smoke.
Drawings
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
FIG. 1 is a graph of the effect of different loadings on CO light-off characteristics
FIG. 2 is a graph showing the influence of different load amounts on HC light-off characteristics
FIG. 3 is a graph of the effect of different loading on balance point temperature and pressure drop characteristics
FIG. 4 is a graph of the effect of different noble metal ratios on CO light-off characteristics
FIG. 5 is a graph showing the effect of different noble metal ratios on HC light-off characteristics
FIG. 6 is a graph of the effect of different noble metal ratios on equilibrium point temperature and pressure drop characteristics
FIG. 7 is a graph of the effect of different noble metal contents on CO light-off characteristics
FIG. 8 is a graph of the effect of different precious metal contents on HC light-off characteristics
FIG. 9 is a graph of the effect of different noble metal contents on equilibrium point temperature and pressure drop characteristics
FIG. 10 is a graph of the effect of different catalyst active components on CO light-off characteristics
FIG. 11 is a graph of the effect of different catalyst active components on HC light-off characteristics
FIG. 12 is a graph of the effect of different catalyst active components on equilibrium point temperature and pressure drop characteristics
Detailed Description
To further illustrate the technical means adopted by the present invention and the effects thereof, the following detailed description is given with reference to the preferred examples of the present invention.
Example 1
The substrate of the particulate trap is an asymmetric structure carrier which is produced by Corning corporation and has the mesh number of 300 meshes, the wall thickness of 9mil, cordierite material and the diameter of 190.5mm and the height of 177.8 mm; the catalyst composition is selected from ethanolamine hydroxyl platinum and palladium chloride (Pt: Pd ═ 4:1), and the rare earth metal oxide is selected from cerium oxide and lanthanum oxide; the carrier material is Al2O3。
1000g of Al2O3200g of cerium oxide, 50g of lanthanum oxide and 3000g of deionized water are stirred and mixed, then ethanolamine hydroxyl platinum (containing 5.96g of platinum) and palladium chloride (containing 1.49g of palladium) solution are slowly dropped into the mixture, and the pH value is adjusted to 6 by acetic acid or ammonia water; 300g of a 20% Al alloy was added2O3The aluminum paste is fully stirred, and the mixed slurry is ground to D90: 5.3 μm, D50:1.2 μm; coating the slurry on the carrier, drying at 120 ℃ and roasting at 550 ℃ for 3h to form a fixed coating on the surface of the honeycomb shaping substrate by using the mixed slurry, and obtaining the final load of 150g/L and 25g/ft of precious metal3The catalyst of (1);
example 2
The substrate of the particulate trap is a symmetrical carrier which is produced by NGK company and has 300 meshes, 9mil wall thickness, silicon carbide material, 143.8mm diameter and 177.8mm height; the catalyst composition is selected from nitroso-tetraammonium platinum and palladium acetate (Pt: Pd ═ 2:1), and the rare earth metal oxide is selected from cerium oxide and lanthanum oxide; the carrier material is Al2O3。
1000g of Al2O3240g of cerium oxide, 12g of lanthanum oxide, 30g of zirconium oxide, 21g of praseodymium oxide and 3000g of deionized water are stirred and mixed, then a solution of nitrosotetraammonium platinum (containing 7.72g of platinum) and palladium acetate (containing 3.86g of palladium) is slowly dropped into the mixture, and the pH value is adjusted to 5 by acetic acid or ammonia water; 350g of 20% Al were added2O3The aluminum paste is fully stirred, and the mixed slurry is ground to D90: 6.8 μm, D50:1.4 μm; coating the slurry on a carrier, drying at 120 ℃ and roasting at 550 ℃ for 3h to obtain a mixed slurryForming a fixed coating on the surface of the honeycomb shaping substrate to obtain the final load of 120g/L and the noble metal of 30g/ft3The catalyst of (1);
example 3
Using only Al2O3As a carrier material, without adding any auxiliary agent such as rare earth oxide and the like, ethanolamine hydroxyl platinum and palladium nitrate are used as catalytic active components, three different catalysts with the loading amounts of 80, 120 and 160g/L are prepared according to the preparation method of the embodiment 1, wherein the loading amounts of the noble metals of the three catalysts are 25g/ft3And Pt: Pd is 2:1, and the CO, HC light-off characteristics and the equilibrium point temperature and pressure drop characteristics are compared as shown in fig. 1, 2, 3. The ignition characteristics of CO and HC were evaluated by a small sample of the catalyst, the balance point temperature and pressure drop characteristics were evaluated by the stage performance, and the trapping efficiency was 99.5%.
