CN116393123A - Preparation method of non-carbon-based denitration catalyst - Google Patents

Preparation method of non-carbon-based denitration catalyst Download PDF

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CN116393123A
CN116393123A CN202310674202.3A CN202310674202A CN116393123A CN 116393123 A CN116393123 A CN 116393123A CN 202310674202 A CN202310674202 A CN 202310674202A CN 116393123 A CN116393123 A CN 116393123A
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carbon
denitration catalyst
precursor
preparing
based denitration
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黄昆明
方辉
李江荣
李新
张怀民
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Chengdu Daqi Technology Co ltd
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    • 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
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    • 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
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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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
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    • B01J23/8892—Manganese
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    • 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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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2523/00—Constitutive chemical elements of heterogeneous catalysts

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Abstract

The invention belongs to the technical field of denitration, and discloses a preparation method of a non-carbon-based denitration catalyst, which comprises the following steps: blending a carrier powder, a reinforcing phase, an adhesive and water into a slurry; extruding the slurry into a wet blank, and drying to obtain a honeycomb blank; calcining the honeycomb blank, and obtaining a honeycomb carrier after the calcining is completed; preparing an impregnating solution, wherein the impregnating solution contains soluble salts of metal elements in the active components; immersing the honeycomb carrier in an immersion liquid, and drying after the immersion is finished to obtain a first precursor; calcining the first precursor, and obtaining a second precursor loaded with an active component after the completion of the calcination; and immersing the second precursor in deionized water or steaming in water vapor, and drying after the immersing or steaming is finished, thus obtaining the non-carbon-based denitration catalyst with active vacancies. The process is short and controllable, the cost of raw materials is low, the production efficiency is high, and the prepared catalyst has high mechanical strength and good denitration, sulfur resistance and water resistance.

Description

Preparation method of non-carbon-based denitration catalyst
Technical Field
The invention relates to the technical field of denitration, in particular to the technical field of non-carbon-based denitration catalysts, and specifically relates to a preparation method of a non-carbon-based denitration catalyst.
Background
The Selective Catalytic Reduction (SCR) technology has been widely used for the treatment of the atmospheric pollution in China by virtue of the advantages of high denitration efficiency, small occupied area and the like.
The core of SCR technology is a denitration catalyst. In practical operation, the denitration catalyst is usually gradually deactivated due to the increase of the service time, and the main reasons of the deactivation can be classified into physical deactivation and chemical deactivation. The reason for physical deactivation mainly comprises catalyst abrasion or fragmentation caused by fly ash scouring in the flue gas, and fly ash covering and blocking catalyst pores. Chemical poisoning mainly refers to the loss of active components of the catalyst caused by the combination of harmful elements such as alkaline metal, heavy metal and the like in fly ash and the active components of the catalyst, sulfur ammonia corrosion, hydrothermal reasons and the like, so that the denitration activity of the catalyst is reduced. Therefore, the mechanical strength and the poisoning resistance of the catalyst are improved, and the catalyst has important significance for prolonging the service life of the denitration catalyst.
The Chinese patent application with publication number of CN112973668A discloses a high-strength honeycomb low-temperature SCR denitration catalyst and a preparation method thereof, wherein the low-temperature SCR denitration catalyst is obtained by mixing, aging, extrusion molding, roasting and other procedures of titanium dioxide, alumina, fiberglass, ammonium metavanadate solution, ammonium heptamolybdate solution, antimony acetate solution, pseudo-boehmite, kaolin, carboxymethyl cellulose, polyacrylamide, polyethylene oxide, glycerol and nitric acid solution.
The Chinese patent publication No. CN104258856B discloses a preparation method of a porous honeycomb ceramic catalyst with high specific surface area, which is prepared by carrying out six steps of mixing, ageing, kneading, forming, drying, roasting and the like on titanium dioxide, montmorillonite, alpha-alumina, ammonium meta-tungstate, ammonium meta-vanadate, cerium nitrate, palladium acetate, monoethanolamine, ammonia water, lactic acid, stearic acid, glass fiber, high polymer fiber, hydroxypropyl methyl cellulose, polyethylene oxide, citric acid and water.
