CN107899570A - Integral catalyzer for super low concentration methyl hydride combustion and preparation method thereof - Google Patents
Integral catalyzer for super low concentration methyl hydride combustion and preparation method thereof Download PDFInfo
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- CN107899570A CN107899570A CN201711216857.7A CN201711216857A CN107899570A CN 107899570 A CN107899570 A CN 107899570A CN 201711216857 A CN201711216857 A CN 201711216857A CN 107899570 A CN107899570 A CN 107899570A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000009841 combustion method Methods 0.000 title abstract description 3
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 25
- 238000000576 coating method Methods 0.000 claims abstract description 25
- 239000000919 ceramic Substances 0.000 claims abstract description 21
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 19
- 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 group [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 claims abstract description 19
- 229910000510 noble metal Inorganic materials 0.000 claims abstract description 13
- 229910052763 palladium Inorganic materials 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 21
- 229910003158 γ-Al2O3 Inorganic materials 0.000 claims description 18
- 229910002666 PdCl2 Inorganic materials 0.000 claims description 16
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 238000003760 magnetic stirring Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 7
- 239000003643 water by type Substances 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 4
- 101150003085 Pdcl gene Proteins 0.000 claims description 4
- 229910001593 boehmite Inorganic materials 0.000 claims description 4
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 4
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000010970 precious metal Substances 0.000 claims description 4
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 230000000873 masking effect Effects 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 238000007598 dipping method Methods 0.000 claims description 2
- 239000003054 catalyst Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 15
- 239000003245 coal Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000007084 catalytic combustion reaction Methods 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- PIBWKRNGBLPSSY-UHFFFAOYSA-L palladium(II) chloride Chemical compound Cl[Pd]Cl PIBWKRNGBLPSSY-UHFFFAOYSA-L 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Catalysts (AREA)
Abstract
The present invention relates to a kind of catalyst, in particular to a kind of integral catalyzer for super low concentration methyl hydride combustion and preparation method thereof.Wherein integral catalyzer includes carrier, coating and noble metal, and the carrier is cordierite honeycomb ceramic, its specific surface area is 0.81m2/ g, aperture 3mm；The coating is γ Al2O3Tie coat, Al in the tie coat2O3Mass percentage be 5% 10%, the noble metal be that the mass percentage of palladium Pd, the Pd are 0.1% 2%.The preparation method of the catalyst is simple, the ignition temperature of methane can be reduced to 450 550 DEG C, and conversion ratio can reach more than 90%；In addition the γ Al that prepared by the present invention2O3Coating adhesion is preferable, not easily to fall off, and coating is more smooth on cordierite honeycomb ceramic, and has preferable load effect to Pd.
Description
Technical field
The present invention relates to a kind of catalyst, is urged in particular to a kind of monoblock type for super low concentration methyl hydride combustion
Agent and preparation method thereof.
Background technology
Coal mine methane refers to the coal mine gas that methane concentration is less than 0.75%, in coal production process, has a large amount of coals
Ore deposit idle air excludes, but since the methane concentration of coal mine methane is low, Collection utilization is very difficult, for a long time, most coals
Ore deposit idle air does not take any measure, is just directly discharged in air, not only causes greenhouse effects, also creates mass energy
Waste.
In recent years, as national energy-saving emission reduction policy requirements, coal mine methane have obtained preferable processing.Its main processing
Technology is hot counter-current catalytic combustion technology, however using above-mentioned technology coal mine methane is handled when, it is necessary to catalyst carry out
It is combustion-supporting, improve the thermal efficiency of methane.Show according to the study, 1% methane be less than for the methane of super low concentration, especially concentration,
Precious metals pd shows higher activity, but the technology is due to the use of porous thermal storage ceramic, in actual operation, often
The monoblock type fine catalyst of rule is easily broken up by air-flow and blocks duct, the efficiency of combustion of the coal mine methane seriously affected.
In existing integral catalyzer preparation process, the preparation and coating of collosol coating and the load of noble metal are catalysis
Difficult point prepared by agent.Collosol concentration is too thick, easily blocks the duct of honeycomb ceramic carrier, collosol concentration is too low, and caking property is not
It is good, cause coating easily to come off；The mode of loading of noble metal has an effect on the generation and arrangement of crystalline form, so as to influence catalyst
Activity.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide a kind of monoblock type catalysis for super low concentration methyl hydride combustion
Agent and preparation method thereof.
