CN109516792A - A kind of preparation method of gas purification porous ceramics - Google Patents
A kind of preparation method of gas purification porous ceramics Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0067—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the density of the end product
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- 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
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Abstract
The invention discloses a kind of preparation methods of gas purification porous ceramics, it is made of the titanium system peroxidating metal precursor of the cordierite of 65-70wt%, the low-melting glass powder of 15-30wt%, 5-15wt%, the low-melting glass is by 10-25 wt% of potassium feldspar, 10-25wt% of albite, 30-40wt% of silica, 16-30wt% of boron oxide, 5-10wt% of lithia composition, the titanium system peroxidating metal precursor are TIO2And its N doped and compounded object, cordierite, glass powder with low melting point and titanium system peroxidating metal precursor are mixed to form mixture, add binder, lubricant and composite elasticizer, through mixing pugging and aging obtain pug, pug is placed in mold again, it is squeezed into after porous ceramics green body through dumping and is sintered, the present invention has low cost of material, simple process, easy to operate, the feature that support strength is high, load capacity is big, adhesive force is strong.
Description
Technical field
The present invention relates to formulas of a kind of porous ceramics and preparation method thereof, belong to environment protection catalytic technical field.
Background technique
Porous ceramics has the characteristics that intensity is high, expansion rate is low, resistance to thermal shock is had excellent performance, wear-resistant.It is widely used as at present
Gas purification catalyst carrier, the chemical reaction carrier of metallurgical industry, chemical industry heat-barrier material etc..
For cordierite-type porous ceramics when being used as gas purification catalyst carrier, it is small to have a low air resistance, high mechanical strong
Degree, high thermal stability feature.In addition, cordierite is cheap, raw material are easy to get, it is conducive to industrial production.But its specific surface area compared with
It is small, it is poor with the adhesive force of catalyst layer, thus cordierite-type porous ceramics is limited in high-throughput, efficient gas purifying and catalyzing neck
The application in domain.Traditional solution is to coat AL on its surface2O3Coating, then roast the γ-of formation and carrier firm connection
AL2O3Then coating impregnates noble metal active catalyst to improve the specific surface area and surface-active of carrier again, by dry
Dry, heating and reduction, are prepared active porous ceramics.But the method for this dipping noble metal active catalyst, there are following
Problem: first is that noble metal consumption is big, dipping layer is easy to fall off, troublesome in poeration and be unfavorable for ring second is that the preparation process period is long
Guarantor and large-scale production.
Summary of the invention
For it is above-mentioned the problems of in the prior art, the present invention provides a kind of preparation side of gas purification porous ceramics
Method, by introducing Titanium series catalyst presoma, it can be achieved that catalyst is with porous ceramics, disposably compound firing process, technique are simple
It is single, it is suitable for large-scale industrial production.
The present invention overcomes current porous cordierite ceramics as catalyst carrier, and load capacity is small and coating is caducous lacks
Point provides the one-time formed manufacture formula and technique of a kind of high-efficiency gas purification catalyzed porous ceramic.The porous ceramics can be
800-850 degree sintering, are applied to low-temperature catalyzed, field of purification.
The present invention is as follows using technical solution:
A kind of preparation method of gas purification porous ceramics, it is by the cordierite of 65-70wt%, the low melting point glass of 15-30wt%
The titanium system peroxidating metal precursor composition of glass powder, 5-15wt%, the glass powder with low melting point is by 10-25 wt% of potassium feldspar, sodium
10-25wt% of feldspar, 30-40wt% of silica, 16-30wt% of boron oxide, 5-10wt% of lithia composition, titanium system mistake
Oxidized metal presoma is TIO2And its N doped and compounded object, and step is prepared by the following method:
A, first by 10-25wt% of potassium feldspar, 10-25wt% of albite, 30-40wt% of silica, boron oxide
Ball milling mixing is uniform in proportion and is sieved by 16-30wt% and 5-10wt% of lithia, then glass is made in high temperature sintering heat preservation
Liquid, then glass dregs will be obtained after glass metal water quenching, by glass dregs be put into ball grinder with after alcohol ball milling, dry sieving again and obtain
The glass powder with low melting point that granularity is 1-53 μm,
B, titanyl sulfate is dissolved in distilled water, adds the concentrated ammonia solution that mass percentage concentration is 25% and mixes and adjust pH value
It is 7, adds the hydrogenperoxide steam generator that mass percentage concentration is 30%, obtains the titanium system peroxidating metal front that solid content is 30%
Body,
C, cordierite, glass powder with low melting point and titanium system peroxidating metal precursor are mixed to form mixture, add and accounts for mixing
Expect the binder of 1-5wt% of weight, account for the lubricant of 0.1-1wt% of mixture weight and account for 0.5-1wt of mixture weight respectively
The composite elasticizer that the glycerol of the polyethylene glycol of % and 0.1-0.5 wt % are mixed through mixing pugging and aging obtains mud
Material, then pug is placed in mold, it is squeezed into porous ceramics green body,
D, by porous ceramics green body after molding in 300-400 DEG C of heat preservation dumping, training is then kept the temperature in 800-850 DEG C of electric furnaces
2-3h are burnt, furnace cooling obtains a kind of gas purification porous ceramics containing catalyst.