Although both catalysts are claimed to have good mechanical strength, the preparation process is tedious and complex, the production efficiency is low, the number of chemical components is large, environmental pollution is easy to cause, the chemical reaction is complex, and the preparation process is difficult to control stably. In addition, it is difficult to have good sulfur and water resistance properties because of the very complex chemical composition.
Disclosure of Invention
The invention aims to provide a preparation method of a non-carbon-based denitration catalyst which is simple in raw material composition, environment-friendly, short and controllable in preparation process, and the prepared non-carbon-based denitration catalyst has good denitration performance and sulfur and water resistance.
In order to achieve the above purpose, the invention provides a preparation method of a non-carbon-based denitration catalyst, which comprises the following technical scheme:
the preparation method of the non-carbon-based denitration catalyst comprises the following steps:
preparing a honeycomb carrier:
blending a carrier powder, a reinforcing phase, an adhesive and water into a slurry; extruding the slurry into a wet blank, and drying to obtain a honeycomb blank; calcining the honeycomb blank, and obtaining a honeycomb carrier after the calcining is completed; wherein the reinforcing phase is any one of silica sol, alumina and glass fiber; the adhesive is an organic adhesive;
loading active components:
preparing an impregnating solution, wherein the impregnating solution contains soluble salts of metal elements in the active components; immersing the honeycomb carrier in an immersion liquid, and drying after the immersion is finished to obtain a first precursor; calcining the first precursor, and obtaining a second precursor loaded with an active component after the completion of the calcination;
active vacancies are formed:
and immersing the second precursor in deionized water or steaming in water vapor, and drying after the immersing or steaming is finished, thus obtaining the non-carbon-based denitration catalyst with active vacancies.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the carrier powder is titanium dioxide or metatitanic acid.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the carrier powder adopts nanofiber powder with the diameter of 10-30 nanometers and the length of 500-2000 nanometers.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the weight ratio of the carrier powder, the reinforcing phase and the adhesive is (70-80): (10-20): (1-6); the solid-to-liquid ratio of the slurry is 100: (50-60); the slurry also contains attapulgite and/or ammonium bicarbonate.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the calcination temperature of the honeycomb blank is 500-600 ℃ and the duration is 1.5-4 hours.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the active components are metal oxides of any of manganese, cerium, samarium, chromium, iron, cobalt, germanium and copper.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the honeycomb carrier is immersed in the immersion liquid under ultrasonic treatment.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the impregnating solution also contains hexamethylenetetramine; the impregnating solution also contains soluble salts of metal elements in the auxiliary agent component.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the calcination temperature of the first precursor is 400-600 ℃ and the duration is 3-5 hours.
As a further improvement of the preparation method of the non-carbon-based denitration catalyst, the following is adopted: the second precursor is immersed in deionized water at normal temperature for 40-60 minutes; the second precursor is steamed in water vapor for 15-25 minutes.
The invention has the following advantages:
(1) The raw materials are simple in composition and low in cost: compared with CN112973668A and CN104258856B, the invention has the advantages of simple raw materials, few additives, environment protection and obvious cost reduction.
(2) The process is short and controllable: the invention adopts the mode of forming the carrier first and loading the active component later, which is beneficial to improving the porosity and mechanical strength of the carrier, and can uniformly disperse the active component on the pore surface of the carrier, so that the active component fully plays a role in catalysis; and moreover, a complex mixing and ageing process is not required, so that the production efficiency is remarkably improved.