To achieve the above object, the present invention uses following technical scheme：
A kind of integral catalyzer for super low concentration methyl hydride combustion, including carrier, coating and noble metal, the carrier
For cordierite honeycomb ceramic, its specific surface area is 0.81m2/ g, aperture 3mm；The coating is γ-Al2O3Tie coat, institute
Al in the tie coat stated2O3Mass percentage be 5%-10%, the noble metal is the quality hundred of palladium Pd, the Pd
It is 0.1%-2% to divide content.
A kind of preparation method of integral catalyzer for super low concentration methyl hydride combustion is：
Step 1：Cordierite honeycomb ceramic is cleaned with deionized water, the dust in its surface and hole is removed, dries in the air naturally
It is put into after dry in baking oven and dries 2h in 110 DEG C, it is 8%-10%'s that the cordierite honeycomb ceramic after drying, which is placed in equipped with concentration,
Soaked in salpeter solution beaker, until being completely immersed in, then beaker is sealed with masking foil, stands 1.5h- at normal temperatures
2h, takes out cordierite honeycomb ceramic, and is cleaned with deionized water, is placed again into after naturally dry in baking oven in 120 DEG C of drying
3h, is then placed in Muffle furnace again, calcines 2h in 450 DEG C, obtains the cordierite honeycomb ceramic of preliminary treatment, i.e. cord；
Step 2：Boehmite dry glue powder is placed in beaker, deionized water is added, then it is adjusted with nitric acid
Section, 3-4 is adjusted to by pH value, after stirring 15min with glass bar, obtains Aluminum sol, then the poly- second two of 1ml is added into Aluminum sol
Beaker, is then placed on magnetic stirring apparatus by alcohol, and design temperature is 15-20 DEG C, high-speed stirred 2h, after standing, obtains γ-Al2O3
Colloidal sol；
Step 3：The cord obtained in step 1 is fixed with thin wire, and is at the uniform velocity vertically put into what step 2 obtained
γ-Al2O3In colloidal sol, it is submerged completely, after standing 20min-30min, cord is at the uniform velocity pulled out, blows off what is blocked in hole
Aluminum sol, stands dry at room temperature, be placed in baking oven, 3h-4h is dried at 120 DEG C, then by the cord after drying
It is placed in Muffle furnace, the calcination 3h at 400 DEG C -550 DEG C；γ-the Al that step 2 obtains are placed into after taking-up2O3In colloidal sol, make
It is submerged completely, after standing 20min-30min, cord is at the uniform velocity pulled out, blows off the Aluminum sol blocked in hole, at room temperature
Standing is dried, and is placed in baking oven, and 3h-4h is dried at 120 DEG C, and then the cord after drying is placed in Muffle furnace,
Calcination 3h at 400 DEG C -550 DEG C, so repeats 3-5 times, that is, γ-Al is made2O3γ-the Al that coating rate is about 5%-10%2O3/
cord；
Step 4：γ-the Al that will be obtained in step 32O3γ-the Al that coating rate is about 5%-10%2O3/ cordd is placed in
PdCl2In dilute solution, and it is heated, until PdCl2After dilute solution is evaporated completely, γ-Al are taken out2O3/ cord,
Liquid Residue is blown out, is placed in air and naturally dries to two γ-Al2O3Do not bonded mutually between/cord, be then placed on baking oven
In, in 100 DEG C of -120 DEG C of drying 2h, by the γ-Al after drying2O3/ cord is placed in the hydrazine hydrate that concentration is 1%, to your gold
Category Pd carries out reduction dipping reductase 12 h and obtains the integral catalyzer of the present invention for super low concentration methyl hydride combustion,
That is Pd- γ-Al2O3/cord。
Further, the PdCl2The preparation method of dilute solution is：
Weigh in the balance and take PdCl2Solid is put into beaker, adds 100ml ultra-pure waters, instills concentrated hydrochloric acid, wherein PdCl2's
Weight and the volume ratio of concentrated hydrochloric acid are 1:2, beaker is placed on magnetic stirring apparatus after being stirred evenly with glass bar, temperature setting
For 50 DEG C, at the uniform velocity stir, until solid is completely dissolved, PdCl is so made2Solution.