The fusion temperature of the glass powder with low melting point is 390-780 DEG C, is helped by natural high-purity nonmetallic ore and environmental protection
Melt material etc., the functional micro mist being process through multiple tracks techniques such as broken, high-purity water process, drying, airflow milling, selection by winnowing.
Binder is preferably methylcellulose in the gas purification porous ceramics.
Lubricant is preferably zinc stearate in the gas purification porous ceramics.
Gas purification porous ceramics provided by the invention, it is disposable with porous cordierite ceramics to may be implemented Titanium series catalyst
Compound firing moulding process solves porous cordierite ceramics first is that being able to achieve porous ceramics disposably compound firing moulding process
As catalyst carrier, load capacity is small, adhesive force is poor disadvantage；Second is that solving using porous cordierite ceramics as carrier
The problem of dipping noble metal active Catalytic Layer is at high cost, dipping layer is easy to fall off, gas purification porous ceramics tool of the present invention
There are low cost of material, simple process, easy to operate, the feature that support strength is high, load capacity is big, adhesive force is strong.
Specific embodiment
Gas purification porous ceramics performance indicator of the present invention is:
Compression strength (MPa): >=8.5, porosity (%): >=65, water absorption rate (%): < 1
Density (g/cm3): 0.9-1.5, acid-alkali-resistant degree (%): >=90, specific surface area (m2/m3): >=350.
Illustrate the preparation process in gas purification porous ceramics by following embodiment.
Embodiment 1
By 10 grams of potassium feldspar, 15 grams of albite, 40 grams of silica, 30 grams of boron oxide, 5 grams of lithia, mix in proportion
And be sieved, glass metal is made in 1200 DEG C of sintered heat insulating 1h, then glass dregs will be obtained after glass metal water quenching, by glass dregs in ball milling
In tank with alcohol ball milling for 24 hours after, then dry be sieved granularity is 1~53 μm of glass powder with low melting point.Again by 100 grams of titanyl sulfates
It is dissolved in 100ml distilled water, the concentrated ammonia liquor that 50ml mass fraction is 25% is added, adding 50ml mass fraction is 30% peroxidating
Aqueous solution of hydrogen obtains the titanium system peroxidating metal precursor that mass fraction is 30%.By 70 grams of cordierite, glass powder with low melting point is
25 grams, after 5 grams of three kinds of ceramic raw materials of titanium system peroxidating metal precursor premix, 5 grams of methylcellulose are sequentially added, stearic acid
0.7 gram of zinc, (1000) 0.8 grams of polyethylene glycol (preferably), 0.5 gram of additive of glycerol carry out mixing pugging and it is aging obtain pug,
Pug is placed in mold, extrusion forming, porous ceramics green body after molding is in 300 DEG C of heat preservation 60min dumpings, then 800
3h is kept the temperature in DEG C electric furnace, furnace cooling obtains gas purification porous ceramics.
Embodiment 2
By 15 grams of potassium feldspar, 25 grams of albite, 35 grams of silica, 15 grams of boron oxide, 10 grams of lithia, mix in proportion
And be sieved, glass metal is made in 1200 DEG C of sintered heat insulating 1h, glass dregs will be obtained after glass metal water quenching, by glass dregs in ball grinder
It is middle with alcohol ball milling for 24 hours after, then dry be sieved granularity is 1~53 μm of glass powder with low melting point.100 grams of titanyl sulfates are dissolved in
The concentrated ammonia liquor that 50ml mass fraction is 25% is added in 100ml distilled water, and adding 50ml mass fraction is 30% aquae hydrogenii dioxidi
Solution obtains the titanium system peroxidating metal precursor that mass fraction is 30%.By 65 grams of cordierite, glass powder with low melting point is 20 grams,
After 15 ceramic raw material gram of titanium system peroxidating metal precursor premix, 3 grams of methylcellulose are sequentially added, 0.3 gram of zinc stearate,
(1000) 1.0 grams of polyethylene glycol (preferably), 0.4 gram of additive of glycerol carry out mixing pugging and it is aging obtain pug, pug is set
In mold, extrusion forming, porous ceramics green body after molding is in 350 DEG C of heat preservation 60min dumpings, then in 830 DEG C of electric furnaces
2.5h is kept the temperature, furnace cooling obtains gas purification porous ceramics.