The monolith catalyst pilot conditions were tested as follows: specification phi 25.4mm × 76.2mm, composition of reaction mixture: [ C ]3H6]＝1000ppm,[CO]＝100ppm,[NO]＝210ppm,[H2O]＝5％，[O2]＝10％， [CO2]＝8％,N2As balance gas, the space velocity is 60,000h-1After the temperature of the reaction mixed gas is stabilized at 100 ℃, the temperature is programmed to 500 ℃.
As can be seen from FIGS. 1, 2 and 3, the catalyst of the present invention has not only excellent CO and HC oxidizing ability, but also excellent soot oxidizing ability, and the equilibrium point temperature is 350 ℃. However, it can be seen from fig. 3 that the exhaust pressure drop is continuously increased as the load amount is continuously increased.
Example 4
Using only Al2O3As a carrier material, without adding any auxiliary agent such as rare earth oxide and the like, ethanolamine hydroxyl platinum and palladium nitrate are used as catalytic active components, and according to the preparation method of the example 1, the prepared precious metal loading amounts are respectively 20, 40 and 60g/ft3All three catalysts of (2) were loaded at 120g/L and Pt: Pd was 2:1, and their CO, HC light-off characteristics and equilibrium point temperature and pressure drop characteristics were compared, as shown in fig. 4, 5, 6. Wherein the ignition characteristics of CO and HC are obtained byThe catalyst was evaluated in small samples, the balance point temperature and pressure drop characteristics were evaluated by bench performance, and the trapping efficiency was 99.7%.
The monolith catalyst pilot conditions were tested as follows: specification phi 25.4mm × 76.2mm, composition of reaction mixture: [ C ]3H6]＝1000ppm，[CO]＝100ppm,[NO]＝210ppm，[H2O]＝5％，[O2]＝10％， [CO2]＝8％,N2As balance gas, the space velocity is 60,000h-1After the temperature of the reaction mixed gas is stabilized at 100 ℃, the temperature is programmed to 500 ℃.
As can be seen from fig. 4, 5 and 6, the catalyst of the present invention not only has excellent oxidation capability of CO and HC, but also has excellent oxidation capability of soot, and the equilibrium point temperature is 350 ℃.
Example 5
Using only Al2O3The carrier material is not added with any auxiliary agent such as rare earth oxide, ethanolamine hydroxyl platinum and palladium nitrate are used as catalytic active components, three catalysts with Pt and Pd respectively being 1:0, 2:1 and 10:1 are prepared according to the preparation method of the embodiment 1, wherein the noble metal loading of the three catalysts is 25g/ft3The load amount was 120g/L, and the CO and HC light-off characteristics and the equilibrium point temperature and pressure drop characteristics were compared, as shown in FIGS. 7, 8 and 9. The ignition characteristics of CO and HC were evaluated by a small sample of the catalyst, the balance point temperature and pressure drop characteristics were evaluated by the stage performance, and the trapping efficiency was 99.6%.
The monolith catalyst pilot conditions were tested as follows: specification phi 25.4mm × 76.2mm, composition of reaction mixture: [ C ]3H6]＝1000ppm,[CO]＝100ppm,[NO]＝210ppm,[H2O]＝5％，[O2]＝10％， [CO2]＝8％,N2As balance gas, the space velocity is 60,000h-1After the temperature of the reaction mixed gas is stabilized at 100 ℃, the temperature is programmed to 500 ℃.
As can be seen from FIGS. 7, 8 and 9, the invention has not only excellent CO and HC oxidizing ability, but also excellent soot oxidizing ability, and the equilibrium point temperature is 350 ℃.
Example 6
According to the preparation method of example 1, Al is used according to different active materials A2O3：SiO2： CeO275:10: 15; b is Al2O3：SiO2：CeO2：ZrO2：Pr6O11:La2O370: 10: 16: 2: 1.4: 0.6; c is Al2O3A, B, C catalysts of three different materials were prepared, wherein the three different materials all had a catalyst loading of 120g/L and a precious metal loading of 25g/ft3And Pt: Pd is 2:1, and the CO, HC light-off characteristics and the equilibrium point temperature and pressure drop characteristics are compared as shown in fig. 10, 11, 12. The ignition characteristics of CO and HC were evaluated by a small sample of the catalyst, the balance point temperature and pressure drop characteristics were evaluated by the stage performance, and the trapping efficiency was 99.6%.
The monolith catalyst pilot conditions were tested as follows: specification phi 25.4mm × 76.2mm, composition of reaction mixture: [ C ]3H6]＝1000ppm,[CO]＝100ppm,[NO]＝210ppm,[H2O]＝5％，[O2]＝10％， [CO2]＝8％,N2As balance gas, the space velocity is 60,000h-1After the temperature of the reaction mixed gas is stabilized at 100 ℃, the temperature is programmed to 500 ℃.
As can be seen from fig. 10, 11 and 12, the invention of the present invention not only has excellent oxidation capability of CO and HC, but also has excellent oxidation capability of soot, and the equilibrium point temperature is 350 ℃.
