CN111068706A - Preparation method of denitration catalyst - Google Patents
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/889—Manganese, technetium or rhenium
- B01J23/8892—Manganese
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- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0018—Addition of a binding agent or of material, later completely removed among others as result of heat treatment, leaching or washing,(e.g. forming of pores; protective layer, desintegrating by heat)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
Abstract
The invention discloses a preparation method of a denitration catalyst, which comprises the following steps: uniformly mixing aluminum salt, polyethylene glycol, alumina sol, amide compounds and alcohol-water solution, adding a gelling agent, and uniformly mixing; immersing the pretreated cordierite honeycomb ceramic substrate into the mixture for treatment, taking out, blowing off residual liquid, aging for a period of time, soaking an aging product by using an alcohol solution, then carrying out solid-liquid separation, and drying and roasting a solid phase to obtain a cordierite honeycomb ceramic carrier loaded with a coating; and (3) impregnating the carrier with an impregnation liquid containing an active component, drying and roasting to obtain a final product. The denitration catalyst coating prepared by the method disclosed by the invention contains more macropores, the macropores are uniformly distributed, a certain mechanical strength can be ensured, the denitration catalyst coating has good denitration activity, the preparation process is simple, and the denitration catalyst coating is suitable for industrial application.
Description
Technical Field
The invention relates to a preparation method of a denitration catalyst.
Background
The denitration catalyst is the core of the SCR technology, and the flue gas volume of power plants, industrial boilers and the like is largeThe denitration catalyst generally adopts a monolithic structure. CN101380543A discloses a flue gas denitration composite catalyst, which uses aluminum-based or silicon-based ceramic as a first carrier, silicon-aluminum composite oxide as a second carrier, and cerium-zirconium composite metal oxide as an active component. CN101961656A discloses a denitration catalyst which is loaded with TiO2-SiO2The cordierite honeycomb ceramic of the coating is taken as a carrier, and the active component is V2O5、WO3、MoO3、SO4 2-Two or more of (1) and (b). CN102008952A discloses a denitration composite oxide catalyst, which uses honeycomb ceramics as a carrier, uses a Ti-Zr composite oxide as a carrier coating, and uses a tin-cerium-tungsten composite oxide as an active component. CN101357328A discloses a denitration catalyst, which takes silicon-based ceramic as a carrier and active SiO2Is used as a second carrier, and a proper amount of transition metal is added into the cerium oxide as an active component. CN1593752A discloses a catalyst for SCR denitration of power station flue gas. The catalyst is loaded with Al on cordierite honeycomb2O3For the carrier coating, carrying V2O5And WO3Is an active component. CN101234345A discloses a denitration catalyst, which takes aluminum-based ceramic as a carrier and active Al2O3As a second carrier, CeO2Adding a proper amount of metal oxide as an active component. CN101053838A discloses a denitration catalyst, which takes cordierite as a carrier and loads Al2O3After coating, loading CuO as an active component. CN201611002419.6 discloses a preparation method of a denitration catalyst, which comprises performing surface pore expansion by using modified carbon black powder.
In the process of preparing the coating sol or slurry, 2-5% of chemical pore-forming agents such as urea, polyethylene glycol and the like are generally added, so that the number of pore channels of the surface coating is increased, the specific surface area is increased, the denitration reaction is facilitated, and fly ash in flue gas, ammonium bisulfate generated in the reaction and the like are continuously deposited in the pore channels to block the pore channels, and finally the catalyst is inactivated. Therefore, the amount of macropores in the coating is further increased, the reaction space of the catalyst and the capability of resisting fly ash and salt poisoning can be improved, the mechanical strength of the catalyst coating is certainly influenced by the increase of the amount of macropores, and meanwhile, the distribution of macropores of the alumina obtained by the mode of adding the pore-forming agent through mechanical mixing is not uniform. How to obtain an alumina coating with a certain amount of macropores, uniform distribution and good mechanical strength is a technical problem to be solved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the preparation method of the denitration catalyst, the denitration catalyst coating prepared by the method contains more macropores, the macropores are uniformly distributed, a certain mechanical strength can be ensured, the denitration catalyst has good denitration activity, the preparation process is simple, and the method is suitable for industrial application.