The invention has the advantages that：The integral catalyzer Pd prepared in the present invention is complete in carrier surface crystalline form
It is whole, it is evenly distributed, preparation process is simple, and noble metal dosage is few, is especially less than 1% methane to concentration to super low concentration methane
There is preferable catalytic activity, greatly reduce the temperature of methane catalytic combustion, to the methane that concentration is 0.5%, the catalyst energy
The ignition temperature of methane is reduced to 450-550 DEG C, and conversion ratio can reach more than 90%；In addition the γ that prepared by the present invention-
Al2O3Coating adhesion is preferable, not easily to fall off, and coating is more smooth on cordierite honeycomb ceramic, and has to Pd preferable negative
Carry effect.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical solution in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work,
Belong to the scope of protection of the invention.
Embodiment one
A kind of integral catalyzer for super low concentration methyl hydride combustion, including carrier, coating and noble metal, the carrier
For cordierite honeycomb ceramic, its specific surface area is 0.81m2/ g, aperture 3mm；The coating is γ-Al2O3Tie coat, institute
Al in the tie coat stated2O3Mass percentage be 5%-10%, the noble metal is the quality hundred of palladium Pd, the Pd
It is 2% to divide content.
A kind of preparation method of integral catalyzer for super low concentration methyl hydride combustion is：
Step 1：Cordierite honeycomb ceramic is cleaned with deionized water, the dust in its surface and hole is removed, dries in the air naturally
It is put into after dry in baking oven and dries 2h in 110 DEG C, the cordierite honeycomb ceramic after drying is placed in equipped with the nitric acid that concentration is 10%
Soaked in solution beaker, until being completely immersed in, then sealed beaker with masking foil, when standing 2 is small at normal temperatures, taken
Go out cordierite honeycomb ceramic, and cleaned with deionized water, is placed again into after naturally dry in baking oven when 120 DEG C of drying 3 are small,
Then it is placed in again in Muffle furnace, when 450 DEG C of calcinings 2 are small, obtains the cordierite honeycomb ceramic of preliminary treatment, i.e. cord；
Step 2：10g boehmite dry glue powders are placed in beaker, 100ml deionized waters are added, then with 5ml nitre
Acid is adjusted, and pH value is adjusted to 3.8, after stirring 15min with glass bar, obtains Aluminum sol, then add into Aluminum sol
Enter 1ml polyethylene glycol, then beaker is placed on magnetic stirring apparatus, design temperature is 20 DEG C, high-speed stirred 2h, after standing, is obtained
To γ-Al2O3Colloidal sol, its colloid solid content are 10%；
Step 3：The cord obtained in step 1 is fixed with thin wire, and is at the uniform velocity vertically put into what step 2 obtained
γ-Al2O3In colloidal sol, it is submerged completely, after standing 20min, cord is at the uniform velocity pulled out, it is molten to blow off the aluminium blocked in hole
Glue, stands dry at room temperature, be placed in baking oven, 3h is dried at 120 DEG C, the cord after drying then is placed in horse
Not in stove, the calcination 3h at 550 DEG C；γ-the Al that step 2 obtains are placed into after taking-up2O3In colloidal sol, it is set to be submerged completely,
After standing 20min, cord is at the uniform velocity pulled out, blows off the Aluminum sol blocked in hole, stood dry at room temperature, be placed on baking
In case, 3h is dried at 120 DEG C, then the cord after drying is placed in Muffle furnace, the calcination 3h at 550 DEG C, so repeatedly 4
It is secondary, that is, γ-Al are made2O3γ-the Al that coating rate is about 7.1%2O3/cord；
Step 4：Weigh in the balance and take PdCl2Solid 1g is some in beaker, adds 100ml ultra-pure waters, instills the dense salt of 2ml
Beaker, is placed on magnetic stirring apparatus by acid after being stirred evenly with glass bar, and temperature is set as 50 DEG C, at the uniform velocity stirs, until solid
It is completely dissolved, PdCl is so made2Solution；
Then γ-the Al that will be obtained in step 32O3γ-the Al that coating rate is about 7.1%2O3/ cord is placed in PdCl2Dilution
In solution, and it is heated, until PdCl2After dilute solution is evaporated completely, γ-Al are taken out2O3/ cord, blowout residual
Liquid, is placed in air and naturally dries to two γ-Al2O3Do not bond mutually, be then placed in baking oven, in 120 between/cord
DEG C drying 2h, by the γ-Al after drying2O3/ cord is placed in the hydrazine hydrate that concentration is 1%, and reduction leaching is carried out to precious metals pd
Stain reductase 12 h obtains the integral catalyzer of the present invention for super low concentration methyl hydride combustion, i.e. Pd- γ-Al2O3/
The mass percentage of cord, its Pd are 2%.
