CN107227994A - The coating processes of diesel exhaust filtration device and honeycomb substrate - Google Patents

The coating processes of diesel exhaust filtration device and honeycomb substrate Download PDF

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Publication number
CN107227994A
CN107227994A CN201610170447.2A CN201610170447A CN107227994A CN 107227994 A CN107227994 A CN 107227994A CN 201610170447 A CN201610170447 A CN 201610170447A CN 107227994 A CN107227994 A CN 107227994A
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Prior art keywords
ceramic
honeycomb
carrier
diesel exhaust
filtration device
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CN201610170447.2A
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Chinese (zh)
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华玉娣
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Individual
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Priority to CN201610170447.2A priority Critical patent/CN107227994A/en
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    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
    • C04B41/5031—Alumina
    • 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
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/2825—Ceramics
    • F01N3/2828—Ceramic multi-channel monoliths, e.g. honeycombs
    • 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
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/06—Ceramic, e.g. monoliths

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The present invention relates to a kind of diesel exhaust filtration device.It includes Rose Box（1）, Rose Box（1）It is interior that air-flow is provided with oxidation catalyst（2）And ceramic honeycomb carrier（3）, Rose Box（1）Inner surface be coated with silica heat insulating coat, oxidation catalyst（2）And ceramic honeycomb carrier（3）Outer surface be provided with heat-insulating and shock-absorbing layer（7）, the coating processes of honeycomb substrate are including Step 1: dispensing；Step 2: taking slurry；Step 3: coating；Step 4: firing.The coating processes of a kind of diesel exhaust filtration device of the present invention and honeycomb substrate, under ceramic honeycomb carrier and oxidation catalyst double-filtration, CO is reacted into by tail gas2、H2Micropore on O, next door can effectively filter the carbon soot particles in waste gas, and carbon soot particles can be burned off in the presence of catalyst coat；Coating processes are not only coated uniformly, and the slurry coated can be combined fully with ceramic monolith so that the good filtration effect of ceramic monolith.

