CN111545048A - Catalytic decomposition formaldehyde material and three-dimensional cavity formaldehyde purification filter core prepared from same - Google Patents
Catalytic decomposition formaldehyde material and three-dimensional cavity formaldehyde purification filter core prepared from same Download PDFInfo
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- CN111545048A CN111545048A CN202010357012.5A CN202010357012A CN111545048A CN 111545048 A CN111545048 A CN 111545048A CN 202010357012 A CN202010357012 A CN 202010357012A CN 111545048 A CN111545048 A CN 111545048A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- 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
- B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/03—Catalysts comprising molecular sieves not having base-exchange properties
- B01J29/0308—Mesoporous materials not having base exchange properties, e.g. Si-MCM-41
- B01J29/0341—Mesoporous materials not having base exchange properties, e.g. Si-MCM-41 containing arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/83—Aluminophosphates (APO compounds)
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
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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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
Abstract
The invention discloses a material for catalytically decomposing formaldehyde and a three-dimensional cavity formaldehyde purification filter element prepared from the material, which comprises a purifier carrier and a material for catalytically decomposing formaldehyde and ammonia gas, wherein the material for catalytically decomposing formaldehyde and ammonia gas is arranged in the carrier and consists of the following raw materials: the preparation method comprises the following steps of preparing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles, wherein the preparation method of the manganese oxide fiber microspheres comprises the following steps: the filter element is added with the molecular sieve, so that prepared mesoporous zeolite particles can be well ensured to be loose so as to avoid blocking pore channels of a ceramic membrane, in addition, the zeolite and titanium oxide with strong binding force are attached to nano silver particles, and the formaldehyde decomposition performance is remarkably improved.
Description
Technical Field
The invention relates to the technical field of formaldehyde decomposing materials, in particular to a catalytic formaldehyde decomposing material and a three-dimensional cavity formaldehyde purifying filter element prepared from the catalytic formaldehyde decomposing material.
Background
Formaldehyde is a highly toxic substance, and is the second place on the priority control list of toxic chemicals in china. Formaldehyde has been identified by the world health organization as a carcinogenic and teratogenic substance, a recognized source of allergy, and also as one of the potentially strong mutagens. Research shows that formaldehyde has strong carcinogenic and carcinogenic effects. The influence of formaldehyde on human health is mainly manifested in abnormal sense of smell, irritation, allergy, lung function, liver function and immune function. Currently, photocatalytic oxidation technology is the most ideal method for removing formaldehyde. The method is a process for catalyzing formaldehyde and oxygen to react to generate nontoxic carbon dioxide and water by using a catalyst. The technology has the advantages of high formaldehyde elimination efficiency, low relative cost, no secondary pollution, no adsorption saturation and other problems, has more obvious treatment effect on low-concentration formaldehyde pollution, and is a research hotspot for treating indoor formaldehyde pollution at present. However, the problems of the photocatalytic technology are that the photocatalytic effect is low, and the problems that the catalyst loss is easy to occur in the commonly used supported catalyst in the prior art, and the like, so that a material for catalytically decomposing formaldehyde and a three-dimensional cavity formaldehyde purification filter element prepared from the material are needed.
Disclosure of Invention
The invention aims to provide a material for catalytically decomposing formaldehyde and a three-dimensional cavity formaldehyde purification filter element prepared from the material, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
a material for catalytically decomposing formaldehyde is prepared by the following steps:
s1: mixing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles to prepare an acidic solution, an alkaline solution and a silver nitrate solution;
s2: sequentially carrying out pugging, extrusion forming, drying and roasting on the mixture obtained in the step S1 to obtain a tubular carrier;
s3: soaking, acid washing, alkali washing, water washing and drying the tubular carrier obtained in the step S2;
s4: immersing the tubular carrier processed in the step S3 into a silver nitrate solution, and heating and evaporating the solution until the solution is completely volatilized;
s5: and (4) washing and drying the tubular carrier obtained in the step S4, and then placing the tubular carrier in a muffle furnace for high-temperature roasting to finally obtain the catalytic decomposition formaldehyde material.
The preparation method of the manganese oxide fiber microspheres comprises the following steps: a. preparing a flexible manganese oxide nanofiber membrane in an electrostatic spinning mode; b. continuously unreeling and feeding the flexible manganese oxide nanofiber membrane into a conical cabin, gathering the flexible manganese oxide nanofiber membrane by a twisting device in the conical cabin, and twisting the flexible manganese oxide nanofiber membrane into manganese oxide fibers; c. and cutting the manganese oxide fiber, putting the cut manganese oxide fiber into a spherical cabin body, and extruding to obtain the manganese oxide microsphere.
As a further scheme of the invention: the mass ratio of the manganese oxide fiber microspheres to the submicron alumina powder to the nanoscale titanium dioxide powder to the mesoporous molecular sieve particles is 20: 100: 10-40: 2-5.
As a further scheme of the invention: the acid solution is one or a mixed solution of a hydrochloric acid solution and a nitric acid solution, and the alkaline solution is one or a mixed solution of a sodium hydroxide solution and a potassium hydroxide solution.
As a further scheme of the invention: the mesoporous molecular sieve particles are one of silicoaluminophosphates formed after partial P in the aluminophosphate-based molecular sieve material is replaced by Si, aluminophosphates with divalent metals introduced into the framework and MCM-41/SAP0-34/SBA-16 of full silicon.
As a further scheme of the invention: in the step S5, the roasting temperature of the muffle furnace is 500-700 ℃, and the roasting time is 2-5 h.
The utility model provides a three-dimensional cavity formaldehyde purification filter core, includes the bottom plate, the fixed filter box that is provided with of bottom plate up end, the filter box up end is provided with the end cover, be provided with air intlet in the middle of the end cover up end, the filter box surface is provided with a plurality of gas outlets, be provided with filter element group spare in the filter box, filter element group spare intussuseption is filled with the filter core, the filter core be above-mentioned arbitrary catalytic decomposition formaldehyde material.
