CN102989524A - Honeycomb ceramic catalyst active coating and preparation method thereof - Google Patents
Honeycomb ceramic catalyst active coating and preparation method thereof Download PDFInfo
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- CN102989524A CN102989524A CN2012105492022A CN201210549202A CN102989524A CN 102989524 A CN102989524 A CN 102989524A CN 2012105492022 A CN2012105492022 A CN 2012105492022A CN 201210549202 A CN201210549202 A CN 201210549202A CN 102989524 A CN102989524 A CN 102989524A
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- honey comb
- boehmite
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Abstract
The invention discloses a honeycomb ceramic catalyst surface active coating, which is characterized by comprising slurry components such as alumina, pseudo-boehmite, glycerol, nitric acid and deionized water, wherein the mass ratio of the alumina to the pseudo-boehmite is (1:4)-(1:7), the mass ratio of the total solid content to water is (1:1.5)-(1:2), and the mass ratio of the glycerol to water is (0.6:15)-(0.6:20). A preparation method of the coating comprises the steps: mixing the glycerol and the deionized water, fully stirring the glycerol and the deionized water in a stirrer to reach a uniform state; adding the alumina and the pseudo-boehmite into an obtained mixture solution, and fully stirring; adding the nitric acid into the obtained turbid liquid obtained after stirring for acidizing treatment, and regulating the pH range of the turbind liquid to be 3-4; repeatedly immersing honeycomb ceramic in coating slurry for 10 minutes, and then, purging the surplus coating slurry on the surface of the honeycomb ceramic by using high-pressure air; and drying and roasting the well coated honeycomb ceramic to prepare the honeycomb ceramic surface active coating. The active alumina coating prepared according to the invention has the characteristics of higher in charge capacity, uniformity, stable physical and chemical properties and the like.
Description
Technical field
That the present invention relates to is a kind of preparation method of ceramic honeycomb catalyst active coating, is specifically related to a kind of preparation method of active coating of ceramic honeycomb catalyst of the fields such as catalytic purification that can be applicable to hemi-closure space gas pollutant such as carbon monoxide, nitric oxide etc.Belong to the catalyst material preparing technical field.
Background technology
Ceramic honey comb is a kind ofly neatly to be distributed by many parallel tiny ducts, similar cellular a kind of Extruded Monolithic Celluar Ceramics, and it has the advantages such as high temperature resistant and anti-oxidant, often is applied in the integral catalyzer carrier as catalyst.But the common specific area of ceramic honey comb smaller (specific area＜1m of cordierite honeycomb ceramic carrier for example all
2/ g), be not enough to the active component of dispersed catalyst.In order to make the catalyst activity component can be in the honeycomb ceramic carrier surface distributed evenly and have a preferably catalytic performance, need to apply the last layer active coating on the surface of ceramic honey comb, this coating should have the active component that larger specific area is enough to dispersed catalyst, should there be enough bond strengths not run off to guarantee the catalyst activity component with ceramic honey comb simultaneously, reach the effect of rugged catalyst component.Thereby seek and to have high-specific surface area and the active coating strong with the honeycomb ceramic carrier adhesion, the raising of ceramic honeycomb catalyst catalytic performance and the enhancing of catalytic stability are had key effect.