Description

The coating processes of diesel exhaust filtration device and honeycomb substrate
Technical field
The present invention relates to a kind of diesel exhaust filtration device and the coating processes of honeycomb substrate, for purifying vehicle exhaust. Belong to automobile equipment technical field.
Background technology
At present, common diesel engine of vehicle exhaust gas filter, its discharge pollutant in containing soot particulate (PM), Hydro carbons (HC), CO and NOxDeng.Because O in tail gas2Content is higher, therefore HC and CO discharge capacitys are less, and the 1/ of general only gasoline engine 10, NOxDischarge capacity is roughly the same with gasoline engine, and PM discharge capacity is about tens times of gasoline engine, therefore existing diesel engine Exhaust gas filter can not effectively filter soot particulate, and the tail gas so discharged has a large amount of black smokes, causes environmental pollution.
Existing honeycomb substrate coating processes are, coating slurry is sprayed in ceramic monolith bottom up, and such a technique lacks Be trapped in：Slurry not only coats difficulty greatly in watery, and coating slurry can not fully be combined with carrier, the ceramics after coating Carrier unsightly, and poor filtration effect.
The content of the invention
It is an object of the invention to overcome above-mentioned deficiency, there is provided the painting of a kind of diesel exhaust filtration device and honeycomb substrate CO, HC, the NO of the coating processes of coating process, this diesel exhaust filtration device and honeycomb substrate in filtering vehicle exhaustxIt is harmful Also carbon soot particles can be filtered while gas, and carbon soot particles can progressively burn and aoxidize at high temperature, by diesel vehicle itself Temperature realizes the regeneration of ceramic honeycomb carrier；Coating processes are not only coated uniformly, and the slurry coated can fill with ceramic monolith Divide and combine so that the good filtration effect of ceramic monolith.
The object of the present invention is achieved like this：
A kind of diesel exhaust filtration device, including Rose Box, are characterized in：The inner surface of the Rose Box is coated with silica Heat insulating coat, the coating processes of the diesel exhaust filtration device and honeycomb substrate also include oxidation catalyst and ceramic honeycomb Carrier, the oxidation catalyst and ceramic honeycomb carrier are successively set in Rose Box along air-flow, the oxidation catalyst Heat-insulating and shock-absorbing layer is provided with the outer surface of ceramic honeycomb carrier, the ceramic honeycomb carrier is relative with the inwall of Rose Box Should, and ceramic honeycomb carrier is densely covered with stomata in the axial direction, one end of the stomata is opening, and the other end is provided with closure Face, the closure face and open space arrangement, the two neighboring stomata are provided with next door, next door and are provided with cellular micro- Catalyst coat is coated with hole, next door.
A kind of diesel exhaust filtration device of the present invention, the hole count of its stomata is 600 holes/square inch.
A kind of diesel exhaust filtration device of the present invention, the thickness in its next door is 0.13 ~ 0.14mm.
A kind of diesel exhaust filtration device of the present invention, its heat-insulating and shock-absorbing layer is made up of woven wire and ceramic fiber cloth, gold Category silk screen is arranged in ceramic fiber cloth, and woven wire is contacted with filtering chamber interior wall, ceramic fiber cloth and oxidation catalyst and Ceramic honeycomb carrier is contacted.
A kind of diesel exhaust filtration device of the present invention, its woven wire is stainless steel cloth or fine copper net, string diameter 0.12mm ~ 0.25mm, aperture 0.2mm ~ 0.42mm.
The coating processes of the honeycomb substrate of the present invention, are characterized in：The coating processes comprise the following steps：
Step 1: dispensing, activated alumina and platinum, rhodium, palladium precious metal solution are mixed 12 hours, obtain percetage by weight first 30-70% mixed solution, is then incorporated percetage by weight 25-60% rare earth, adds percetage by weight 1-5% activearm Point（Molecular sieve）, percetage by weight 1-5% high-molecular resin solution, percetage by weight 1-5% aluminium glue, percetage by weight 1- 5% rare earth nitrades, stir agglutination in 6 hours；Its middle rare earth is chloride oxygen scavenging material；Active component is high porosity Molecular sieve；High-molecular resin solution is poly-vinyl alcohol solution, and its water is 1 with material ratio：20；
Step 2: taking slurry, by calculating the area in honeycomb ceramic carrier next door, and then calculate gluey in required step one The weight of mixed liquor, then takes out quantitative gluey mixed liquor with container；
