CN105435833A - Selective catalytic reduction (SCR) catalyst preparation method - Google Patents
Selective catalytic reduction (SCR) catalyst preparation method Download PDFInfo
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Abstract
The present invention discloses a selective catalytic reduction (SCR) catalyst preparation method which comprises the following steps: (1) adding pseudo-boehmite and deionized water into a blender for fully stirring, adding a surfactant into the stirred suspension, and when the surfactant is completely dissolved, adding nitric acid to adjust the pH of the suspension to be 0.5 to 1 to form a stable homogeneous alumina sol; (2) adding a molecular sieve and deionized water into the alumina sol for ball-milling to obtain coating slurry; and (3) dipping a cellular ceramic into the coating slurry, taking the cellular ceramic out, completely blowing the remaining slurry in channels, dipping and drying for repeated three times, and finally roasting to obtain an integral selective catalytic reduction (SCR ) catalyst. The uploading amount of the selective catalytic reduction (SCR) catalyst is high, a coating is even, and the rate of falling off is low.
Description
Technical field
The present invention relates to the technical field of purifying vehicle exhaust, be specifically related to a kind of preparation method that can be applicable to the catalyst in the fields such as diesel engine vent gas catalytic purification.
Background technology
Along with developing rapidly of automobile industry, China's automobile pollution continues to increase.Compared with gasoline car, the advantages such as diesel vehicle is more energy-conservation with it, the greenhouse gases of discharge are less are subject to people and pay close attention to widely, but people are while enjoying the material benefit that diesel vehicle brings, and the pollution problem that exhaust emissions brings is also increasingly severe.In recent years, the pollution problem solving oxynitrides generation in exhaust gas from diesel vehicle has been subject to the great attention of each side, and tail gas catalytic purification method is widely used as a kind of effective means reducing exhaust pollution.And with molecular sieve type NH
3-SCR catalyst has been considered to one of most effective method of catalytic purification of nitroxide.And molecular sieve aluminum oxide coating layer is more in the past compared, general upper carrying capacity is very low, and general three upper carrying capacity below 25%, and are easy to come off.
Summary of the invention
The object of the present invention is to provide the preparation method of a kind of selective reduction (SCR) catalyst, with overcome catalyst coatings load capacity in prior art lower and hold caducous deficiency, compared with prior art, preparation method is simple, production cost is low, easy implementation procedure controls, and is conducive to suitability for industrialized production.
In order to solve above technical problem, the concrete technical scheme that the present invention adopts is as follows:
A kind of preparation method of selective reduction (SCR) catalyst, is characterized in that comprising the following steps:
Step one, boehmite and deionized water are added in agitator and fully stirs, in the suspension of above-mentioned stirring, add surfactant, after surfactant dissolves completely, add nitric acid, the pH regulating suspension is 0.5 ~ 1.0, forms the Alumina gel of stable homogeneous;
Step 2, molecular sieve and deionized water are joined in above-mentioned Alumina gel, ball milling obtains coating paste;
Step 3, is impregnated into ceramic honey comb in above-mentioned coating paste, blows remaining slurry in duct after taking-up, and repeated impregnations and drying 3 times, namely last roasting obtains monoblock type selective reduction (SCR) catalyst.
The preparation method of described a kind of selective reduction (SCR) catalyst, it is characterized in that: the mass ratio of boehmite and molecular sieve is 1: 8 ~ 1: 11, the mass ratio of surfactant and boehmite is 1: 20 ~ 1: 30, and the mass ratio of total solid content and water is 1: 1.5 ~ 1: 2.0.
The preparation method of described a kind of selective reduction (SCR) catalyst, is characterized in that: described surfactant is the one of polysorbas20, polysorbate40 and polysorbate60.
The preparation method of described a kind of selective reduction (SCR) catalyst, is characterized in that: described molecular sieve is ZSM-5, Beta, Y type, the one in modenite etc.
The preparation method of described a kind of selective reduction (SCR) catalyst, is characterized in that: described Ball-milling Time is 6 ~ 10 hours.
