CN113912411A - Cordierite thermal shock-resistant thin-wall catalyst carrier and preparation method thereof - Google Patents
Cordierite thermal shock-resistant thin-wall catalyst carrier and preparation method thereof Download PDFInfo
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- CN113912411A CN113912411A CN202111106866.7A CN202111106866A CN113912411A CN 113912411 A CN113912411 A CN 113912411A CN 202111106866 A CN202111106866 A CN 202111106866A CN 113912411 A CN113912411 A CN 113912411A
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- cordierite
- catalyst carrier
- equal
- thermal shock
- resistant thin
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- 229910052878 cordierite Inorganic materials 0.000 title claims abstract description 70
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000003054 catalyst Substances 0.000 title claims abstract description 62
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 26
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
Abstract
The invention discloses a cordierite thermal shock resistant thin-wall catalyst carrier and a preparation method thereof, which are mainly used for the aftertreatment of diesel engine tail gas. The CTE of the catalyst carrier can reach less than or equal to 0.2 multiplied by 10 under the condition of proper condition control‑6The temperature is RT-800 ℃, and the thermal shock resistance temperature reaches more than 750 ℃; the thin-wall catalyst carrier with low thermal expansion coefficient, thermal shock resistance and proper pore size distribution is prepared by optimizing the grain composition of raw materials, adding a proper pore-forming agent and adjusting a sintering process, and can ensure that the thin-wall catalyst carrier has low thermal capacity, low back pressure and good coating performance.
Description
Technical Field
The invention relates to the field of cordierite honeycomb ceramic materials, in particular to a cordierite thermal shock-resistant thin-wall catalyst carrier and a preparation method thereof.
Background
The pollution of the engine is mainly from 4 components-particulate emissions (PM), Hydrocarbons (HC), nitrogen oxides (NOx) and carbon monoxide (CO). Wherein the particulate emissions (soot) consist mostly of carbon or carbide micro-particles (size less than 4-20 μm).
As the living environment of human beings is seriously polluted by the exhaust emission of diesel vehicles, the method brings great harm to human beings. Through epidemic and pathological investigation, carbon monoxide (CO), Hydrocarbon (HC) and amorphous nitrogen oxide (NOx) in tail gas components damage brain nerves of a human body, a mild poisoning person feels dizziness and vomit, and a severe poisoning person harms normal work of the brain central nervous system of the human body and seriously affects physical and psychological health of the human body; in addition, the tail gas particles discharged by the diesel vehicle have great relation with the lung cancer, and the particles discharged by the tail gas of the diesel vehicle with the diameter ranging from 0.1 to 10 microns are proved to have serious toxicity to the respiratory system of human beings.
Therefore, the technical problem to be solved by the technical staff in the field is how to provide a cordierite thermal shock resistant thin-walled catalyst carrier with good economic benefit and simple process and a preparation method thereof, and the obtained catalyst carrier can meet the requirements of the national six standards on the catalyst carrier for the after-treatment of the diesel engine.
Disclosure of Invention
In view of the above, the invention provides a high thermal shock thin-wall cordierite catalyst carrier and a preparation method thereof, the invention can reduce the sintering temperature and adjust the pore size distribution by introducing cordierite powder, and can effectively reduce the thermal expansion coefficient of cordierite and improve the thermal shock resistance of the product by introducing superfine alumina, gamma-alumina and boehmite; can prepare the cordierite sintered body with a honeycomb structure, low thermal expansion coefficient, thermal shock resistance, thin wall thickness, good mechanical strength, proper porosity and pore size distribution.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cordierite thermal shock resistant thin-wall catalyst carrier is prepared by preparing raw materials comprising a main material and an auxiliary material;
wherein, the main materials comprise: 37-43 wt% of talc, 12-40 wt% of kaolin, 0.1-30 wt% of alumina, 3-21 wt% of silicon oxide and 0.01-5 wt% of cordierite powder;
the auxiliary materials comprise the following components in parts by weight of 100 percent of the main materials: 0-5 wt% of dispersing agent, 0-10 wt% of extrusion auxiliary agent, 0-10 wt% of adhesive and plastic agent, 0-20 wt% of pore-forming agent and 20-26 wt% of water.