Step 3: coating, honeycomb ceramic carrier is placed in the top of a suction device, suction device and honeycomb ceramic carrier Bottom is close to, and the obtained slurry of step 3 is poured on into the top surface of honeycomb ceramic carrier, slurry jelly does not possess mobility, Positioned at the surface of honeycomb ceramic carrier, suction device is now opened, in the presence of suction device, gluey slurry is along honeycomb The next door of ceramic monolith is attracted to bottom surface from top surface；
Step 4: firing, the stove that the honeycomb ceramic carrier that step 4 is obtained is placed in into 550 DEG C is fired 3-5 hours.
Compared with prior art, the beneficial effects of the invention are as follows：
The coating processes of a kind of diesel exhaust filtration device of the present invention and honeycomb substrate, the tail gas in the presence of oxidation catalyst In harmful components HC, CO and soot particulate（PM）In organic matter enter oxidation catalyst carry out by-pass filtration, urging CO is oxidized under agent effect2And water, NO is then oxidized to the stronger NO of reducing property2, then in ceramic honeycomb carrier Under effect, the carbon soot particles in waste gas will be caught on next door by filtering, and in the presence of hot conditions catalyst coat, carbon Smoke particle can progressively be burnt and aoxidize, and the regeneration of ceramic honeycomb carrier is realized by diesel vehicle own temperature, is further increased Tail gas clean-up effect；The poly-vinyl alcohol solution as adhesive and the aluminium glue as adsorbent, therefore stirring are added in dispensing Jelly, and the suction device in matching step three can cause slurry to be applied since the top surface of ceramic monolith to mixed liquor afterwards Cover, with it is existing coat the technique of watery slurry since the ceramic monolith bottom compared with, slurry coating of the present invention is uniform, coating Slurry can be combined fully with ceramic monolith so that the good filtration effect of ceramic monolith.
Brief description of the drawings
Fig. 1 is a kind of structural representation of diesel exhaust filtration device of the invention.
Fig. 2 is the schematic cross-section of the ceramic honeycomb carrier of the present invention.
Fig. 3 is the partial axial section figure of the ceramic honeycomb carrier of the present invention.
Fig. 4 is the structural representation in the next door of the ceramic honeycomb carrier of the present invention.
In figure：
Rose Box 1,
Oxidation catalyst 2,
Ceramic honeycomb carrier 3,
Stomata 3.1,
Closure face 3.2,
Next door 3.3,
Micropore 3.4,
Catalyst coat 3.5
Opening 3.6,
Inlet exhaust gas 4,
Offgas outlet 5,
Tail gas 6,
Heat-insulating and shock-absorbing layer 7.
Embodiment
Referring to Fig. 1-4, the present invention relates to a kind of diesel exhaust filtration device, it includes Rose Box 1, oxidation catalyst 2 With ceramic honeycomb carrier 3, the left end of Rose Box 1 is inlet exhaust gas 4, and right-hand member is offgas outlet 5, the He of oxidation catalyst 2 Ceramic honeycomb carrier 3 is arranged in Rose Box 1, and ceramic honeycomb carrier 3 is at inlet exhaust gas 4, and oxidation catalyst 2 is close to tail At gas outlet 5, the Rose Box 1 is in tubular, and the ceramic honeycomb carrier 3 is corresponding with the inwall of Rose Box 1, and ceramic honeybee Nest carrier 3 is densely covered with stomata 3.1 in the axial direction, and one end of the stomata 3.1 is opening 3.6, and the other end is provided with closure face 3.2, the closure face 3.2 and the arranged for interval of opening 3.6, the two neighboring stomata 3.1 are provided with next door 3.3, next door 3.3 Be provided with is in be coated with catalyst coat 3.5 on cellular micropore 3.4, next door 3.3.
The inner surface of the Rose Box 1 is coated with silica heat insulating coat, diesel fuel filter is had heat-blocking action, can Temperature in diesel fuel filter is improved, improves catalyst effect.
The outer surface of the oxidation catalyst 2 and ceramic honeycomb carrier 3 is provided with heat-insulating and shock-absorbing layer 7, makes oxidized form The inwall of catalyst converter 2 and ceramic honeycomb carrier 3 and Rose Box 1 is Elastic Contact, it is possible to reduce expand with heat and contract with cold and oxidized form is catalyzed The influence of device 2 and the mechanical performance of ceramic honeycomb carrier 3, heat-insulating and shock-absorbing layer 7 is respectively in oxidation catalyst and particulate filter Two ends flanging, heat-insulating and shock-absorbing layer 7 is separately fixed in oxidation catalyst 2 and ceramic honeycomb carrier 3, heat-insulating and shock-absorbing layer 7 It is made up of woven wire and ceramic fiber cloth, woven wire is arranged in ceramic fiber cloth, woven wire connects with the inwall of Rose Box 1 Touch, ceramic fiber cloth is contacted with oxidation catalyst 2 and ceramic honeycomb carrier 3, woven wire be stainless steel cloth or fine copper net, String diameter 0.12mm ~ 0.25mm, aperture 0.2mm ~ 0.42mm.Composition is coated with ceramic fiber cloth for Al2O3:35% ~ 45%, SiO2: 44% ~ 54%, ZrO2:0% ~ 15%, thermal conductivity factor：About 0.08W/mk at 600 DEG C, thickness 0.5mm ~ 4mm.