The preparation method of the denitration catalyst comprises the following steps:
(1) uniformly dispersing boehmite powder in water to obtain a boehmite suspension, slowly adding a peptizing agent into the boehmite powder suspension, and after the addition is finished, heating and aging for a certain time to obtain clear alumina sol;
(2) uniformly mixing inorganic aluminum salt, polyethylene glycol, the alumina sol obtained in the step (1), an amide compound and a low-carbon alcohol aqueous solution, then adding propylene oxide and/or pyridine, and uniformly mixing;
(3) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment, taking out, blowing off residual liquid, aging for a period of time, soaking an aging product by using a low-carbon alcohol aqueous solution, then carrying out solid-liquid separation, and drying and roasting a solid phase to obtain a cordierite honeycomb ceramic carrier loaded with a coating;
(4) and (4) impregnating the carrier obtained in the step (3) with an impregnation liquid containing an active component, drying and roasting to obtain a final product.
In the method, the solid content of the suspension liquid in the step (1) is 1-15 wt%.
In the method, the step (1) is carried out under the condition of stirring, and the aging is carried out in a heating reflux mode, wherein the reflux temperature is 70-95 ℃, and the reflux time is 1-12 hours.
In the method, the peptizing agent in the step (1) is a commonly used peptizing agent in the preparation process of the aluminum sol, and can be one or more of hydrochloric acid, nitric acid, sulfuric acid, formic acid or acetic acid. The peptizing agent (the dosage of which is H contained in the peptizing agent) in the step (1)+Calculated) with boehmite powder (in an amount calculated on the basis of Al contained)+The mol ratio of Al to Al is 0.05-1.
In the method, based on the weight of the mixture obtained in the step (2), the adding amount of the lower alcohol aqueous solution is 10-80 wt%, the adding amount of the inorganic aluminum salt is 5-30 wt%, the adding amount of the aluminum sol is 1-10 wt%, and the adding amount of the polyethylene glycol is 0.1-3.0 wt%, preferably 0.2-2.0 wt%; wherein the mass ratio of water to the low-carbon alcohol in the low-carbon alcohol aqueous solution is 1.0-1.5; the addition amount of the amide compound is 0.1-5.0 wt%. Wherein the viscosity average molecular weight of the polyethylene glycol is 10000-.
In the method of the present invention, the inorganic aluminum salt in step (2) is one or more of aluminum nitrate, aluminum chloride or aluminum sulfate.
In the process of the present invention, the lower alcohol used in the steps (2) and (3) is generally C5The alcohol is preferably one or more of methanol, ethanol, n-propanol and isopropanol, and most preferably ethanol and/or propanol.
In the method, the amide compound in the step (2) is one or more of formamide, acetamide, N-dimethylformamide, N-methylacetamide, benzamide and 2-phenylacetamide.
In the method of the present invention, the propylene oxide and/or pyridine and Al described in the step (2)3+(not including Al in the alumina sol) in a molar ratio of 1.5 to 9.5, preferably 3.0 to 7.5. The propylene oxide and pyridine may be mixed in any proportion.
In the method, the treatment time in the step (3) is 1-120 minutes, preferably 3-60 minutes, and after the treatment time is taken out, the redundant liquid in the gaps of the matrix is blown off by compressed air.
In the method of the invention, the aging conditions in the step (3) are as follows: aging at 20-80 deg.C for 12-120 hr.
In the method, the soaking conditions in the step (3) are as follows: the soaking temperature is 10-80 ℃, and the soaking time is 12-60 hours.
In the method, the mass concentration of the low-carbon alcohol aqueous solution used for soaking in the step (3) is not less than 50 wt%; after soaking treatment, taking out the substrate, and blowing off redundant liquid in gaps of the substrate by using compressed air.