The preparation method of described a kind of selective reduction (SCR) catalyst, is characterized in that: described baking temperature is 100 ~ 130 DEG C, and the time is 3 ~ 5h.
The preparation method of described a kind of selective reduction (SCR) catalyst, is characterized in that: described sintering temperature 500 ~ 550 DEG C, and the time is 2 ~ 3h.
The present invention has beneficial effect.The present invention adds surfactant when preparing Alumina gel acidifying, controls the domain size distribution of Alumina gel better, can improve carrying capacity in coating, and has good uniformity and lower expulsion rate.
Detailed description of the invention
Below in conjunction with embodiment, technical scheme of the present invention is described in further details.
Comparative example
10.0g boehmite and 90.0g deionized water are added in agitator and fully stir, in the suspension of above-mentioned stirring, add nitric acid, the pH regulating suspension is 0.5, forms the Alumina gel of stable homogeneous; Join in above-mentioned Alumina gel by 80.0gZSM-5 molecular sieve and 90.0g deionized water, ball milling 6 hours, obtains coating paste; Be impregnated into by ceramic honey comb in above-mentioned coating paste, blow remaining slurry in duct after taking-up, be placed in 100 DEG C of dry 5h, repeated impregnations and drying 3 times, be finally placed in 500 DEG C of roasting 3h and namely obtain selective reduction (SCR) catalyst.
Embodiment 1:
10.0g boehmite and 90.0g deionized water are added in agitator and fully stir, add 0.33g polysorbate40, after polysorbate40 dissolves completely, add nitric acid in the suspension of above-mentioned stirring, the pH regulating suspension is 0.5, forms the Alumina gel of stable homogeneous; Join in above-mentioned Alumina gel by 80.0gZSM-5 molecular sieve and 90.0g deionized water, ball milling 6 hours, obtains coating paste; Be impregnated into by ceramic honey comb in above-mentioned coating paste, blow remaining slurry in duct after taking-up, be placed in 100 DEG C of dry 5h, repeated impregnations and drying 3 times, be finally placed in 500 DEG C of roasting 3h and namely obtain selective reduction (SCR) catalyst.
Embodiment 2:
10.0g boehmite and 90.0g deionized water are added in agitator and fully stir, add 0.38g polysorbas20, after polysorbas20 dissolves completely, add nitric acid in the suspension of above-mentioned stirring, the pH regulating suspension is 1.0, forms the Alumina gel of stable homogeneous; Join in above-mentioned Alumina gel by 90.0gBeta molecular sieve and 90.0g deionized water, ball milling 8 hours, obtains coating paste; Be impregnated into by ceramic honey comb in above-mentioned coating paste, blow remaining slurry in duct after taking-up, be placed in 120 DEG C of dry 4h, repeated impregnations and drying 3 times, be finally placed in 550 DEG C of roasting 2h and namely obtain selective reduction (SCR) catalyst.
Embodiment 3:
10.0g boehmite and 88.0g deionized water are added in agitator and fully stir, add 0.43g polysorbate60, after polysorbate60 dissolves completely, add nitric acid in the suspension of above-mentioned stirring, the pH regulating suspension is 0.8, forms the Alumina gel of stable homogeneous; Join in above-mentioned Alumina gel by 100.0gY type molecular sieve and 88.0g deionized water, ball milling 10 hours, obtains coating paste; Be impregnated into by ceramic honey comb in above-mentioned coating paste, blow remaining slurry in duct after taking-up, be placed in 130 DEG C of dry 3h, repeated impregnations and drying 3 times, be finally placed in 550 DEG C of roasting 2h and namely obtain selective reduction (SCR) catalyst.
Embodiment 4:
10.0g boehmite and 90.0g deionized water are added in agitator and fully stir, add 0.50g polysorbate40, after polysorbate40 dissolves completely, add nitric acid in the suspension of above-mentioned stirring, the pH regulating suspension is 1.0, forms the Alumina gel of stable homogeneous; Join in above-mentioned Alumina gel by 110.0g mordenite molecular sieve and 90.0g deionized water, ball milling 8 hours, obtains coating paste; Be impregnated into by ceramic honey comb in above-mentioned coating paste, blow remaining slurry in duct after taking-up, be placed in 110 DEG C of dry 4h, repeated impregnations and drying 3 times, be finally placed in 500 DEG C of roasting 3h and namely obtain selective reduction (SCR) catalyst.