(3) The mechanical strength is high: according to the invention, the raw material quantity of the carrier is simplified, and the raw material selection and proportion are optimized, so that the honeycomb carrier has good mechanical strength, and physical inactivation can be effectively avoided and reduced. When the carrier powder is metatitanic acid, the metatitanic acid can be converted into titanium dioxide in the calcining process, so that the titanium dioxide is combined with the reinforcing phase in situ, the mechanical strength of the honeycomb carrier is obviously improved, the porosity is obviously improved, and the catalytic performance is improved. When the carrier powder adopts nanofiber powder, the nanofibers and the reinforcing phases are mutually entangled to form a three-dimensional net structure, so that the mechanical strength is high and the air permeability is good.
(4) The denitration performance is good: on the basis of uniformly dispersing the active components on the pore surfaces of the carrier, the invention further increases the active vacancies of the pore surfaces of the catalyst obviously through special dipping or stewing operation, thereby improving the catalytic performance.
(5) The sulfur-resistant water-resistant performance is good: the composition of the honeycomb carrier is very simple, sulfur resistance and water resistance are facilitated, and through verification, the catalytic activity of the catalyst can be reduced slightly when sulfur dioxide and water vapor are introduced, and the catalyst can be quickly recovered after the introduction of the sulfur dioxide and the water vapor is stopped, so that the catalyst has better sulfur resistance and water resistance.
In conclusion, the preparation method of the non-carbon-based denitration catalyst is short and controllable in process, low in raw material cost, environment-friendly, high in production efficiency, high in mechanical strength, good in denitration, sulfur resistance and water resistance, and therefore, the preparation method of the non-carbon-based denitration catalyst has extremely high practicability.
The invention is further described below with reference to the drawings and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which form a part hereof, are shown by way of illustration and not of limitation, and in which are shown by way of illustration and description of the invention.
FIG. 1 is a schematic structural diagram of a catalyst denitration performance evaluation device employed in the present invention.
FIG. 2 is a graph of the water resistance of the catalyst of example 2 of the present invention.
FIG. 3 is a graph showing sulfur resistance of the catalyst of example 8 of the present invention.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Before describing the present invention with reference to the accompanying drawings, it should be noted in particular that:
the technical solutions and technical features provided in the sections including the following description in the present invention may be combined with each other without conflict.
In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
Terms and units in relation to the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of the invention and in the relevant sections are intended to cover a non-exclusive inclusion.
One embodiment of the preparation method of the non-carbon-based denitration catalyst of the present invention comprises the steps of:
(1) Preparing a honeycomb carrier:
blending a carrier powder, a reinforcing phase, an adhesive and water into a slurry; extruding the slurry into a wet blank, and drying to obtain a honeycomb blank; calcining the honeycomb blank, and obtaining a honeycomb carrier after the calcining is completed; wherein the carrier powder is titanium dioxide or meta-titanic acid (formula is H 2 Ti 3 O 7 ) The method comprises the steps of carrying out a first treatment on the surface of the The reinforcing phase is any one of silica sol, alumina and glass fiber; the adhesive is any one of sodium carboxymethyl cellulose (CMC), hydroxypropyl methyl cellulose (HPMC) and Polyacrylamide (PAM);
when the honeycomb body is calcined at 500-600 ℃ for 1.5-4 hours, the meta-titanic acid can be converted into titanium dioxide, and meanwhile, the diffusion effect of the gas generated by the calcination of the honeycomb body can form pores in the honeycomb carrier, so that the porosity is remarkably improved.
When the weight ratio of the carrier powder, reinforcing phase and binder is (70-80): (10-20): (1-6), wherein the solid-to-liquid ratio of the slurry is 100: (50-60), the molding rate of the honeycomb blank is high, and the obtained honeycomb carrier has better porosity and mechanical strength. If it is desired to further increase the porosity, a small amount of attapulgite and/or ammonium bicarbonate may be added to the slurry, but a higher porosity generally results in a decrease in mechanical strength, so that it is preferred to make the weight of attapulgite and/or ammonium bicarbonate 1 to 3% of the weight of the carrier powder.