Present employed coating material main component is aluminium oxide, is added with simultaneously other component, such as boehmite, titanium dioxide, cerium zirconium sosoloid and surfactant etc.Different blending ingredients and the ratio between the component have vital impact to the preparation of active coating.The step that the coating preparation process relates generally to has: the preliminary treatment of honeycomb ceramic carrier; The preparation of slurry; The slurry of honeycomb ceramic carrier injects; Drying and the roasting of honeycomb ceramic carrier behind the removal of unnecessary slurry and the coating slurry.Can find out the preparation that the most important thing is slurry the coating preparation process from this, need select suitable pulp components and regulate suitable ratio and just can prepare and to have high capacity amount, high bond strength and uniform and stable active coating.Chinese patent CN1954916A discloses a kind of preparation method of active coating of integral catalyst, it is with the coating material for preparing, mainly comprise boehmite, aluminium oxide, silica, rare earth oxide, alkaline-earth oxide and transition metal oxide etc., method by airless spraying is coated on the pretreated monolithic substrate, has then obtained active coating through vacuum extraction, drying and calcination process again.But it uses vacuum equipment to process, so that the cost of coating preparation process increases, even used vacuum technique simultaneously, changes active coating load capacity that method obtains also only at 5-20 wt%.Chinese patent CN101653724A also discloses a kind of preparation method of ceramic honeycomb catalyst face coat, adopts dipping method that coating paste is coated in the cordierite honeycomb ceramic surface, and the load capacity of active coating is still below 20wt%.
Summary of the invention
In order to overcome the lower deficiency of prior art coating load amount, the invention provides a kind of ceramic honey comb surface active coating and preparation method thereof.
A kind of ceramic honey comb surface active coating is characterized in that, its pulp components is aluminium oxide, boehmite, glycerine, nitric acid and deionized water.
Described aluminium oxide is formed through 500-600 ℃ of roasting by boehmite.
Described boehmite component is Al
2O
3NH
2O, wherein 1≤n≤3.
A kind of preparation method of ceramic honey comb surface active coating is characterized in that, may further comprise the steps:
(1) glycerine and deionized water are mixed rear being stirred well to evenly in agitator;
(2) aluminium oxide and boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10 minutes, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is dried calcination process and namely make the ceramic honey comb surface active coating.
The mass ratio of described glycerine and deionized water is 0.6:15～0.6:20, and the total solid content of aluminium oxide and boehmite and the ratio of deionized water are 1:1.5～1:2, and the ratio of aluminium oxide and boehmite is 1:4～1:7.
Described oven dry calcination process condition is: in 120 ℃ of baking ovens dry 12 hours, and again roasting 4 hours in 500 ℃ of Muffle furnaces.
The load capacity computational methods of ceramic honey comb are among the present invention: W=(m
1-m
0)/m
0X 100%.
Wherein: W is Supported Honeycomb Ceramics amount (%), m
0Be the quality (g) of the blank ceramic honey comb before the load coating, m
1Be the ceramic honey comb quality (g) after load coating and the roasting.
The aluminium oxide active coating that a process for preparing has that load capacity is high, coating applies all that even coating and honeycomb ceramic carrier directly have stronger adhesion.The present invention utilizes hydroxyl and the hydroxyl effect of aluminium oxide and nitric acid makes slurry to the hydrolysis of boehmite the viscosity increase of glycerine construction unit in the slurry, is conducive to improve the combination degree between coating paste and the honeycomb ceramic carrier.The honeycomb ceramic carrier aluminum oxide coating layer that obtains after roasting is apparent evenly, obvious cracking phenomena do not occur.The load capacity of this invention is high, and compared with prior art the preparation method is simple, and production cost is low, and easily implementation procedure control is conducive to suitability for industrialized production.
The specific embodiment
The below elaborates to embodiments of the invention: the present embodiment is implemented under take technical solution of the present invention as prerequisite, has provided detailed embodiment and operating process, but protection scope of the present invention is not limited to following embodiment:
Embodiment 1:
(1) takes by weighing 3.6g glycerine and 120g deionized water, in agitator, be stirred well to evenly;
(2) 12g aluminium oxide and 48g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 11.6wt% among this embodiment.
Embodiment 2:
(1) takes by weighing 3.6g glycerine and 120g deionized water, in agitator, be stirred well to evenly;
(2) 10g aluminium oxide and 50g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 18.6wt% among this embodiment.
Embodiment 3:
(1) takes by weighing 3.6g glycerine and 120g deionized water, in agitator, be stirred well to evenly;
(2) 8.6g aluminium oxide and 51.4g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 12.5wt% among this embodiment.