Tested by the catalyst that comparative example and embodiment 1-4 obtain, experimental result is as shown in table 1.
Carrying capacity and expulsion rate result of the test on the catalyst that table 1 utilizes the inventive method obtained
Through testing and verification, adding of surfactant makes the upper carrying capacity of catalyst activity coating significantly improve, and the expulsion rate of coating significantly reduces, and can improve the tolerance of catalyst in adverse circumstances.
The foregoing is only preferred embodiments of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a preparation method for selective reduction (SCR) catalyst, is characterized in that comprising the following steps:
Step one, boehmite and deionized water are added in agitator and fully stirs, in the suspension of above-mentioned stirring, add surfactant, after surfactant dissolves completely, add nitric acid, the pH regulating suspension is 0.5 ~ 1.0, forms the Alumina gel of stable homogeneous;
Step 2, molecular sieve and deionized water are joined in above-mentioned Alumina gel, ball milling obtains coating paste;
Step 3, is impregnated into ceramic honey comb in above-mentioned coating paste, blows remaining slurry in duct after taking-up, and repeated impregnations and drying 3 times, namely last roasting obtains monoblock type selective reduction (SCR) catalyst.
2. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1, it is characterized in that: the mass ratio of boehmite and molecular sieve is 1: 8 ~ 1: 11, the mass ratio of surfactant and boehmite is 1: 20 ~ 1: 30, and the mass ratio of total solid content and water is 1: 1.5 ~ 1: 2.0.
3. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1 or 2, is characterized in that: described surfactant is the one of polysorbas20, polysorbate40 and polysorbate60.
4. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1 or 2, is characterized in that: described molecular sieve is ZSM-5, Beta, Y type, the one in modenite etc.
5. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1, is characterized in that: described Ball-milling Time is 6 ~ 10 hours.
6. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1, it is characterized in that: described baking temperature is 100 ~ 130 DEG C, the time is 3 ~ 5h.
7. the preparation method of a kind of selective reduction (SCR) catalyst as claimed in claim 1, it is characterized in that: described sintering temperature 500 ~ 550 DEG C, the time is 2 ~ 3h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548482A (en) * | 2019-09-26 | 2019-12-10 | 中国原子能科学研究院 | preparation method of stainless steel-based molecular sieve membrane material for adsorbing uranium hexafluoride |
| CN110624522A (en) * | 2019-09-26 | 2019-12-31 | 中国原子能科学研究院 | Preparation method of silicon-based molecular sieve membrane material for adsorbing uranium hexafluoride |
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| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN101695672A (en) * | 2009-10-26 | 2010-04-21 | 广东工业大学 | Preparation method for honeycomb ceramic carrier coating |
| CN102451741A (en) * | 2010-10-22 | 2012-05-16 | 中国石油化工股份有限公司 | Preparation method of honeycomb substrate catalyst with molecular sieve composition coating |
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| CN101209425A (en) * | 2006-12-30 | 2008-07-02 | 比亚迪股份有限公司 | Method for preparing slurry containing aluminum oxide |
| CN101695672A (en) * | 2009-10-26 | 2010-04-21 | 广东工业大学 | Preparation method for honeycomb ceramic carrier coating |
| CN102451741A (en) * | 2010-10-22 | 2012-05-16 | 中国石油化工股份有限公司 | Preparation method of honeycomb substrate catalyst with molecular sieve composition coating |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110548482A (en) * | 2019-09-26 | 2019-12-10 | 中国原子能科学研究院 | preparation method of stainless steel-based molecular sieve membrane material for adsorbing uranium hexafluoride |
| CN110624522A (en) * | 2019-09-26 | 2019-12-31 | 中国原子能科学研究院 | Preparation method of silicon-based molecular sieve membrane material for adsorbing uranium hexafluoride |
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Application publication date: 20160330 |