The carrier powder is preferably nanofiber powder with the diameter of 10-30 nanometers and the length of 500-2000 nanometers, and at this time, nanofibers and reinforcing phases are intertwined into a three-dimensional network structure, so that the porosity can be improved as much as possible on the basis of ensuring the mechanical strength.
The preparation of the nanofiber carrier powder can be, but is not limited to, the following technical scheme: anatase or rutile titanium dioxide powder (0.1-0.6 g), glucose or sodium dodecyl benzene sulfonate (0-0.4 g), naOH (8-16 g) and H 2 O (30 ml) is hydrothermally reacted for 12 to 72 hours at the temperature of between 120 and 200 ℃ to obtain sodium titanate precipitate (the molecular formula is Na 2 Ti 3 O 7 ) The method comprises the steps of carrying out a first treatment on the surface of the Dispersing sodium tri-titanate precipitate in dilute hydrochloric acid solution for acid exchange, centrifuging, and repeatedly washing the precipitate with deionized water to neutrality to obtain nanofiber-like meta-titanic acid; and calcining the meta-titanic acid to obtain the nano-fibrous titanium dioxide.
(2) Loading active components:
preparing an impregnating solution, wherein the impregnating solution contains soluble salts of metal elements in the active components; immersing the honeycomb carrier in an immersion liquid, and drying after the immersion is finished to obtain a first precursor; calcining the first precursor, and obtaining a second precursor loaded with an active component after the completion of the calcination;
the active components are metal oxides of any of manganese, cerium, samarium, chromium, iron, cobalt, germanium and copper. The active ingredient loading is preferably 1.5 to 4% by weight of the honeycomb carrier. The soluble salt is nitrate or acetate.
In order to allow the impregnation liquid to flow into the pores of the honeycomb carrier, the honeycomb carrier is preferably impregnated with the impregnation liquid under ultrasonic treatment.
In order to make the loading of the soluble salt in the impregnating solution on the pore surfaces of the honeycomb carrier more uniform, a small amount of hexamethylenetetramine is preferably added into the impregnating solution so that the mass fraction of hexamethylenetetramine in the impregnating solution is 1-5%.
The component components can improve the denitration catalytic performance of the catalyst to a certain extent, so that the soluble salt of the metal element in the auxiliary component can be added into the impregnating solution, and then the soluble salt of the metal element in the active component is converted into the corresponding metal oxide together in the calcining process. The adjunct component may be, but is not limited to, any of the metal oxides of Zr, ni, la, Y, W, mo. When preparing the impregnating solution, the molar ratio of the metal elements in the active component and the auxiliary component is preferably 1: (0.25-1).
The calcination temperature of the first precursor is 400-600 ℃ and the duration is 3-5 hours.
(3) Active vacancies are formed:
and immersing the second precursor in deionized water or steaming in water vapor, and drying after the immersing or steaming is finished, thus obtaining the non-carbon-based denitration catalyst with active vacancies.
Through dipping and stewing, metal elements which are not strongly combined with the honeycomb carrier can be dissolved out to form active vacancies, so that the catalytic performance and stability are improved. When a steaming mode is adopted, the water vapor can also increase the porosity of the catalyst. Preferably, the second precursor is immersed in deionized water at normal temperature for 40-60 minutes; the second precursor is steamed in water vapor for 15-25 minutes.
The advantageous effects of the present invention are described below by way of specific examples.
Example 1
(1) Preparing a honeycomb carrier:
the weight ratio of carrier powder, reinforcing phase and binder was 75:15: 3. the solid-to-liquid ratio is 100:55, blending carrier powder, reinforcing phase, adhesive and water into slurry; extruding the slurry into a wet blank, and drying to obtain a honeycomb blank; calcining the honeycomb blank at 500 ℃ for 2 hours to obtain a honeycomb carrier; wherein, the carrier powder adopts nano fibrous titanium dioxide with the diameter of 10-30 nanometers and the length of 500-2000 nanometers; the reinforcing phase adopts silica sol; the adhesive adopts HPMC.