In the method, the drying in the step (3) is ordinary normal pressure drying, the drying temperature is not more than 120 ℃, preferably 20-100 ℃, and the drying is carried out until the product is not obviously reduced. The roasting is carried out at 400-700 ℃ for 1-24 hours, preferably at 500-650 ℃ for 2-12 hours.
In the method, the pore diameter of the coating macropore in the step (3) is 50-1000nm, preferably 100-500 nm, the pores are uniformly distributed and are communicated in a three-dimensional way, and the ratio of the pore diameter of the macropore to the corresponding wall thickness is 0.5-4.5, preferably 1-4.
In the method of the invention, the solid-liquid separation can adopt conventional modes such as filtration, centrifugation and the like.
In the method of the present invention, the pretreated cordierite honeycomb ceramic substrate is an acid-treated activated cordierite honeycomb ceramic substrate.
In the method, the active component in the step (4) is one or more of Co, Ni, Mo, W, Fe, Cu, Mn, Zn, La, Ce, V or Ti.
In the method of the invention, the impregnation process in the step (4) adopts a method of over-volume impregnation, equal-volume impregnation or spray impregnation and the like, the impregnation time is 1-5 hours, and the over-volume impregnation is preferred. Wherein, the preparation of the impregnating solution selects soluble compounds of active components, and the specific concentration of the impregnating solution can be determined according to the content of active metals on the final catalyst.
In the method, the roasting temperature in the step (4) is 400-600 ℃, preferably 500-600 ℃, the roasting time is 2-10 hours, and the roasting is carried out in an oxygen-containing atmosphere, generally an air atmosphere.
In the method of the invention, the drying temperature in the step (4) is 60-150 ℃, preferably 80-120 ℃, the drying time is 3-12 hours, preferably 6-10 hours,
in the method, the mixing process adopts modes of stirring, ultrasound or high shear and the like.
The application of the denitration catalyst in flue gas denitration generally has the following better process conditions: the temperature is 180-500 ℃, and the reaction space velocity is 4000-10000 h-1，NOxThe concentration is 500-1500 ppm, SO20 to 500ppm in terms of concentration, O22-3% of volume content, H2The volume content of O is 0-10%.
Compared with the prior art, the denitration catalyst has the following characteristics:
the alumina coating is prepared in situ on the honeycomb substrate, the coating obtains three-dimensionally through and uniformly distributed macropores through the sol-gel reaction characteristic of inorganic aluminum salt, the addition of the amide compound can inhibit the generation of super macropores, so that the macropores are more uniformly concentrated, and the stress effect caused by nonuniform pore sizes is favorably eliminated. The denitration catalyst has better mass transfer efficiency of flue gas denitration, the pore channel of the catalyst is not easy to be blocked by fly ash and sulfate, and the service life of the catalyst is prolonged.
Drawings
FIG. 1 is an electron microscope image of the alumina coating prepared in example 1.
Fig. 2 is an electron microscope image of the alumina coating prepared in comparative example 1.
Detailed Description
The technical solution of the present invention is described in more detail by the following specific examples, and the examples should not be construed as limiting the scope of the present invention. The cordierite honeycomb ceramics used in the examples were square carriers each having a cross section of 50mm in length, width and height. And observing the coating macropore and the three-dimensional penetration condition thereof by using a scanning electron microscope. The crystalline state was tested by XRD. The average pore diameter of the macropores of the coating is characterized and tested by mercury intrusion method. The boehmite powder is a product sold in the market or manufactured by self.
Cordierite pretreatment: completely immersing cordierite honeycomb ceramic into 5wt% nitric acid solution for 1 hour, taking out, washing with deionized water for 3-5 times, placing into an oven, and drying for 10 hours at 130 ℃ to obtain the cordierite honeycomb ceramic carrier with the activated surface.
The preparation of the active ingredient impregnation solution is well known to those skilled in the art, and generally a soluble compound of the active ingredient, usually a nitrate, is selected, and the specific concentration of the impregnation solution can be determined according to the active metal content on the final catalyst.