Embodiment two
A kind of integral catalyzer for super low concentration methyl hydride combustion, including carrier, coating and noble metal, the carrier
For cordierite honeycomb ceramic, its specific surface area is 0.81m2/ g, aperture 3mm；The coating is γ-Al2O3Tie coat, institute
Al in the tie coat stated2O3Mass percentage be 5%-10%, the noble metal is the quality hundred of palladium Pd, the Pd
It is 0.5% to divide content；Its preparation method is as follows：
Step 1：It is identical with the method for embodiment one；
Step 2：8g boehmite dry glue powders are placed in beaker, 100ml deionized waters is added, then uses 3.5ml
Nitric acid is adjusted, and pH value is adjusted to 3.5, after stirring 15min with glass bar, obtains Aluminum sol, then into Aluminum sol
1ml polyethylene glycol is added, then beaker is placed on magnetic stirring apparatus, design temperature is 20 DEG C, high-speed stirred 2h, after standing,
Obtain γ-Al2O3Colloidal sol, its colloid solid content are 8%；
Step 3：The cord obtained in step 1 is fixed with thin wire, and is at the uniform velocity vertically put into what step 2 obtained
γ-Al2O3In colloidal sol, it is submerged completely, after standing 20min, cord is at the uniform velocity pulled out, it is molten to blow off the aluminium blocked in hole
Glue, stands dry at room temperature, be placed in baking oven, 3h is dried at 120 DEG C, the cord after drying then is placed in horse
Not in stove, the calcination 3h at 550 DEG C；γ-the Al that step 2 obtains are placed into after taking-up2O3In colloidal sol, it is set to be submerged completely,
After standing 20min, cord is at the uniform velocity pulled out, blows off the Aluminum sol blocked in hole, stood dry at room temperature, be placed on baking
In case, 3h is dried at 120 DEG C, then the cord after drying is placed in Muffle furnace, the calcination 3h at 550 DEG C, so repeats
4 times, that is, γ-Al are made2O3γ-the Al that coating rate is about 5%2O3/cord；
Step 4：Weigh in the balance and take PdCl2Solid 0.25g is some in beaker, adds 100ml ultra-pure waters, instills 0.5ml
Beaker, is placed on magnetic stirring apparatus by concentrated hydrochloric acid after being stirred evenly with glass bar, and temperature is set as 50 DEG C, at the uniform velocity stirs, until
Solid is completely dissolved, and PdCl is so made2Solution；
Then γ-the Al that will be obtained in step 32O3γ-the Al that coating rate is about 7.1%2O3/ cord is placed in PdCl2Dilution
In solution, and it is heated, until PdCl2After dilute solution is evaporated completely, γ-Al are taken out2O3/ cord, blowout residual
Liquid, is placed in air and naturally dries to two γ-Al2O3Do not bond mutually, be then placed in baking oven, in 120 between/cord
DEG C drying 2h, by the γ-Al after drying2O3/ cord is placed in the hydrazine hydrate that concentration is 1%, and reduction leaching is carried out to precious metals pd
Stain reductase 12 h obtains the integral catalyzer of the present invention for super low concentration methyl hydride combustion, i.e. Pd- γ-Al2O3/
The mass percentage of cord, its Pd are 0.5%.
Moreover, it will be appreciated that although the present specification is described in terms of embodiments, not each embodiment is only wrapped
Containing an independent technical solution, this narrating mode of specification is only that those skilled in the art should for clarity
Using specification as an entirety, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (3)
1. a kind of integral catalyzer for super low concentration methyl hydride combustion, including carrier, coating and noble metal, the carrier are
Cordierite honeycomb ceramic, its specific surface area are 0.81m2/ g, aperture 3mm；The coating is γ-Al2O3Tie coat, it is described
Al in tie coat2O3Mass percentage be 5%-10%, the noble metal is that the quality percentage of palladium Pd, the Pd contain
Measure as 0.1%-2%.