Embodiment 4:
(1) takes by weighing 3.6g glycerine and 120g deionized water, in agitator, be stirred well to evenly;
(2) 7.5g aluminium oxide and 52.5g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 10.3wt% among this embodiment.
Embodiment 5:
(1) takes by weighing 3.6g glycerine and 90g deionized water, in agitator, be stirred well to evenly;
(2) 12g aluminium oxide and 48g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 20.1wt% among this embodiment.
Embodiment 6:
(1) takes by weighing 3.6g glycerine and 90g deionized water, in agitator, be stirred well to evenly;
(2) 10g aluminium oxide and 50g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 21.3wt% among this embodiment.
Embodiment 7:
(1) takes by weighing 3.6g glycerine and 90g deionized water, in agitator, be stirred well to evenly;
(2) 8.6g aluminium oxide and 51.4g boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10min, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is processed 12h in 120 ℃ of baking ovens, roasting 4h namely makes ceramic honey comb active oxidation aluminized coating in 500 ℃ of Muffle furnaces again.
Through weighing, the load capacity of active coating is 20.5wt% among this embodiment.
Claims (7)
1. a ceramic honeycomb catalyst surface active coating is characterized in that, its pulp components is aluminium oxide, boehmite, glycerine, nitric acid and deionized water.
2. according to right 1 described a kind of ceramic honeycomb catalyst surface active coating, it is characterized in that, described aluminium oxide is formed through 500-600 ℃ of roasting by boehmite.
3. according to right 1 described a kind of ceramic honeycomb catalyst surface active coating, it is characterized in that, described boehmite component is Al
2O
3NH
2O, wherein 1≤n≤3.
4. according to the preparation method of the described a kind of ceramic honeycomb catalyst surface active coating of right 1-3 any one, it is characterized in that, may further comprise the steps:
(1) glycerine and deionized water are mixed rear being stirred well to evenly in agitator;
(2) aluminium oxide and boehmite are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10 minutes, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats is dried calcination process and namely make the ceramic honey comb surface active coating.
5. according to the preparation method of right 4 described a kind of ceramic honeycomb catalyst surface active coatings, it is characterized in that, the mass ratio of described glycerine and deionized water is 0.6:15～0.6:20, the total solid content of aluminium oxide and boehmite and the ratio of deionized water are 1:1.5～1:2, and the ratio of aluminium oxide and boehmite is 1:4～1:7.
6. according to the preparation method of right 4 described a kind of ceramic honeycomb catalyst surface active coatings, it is characterized in that, described oven dry calcination process condition is: in 120 ℃ of baking ovens dry 12 hours, and again roasting 4 hours in 500 ℃ of Muffle furnaces.
7. according to the preparation method of right 4 described a kind of ceramic honeycomb catalyst surface active coatings, it is characterized in that, may further comprise the steps:
(1) 3.6 gram glycerine and 90 gram deionized waters are stirred well in agitator evenly;
(2) 10 gram aluminium oxide and 50 gram boehmites are joined fully stirring in the mentioned solution;
(3) add nitric acid in the suspension of above-mentioned stirring and carry out acidification, the pH scope of regulating suspension is 3～4;
(4) ceramic honey comb is immersed in the coating paste repeatedly, dip time is 10 minutes, then purges the unnecessary coating paste in ceramic honey comb surface by pressure-air;
(5) ceramic honey comb that coats was processed 12 hours in 120 ℃ of baking ovens, roasting namely made the ceramic honey comb surface active coating in 4 hours in 500 ℃ of Muffle furnaces again.
