CN103041873A - Catalytic combustion catalyst and preparation method thereof - Google Patents
Catalytic combustion catalyst and preparation method thereof Download PDFInfo
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- CN103041873A CN103041873A CN2011103138359A CN201110313835A CN103041873A CN 103041873 A CN103041873 A CN 103041873A CN 2011103138359 A CN2011103138359 A CN 2011103138359A CN 201110313835 A CN201110313835 A CN 201110313835A CN 103041873 A CN103041873 A CN 103041873A
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Abstract
The invention discloses a catalytic combustion catalyst and a preparation method thereof. The catalyst uses honeycomb ceramic as a supporter, and an aluminasol coating and a slurry coating are sequentially arranged on the surface of the honeycomb ceramic supporter; the aluminasol coating is positioned between the ceramic supporter and the slurry coating; Pt, Zr and La metal element active components are supported on the surface of the slurry coating; the Pt/Zr/La mol ratio is (0.1-1):(1.5-4.5):(1.5-4); and every liter of catalyst supports 0.2-3.5g of noble metal Pt active component. The preparation method of the catalytic combustion catalyst comprises the following steps: supporter pretreatment, aluminasol preparation, coating slurry preparation, sol application of supporter, slurry application, and metal active component supporting. The catalytic combustion catalyst has the advantages of long service time, high removal rate and the like in the catalytic combustion process of treating organic waste gas, thereby ensuring the long-term stable operation of the catalytic combustion device.
Description
Technical field
The present invention relates to a kind of catalyst for catalytic combustion and preparation method thereof, relate in particular to catalyst for catalytic combustion of a kind of high life and stability and preparation method thereof.
Background technology
Volatile organic matter (VOCs) results from petroleum refining industry and electronics, printing, coating, paint process industry.The organic exhaust gas of a large amount of dischargings is contaminated environment not only, also the serious harm mankind's health.Along with the raising of people's living standard, also more and more higher to the requirement of living environment, effective processing of this kind gas has caused people's extensive concern.In the technology of processing VOCs, Production by Catalytic Combustion Process has efficiently, the characteristics of low temperature, obtains more and more general application.In order to guarantee the circulation of waste gas, reduce droop loss, catalytic combustion mostly adopts the resistant to elevated temperatures loaded catalyst of porous, and this catalyst generally passes through at the porous carrier face coat, the then method of load active component preparation.
CN88100589 discloses a kind of catalyst for purifying exhaust air, the honeycomb support and the coating that is deposited on the honeycomb support that comprise en-block construction, this coating is to form with a kind of carbon monoxide-olefin polymeric that contains with the refractory inorganic oxide of average particulate diameter in 0.5 to 20 micrometer range, has platinum and/or palladium and the rhodium that deposits with high concentration at refractory inorganic oxide.This kind catalyst is to apply the carrier that honeycomb support and calcining apply by the moisture thin pulp that employing contains carbon monoxide-olefin polymeric to produce.CN1415410A discloses a kind of catalyst for catalytic combustion and preparation method thereof.Solved the problem that the noble metal component utilization rate of catalyst for catalytic combustion is low in the prior art, dispersion is inhomogeneous.It is active component that this catalyst adopts precious metals pt, and the mode by the organic acid competitive Adsorption is distributed in the honeycomb ceramic carrier surface, and wherein the noble metal loading is every liter of 0.5～4gPt, carrier coating consist of active A l
2O
320%～80%, TiO
210%～40%, CeO
25%～30%, ZrO
25%～20%.CN1488435 discloses a kind of catalyst for catalytic combustion for the organic waste-gas purification processing, is comprised of the honeycomb ceramic carrier skeleton of bulk and coating and the noble metal active component that applies on it.The coating of catalyst is by Al
2O
3, SiO
2Form with the common composite oxides that form of one or more alkaline earth oxides.