Example 1
(1) Mixing boehmite powder and water to form a suspension (solid content is 3 wt%), dropwise adding hydrochloric acid under the stirring condition, wherein the acid/aluminum molar ratio is 0.07, and after dropwise adding, heating to 85 ℃ and refluxing for 5 hours to form clear alumina sol;
(2) uniformly mixing water, absolute ethyl alcohol, aluminum chloride, polyethylene glycol, aluminum sol and formamide at room temperature (about 25 ℃), and then adding pyridine, wherein the mixture comprises the following components in parts by weight: 22% of water, 21% of ethanol, 18% of aluminum chloride, 0.3% of polyethylene glycol (with the viscosity average molecular weight of 100 ten thousand), 5% of alumina sol, 1% of formamide and 32.7% of pyridine, and uniformly mixing;
(3) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment for 10 minutes, taking out, blowing off residual liquid, continuing aging for 48 hours at 40 ℃, soaking the aged mixture for 48 hours by using 55wt% of ethanol water solution, blowing off the residual liquid after the soaking is finished, drying at 40 ℃ until the product is not obviously reduced, and then roasting for 3 hours at 550 ℃ to obtain a carrier loaded with a coating; the average pore diameter of macropores of the coated alumina is 440nm, the macropores are uniformly distributed and are communicated in a three-dimensional way, and the ratio of the pore diameter of the macropores to the corresponding wall thickness is 0.7;
(4) and (3) impregnating the cordierite honeycomb ceramic matrix obtained in the step (3) with an impregnation solution containing Mn and Fe active components, drying at 120 ℃ for 8 hours, and roasting the dried material at 550 ℃ for 5 hours in an air atmosphere to obtain a catalyst A, wherein the loading amount of Mn in the catalyst is 8wt%, and the loading amount of Fe in the catalyst is 2 wt%.
Example 2
(1) The same as in example 1.
(2) Uniformly mixing water, absolute ethyl alcohol, aluminum chloride, polyethylene glycol, aluminum sol and acetamide at room temperature (about 25 ℃), and then adding propylene oxide, wherein the mixture comprises the following components in parts by weight: 23% of water, 20% of ethanol, 22% of aluminum chloride, 0.5% of polyethylene glycol (viscosity-average molecular weight is 100 ten thousand), 2% of alumina sol, 2.0% of formamide and 30.5% of propylene oxide, and uniformly mixing;
(3) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment for 10 minutes, taking out, blowing off residual liquid, continuing aging for 48 hours at 40 ℃, soaking the aged mixture for 48 hours with ethanol, blowing off the residual liquid after the soaking is finished, drying at 40 ℃ until the product is not obviously reduced any more, and then roasting for 5 hours at 450 ℃ to obtain a carrier loaded with a coating; the average pore diameter of macropores of the coated alumina is 210nm, the macropores are uniformly distributed and are communicated in a three-dimensional way, and the ratio of the pore diameter of the macropores to the corresponding wall thickness is 1.5;
(4) and (3) impregnating the cordierite honeycomb ceramic matrix obtained in the step (3) with an impregnation solution containing Mn and Fe active components, drying at 110 ℃ for 8 hours, and roasting the dried material at 550 ℃ for 6 hours in an air atmosphere to obtain a catalyst B, wherein the loading amount of Mn in the catalyst is 10wt%, and the loading amount of Fe in the catalyst is 3 wt%.