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| CN2012105492022A CN102989524A (en) | 2012-12-18 | 2012-12-18 | Honeycomb ceramic catalyst active coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105492022A CN102989524A (en) | 2012-12-18 | 2012-12-18 | Honeycomb ceramic catalyst active coating and preparation method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104998697A (en) * | 2015-07-10 | 2015-10-28 | 上海纳米技术及应用国家工程研究中心有限公司 | Application method for integral catalyst active coating |
| CN107855124A (en) * | 2017-11-16 | 2018-03-30 | 苏州甫众塑胶有限公司 | A kind of preparation method of honeycomb substrate coating |
| CN109594419A (en) * | 2018-12-19 | 2019-04-09 | 龙游旭荣纸业有限公司 | A kind of production method of high quantitative paper for daily use |
| CN110354864A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | Converter emission coal gas, which is controlled oneself, is catalyzed burning ceramic honeycomb catalyst, preparation method |
| CN113277882A (en) * | 2021-06-30 | 2021-08-20 | 江西省萍乡市湘东石油化工填料厂 | Modified chrome corundum slurry for surface of honeycomb ceramic heat accumulator and pulping method thereof |
| CN114433060A (en) * | 2020-10-16 | 2022-05-06 | 中国石油化工股份有限公司 | Catalyst for treating bromine-containing petrochemical organic waste gas and preparation method and application thereof |
| CN114749217A (en) * | 2022-05-07 | 2022-07-15 | 南京开特环保科技有限公司 | Honeycomb ceramic catalyst active coating and preparation method thereof |
| CN114904512A (en) * | 2022-05-07 | 2022-08-16 | 南开大学深圳研究院 | Mullite-type loaded honeycomb ceramic catalyst surface active coating and preparation method thereof |
-
2012
- 2012-12-18 CN CN2012105492022A patent/CN102989524A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104998697B (en) * | 2015-07-10 | 2017-07-18 | 上海纳米技术及应用国家工程研究中心有限公司 | A kind of coating method of active coating of integral catalyst |
| CN104998697A (en) * | 2015-07-10 | 2015-10-28 | 上海纳米技术及应用国家工程研究中心有限公司 | Application method for integral catalyst active coating |
| CN107855124A (en) * | 2017-11-16 | 2018-03-30 | 苏州甫众塑胶有限公司 | A kind of preparation method of honeycomb substrate coating |
| CN109594419A (en) * | 2018-12-19 | 2019-04-09 | 龙游旭荣纸业有限公司 | A kind of production method of high quantitative paper for daily use |
| CN109594419B (en) * | 2018-12-19 | 2020-02-14 | 龙游旭荣纸业有限公司 | Production method of high-quantitative household paper |
| CN110354864B (en) * | 2019-07-31 | 2023-04-28 | 中国科学院力学研究所 | Self-sustaining catalytic combustion honeycomb ceramic catalyst for converter diffused gas and preparation method thereof |
| CN110354864A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | Converter emission coal gas, which is controlled oneself, is catalyzed burning ceramic honeycomb catalyst, preparation method |
| CN114433060A (en) * | 2020-10-16 | 2022-05-06 | 中国石油化工股份有限公司 | Catalyst for treating bromine-containing petrochemical organic waste gas and preparation method and application thereof |
| CN114433060B (en) * | 2020-10-16 | 2024-02-02 | 中国石油化工股份有限公司 | Bromated organic waste gas treatment catalyst and preparation method and application thereof |
| CN113277882A (en) * | 2021-06-30 | 2021-08-20 | 江西省萍乡市湘东石油化工填料厂 | Modified chrome corundum slurry for surface of honeycomb ceramic heat accumulator and pulping method thereof |
| CN113277882B (en) * | 2021-06-30 | 2022-07-19 | 江西省萍乡市湘东石油化工填料厂 | Modified chrome corundum slurry for surface of honeycomb ceramic heat accumulator and pulping method and application thereof |
| CN114904512A (en) * | 2022-05-07 | 2022-08-16 | 南开大学深圳研究院 | Mullite-type loaded honeycomb ceramic catalyst surface active coating and preparation method thereof |
| CN114749217A (en) * | 2022-05-07 | 2022-07-15 | 南京开特环保科技有限公司 | Honeycomb ceramic catalyst active coating and preparation method thereof |
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Application publication date: 20130327 |