Preferably, in the main material, the median particle size of each raw material is as follows: 25 mu m of talc is more than or equal to D50 and more than or equal to 5 mu m, 7 mu m of alumina is more than or equal to D50 and more than or equal to 0.1 mu m, 15 mu m of silica is more than or equal to D50 and more than or equal to 1 mu m, 10 mu m of kaolin is more than or equal to D50 and more than or equal to 0.1 mu m, 25 mu m of cordierite powder is more than or equal to D50 and more than or equal to 1 mu m.
Preferably, the talc is a platelet structure having an iron oxide content of not more than 2.5 wt%.
Preferably, the kaolin is one or more of calcined kaolin and raw kaolin;
the alumina is one or more of alpha-alumina, gamma-alumina and boehmite;
the silicon oxide is one or a mixture of spherical silicon oxide and fused silicon oxide.
More preferably, the boehmite is a sheet structure.
Preferably, the cordierite in the cordierite powder has a chemical composition of MgO: 12.5-14.5 wt% of Al2O3：33-37wt％、SiO2: 48-52 wt%, and the crystal phase composition of the cordierite is more than or equal to 95%.
Preferably, the dispersant is oleic acid or/and stearic acid;
the extrusion auxiliary agent is one or a mixture of oleic acid, lauric acid, glycerol, linseed oil and rapeseed oil.
Preferably, the plasticizer is one or more of cellulose, polyethylene glycol, polyethylene oxide and polyvinyl alcohol;
the pore-forming agent is one or a mixture of more of graphite, cellulose, potato starch and corn starch.
The invention also aims to provide a preparation method of the micro-cordierite gasoline engine particulate trap, which is characterized by comprising the following steps:
(1) weighing the raw materials according to the proportion for later use;
(2) mixing talc, kaolin, alumina, silicon oxide and cordierite powder, and stirring at a rotating speed of 15-80r/min for 15-60min to obtain a mixed material A;
(3) adding a plastic agent and a pore-forming agent into the mixed material A, and stirring at the rotating speed of 15-80r/min for 15-60min to obtain a mixed material B;
(4) adding water, a dispersing agent, an adhesive and an extrusion auxiliary agent into the mixed material B, and stirring at the rotating speed of 15-80r/min for 30-90min to obtain pug;
(5) pugging the pug, removing impurities, and then performing extrusion forming by using a corresponding die to obtain a honeycomb ceramic blank;
(6) drying the honeycomb ceramic blank at 50-80 ℃, and then sintering to obtain cordierite honeycomb ceramic;
(7) and carrying out pore-plugging skin grafting on the cordierite honeycomb ceramic to obtain the catalyst carrier.
Preferably, the temperature setting of the sintering comprises: firstly, heating to 100-180 ℃ from room temperature at a speed of less than 30 ℃/h; then heating to 600-1000 ℃ at a speed of less than 50 ℃/h, and preserving heat for 0.1-12 h; finally, heating to 1320-1435 ℃ at a speed of less than 50 ℃/h, and preserving heat for 2-24 h; stopping heating after the highest temperature heat preservation is finished, and cooling along with the furnace; the total sintering time is 60-150 h.