Above-described organic waste gas catalytic combustion catalyst mostly adopts the method preparation of honeycomb substrate, slurry coating and noble metal dipping, noble metal has active high advantage as the catalyst for catalytic combustion of active component, and common organic exhaust gas is had very high clearance.It is worth noting that coating is the important part of catalyst, above-mentioned catalyst is owing to the problem of amount and bond strength on the coating, and existence and stability is poor, the shortcoming that the life-span is short, anti-wear performance is poor.Along with the variation of upstream device operating mode, the composition of gas speed, tolerance and gas all can have fluctuation, and good coating provides large specific area when need to have good anti-wear performance, thereby guarantees that emission-control equipment has stable and long-term high clearance.Therefore, it is significant to develop the catalyst for catalytic combustion that has high bond strength and anti-wear performance coating.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of catalyst for catalytic combustion and preparation method thereof, this catalyst has the advantages such as long-life and high clearance in the catalyticing combustion process of processing organic exhaust gas, thereby guarantees catalytic combustion system operation steady in a long-term.
A kind of catalyst for catalytic combustion, take ceramic honey comb as carrier, the honeycomb ceramic carrier surface has aluminium collosol coating and slurry coating successively, the aluminium collosol coating is between ceramic monolith and slurry coating, at the slurry coating area load Pt, Zr, La metallic element active component are arranged, Pt, Zr, La metallic element mol ratio are 0.1～1:1.5～4.5:1.5～4, and the loading of precious metals pt active component is every liter of catalyst 0.2～3.5g.
Generally to select cordierite be that raw material is made to honeycomb ceramic carrier among the present invention.By the gross weight of slurry coating, contain 40%～80% Al in the slurry coating
2O
3, 2%～15% titanium dioxide, all the other components are the oxide of cerium, zirconium, lanthanum, copper and manganese, the metal molar ratio is: Ce:Zr:La:Cu:Mn=1.5～4.5:1～2.5:1～2.5:0.1～1.The aluminium collosol coating adopts self-control colloidal sol, has high-adhesion and good dispersiveness.
A kind of preparation method of catalyst for catalytic combustion comprises the process for preparation of carrier preprocessing process, aluminium colloidal sol process for preparation, slurry coating, aluminium colloidal sol coating procedure, slurries coating procedure and the metal active constituent loading process of carrier.
It is to soak 1～6 hour in 0.5%～2% the watery hydrochloric acid that honeycomb ceramic carrier preprocessing process described in the inventive method at first is positioned over honeycomb substrate mass concentration, place supersonic cleaning machine to clean 0.5～4 hour in carrier and liquid, under 60 ℃～150 ℃, dried by the fire 0.5～6 hour after taking out; Carrier after the oven dry obtained cleaning dry carrier again in roasting 4-6 hour.
Aluminium colloidal sol layoutprocedure described in the inventive method, at first configuration quality concentration is 3%～6% cmc soln, collocation method can be taked the method for substep dissolving, can accelerate dissolution velocity by the method for heating; Boehmite is joined in the cmc soln, when stirring, drip red fuming nitric acid (RFNA).After stirring certain hour, be heated to 70-90 ℃, continue to drip nitric acid to complete peptization, the control pH is 1 ~ 5, ageing 20-30 hour, obtains milky aluminium colloidal sol.
The process for preparation of the slurry coating described in the inventive method, example takes by weighing boehmite, cerium Zirconium oxide or nitrate, lanthanum nitrate, nano-TiO in molar ratio
2, aluminum nitrate, manganese nitrate and copper nitrate put into tank, ball milling becomes uniform slurries; Slurries behind the taking-up ball milling add red fuming nitric acid (RFNA) and stirring, leave standstill, and make the coating slurries.Ball-milling Time is 2～16 hours, preferred 4～8 hours.Spheroid in the ball grinder is 0.3～2.2 with the slurry weight ratio.Mixing time is 2～16 hours, preferred 4～8 hours, and 500～800 rev/mins of mixing speeds, time of repose is 1～2 hour.
Aluminium colloidal sol coating procedure described in the inventive method places aluminium colloidal sol to take out after 5～60 minutes in pretreated carrier, blow liquid in the space with compressed air, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting is 3～16 hours under air ambient, namely makes the honeycomb type ceramic monolith with aluminium collosol coating.