Example 3
(1) Mixing boehmite powder and distilled water to form a suspension (solid content is 1.5 wt%), dropwise adding acetic acid under the condition of continuous stirring to meet the acid/aluminum molar ratio of 0.1, and heating to 90 ℃ after the dropwise adding is finished, and refluxing for 10 hours to form clear sol;
(2) uniformly mixing water, absolute ethyl alcohol, aluminum chloride, polyethylene glycol, aluminum sol and N, N-dimethylformamide at room temperature (about 25 ℃), and then adding pyridine, wherein the mixture comprises the following components in parts by weight: 20% of water, 20% of ethanol, 22% of aluminum chloride, 0.5% of polyethylene glycol (viscosity-average molecular weight is 100 ten thousand), 5% of alumina sol, 2.5% of formamide and 30.0% of pyridine, and the components are uniformly mixed;
(3) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment for 10 minutes, taking out, blowing off residual liquid, continuing aging for 48 hours at 40 ℃, soaking the aged mixture for 48 hours with ethanol, blowing off the residual liquid after the soaking is finished, drying at 40 ℃ until the product is not obviously reduced any more, and then roasting for 3 hours at 700 ℃ to obtain a carrier loaded with a coating; the average pore diameter of macropores of the coated alumina is 184nm, the macropores are uniformly distributed and are communicated in a three-dimensional way, and the ratio of the pore diameter of the macropores to the corresponding wall thickness is 1.2;
(4) and (3) impregnating the cordierite honeycomb ceramic matrix obtained in the step (3) with an impregnating solution containing Mn and Ce active components, drying at 120 ℃ for 10 hours, and roasting the dried material at 500 ℃ for 8 hours in an air atmosphere to obtain a catalyst C, wherein the loading amount of Mn in the catalyst is 5wt%, and the loading amount of Ce in the catalyst is 2 wt%.
Comparative example 1
(1) Mixing boehmite powder and water to form a suspension (solid content is 3 wt%), dropwise adding hydrochloric acid under the stirring condition, wherein the acid/aluminum molar ratio is 0.07, and after dropwise adding, heating to 85 ℃ and refluxing for 5 hours to form clear alumina sol;
(2) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment for 10 minutes, taking out, blowing off residual liquid, continuing aging for 48 hours at 40 ℃, soaking the aged mixture for 48 hours by using 55wt% of ethanol water solution, blowing off the residual liquid after the soaking is finished, drying at 40 ℃ until the product is not obviously reduced, and then roasting for 3 hours at 550 ℃ to obtain a carrier loaded with a coating; no obvious macroporous distribution of the coated alumina;
(3) and (3) impregnating the cordierite honeycomb ceramic matrix obtained in the step (3) with an impregnation solution containing Mn and Fe active components, drying at 120 ℃ for 8 hours, and roasting the dried material at 550 ℃ for 5 hours in an air atmosphere to obtain a catalyst D, wherein the loading amount of Mn in the catalyst is 8wt%, and the loading amount of Fe in the catalyst is 2 wt%.
Comparative example 2
(1) The same as example 1;
(2) adding 5wt% of carbon black powder into the alumina sol obtained in the step (1), and uniformly mixing the alumina sol and the carbon black powder by taking the mass of the alumina sol as a reference to obtain coating slurry;
(3) immersing the pretreated cordierite honeycomb ceramic substrate into the coating slurry for 10 minutes, taking out, blowing off residual liquid, drying at 120 ℃ for 9 hours, and then treating at 450 ℃ for 5 hours to obtain the cordierite honeycomb ceramic substrate loaded with the coating; the macropores of the coated alumina are not uniformly distributed and are not three-dimensionally communicated;
(4) catalyst E was obtained in the same manner as in example 1.
Example 4
The denitration catalysts A-E are subjected to activity evaluation, and the simulated flue gas comprises the following components: NOxConcentration of 800ppm, O2Is 2.5% by volume, SO2The concentration is 200ppm, the dust content is 400mg/Nm3. The evaluation conditions were: NH (NH)3/NOx1.5:1 (molar ratio) and the space velocity of 2000-8000 h-1The reaction temperature is 200 ℃ and NOxThe removal effect is shown in table 1; the air speed is 4000h at the reaction temperature of 220 DEG C-1The results of the long cycle run are shown in Table 2.
TABLE 1200 ℃ Activity evaluation results.
TABLE 2220 ℃ long run test results.
Through test comparison, the catalyst disclosed by the invention is high in removal efficiency of nitrogen oxides in flue gas and has good denitration activity. After the catalyst is continuously operated for 500 hours, the high denitration efficiency is still maintained, which shows that the catalyst is not easy to block, has good stability and long operation life.