Preferably, the prepared particle catcher has the pore density of 46.5-116.25 pores/cm2(300-750 CPSI); the thickness of the hole wall is 0.05-0.12 mm; the pore diameter of the wall surface micropores is 1-10 mu m; the median pore diameter is 1-30 μm; the average pore diameter is 1-10 μm;
more preferably, the prepared particle catcher has a pore density of 62 pores/cm2(ii) a The hole wall thickness was 0.1 mm.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the thermal shock resistant thin-walled cordierite catalyst carrier has the advantages of low cost, simple process and the like, the preparation of the cordierite with low thermal expansion coefficient is realized, and the prepared thin-walled cordierite catalyst carrier has excellent thermal shock resistance, can be used for a thin-walled catalyst carrier and can meet the requirement of the national six standards on the catalyst carrier for the post-treatment of a diesel engine;
the thin-wall catalyst carrier with low thermal expansion coefficient, thermal shock resistance and proper pore size distribution is prepared by optimizing the grain composition of raw materials, adding proper pore-forming agent and adjusting the sintering process; the thin-wall catalyst carrier has better extrusion molding performance, and can ensure that the thin-wall catalyst carrier has lower heat capacity, lower back pressure and better coating performance;
the thermal expansion coefficient of the cordierite thermal shock resistant thin-wall catalyst carrier finally prepared by the invention is less than or equal to 0.5 multiplied by 10-6/° c (RT-800 ℃); not more than 0.7 multiplied by 10 from room temperature to 1000 DEG C-6/° c; the thermal shock resistance temperature is more than or equal to 750 ℃; under the condition of proper control, the CTE can reach less than or equal to 0.2 multiplied by 10-6/. degree.C. (RT-800 ℃ C.). More than 80% of pores are distributed in the range of 2-20 mu m in diameter, and the porosity is 30-39%; the compressive strength in the channel direction is more than 6.0Mpa, and the compressive strength in the direction vertical to the channel direction is more than or equal to 1.0 Mpa.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for preparing a cordierite thermal shock resistant thin-walled catalyst support according to the present invention;
FIG. 2 is a schematic structural view of a cordierite thermal shock resistant thin-walled catalyst support of the present invention;
FIG. 3 is a schematic end view of a cordierite thermal shock resistant thin walled catalyst support of the present invention;
wherein, 1 is the wall surface of the carrier, 2 is the through hole of the carrier, and 3 is the outer skin of the carrier;
FIG. 4 is a scanning electron micrograph of a cordierite thermal shock resistant thin-walled catalyst support of the present invention magnified 100 times;
FIG. 5 is a scanning electron micrograph of a cordierite thermal shock resistant thin-walled catalyst support of the present invention magnified 5000 times;
FIG. 6 is an XRD pattern of a cordierite thermal shock resistant thin wall catalyst support of the present invention;
FIG. 7 is a graph of the thermal expansion of a cordierite thermal shock resistant thin wall catalyst support of the present invention from room temperature to 800 ℃ corresponding to a coefficient of thermal expansion of 1: 0.1746X 10-6℃-1，2：0.1270×10-6℃-1；
FIG. 8 is a graph showing the relationship between the number of catalyst carriers and the wall thickness and back pressure;
FIG. 9 is a comparison graph of parameters of honeycomb ceramics with different mesh and wall thickness.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a cordierite thermal shock resistant thin-wall catalyst carrier, and the preparation raw materials of the catalyst comprise main materials and auxiliary materials;
wherein, the major ingredient includes: 37-43 wt% of talc, 12-40 wt% of kaolin, 0.1-30 wt% of alumina, 3-21 wt% of silicon oxide and 0.01-5 wt% of cordierite powder;
the auxiliary materials comprise the following components in parts by weight based on 100 wt% of the main materials: 0-5 wt% of dispersing agent, 0-10 wt% of extrusion auxiliary agent, 0-10 wt% of adhesive and plastic agent, 0-20 wt% of pore-forming agent and 20-26 wt% of water.
In order to further optimize the technical scheme, the median particle size of each raw material in the main material is as follows: 25 mu m of talc is more than or equal to D50 and more than or equal to 5 mu m, 7 mu m of alumina is more than or equal to D50 and more than or equal to 0.1 mu m, 15 mu m of silica is more than or equal to D50 and more than or equal to 1 mu m, 10 mu m of kaolin is more than or equal to D50 and more than or equal to 0.1 mu m, 25 mu m of cordierite powder is more than or equal to D50 and more than or equal to 1 mu m.