Embodiment 3
By 25 grams of potassium feldspar, 10 grams of albite, 30 grams of silica, 25 grams of boron oxide, 10 grams of lithia, mix in proportion
And be sieved, glass metal is made in 1200 DEG C of sintered heat insulating 1h, then glass dregs will be obtained after glass metal water quenching, by glass dregs in ball milling
In tank with alcohol ball milling for 24 hours after, then dry be sieved granularity is 1~53 μm of glass powder with low melting point.100 grams of titanyl sulfates are molten
In 100ml distilled water, the concentrated ammonia liquor that 50ml mass fraction is 25% is added, adding 50ml mass fraction is 30% hydrogen peroxide
Aqueous solution obtains the titanium system peroxidating metal precursor that mass fraction is 30%.By 65 grams of cordierite, glass powder with low melting point 25
Gram, 10 grams of ceramic raw material premixs of titanium system peroxidating metal precursor sequentially add 2 grams of methylcellulose, zinc stearate 0.8
Gram, (1000) 0.4 grams of polyethylene glycol (preferably), 0.2 gram of additive of glycerol carry out mixing pugging and it is aging obtain pug, by pug
It is placed in mold, extrusion forming, porous ceramics green body after molding is in 400 DEG C of heat preservation 60min dumpings, then in 850 DEG C of electric furnaces
After 2 h of middle heat preservation, furnace cooling obtains gas purification porous ceramics.
Gas purification porous ceramics performance test results are as follows in each embodiment:
Embodiment one
Compression strength (MPa): 10.5, porosity (%): 72.3, water absorption rate (%): 0.85
Density (g/cm3): 1.08, acid-alkali-resistant degree (%): 95, specific surface area (m2/m3): 402.
Embodiment two,
Compression strength (MPa): 8.95, porosity (%): 70.2, water absorption rate (%): 0.75
Density (g/cm3): 0.98, acid-alkali-resistant degree (%): 95, specific surface area (m2/m3): 376.
Embodiment three,
Compression strength (MPa): 9.57, porosity (%): 68.3, water absorption rate (%): 0.71
Density (g/cm3): 0.94, acid-alkali-resistant degree (%): 95, specific surface area (m2/m3): 381.
Claims (3)
1. a kind of preparation method of gas purification porous ceramics, it is characterised in that: it by 65-70wt% cordierite, 15-
The titanium system peroxidating metal precursor composition of the glass powder with low melting point of 30wt%, 5-15wt%, the glass powder with low melting point are long by potassium
Stone 10-25 wt%, 10-25wt% of albite, 30-40wt% of silica, 16-30wt% of boron oxide, 5-10wt% of lithia
Composition, the titanium system peroxidating metal precursor are TIO2And its N doped and compounded object, and step is prepared by the following method:
A, first by 10-25wt% of potassium feldspar, 10-25wt% of albite, 30-40wt% of silica, 16-30wt% of boron oxide and
5-10wt% of lithia in proportion uniformly and be sieved by ball milling mixing, then high temperature sintering heat preservation is made glass metal, then by glass metal water
Glass dregs are obtained after quenching, by glass dregs be put into ball grinder with after alcohol ball milling, again dry be sieved granularity is 1~53 μm low
Melting glass frit,
B, titanyl sulfate is dissolved in distilled water, the concentrated ammonia solution that addition mass percentage concentration is 25%, which mixes and adjusts pH value, is
7, the hydrogenperoxide steam generator that mass percentage concentration is 30% is added, the titanium system peroxidating metal front that solid content is 30% is obtained
Body,
C, cordierite, glass powder with low melting point and titanium system peroxidating metal precursor are mixed to form mixture, add and accounts for mixing
Expect the binder of 1-5%w of weight, account for the lubricant of 0.1-1wt% of mixture weight and account for 0.5-1wt of mixture weight respectively
The composite elasticizer that the glycerol of the polyethylene glycol of % and 0.1-0.5 wt % are mixed through mixing pugging and aging obtains mud
Material, then pug is placed in mold, it is squeezed into porous ceramics green body,
D, by porous ceramics green body after molding in 300-400 DEG C of heat preservation dumping, 2-are then kept the temperature in 800-850 DEG C of electric furnaces
3h after furnace cooling, obtains a kind of gas purification porous ceramics containing catalyst.
2. a kind of preparation method of gas purification porous ceramics according to claim 1, it is characterised in that: the binder
For methylcellulose.
3. a kind of preparation method of gas purification porous ceramics according to claim 1, it is characterised in that: the lubricant
For zinc stearate.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114262210A (en) * | 2021-12-17 | 2022-04-01 | 佛山欧神诺陶瓷有限公司 | Foamed ceramic with high sunlight reflection performance and heat insulation and preservation and preparation method thereof |
| CN116140346A (en) * | 2022-10-20 | 2023-05-23 | 中国人民解放军63653部队 | Material for in-situ glass solidification rapid electric starting and paving and application methods thereof |
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| CN114262210A (en) * | 2021-12-17 | 2022-04-01 | 佛山欧神诺陶瓷有限公司 | Foamed ceramic with high sunlight reflection performance and heat insulation and preservation and preparation method thereof |
| CN114262210B (en) * | 2021-12-17 | 2023-01-06 | 佛山欧神诺陶瓷有限公司 | Foamed ceramic with high sunlight reflection performance and heat insulation and preservation and preparation method thereof |
| CN116140346A (en) * | 2022-10-20 | 2023-05-23 | 中国人民解放军63653部队 | Material for in-situ glass solidification rapid electric starting and paving and application methods thereof |
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