Slurries coating procedure described in the inventive method places the coating slurries to take out after 5～60 minutes in the carrier of coated with aluminum colloidal sol, blow liquid in the space with compressed air, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting obtained having the honeycomb ceramic carrier of high-specific surface area and bond strength in 3～16 hours under air ambient.
It is 0.5～2% Pt, Zr and the nitrate solution of La that the carrier of active constituent loading process described in the inventive method after with coating places metallic element quality percentage composition, Pt, Zr, La metallic element mol ratio are 0.1～1:1.5～4.5:1.5～4 in the solution, stop after 3～60 minutes and take out, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting is 3～16 hours under air ambient, makes catalyst for catalytic combustion.
Compared with prior art, the present invention has following advantage:
1, the prepared catalyst for catalytic combustion of the inventive method has aluminium collosol coating and slurry coating successively on the honeycomb ceramic carrier surface, aluminium collosol coating and honeycomb ceramic carrier and slurry coating have well is combined effect, connection function by the aluminium collosol coating, avoided in the prior art slurry coating adhesive force weak, come off easily, deficiencies such as amount is low on the coating, make catalyst for catalytic combustion under the various working condition, all have long-life and high-activity stable;
2, employed self-control aluminium colloidal sol has very high adhesion among the present invention, can further improve the bond strength between cordierite carrier and the coating, prevent to cause the situation of coating shedding to occur owing to the acute variation of operating mode tolerance, gas speed or gas temperature, in addition, the raising of slurry coating bond strength can greatly improve the wear-corrosion resistance of catalyst, thereby improves service life;
3, among the present invention employed slurry coating have very high specific area and and the active force of aluminium collosol coating strong, further improved it and applied recruitment, the BET area can reach 25 m
2About/g, the raising of specific area is conducive to the dispersion of reactive metal, thereby being implemented in the low-metal content situation, to be issued to higher VOC be clearance, in addition, because slurry coating has very high coating recruitment, the primary coating weightening finish can reach about 9%, thereby has guaranteed the anti-wear performance under the gentle speed of high tolerance, the service life of improving catalyst;
4, added dispersing agent C MC(carboxymethyl cellulose in the employed aluminium colloidal sol preparation process among the present invention), guaranteed that the colloidal sol of preparation can be dispersed in the cordierite carrier surface uniformly, and preparation process is not introduced Cl
-Plasma prevents from catalyst activity is had a negative impact;
5, catalyst for catalytic combustion of the present invention can efficiently be processed the VOCs waste gas of Various Complex to the processing strong adaptability of VOCs waste gas, and preparation method and equipment are simple, easy operating and suitability for industrialized production.
The specific embodiment
Further specify effect of the present invention and effect below in conjunction with embodiment, but described embodiment should not be construed as the restriction of the scope of the invention.
Embodiment 1
Be that to put into mass concentration be that 1% watery hydrochloric acid soaks 2h for 70% honeycomb ceramic carrier with porosity, with carrier and diluted acid liquid after cleaning 2h under the microwave, dry up after the taking-up, and placing 100 ℃ baking oven 6 hours, it is for subsequent use that the carrier roasting of gained was obtained cleaning dry honeycomb type ceramic monolith in 5 hours;
Employing method of fractional steps preparation mass concentration is 3% cmc soln, and solution temperature is 40 ℃.Get 10g boehmite (Shandong Aluminum Co., Ltd.) and join in the above-mentioned institute of the 100mL cmc soln, and add while stirring the 6g red fuming nitric acid (RFNA) with 300 rev/mins.Heated solution to 80 ℃ continues to drip nitric acid to complete glue solution, and control pH value is 1～5, and ageing 24 hours obtains milky aluminium colloidal sol;
Take by weighing boehmite 46g, cerium oxide 10g, zirconia 8g, lanthanum nitrate 21g, nano-TiO
25g, copper nitrate 2g, manganese nitrate 2.8g and aluminum nitrate 2.7g are dissolved in the 100g deionized water, stir a little in the rear immigration ball grinder with glass bar, behind the ball milling 5 hours, the slurries that obtain are poured into add while stirring red fuming nitric acid (RFNA) 0.3ml in the beaker, mixing speed is 600 rev/mins, mixing time is 4 hours, leaves standstill 2 hours, and it is for subsequent use to make the coating slurries;
Pretreated honeycomb ceramic carrier is put into aluminium colloidal sol dipping 15 minutes, dry up after the taking-up, and place 110 ℃ baking oven 4 hours, put into again 500 ℃ baking oven roasting 12 hours, obtain having the carrier of even aluminium collosol coating; Above-mentioned carrier is put into the coating slurries, apply slurry coating on aluminium collosol coating surface, operating process is identical with the preparation process of aluminium collosol coating with condition;
Take distilled water as solvent, 1:4:4 adds Pt (NO by metal element mol ratio
3)
4Powder, Zr (NO
3)
4Powder, La (NO
3)
3.6H
2The O crystalline particle, preparing metal element quality percentage composition is 1.2% composite reactive component nitrate solution, the carrier that has applied coating is put into this solution dipping to be taken out after 10 minutes, place 160 ℃ baking oven 6 hours, catalyst for catalytic combustion was namely made in roasting in 5 hours again, and wherein the loading of Pt is every liter of catalyst 1.0g.