In order to further optimize the above technical solution, the talc is a plate-like structure with an iron oxide content not exceeding 2.5 wt%.
In order to further optimize the technical scheme, the kaolin is one or a mixture of calcined kaolin and raw kaolin;
the alumina is one or more of alpha-alumina, gamma-alumina and boehmite;
the silicon oxide is one or the mixture of spherical silicon oxide and fused silicon oxide.
In order to further optimize the technical scheme, the cordierite in the cordierite powder has a chemical composition of MgO: 12.5-14.5 wt% of Al2O3：33-37wt％、SiO2: 48-52 wt%, and the crystal phase composition of the cordierite is more than or equal to 95%.
In order to further optimize the technical scheme, the dispersant is oleic acid or/and stearic acid;
the extrusion auxiliary agent is one or more of oleic acid, lauric acid, glycerol, linseed oil and rapeseed oil.
In order to further optimize the technical scheme, the plasticizer is one or a mixture of more of cellulose, polyethylene glycol, polyethylene oxide and polyvinyl alcohol;
the pore-forming agent is one or more of graphite, cellulose, potato starch and corn starch.
Example 1
A cordierite thermal shock resistant thin-wall catalyst carrier, the preparation raw material of the cordierite catalyst carrier comprises main material and auxiliary material;
wherein, the major ingredient includes: talc 1: 40.58 wt%, kaolin 1: 20.14 wt%, kaolin 2: 16.11 wt%, alumina 1: 18.13 wt%, alumina 2: 0 wt%, silicon oxide 1: 5.04 wt%
The auxiliary materials comprise the following components in parts by weight based on 100 wt% of the main materials: 4.0 wt% of plasticizer, 1: 0.25 wt%, adhesive 2: 0.2 wt%, dispersant: 3.0 wt%, pore-forming agent 1: 3.0 wt%, pore-forming agent 2: 0 wt%, water: 24 wt%, extrusion aid: 1.0 wt%.
Table 1 shows the kinds and the corresponding proportions of the raw materials for preparing the cordierite thermal shock resistant thin-walled catalyst carriers of examples 2 to 13 (based on 100 wt% of the main material, the percentage of each auxiliary material is the proportion of the main material)
| Name of raw materials | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 |
| Alumina 1 | 18.13 | 18.13 | 6.92 | 10.84 | 15.55 | 18.13 | 18.13 | 6.92 | 10.84 | 15.55 | 0 | 14.92 |
| Aluminum oxide 2 | 0 | 0 | 12.83 | 14.08 | 14.98 | 0 | 0 | 12.83 | 14.08 | 14.98 | 26.46 | 10.95 |
| Kaolin 1 | 16.11 | 16.11 | 15.79 | 10.83 | 6.91 | 16.11 | 16.11 | 15.79 | 10.83 | 6.91 | 3.88 | 3.88 |
| Kaolin 2 | 20.14 | 20.14 | 19.74 | 13 | 4.61 | 20.14 | 20.14 | 19.74 | 13 | 4.61 | 15.43 | 15.42 |
| Silicon oxide 1 | 5.04 | 5.04 | 4.94 | 0 | 0 | 5.04 | 5.04 | 4.94 | 0 | 0 | 14.53 | 14.53 |
| Silicon oxide 2 | 0 | 0 | 0 | 10.84 | 17.28 | 0 | 0 | 0 | 10.84 | 17.28 | 0 | 0 |
| Talc 1 | 0 | 20.14 | 39.78 | 40.41 | 40.67 | 0 | 20.14 | 19.78 | 20.41 | 20.67 | 19.6 | 0 |
| Talc 2 | 40.58 | 20.44 | 0 | 0 | 0 | 40.58 | 20.44 | 20 | 20 | 20 | 19.6 | 39.8 |
| Cordierite powder | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.5 | 0.5 |
| Dispersing agent | 1 | 1 | 1 | 3 | 3 | 3 | 5 | 5 | 5 | 1 | 1 | 1 |
| Plastic agent 1 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2.99 | 3 | 2.98 |