Claims (12)
1. A preparation method of a denitration catalyst comprises the following steps: (1) uniformly dispersing boehmite powder in water to obtain a boehmite suspension, slowly adding a peptizing agent into the boehmite powder suspension, and after the addition is finished, heating and aging for a certain time to obtain clear alumina sol; (2) uniformly mixing inorganic aluminum salt, polyethylene glycol, the alumina sol obtained in the step (1), an amide compound and a low-carbon alcohol aqueous solution, then adding propylene oxide and/or pyridine, and uniformly mixing; (3) immersing the pretreated cordierite honeycomb ceramic substrate into the mixture obtained in the step (2) for treatment, taking out, blowing off residual liquid, aging for a period of time, soaking an aging product by using a low-carbon alcohol aqueous solution, then carrying out solid-liquid separation, and drying and roasting a solid phase to obtain a cordierite honeycomb ceramic carrier loaded with a coating; (4) and (4) impregnating the carrier obtained in the step (3) with an impregnation liquid containing an active component, drying and roasting to obtain a final product.
2. The method of claim 1, wherein: the solid content of the boehmite suspension in the step (1) is 1-15 wt%.
3. The method of claim 1, wherein: the step (1) is carried out under the condition of stirring, and the aging is carried out in a heating reflux mode, wherein the reflux temperature is 70-95 ℃, and the reflux time is 1-12 hours.
4. The method of claim 1, wherein: the peptizing agent in the step (1) is one or more of hydrochloric acid, nitric acid, sulfuric acid, formic acid or acetic acid; the peptizing agent is used in the amount of H+The mole ratio of the boehmite powder to the amount of the boehmite powder is 0.05-1 in terms of Al contained.
5. The method of claim 1, wherein: based on the weight of the mixture obtained in the step (2), the adding amount of the lower alcohol aqueous solution is 10-80 wt%, the adding amount of the inorganic aluminum salt is 5-30 wt%, the adding amount of the aluminum sol is 1-10 wt%, and the adding amount of the polyethylene glycol is 0.1-3.0 wt%; the addition amount of the amide compound is 0.1-5.0 wt%; the mass ratio of water to the low-carbon alcohol in the low-carbon alcohol aqueous solution is 1.0-1.5; the viscosity average molecular weight of polyethylene glycol is 10000-.
6. The method of claim 1, wherein: the lower alcohol in the steps (2) and (3) is C5The following alcohols.
7. The method of claim 1, wherein: the amide compound in the step (2) is one or more of formamide, acetamide, N-dimethylformamide, N-methylacetamide, benzamide or 2-phenylacetamide.
8. The method of claim 1, wherein: the propylene oxide and/or pyridine and Al in the step (2)3+Is 1.5 to 9.5, and does not contain Al in the alumina sol.
9. The method of claim 1, wherein: and (4) the treatment time in the step (3) is 1-120 minutes, and after the treatment time is taken out, the redundant liquid in the gaps of the matrix is blown off by compressed air.
10. The method of claim 1, wherein: the aging condition in the step (3) is as follows: aging at 20-80 deg.C for 12-120 hr.
11. The method of claim 1, wherein: the soaking conditions in the step (3) are as follows: the soaking temperature is 10-80 ℃, and the soaking time is 12-60 hours; the mass concentration of the low-carbon alcohol aqueous solution used for soaking is not less than 50 wt%; after soaking treatment, taking out the substrate, and blowing off redundant liquid in gaps of the substrate by using compressed air.
12. The method of claim 1, wherein: and (4) the active component is one or more of Co, Ni, Mo, W, Fe, Cu, Mn, Zn, La, Ce, V or Ti.
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| CN114433056A (en) * | 2022-01-26 | 2022-05-06 | 浙江科卓环保科技有限公司 | Preparation method of wide-temperature-zone honeycomb type SCR denitration catalyst |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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