Embodiment 2
The carrier preprocessing process is with embodiment 1, and difference is that concentration of nitric acid is 0.5%, and soak time is 2 hours;
Aluminium colloidal sol preparation method is with embodiment 1, and difference is that boehmite is 12.5g, and slowly adds the 7.2g red fuming nitric acid (RFNA) when stirring with 350 rev/mins of speed;
Take by weighing boehmite 22g, cerous nitrate 7.5g, zirconium nitrate 8.2g, lanthanum nitrate 26.6g, nano-TiO
20.8g, copper nitrate 0.8g, manganese nitrate 1.2g and aluminum nitrate 3g be dissolved in the 100g deionized water, stir a little in the rear immigration ball grinder with glass bar, behind the ball milling 4 hours, the slurries that obtain are poured into add while stirring red fuming nitric acid (RFNA) 0.6ml in the beaker, mixing speed is 800 rev/mins, and mixing time is 6 hours, leave standstill and add 4g urea and strong stirring 40min after 2 hours, 800 rev/mins of mixing speeds, 30 ℃ of temperature, it is for subsequent use to make the coating slurries;
The coating procedure of aluminium colloidal sol and slurries is with embodiment 1;
The reactive metal dipping process is with embodiment 1.The loading of Pt is every liter of catalyst 1.0g.
Embodiment 3
The carrier preprocessing process is with embodiment 1, and difference is that dip time is 6 hours, and drying time is 4 hours, and bake out temperature is 60 ℃;
Aluminium colloidal sol preparation method is with embodiment 1, and difference is that cmc soln concentration is 6%, and speed of agitator is 450 rev/mins;
The layoutprocedure of coating slurries is with embodiment 1;
The coating procedure of aluminium colloidal sol and slurries is with embodiment 1;
Take distilled water as solvent, 1:2:4 adds Pt (NO in molar ratio
3)
4Powder, Zr (NO
3)
4Powder, La (NO
3)
3.6H
2The O crystalline particle, preparing metal element quality percentage composition is 0.8% composite reactive component nitrate solution, the carrier that has applied coating is put into this solution dipping to be taken out after 30 minutes, place 70 ℃ baking oven 6 hours, catalyst for catalytic combustion was namely made in roasting in 5 hours again, and wherein the loading of Pt is every liter of catalyst 0.8g.
Embodiment 4
The carrier preprocessing process is with embodiment 3;
The same embodiment of aluminium colloidal sol preparation method;
The layoutprocedure of coating slurries is with embodiment 1;
The coating procedure of carrier aluminum colloidal sol and slurry coating is with embodiment 1;
The reactive metal dipping process is with embodiment 1, and wherein the loading of Pt is every liter of catalyst 1.2g.