Wherein, the hole count of stomata 3.1 is 600 holes/square inch, and the thickness in next door 3.3 is 0.13 ~ 0.14mm.
The coating processes of the honeycomb substrate of the present invention comprise the following steps：
Step 1: dispensing, activated alumina and platinum, rhodium, palladium precious metal solution are mixed 12 hours, obtain percetage by weight first 30-70% mixed solution, is then incorporated percetage by weight 25-60% rare earth, adds percetage by weight 1-5% activearm Point（Molecular sieve）, percetage by weight 1-5% high-molecular resin solution, percetage by weight 1-5% aluminium glue, percetage by weight 1- 5% rare earth nitrades, stir agglutination in 6 hours；Its middle rare earth is chloride oxygen scavenging material；Active component is high porosity Molecular sieve；High-molecular resin solution is poly-vinyl alcohol solution, and its water is 1 with material ratio：20.
Step 2: taking slurry, by calculating the area in honeycomb ceramic carrier next door, and then glue in required step one is calculated The weight of the mixed liquor of shape, then takes out quantitative gluey mixed liquor with container.
Step 3: coating, honeycomb ceramic carrier is placed in the top of a suction device, suction device is carried with ceramic honey comb The bottom of body is close to, and the obtained slurry of step 3 is poured on into the top surface of honeycomb ceramic carrier, and slurry jelly does not possess stream Dynamic property, positioned at the surface of honeycomb ceramic carrier, now opens suction device, in the presence of suction device, gluey slurry edge The next door for honeycomb ceramic carrier is attracted to bottom surface from top surface.
Step 4: firing, the stove that the honeycomb ceramic carrier that step 4 is obtained is placed in into 550 DEG C is fired 3-5 hours.
In step one, add after the poly-vinyl alcohol solution as adhesive and the aluminium glue as adsorbent, therefore stirring Mixed liquor jelly, and the suction device in matching step three can cause slurry to be coated since the top surface of ceramic monolith, With it is existing coat the technique of watery slurry since the ceramic monolith bottom compared with, slurry coating of the present invention is uniform, the slurry of coating Material can be combined fully with ceramic monolith so that the good filtration effect of ceramic monolith.
Operation principle：This diesel exhaust filtration device is connected with aiutage, when the engine operates, the tail of engine discharge Gas is by entering harmful components HC, CO and soot particulate in diesel exhaust filtration device, tail gas（PM）In organic matter enter Enter oxidation catalyst 2 and carry out by-pass filtration, CO is oxidized under catalyst action2And water, NO is then oxidized to reproducibility The stronger NO of energy2, enter ceramic honeycomb carrier 3 through inlet exhaust gas 4 from the tail gas of the exclusion of oxidation catalyst 2 and carry out two grades of mistakes Filter, tail gas enters from the opening 3.6 of stomata 3.1, because stomata 3.1 is opening 3.6 at one end, and is then closure face in the other end 3.2, therefore then waste gas can be discharged, due to carbon by the next door 3.3 with micropore 3.4 from the opening 3.6 of adjacent air holes 3.1 The diameter of smoke particle is big compared with micropore 3.4, therefore the carbon soot particles in waste gas will be caught on next door 3.3 by filtering, air-flow then from Micropore 3.4 is passed through.
Active rare earth of the catalyst coat 3.5 containing noble metal, Main Ingredients and Appearance has Pt, Pd, Rh, Al2O3、Ce、La、 Zr, Cu, Mn, the waste gas of diesel combustion（The predominantly pernicious gas such as CO, HC, NOx）During through micropore 3.4, next door is coated Catalyst coat 3.5 on 3.3 will strengthen CO, HC, NOxThe activity of three kinds of gas, promotes it to carry out certain oxidationreduction Reaction is learned, wherein CO is oxidized to colourless nontoxic carbon dioxide at high temperature, and HC compounds resolve into water at high temperature （H2O）And carbon dioxide, NOxIt is reduced into nitrogen and oxygen.
When diesel exhaust gas temperature reaches 375 degrees Celsius, in the presence of catalyst coat 3.5, on next door 3.3 Carbon soot particles can progressively burn and aoxidize, and the purifying rate of carbon soot particles about reaches more than 85%, when reaction temperature reaches that 500 take the photograph Catalyst and carbon soot particles reaction so as to burn completely when family name spends（Catalysis burning）, now the purifying rate of carbon soot particles is reachable More than 90%.