(2) Loading active components:
preparing an impregnating solution, wherein the impregnating solution contains nitrate of metal elements in an active component; immersing the honeycomb carrier in an immersion liquid under ultrasonic treatment, and drying after the immersion is finished to obtain a first precursor; calcining the first precursor for 4 hours at 500 ℃ to obtain a second precursor loaded with an active component; the active components are metal oxides of manganese, cerium and samarium, and the molar ratio of elements of manganese, cerium and samarium in the impregnating solution is 6:0.3:0.22; the active component loading was calculated to be 2% of the weight of the honeycomb support by weighing the honeycomb support and the second precursor.
(3) Active vacancies are formed:
and (3) immersing the second precursor in deionized water for 50 minutes, and drying after the immersion or steaming is finished, so as to obtain the non-carbon-based denitration catalyst with active vacancies.
Example 2
Compared with embodiment 1, this embodiment has the following differences: the carrier powder is meta-titanic acid.
Example 3
Compared with embodiment 1, this embodiment has the following differences: the reinforcing phase is alumina and glass fiber, and the weight ratio of the alumina to the glass fiber is 1:1.
Example 4
Compared with embodiment 1, this embodiment has the following differences: the reinforcing phase is silica sol and alumina, and the weight ratio of the silica sol to the alumina is 1:1.
Example 5
Compared with embodiment 1, this embodiment has the following differences: the reinforcing phase is silica sol, alumina and glass fiber, and the weight ratio of the silica sol to the alumina to the glass fiber is 1:1:1.
Example 6
Compared with embodiment 1, this embodiment has the following differences: a small amount of attapulgite was added to the slurry, the weight of the attapulgite being 1.5% of the weight of the carrier powder.
Example 7
Compared with embodiment 1, this embodiment has the following differences: a small amount of hexamethylenetetramine is added into the impregnating solution, and the mass fraction of the hexamethylenetetramine in the impregnating solution is 2%.
Example 8
Compared with embodiment 1, this embodiment has the following differences: the impregnating solution also contains nitrate of metal elements in auxiliary components, wherein the auxiliary components are metal oxides of Ni and W, the element mole ratio of Ni and W is 1:1 when the impregnating solution is prepared, and the mole ratio of the metal elements in the active components and the auxiliary components is 1:0.5.
example 9
Compared with embodiment 1, this embodiment has the following differences: the second precursor was steamed in steam for 15 minutes.
First, the compressive strength of the catalysts of the above 9 examples was tested by the porous ceramic compressive strength test method (GB/T1964-1996). The denitration performance of the catalysts of the above 9 examples was then tested using the catalyst denitration performance evaluation device shown in fig. 1. The test results of compressive strength and denitration performance are shown in table 1.
As shown in FIG. 1, nitrogen, oxygen, NO, SO 2 (used in the sulfur resistance test), and steam (used in the water resistance test) are mixed in a gas mixing bottle to form a mixed gas, wherein the concentration of NO in the mixed gas is 600ppm, the oxygen content is 10%, and the airspeed is 10000h -1 The method comprises the steps of carrying out a first treatment on the surface of the Then, ammonia gas is introduced into the mixed gas according to the proportion of ammonia nitrogen ratio of 1:1, then the mixed gas passes through a reaction bed layer filled with a catalyst, and then the concentration of NO in tail gas passing through the reaction bed layer at different catalytic reaction temperatures (120 ℃, 150 ℃ and 180 ℃) is tested by adopting an infrared flue gas analyzer and is recorded as C NO The NO removal rate was then calculated using the following formula:
NO removal rate =
Figure SMS_1
100%
Figure SMS_2
As shown in table 1, the compressive strength and catalytic performance of the catalyst of example 2 are both better than those of example 1, demonstrating that when the carrier raw material is meta-titanic acid, both compressive strength and catalytic performance can be improved to some extent.
As is clear from comparative examples 1 and examples 3 to 5, when a plurality of reinforcing phases are used in cooperation, a catalyst having both excellent compressive strength and catalytic performance can be obtained.