Comparative example 1
Press the method for CN1488435, measuring 100mL concentration is 50gAl
2O
3The Al(NO of/100mL solution
3)
3The aqueous solution under agitation slowly adds 20%(V/V) weak aqua ammonia to pH=7.0, adding 2mL concentration is 50gAl
2O
3The Al(NO of/100mL solution
3)
3The aqueous solution continued to stir after 10 minutes, and adding 133mL concentration is 30gSiO
2The Ludox of/100mL solution adds the Mg(NO that 100mL concentration is 10gMgO/100mL solution again
3)
2The aqueous solution, adding water purification to moisture thin pulp cumulative volume is 1000mL, is stirred to evenly, with the coating liquid of this moisture thin pulp as honeycomb ceramic carrier coating;
Pretreated honeycomb ceramic carrier among the embodiment 1 is immersed in the above-mentioned moisture thin pulp, submergence was taken out after 10 minutes, removed residual slurries in the hole with compressed air, and then 60 ℃ of dryings 15 hours in the air, 550 ℃ of roastings are 2 hours in the air, namely get the cated honeycomb ceramic carrier of tool;
Compound concentration is the H of 0.4Pt/100mL solution
2PtCl
6Aqueous solution 1000mL floods night as the noble metal active component, to apply cated honeycomb ceramic carrier and in this maceration extract, flood taking-up after 20 minutes, blow away raffinate in the hole with compressed air, and then 120 ℃ of dryings 10 hours in the air, 500 ℃ of roastings are 5 hours in the air, namely get catalyst for catalytic combustion, wherein the loading of active component Pt is every liter of catalyst 1.2g.
Comparative example 2
The carrier preprocessing process is with embodiment 1;
Take by weighing boehmite 22g, cerous nitrate 7.5g, zirconium nitrate 8.2g, lanthanum nitrate 26.6g, nano-TiO
20.8g, copper nitrate 0.8g, manganese nitrate 1.2g and aluminum nitrate 3g be dissolved in the 100g deionized water, stir a little in the rear immigration ball grinder with glass bar, behind the ball milling 4 hours, the slurries that obtain are poured into add while stirring red fuming nitric acid (RFNA) 0.6ml in the beaker, mixing speed is 800 rev/mins, and mixing time is 6 hours, leave standstill and add 4g urea and strong stirring 40min after 2 hours, 800 rev/mins of mixing speeds, 30 ℃ of temperature are made coating slurries (identical with the slurry coating of embodiment 1) for subsequent use;
Pretreated honeycomb ceramic carrier is put into coating slurries dippings 15 minutes, dry up after the taking-up, and place 110 ℃ baking oven 4 hours, put into again 500 ℃ baking oven roasting 12 hours, the carrier that obtains having the homogeneous slurry coating;
The reactive metal dipping process is with embodiment 1.The loading of Pt is every liter of catalyst 1.2g.
Investigate catalyst coat of the present invention in conjunction with firm degree, specific area and coating recruitment, following experiment is set.
Experiment 1:
Sample was put into the microwave oscillation cleaning machine 5 hours, weigh before and after the concussion, investigate the coating of sample in conjunction with firm degree, data see Table 1:
Table 1 support samples microwave oscillation data
| Test number | Coated carrier weight (g) | Weight behind the microwave oscillation (g) | Loss of weight is than (%) |
| Embodiment 1 | 14.271 | 14.071 | 1.401 |
| Embodiment 2 | 14.464 | 14.268 | 1.355 |
| Embodiment 3 | 13.164 | 12.998 | 1.261 |
| Embodiment 4 | 13.763 | 13.569 | 1.410 |
| Comparative example 1 | 13.726 | 13.362 | 2.652 |
| Comparative example 2 | 14.912 | 14.612 | 2.012 |
Annotate: loss of weight ratio=(weight after coated carrier weight-concussion)/coated carrier weight * 100%, in order to guarantee to calculate accurately the loss of weight ratio, the selection weighing precision is that the electronic balance of 0.001g carries out weighing
Can be found out that by above data the support samples expulsion rate of embodiment 1～4 is lower, illustrate that this patent has good coating firmness, and the aluminium collosol coating is to the raising successful of figure layer bond strength.