Claims (6)

1. a kind of diesel exhaust filtration device, including Rose Box（1）, it is characterised in that：The Rose Box（1）Inner surface coating There is silica heat insulating coat, the coating processes of the diesel exhaust filtration device and honeycomb substrate also include oxidation catalyst （2）And ceramic honeycomb carrier（3）, the oxidation catalyst（2）And ceramic honeycomb carrier（3）Filtering is successively set on along air-flow Case（1）It is interior, the oxidation catalyst（2）And ceramic honeycomb carrier（3）Outer surface be provided with heat-insulating and shock-absorbing layer（7）, institute State ceramic honeycomb carrier（3）With Rose Box（1）Inwall it is corresponding, and ceramic honeycomb carrier（3）Gas is densely covered with the axial direction Hole（3.1）, the stomata（3.1）One end be opening（3.6）, the other end is provided with closure face（3.2）, the closure face （3.2）And opening（3.6）Arranged for interval, the two neighboring stomata（3.1）It is provided with next door（3.3）, next door（3.3）On be provided with In cellular micropore（3.4）, next door（3.3）On be coated with catalyst coat（3.5）.
2. a kind of diesel exhaust filtration device according to claim 1, it is characterised in that：The stomata（3.1）Hole count For 600 holes/square inch.
3. a kind of diesel exhaust filtration device according to claim 1 or 2, it is characterised in that：The next door（3.3）Thickness Spend for 0.13 ~ 0.14mm.
4. a kind of diesel exhaust filtration device according to claim 1, it is characterised in that：The heat-insulating and shock-absorbing layer（7）By Woven wire and ceramic fiber cloth composition, woven wire are arranged in ceramic fiber cloth, woven wire and Rose Box（1）Inwall connects Touch, ceramic fiber cloth and oxidation catalyst（2）And ceramic honeycomb carrier（3）Contact.
5. a kind of diesel exhaust filtration device according to claim 4, it is characterised in that：The woven wire is stainless steel Silk screen or fine copper net, string diameter 0.12mm ~ 0.25mm, aperture 0.2mm ~ 0.42mm.
6. a kind of coating processes of the honeycomb substrate of diesel exhaust filtration device, it is characterised in that：The coating processes include with Lower step：
Step 1: dispensing, activated alumina and platinum, rhodium, palladium precious metal solution are mixed 12 hours, obtain percetage by weight first 30-70% mixed solution, is then incorporated percetage by weight 25-60% rare earth, adds percetage by weight 1-5% activearm Point（Molecular sieve）, percetage by weight 1-5% high-molecular resin solution, percetage by weight 1-5% aluminium glue, percetage by weight 1- 5% rare earth nitrades, stir agglutination in 6 hours；Its middle rare earth is chloride oxygen scavenging material；Active component is high porosity Molecular sieve；High-molecular resin solution is poly-vinyl alcohol solution, and its water is 1 with material ratio：20；
Step 2: taking slurry, by calculating the area in honeycomb ceramic carrier next door, and then calculate gluey in required step one The weight of mixed liquor, then takes out quantitative gluey mixed liquor with container；
Step 3: coating, honeycomb ceramic carrier is placed in the top of a suction device, suction device and honeycomb ceramic carrier Bottom is close to, and the obtained slurry of step 3 is poured on into the top surface of honeycomb ceramic carrier, slurry jelly does not possess mobility, Positioned at the surface of honeycomb ceramic carrier, suction device is now opened, in the presence of suction device, gluey slurry is along honeycomb The next door of ceramic monolith is attracted to bottom surface from top surface；
Step 4: firing, the stove that the honeycomb ceramic carrier that step 4 is obtained is placed in into 550 DEG C is fired 3-5 hours.
CN201610170447.2A 2016-03-24 2016-03-24 The coating processes of diesel exhaust filtration device and honeycomb substrate Pending CN107227994A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN201610170447.2A CN107227994A (en) 2016-03-24 2016-03-24 The coating processes of diesel exhaust filtration device and honeycomb substrate

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CN107227994A true CN107227994A (en) 2017-10-03

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114029068A (en) * 2021-12-03 2022-02-11 华设设计集团环境科技有限公司 Catalyst for cooperative control of nitrogen oxides and particulate matters in diesel engine tail gas and preparation method and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114029068A (en) * 2021-12-03 2022-02-11 华设设计集团环境科技有限公司 Catalyst for cooperative control of nitrogen oxides and particulate matters in diesel engine tail gas and preparation method and application thereof

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Application publication date: 20171003