| Plasticizer 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Extrusion aid | 0.97 | 0.97 | 0.97 | 0.97 | 0.97 | 1.5 | 2.5 | 1 | 1..5 | 3 | 1.5 | 3 |
| Adhesive 1 | 0.2 | 0.2 | 0.2 | 0.2 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.7 | 0.7 | 0.7 |
| Adhesive 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Adhesive 3 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.3 | 0.3 | 0.3 | 0.2 | 0.2 | 0.2 |
| Pore-forming agent 1 | 3 | 3 | 3 | 3 | 3 | 3 | 0 | 0 | 0 | 0 | 0 | 5 |
| Pore-forming agent 2 | 0 | 0 | 0 | 0 | 0 | 0 | 5 | 0 | 5 | 5 | 0 | |
| Ceramic material | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
Example 14
Step 101: weighing talc, kaolin, alumina, silica and cordierite according to the proportion of the embodiment 1-13 for later use;
step 102: adding the plastic agent and the pore-forming agent which are weighed according to the proportion in the embodiment 1, and stirring at the rotating speed of 15-80r/min for 15-60 min;
step 103: adding water and extrusion aid weighed according to the proportion in the example 1, and stirring at the rotating speed of 15-80r/min for 30-90 min: obtaining pug with better plasticity;
step 104: putting the pug obtained in the step 103 into a vacuum pug mill for vacuum pugging and removing impurities twice; extruding and molding by using an extruder to obtain a honeycomb ceramic blank;
step 105: drying the extruded ceramic blank at 50-80 ℃ by using electromagnetic radiation equipment to obtain a dried ceramic blank;
step 106: placing the dried honeycomb ceramic body into sintering equipment for sintering, and discharging to obtain a cordierite thermal shock-resistant thin-wall catalyst carrier semi-finished product;
step 107: machining and skin grafting the semi-finished product obtained in the step 106 to obtain a finished product of the cordierite thermal shock-resistant thin-wall catalyst carrier;
wherein, the sintering process is as follows: 1. heating from room temperature to 220 ℃ at a heating rate of 12 ℃/h; 2. raising the temperature to 600 ℃ at a temperature rise rate of 15 ℃/h; 3. heating to 950 ℃ at the speed of 25 ℃/h, and keeping the temperature for 5 h; 4. heating to 1430 ℃ at the speed of 25 ℃/h, and keeping the temperature for 12 h; 5. and finally, cooling along with the furnace.
Example 15
The preparation method is the same as example 2, except that the sintering process is as follows: heating from room temperature to 100 ℃ at a heating rate of 25 ℃/h; 2. rising to 250 ℃ at the heating rate of 3 ℃/h; 3. heating to 950 ℃ at the speed of 30 ℃/h, and preserving heat for 5 h; 4. heating to 1425 ℃ at the speed of 30 ℃/h, and keeping the temperature for 9 h; 5. and finally, cooling along with the furnace.
Example 16
The preparation method is the same as example 2, except that the sintering process is as follows: the preparation method is the same as that of example 14, except that the sintering process is as follows: heating from room temperature to 180 ℃ at a heating rate of 5 ℃/h; 2. raising the temperature to 300 ℃ at a heating rate of 3 ℃/h; 3. heating to 950 ℃ at the speed of 30 ℃/h, and preserving heat for 6 h; 4. heating to 1415 ℃ at a speed of 25 ℃/h, and keeping the temperature for 12 h; 5. and finally, cooling along with the furnace.