From fig. 1 to fig. 12, it can be seen that the invention of the present invention not only has excellent oxidation capability of CO and HC, but also has excellent soot oxidation capability, and has potential to replace the current mainstream DOC + CDPF system.
The applicant states that the present invention is illustrated in detail by the above examples, but the present invention is not limited to the above detailed methods, i.e. it is not meant that the present invention must rely on the above detailed methods for its implementation. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

Claims (5)

1. A diesel catalyst for replacing DOC + CDPF system, composed of carrier, active component, supporter and auxiliary agent for trapping particulate matters discharged from diesel engine, is characterized in that: the carrier is of a symmetrical or asymmetrical honeycomb wall-flow pore channel structure, and the pore channel structure of the carrier is triangular, circular, square, hexagonal or octagonal; the carrier material is cordierite or silicon carbide, and the porosity of the carrier is 55-70%; the active component is one or two of platinum and palladium; the supporter is alumina, and the weight percentage content is more than 60% of the dry weight of the total load; the auxiliary agent is one or a compound of more than two of cerium oxide, zirconium oxide, lanthanum oxide, praseodymium oxide, yttrium oxide and neodymium oxide, the weight percentage content is 0-40% of the total load dry weight, the auxiliary agent is not zero,
the preparation method of the diesel engine catalyst comprises the following steps:
(1) proportionally taking a supporter, adding the supporter material into deionized water, and stirring;
(2) taking one or two of platinum and palladium as active components according to a proportion, adding the active components into the solution obtained in the step 1, and adjusting the pH range to 4-10;
(3) taking an auxiliary agent according to a proportion, adding the auxiliary agent into the solution obtained in the step (2), and stirring, wherein the weight percentage content of the auxiliary agent is 0-40% of the dry weight of the total load;
(4) taking a binder according to a proportion, adding the binder into the solution obtained in the step (3), wherein the addition amount of the binder is 1-10% of the total mass of the solid, calculated according to the oxide, and stirring;
(5) grinding the mixed slurry formed in the step (4) to a particle size D through a grinding machine50:0.1-5μm，D90Is 1-10 μm;
(6) and (3) coating the slurry obtained in the step (5) on a particle trapping carrier, drying and roasting at the roasting temperature of 500-600 ℃ for 2-3h to form a fixed coating on the carrier by the mixed slurry, wherein the loading capacity of the precious metal is 20-100g/ft3, and the total loading capacity of the coating is 50-180 g/L.
2. A method of preparing a diesel catalyst as claimed in claim 1, comprising the steps of: (1) proportionally taking a supporter, adding the supporter material into deionized water, and stirring;
(2) taking one or two of platinum and palladium as active components according to a proportion, adding the active components into the solution obtained in the step 1, and adjusting the pH range to 4-10;
(3) taking an auxiliary agent according to a proportion, adding the auxiliary agent into the solution obtained in the step (2), and stirring, wherein the weight percentage content of the auxiliary agent is 0-40% of the dry weight of the total load;
(4) taking a binder according to a proportion, adding the binder into the solution obtained in the step (3), wherein the addition amount of the binder is 1-10% of the total mass of the solid, calculated according to the oxide, and stirring;
(5) grinding the mixed slurry formed in the step (4) to a particle size D through a grinding machine50:0.1-5μm，D90Is 1-10 μm;
(6) and (3) coating the slurry obtained in the step (5) on a particle trapping carrier, drying and roasting at the roasting temperature of 500-600 ℃ for 2-3h to form a fixed coating on the carrier by the mixed slurry, wherein the loading capacity of the precious metal is 20-100g/ft3, and the total loading capacity of the coating is 50-180 g/L.
3. The method for producing a diesel catalyst according to claim 2, characterized in that: in the step (2), the dosage of the required noble metal solution is calculated according to the loading capacity of the active components, and the metal solution is added in the form of platinum nitrate, ethanolamine hydroxyl platinum, nitroso-tetraammonium platinum, chloroplatinic acid, palladium nitrate, palladium acetate and palladium chloride; the acid used for adjusting the pH value is acetic acid, and the alkali used is ammonia water.
4. The method for producing a diesel catalyst according to claim 2, characterized in that: the binder in the step (4) comprises Al2O3、SiO2、TiO2、ZrO2One or more of powder or colloid; the added binder is added in an amount of 1-10% by weight of the total mass of the solids, calculated as oxides.
5. Use of the diesel catalyst of claim 1 as a replacement for a DOC + CDPF system.
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CN112412588A (en) * 2019-08-20 2021-02-26 汪利峰 Diesel engine tail gas aftertreatment catalyst unit
CN111396178B (en) * 2020-03-31 2022-01-25 潍柴动力股份有限公司 Tail gas treatment device, control method and device thereof, and storage medium
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