As is clear from comparative examples 1 and 9, the steam cooking treatment further contributes to the formation of active vacancies and thus to the denitration.
The catalyst of example 2 was further tested for water resistance. FIG. 2 is a graph of the water resistance of the catalyst of example 2.
As shown in fig. 2, the effect of the water vapor on the catalyst is small, the NO removal rate is reduced by about 3% after 5% of the water vapor is introduced, and the denitration activity is quickly raised and exceeds the initial level after the water vapor is disconnected, thus the catalyst exhibits excellent water resistance.
The catalyst of example 8 was further tested for sulfur resistance. FIG. 3 is a graph of sulfur resistance of the catalyst of example 8.
As shown in FIG. 3, after 80ppm of sulfur dioxide is introduced into the mixed gas, the NO removal rate of the catalyst at 150 ℃ is reduced, but still is more than 80%; after 100 hours of operation, the sulfur dioxide is stopped, the NO removal rate is quickly restored to the initial state, and the catalyst shows excellent sulfur resistance, which indicates that the influence of the sulfur dioxide on the catalyst is reversible, and the catalyst is not completely deactivated due to the generation of the thiamine.
The content of the present invention is described above. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. Based on the foregoing, all other embodiments that may be obtained by one of ordinary skill in the art without undue burden are within the scope of the present invention.

Claims (10)

1. The preparation method of the non-carbon-based denitration catalyst is characterized by comprising the following steps of: the method comprises the following steps:
preparing a honeycomb carrier:
blending a carrier powder, a reinforcing phase, an adhesive and water into a slurry; extruding the slurry into a wet blank, and drying to obtain a honeycomb blank; calcining the honeycomb blank, and obtaining a honeycomb carrier after the calcining is completed; wherein the reinforcing phase is any one of silica sol, alumina and glass fiber; the adhesive is an organic adhesive;
loading active components:
preparing an impregnating solution, wherein the impregnating solution contains soluble salts of metal elements in the active components; immersing the honeycomb carrier in an immersion liquid, and drying after the immersion is finished to obtain a first precursor; calcining the first precursor, and obtaining a second precursor loaded with an active component after the completion of the calcination;
active vacancies are formed:
and immersing the second precursor in deionized water or steaming in water vapor, and drying after the immersing or steaming is finished, thus obtaining the non-carbon-based denitration catalyst with active vacancies.
2. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the carrier powder is titanium dioxide or metatitanic acid.
3. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1 or 2, characterized by comprising the steps of: the carrier powder adopts nanofiber powder with the diameter of 10-30 nanometers and the length of 500-2000 nanometers.
4. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1 or 2, characterized by comprising the steps of: the weight ratio of the carrier powder, the reinforcing phase and the adhesive is (70-80): (10-20): (1-6); the solid-to-liquid ratio of the slurry is 100: (50-60); the slurry also contains attapulgite and/or ammonium bicarbonate.
5. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1 or 2, characterized by comprising the steps of: the calcination temperature of the honeycomb blank is 500-600 ℃ and the duration is 1.5-3 hours.
6. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the active components are metal oxides of any of manganese, cerium, samarium, chromium, iron, cobalt, germanium and copper.
7. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the honeycomb carrier is immersed in the immersion liquid under ultrasonic treatment.
8. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the impregnating solution also contains hexamethylenetetramine; the impregnating solution also contains soluble salts of metal elements in the auxiliary agent component.
9. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the calcination temperature of the first precursor is 400-600 ℃ and the duration is 3-5 hours.
10. The method for preparing the non-carbon-based denitration catalyst as claimed in claim 1, wherein: the second precursor is immersed in deionized water at normal temperature for 40-60 minutes; the second precursor is steamed in water vapor for 15-25 minutes.
CN202310674202.3A 2023-06-08 2023-06-08 Preparation method of non-carbon-based denitration catalyst Pending CN116393123A (en)

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