Example 17
Referring to fig. 8 and 9, the invention relates to a honeycomb ceramic catalyst carrier for catalytic purification of diesel exhaust used in the development of diesel exhaust after-treatment industry, which is mainly used for meeting the requirement of diesel exhaust after-treatment of VI in the country, and the technical route of the six diesel vehicles in the country is mainly DOC + CDPF + SCR, wherein the DPF uses cordierite DPF and silicon carbide DPF, but the requirements of the six country on DOC \ SCR carrier are far higher than the catalyst carrier required in the fifth stage in the country at present, so that the cordierite thin-wall catalyst carrier required by the six country is developed. The cordierite catalyst carrier required by the national six has higher requirement on back pressure, so that the proper mesh number and wall thickness of the carrier become the key point of the development of the national six catalyst carrier, and the national six catalyst carrier proposed by the mainstream catalyst company and the main engine plant at present requires 400 meshes/4 Mil (about 0.10mm) in wall thickness;
from FIGS. 8 and 9, it can be found that, in the case of the cordierite catalyst carrier having a wall thickness of 6.5Mil, which is currently used in the fifth country, the end surface open area ratio of 4.3Mil is approximately 8% higher than that of 6.5Mil, and the specific gravity is 0.13g/cm lighter than that of the cordierite catalyst carrier having a wall thickness of 4.3Mil of 400 mesh, as compared with the six country use catalyst carrier having the same wall thickness of 4.3Mil of 400 mesh3The thermal capacity is reduced by 21 percent, the backpressure loss is reduced by 19 percent, and the 400-mesh 4.3Mil specification has great advantages in the end face open area ratio, the specific gravity, the thermal capacity and the backpressure loss compared with the 600-mesh 4.3Mil wall thickness and the 400-mesh 4.3Mil specification cordierite catalyst carrier, so the thin-wall cordierite catalyst carrier has great necessity.
As the market demands of the catalyst carrier at home and abroad are in the early stages of initiation and outbreak, and the developed cordierite SCR can reach the international advanced level, the catalyst carrier has wide application prospect in the aspect of treating the polluted air discharged by the tail gas of the urban diesel vehicles/gasoline vehicles, accords with the municipal air governing policy proposed by the government of China, and makes a contribution to the urban environmental protection treatment due to the successful research and development of the catalyst carrier.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A cordierite thermal shock resistant thin-wall catalyst carrier is characterized in that the preparation raw materials of the catalyst carrier comprise main materials and auxiliary materials;
wherein, the main materials comprise: 37-43 wt% of talc, 12-40 wt% of kaolin, 0.1-30 wt% of alumina, 3-21 wt% of silicon oxide and 0.01-5 wt% of cordierite powder;
the auxiliary materials comprise the following components in parts by weight of 100 percent of the main materials: 0-5 wt% of dispersing agent, 0-10 wt% of extrusion auxiliary agent, 0-10 wt% of adhesive and plastic agent, 0-20 wt% of pore-forming agent and 20-26 wt% of water.
2. The cordierite thermal shock resistant thin-walled catalyst carrier of claim 1, wherein the median particle diameter of each raw material in the main material is: 25 mu m of talc is more than or equal to D50 and more than or equal to 5 mu m, 7 mu m of alumina is more than or equal to D50 and more than or equal to 0.1 mu m, 15 mu m of silica is more than or equal to D50 and more than or equal to 1 mu m, 10 mu m of kaolin is more than or equal to D50 and more than or equal to 0.1 mu m, 25 mu m of cordierite powder is more than or equal to D50 and more than or equal to 1 mu m.
3. The cordierite thermal shock resistant thin walled catalyst support of claim 1 wherein the talc is a platelet structure having an iron oxide content of no more than 2.5 wt%.
4. The cordierite thermal shock resistant thin walled catalyst support of claim 1 wherein the kaolin is one or a mixture of calcined kaolin and raw kaolin;
the alumina is one or more of alpha-alumina, gamma-alumina and boehmite;
the silicon oxide is one or a mixture of spherical silicon oxide and fused silicon oxide.