Experiment 2:
The BET specific area of analytic sample the results are shown in Table 2:
Table 2 support samples specific surface test data
| Numbering | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Comparative example 1 | Comparative example 2 |
| BET area (m 2/g） | 24.21 | 21.25 | 26.84 | 24.16 | 11.15 | 16.22 |
Can be found out that by above data the support samples specific area of embodiment 1～4 is apparently higher than Comparative Examples 1.
Experiment 3:
The record carrier sample applies the weight after front and the roasting, sees Table 3:
Table 3 support samples weightening finish ratio
| Test number | The former weight of carrier (g) | Weight (g) after the carrier coating roasting | Weightening finish is than (%) |
| Embodiment 1 | 24.48 | 26.63 | 8.78 |
| Embodiment 2 | 23.61 | 25.35 | 7.37 |
| Embodiment 3 | 24.28 | 26.69 | 9.93 |
| Embodiment 4 | 24.16 | 26.19 | 8.40 |
| Comparative example 1 | 23.76 | 24.46 | 2.95 |
| Comparative example 2 | 23.12 | 24.23 | 4.80 |
Annotate: weightening finish ratio=(weight after the roasting-carrier original weight)/carrier original weight * 100%
Can be found out that by above data the support samples coating solid increment of embodiment 1～4 is more than 7%.
Life-span and the capacity of resisting impact load of examination catalyst of the present invention arrange following experiment.
Experiment 4:
To contain the multi-component organic exhaust gas such as benzene, toluene embodiment 1, comparative example 1 and comparative example 2 prepared catalyst are carried out laboratory evaluation, the total hydrocarbon concentration of waste gas is 3000mg/m
3, reaction velocity is 20000h
-1, 300 ℃ of bed inlet temperatures.The 500h evaluation result sees Table 4; Adjusting reaction velocity is 10000
-1～50000h
-1, 300 ℃ of bed inlet temperatures, evaluation result sees Table 5; Air speed is 20000h
-1, the bed inlet temperature is adjusted into 420 ℃, and the 500h evaluation result sees Table 6:
Table 4 catalyst life evaluation experimental data record
| Catalyst | The 100h clearance, % | The 200h clearance, % | The 500h clearance, % |
| Embodiment 1 | 99. 62 | 99.37 | 99.33 |
| Comparative example 1 | 98.54 | 96.12 | 94.71 |
| Comparative example 2 | 98.19 | 96.63 | 95.84 |
Table 5 catalyst air speed tolerance evaluation experimental data record
| Catalyst | 10000h -1The air speed clearance, % | 20000h -1The air speed clearance, % | 50000h -1The air speed clearance, % |
| Embodiment 1 | 99.85 | 99.62 | 99.51 |
| Comparative example 1 | 99. 76 | 98.54 | 88.49 |
| Comparative example 2 | 99. 84 | 98.19 | 90.11 |
Table 6 catalyst high temperature tolerance evaluation experimental record data
| Catalyst | Embodiment 1 | Comparative example 1 | Comparative example 2 |
| 100 hours clearances, % | 99.96 | 97.43 | 98.82 |
| 200 hours clearances, % | 99.93 | 93.16 | 95.64 |
| 500 hours clearances, % | 98.75 | 90.59 | 92.13 |
Can be found out that by table 4, table 5 and table 6 catalyst has preferably active and higher organic removal rate, and gentle speed fluctuation there is good adaptive capacity to temperature.
Claims (10)
1. catalyst for catalytic combustion, it is characterized in that: this catalysis is take ceramic honey comb as carrier, the honeycomb ceramic carrier surface has aluminium collosol coating and slurry coating successively, the aluminium collosol coating is between ceramic monolith and slurry coating, at the slurry coating area load Pt, Zr, La metallic element active component are arranged, Pt, Zr, La metallic element mol ratio are 0.1～1:1.5～4.5:1.5～4, and the loading of precious metals pt active component is every liter of catalyst 0.2～3.5g.