A kind of 2. preparation method of integral catalyzer for super low concentration methyl hydride combustion in claim 1, it is characterised in that：
Include the following steps：
Step 1：Cordierite honeycomb ceramic is cleaned with deionized water, removes the dust in its surface and hole, after naturally dry
It is put into baking oven and dries 2h in 110 DEG C, the cordierite honeycomb ceramic after drying is placed in equipped with the nitric acid that concentration is 8%-10%
Soaked in solution beaker, until being completely immersed in, then beaker is sealed with masking foil, stands 1.5h-2h at normal temperatures, is taken
Go out cordierite honeycomb ceramic, and cleaned with deionized water, be placed again into after naturally dry in baking oven and dry 3h in 120 DEG C, then
It is placed in again in Muffle furnace, calcines 2h in 450 DEG C, obtain the cordierite honeycomb ceramic of preliminary treatment, i.e. cord；
Step 2：Boehmite dry glue powder is placed in beaker, adds deionized water, it is then adjusted with nitric acid,
PH value is adjusted to 3-4, after stirring 15min with glass bar, obtains Aluminum sol, then 1ml polyethylene glycol is added into Aluminum sol, so
Beaker is placed on magnetic stirring apparatus afterwards, design temperature is 15-20 DEG C, high-speed stirred 2h, after standing, obtains γ-Al2O3Colloidal sol；
Step 3：The cord obtained in step 1 is fixed with thin wire, and be at the uniform velocity vertically put into γ that step 2 obtains-
Al2O3In colloidal sol, it is submerged completely, after standing 20min-30min, cord is at the uniform velocity pulled out, it is molten to blow off the aluminium blocked in hole
Glue, stands dry at room temperature, be placed in baking oven, 3h-4h is dried at 120 DEG C, be then placed in the cord after drying
In Muffle furnace, the calcination 3h at 400 DEG C -550 DEG C；γ-the Al that step 2 obtains are placed into after taking-up2O3In colloidal sol, make its complete
It is submerged, after standing 20min-30min, cord is at the uniform velocity pulled out, blows off the Aluminum sol blocked in hole, stands dry in the air at room temperature
It is dry, be placed in baking oven, 3h-4h dried at 120 DEG C, then the cord after drying is placed in Muffle furnace, 400 DEG C-
Calcination 3h at 550 DEG C, so repeats 3-5 times, that is, γ-Al is made2O3γ-the Al that coating rate is about 5%-10%2O3/cord；
Step 4：γ-the Al that will be obtained in step 32O3γ-the Al that coating rate is about 5%-10%2O3/ cord is placed in PdCl2It is dilute
Release in solution, and it is heated, until PdCl2After dilute solution is evaporated completely, γ-Al are taken out2O3/ cord, blowout residual
Liquid, is placed in air and naturally dries to two γ-Al2O3Do not bond mutually, be then placed in baking oven, in 100 between/cord
DEG C of -120 DEG C drying 2h, by the γ-Al after drying2O3/ cord is placed in the hydrazine hydrate that concentration is 1%, and precious metals pd is gone back
Original dipping reductase 12 h is to obtain the integral catalyzer of the present invention for super low concentration methyl hydride combustion, i.e. Pd- γ-
Al2O3/cord。
3. a kind of preparation method of integral catalyzer for super low concentration methyl hydride combustion according to claim 2, its
It is characterized in that：The PdCl2The preparation method of dilute solution is：
Weigh in the balance and take PdCl2Solid is put into beaker, adds 100ml ultra-pure waters, instills concentrated hydrochloric acid, wherein PdCl2Weight with
The volume ratio of concentrated hydrochloric acid is 1:2, beaker is placed on magnetic stirring apparatus after being stirred evenly with glass bar, temperature is set as 50 DEG C,
At the uniform velocity stir, until solid is completely dissolved, PdCl is so made2Solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711216857.7A CN107899570A (en) | 2017-11-28 | 2017-11-28 | Integral catalyzer for super low concentration methyl hydride combustion and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711216857.7A CN107899570A (en) | 2017-11-28 | 2017-11-28 | Integral catalyzer for super low concentration methyl hydride combustion and preparation method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN107899570A true CN107899570A (en) | 2018-04-13 |
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Application publication date: 20180413 |