5. The cordierite thermal shock resistant thin walled catalyst support of claim 1The cordierite powder is characterized in that the chemical composition of cordierite in the cordierite powder is MgO: 12.5-14.5 wt% of Al2O3：33-37wt％、SiO2: 48-52 wt%, and the crystal phase composition of the cordierite is more than or equal to 95%.
6. The cordierite thermal shock resistant thin-walled catalyst support of claim 1 wherein the dispersant is oleic acid or/and stearic acid;
the extrusion auxiliary agent is one or a mixture of oleic acid, lauric acid, glycerol, linseed oil and rapeseed oil.
7. The cordierite thermal shock resistant thin-walled catalyst carrier of claim 1 wherein the plasticizer is one or more of cellulose, polyethylene glycol, polyethylene oxide and polyvinyl alcohol;
the pore-forming agent is one or a mixture of more of graphite, cellulose, potato starch and corn starch.
8. The preparation method of the micro cordierite gasoline engine particulate trap is characterized by comprising the following steps:
(1) weighing the raw materials according to the proportion of the raw materials in any one of claims 1 to 7 for later use;
(2) mixing talc, kaolin, alumina, silicon oxide and cordierite powder, and stirring at a rotating speed of 15-80r/min for 15-60min to obtain a mixed material A;
(3) adding a plastic agent and a pore-forming agent into the mixed material A, and stirring at the rotating speed of 15-80r/min for 15-60min to obtain a mixed material B;
(4) adding water, a dispersing agent, an adhesive and an extrusion auxiliary agent into the mixed material B, and stirring at the rotating speed of 15-80r/min for 30-90min to obtain pug;
(5) pugging the pug, removing impurities, and then performing extrusion forming by using a corresponding die to obtain a honeycomb ceramic blank;
(6) drying the honeycomb ceramic blank at 50-80 ℃, and then sintering to obtain cordierite honeycomb ceramic;
(7) and carrying out pore-plugging skin grafting on the cordierite honeycomb ceramic to obtain the catalyst carrier.
9. The method of claim 8, wherein the sintering temperature setting comprises: firstly, heating to 100-180 ℃ from room temperature at a speed of less than 30 ℃/h; then heating to 600-1000 ℃ at a speed of less than 50 ℃/h, and preserving heat for 0.1-12 h; finally, heating to 1320-1435 ℃ at a speed of less than 50 ℃/h, and preserving heat for 2-24 h; stopping heating after the highest temperature heat preservation is finished, and cooling along with the furnace; the total sintering time is 60-150 h.
10. The method for preparing a cordierite thermal shock resistant thin-walled catalyst carrier according to claim 8, wherein the prepared catalyst carrier has a pore density of 46.5-116.25 pores/cm2(ii) a The thickness of the hole wall is 0.05-0.12 mm; the pore diameter of the wall surface micropores is 1-10 mu m; the median pore diameter is 1-30 μm; the average pore diameter is 1 to 10 μm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114588900A (en) * | 2022-02-19 | 2022-06-07 | 中自环保科技股份有限公司 | Gasoline engine particle trapping catalyst and preparation method thereof |
| CN115819108A (en) * | 2023-02-14 | 2023-03-21 | 山东奥福环保科技股份有限公司 | High-strength high-porosity honeycomb ceramic carrier and preparation method thereof |
| CN116063095A (en) * | 2023-03-06 | 2023-05-05 | 山东奥福环保科技股份有限公司 | Thin-wall cordierite honeycomb ceramic filter with large median pore diameter and preparation method and application thereof |
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| CN115819108A (en) * | 2023-02-14 | 2023-03-21 | 山东奥福环保科技股份有限公司 | High-strength high-porosity honeycomb ceramic carrier and preparation method thereof |
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Application publication date: 20220111 |