2. catalyst according to claim 1 is characterized in that: by the gross weight of slurry coating, contain 40%～80% Al in the described slurry coating
2O
3, 2%～15% titanium dioxide, all the other components are the oxide of cerium, zirconium, lanthanum, copper and manganese, the metal molar ratio is: Ce:Zr:La:Cu:Mn=1.5～4.5:1～2.5:1～2.5:0.1～1.
3. the preparation method of the described catalyst for catalytic combustion of claim 1, it is characterized in that: the method comprises the process for preparation of carrier preprocessing process, aluminium colloidal sol process for preparation, slurry coating, aluminium colloidal sol coating procedure, slurries coating procedure and the metal active constituent loading process of carrier.
4. method according to claim 3, it is characterized in that: it is to soak 1～6 hour in 0.5%～2% the watery hydrochloric acid that described honeycomb ceramic carrier preprocessing process at first is positioned over honeycomb substrate mass concentration, place supersonic cleaning machine to clean 0.5～4 hour in carrier and liquid, under 60 ℃～150 ℃, dried by the fire 0.5～6 hour after taking out; Carrier after oven dry roasting 4-6 hour again.
5. method according to claim 3 is characterized in that: described aluminium colloidal sol layoutprocedure at first configuration quality concentration is 3%～6% cmc soln; Boehmite is joined in the cmc soln, drip nitric acid to complete peptization, the control pH is 1 ~ 5, and collosol temperature is 70-90 ℃, ageing 20-30 hour.
6. method according to claim 3, it is characterized in that: the process for preparation of described coating slurries is as follows: example takes by weighing boehmite, cerium Zirconium oxide or nitrate, lanthanum nitrate, nano-TiO in molar ratio
2, aluminum nitrate, manganese nitrate and copper nitrate put into tank, ball milling becomes uniform slurries; Slurries behind the taking-up ball milling add red fuming nitric acid (RFNA) and also stir, leave standstill.
7. according to claim 3 or 6 described methods, it is characterized in that: Ball-milling Time is 2～16 hours, and the spheroid in the ball grinder is 0.3～2.2 with the slurry weight ratio, and mixing time is 2～16 hours, 500～800 rev/mins of mixing speeds, time of repose are 1～2 hour.
8. method according to claim 3, it is characterized in that: described carrier coating process places aluminium colloidal sol to take out after 5～60 minutes in pretreated carrier, blow liquid in the space with compressed air, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting was 3～16 hours under air ambient.
9. according to claim 3 or 8 described methods, it is characterized in that: place slurry coating to take out after 5～60 minutes the honeycomb type ceramic monolith of coated with aluminum collosol coating, blow liquid in the space with compressed air, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting was 3～16 hours under air ambient.
10. method according to claim 3, it is characterized in that: it is 0.5～2% Pt, Zr and the nitrate solution of La that the carrier of described active constituent loading process after with coating places metallic element quality percentage composition, Pt, Zr, La metallic element mol ratio are 0.1～1:1.5～4.5:1.5～4 in the solution, stop after 3～60 minutes and take out, 60 ℃～160 ℃ lower oven dry 3～16 hours, roasting was 3～16 hours under air ambient.
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| CN105709854A (en) * | 2014-12-05 | 2016-06-29 | 中国石油化工股份有限公司 | Metal-matrix catalytic combustion catalyst and preparation method thereof |
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| CN114251158A (en) * | 2020-09-24 | 2022-03-29 | 广东加南环保生物科技有限公司 | Diesel exhaust particulate matter catalytic filter and method for manufacturing same |
| CN114251158B (en) * | 2020-09-24 | 2022-09-16 | 广东加南环保生物科技有限公司 | Diesel exhaust particulate matter catalytic filter and method for manufacturing same |
| CN112138658A (en) * | 2020-09-30 | 2020-12-29 | 南京工程学院 | Preparation method of integral catalyst for tank tail gas purification |
| CN112138658B (en) * | 2020-09-30 | 2023-09-15 | 南京工程学院 | Preparation method of integral catalyst for purifying tank tail gas |
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| CN116060018A (en) * | 2023-02-10 | 2023-05-05 | 河南工业大学 | Nickel-based catalyst for catalytic combustion of VOCs gas and preparation method thereof |
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