As a further scheme of the invention: the filter element assembly comprises a filter cylinder, an upper annular plate is fixedly connected to the upper end face of the filter cylinder, a lower annular plate is fixedly connected to the lower end face of the filter cylinder, an annular screen plate is fixedly connected between the outer ends of the upper annular plate and the lower annular plate, and a filter element is filled between the annular screen plate and the filter cylinder.
As a further scheme of the invention: an air inlet cavity is arranged in the filter cylinder and communicated with an air inlet, and an air pump is arranged in the air inlet cavity.
Compared with the prior art, the invention has the beneficial effects that: the filter element prepared by the invention is added with the molecular sieve, so that the prepared mesoporous zeolite particles can be well ensured to be loose to avoid blocking ceramic membrane pore channels, in addition, the nano silver particles are attached to the zeolite and titanium oxide with strong binding force, the formaldehyde decomposition performance is obviously improved, the filter element assembly prepared by the prepared filter element is installed in the filter box, the installation is convenient, the air flow guiding of an air pump is improved, the formaldehyde removal effect is good, the prepared manganese oxide fiber microspheres have excellent energy storage performance, the formaldehyde removal effect is further enhanced, the formaldehyde removal use time is improved, and the filter element assembly is worthy of popularization.
Drawings
FIG. 1 is a schematic structural diagram of a front view of a catalytic decomposition formaldehyde material and a three-dimensional cavity formaldehyde purification filter element prepared from the catalytic decomposition formaldehyde material;
FIG. 2 is a schematic sectional view of a front view of a formaldehyde material for catalytic decomposition and a three-dimensional cavity formaldehyde purification filter element prepared from the same;
FIG. 3 is a schematic diagram of a top view and a partial structure of a three-dimensional cavity formaldehyde purification filter element prepared from a formaldehyde material for catalytic decomposition.
In the figure: 1-bottom plate, 2-air outlet, 3-end cover, 4-air inlet, 5-filter box, 6-air pump, 7-lower annular plate, 8-annular net plate, 9-upper annular plate, 10-filter cylinder, 11-air inlet cavity, 12-filter element and 13-filter element component.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a technical solution:
the first embodiment is as follows:
a material for catalytically decomposing formaldehyde, comprising the steps of:
s1: mixing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles to prepare an acidic solution, an alkaline solution and a silver nitrate solution;
s2: sequentially carrying out pugging, extrusion forming, drying and roasting on the mixture obtained in the step S1 to obtain a tubular carrier;
s3: soaking, acid washing, alkali washing, water washing and drying the tubular carrier obtained in the step S2;
s4: immersing the tubular carrier processed in the step S3 into a silver nitrate solution, and heating and evaporating the solution until the solution is completely volatilized;
s5: and (4) washing and drying the tubular carrier obtained in the step S4, and then placing the tubular carrier in a muffle furnace for high-temperature roasting to finally obtain the catalytic decomposition formaldehyde material.
The preparation method of the manganese oxide fiber microspheres comprises the following steps: a. preparing a flexible manganese oxide nanofiber membrane in an electrostatic spinning mode; b. continuously unreeling and feeding the flexible manganese oxide nanofiber membrane into a conical cabin, gathering the flexible manganese oxide nanofiber membrane by a twisting device in the conical cabin, and twisting the flexible manganese oxide nanofiber membrane into manganese oxide fibers; c. and cutting the manganese oxide fiber, putting the cut manganese oxide fiber into a spherical cabin body, and extruding to obtain the manganese oxide microsphere.
Wherein the mass ratio of the manganese oxide fiber microspheres to the submicron alumina powder to the nanoscale titanium dioxide powder to the mesoporous molecular sieve particles is 20: 100: 10: 2, the acidic solution is one or a mixed solution of a hydrochloric acid solution and a nitric acid solution, the alkaline solution is one or a mixed solution of a sodium hydroxide solution and a potassium hydroxide solution, the mesoporous molecular sieve particles are one of silicoaluminophosphates formed after partial P in the aluminophosphate-based molecular sieve material is replaced by Si, aluminophosphates with divalent metals introduced into the framework, and all-silicon MCM-41/SAP0-34/SBA-16, the roasting temperature of the muffle furnace in the step S5 is 500 ℃, and the roasting time is 2 hours.
Example two:
a material for catalytically decomposing formaldehyde, comprising the steps of:
s1: mixing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles to prepare an acidic solution, an alkaline solution and a silver nitrate solution;
s2: sequentially carrying out pugging, extrusion forming, drying and roasting on the mixture obtained in the step S1 to obtain a tubular carrier;
s3: soaking, acid washing, alkali washing, water washing and drying the tubular carrier obtained in the step S2;
s4: immersing the tubular carrier processed in the step S3 into a silver nitrate solution, and heating and evaporating the solution until the solution is completely volatilized;
s5: and (4) washing and drying the tubular carrier obtained in the step S4, and then placing the tubular carrier in a muffle furnace for high-temperature roasting to finally obtain the catalytic decomposition formaldehyde material.
The preparation method of the manganese oxide fiber microspheres comprises the following steps: a. preparing a flexible manganese oxide nanofiber membrane in an electrostatic spinning mode; b. continuously unreeling and feeding the flexible manganese oxide nanofiber membrane into a conical cabin, gathering the flexible manganese oxide nanofiber membrane by a twisting device in the conical cabin, and twisting the flexible manganese oxide nanofiber membrane into manganese oxide fibers; c. and cutting the manganese oxide fiber, putting the cut manganese oxide fiber into a spherical cabin body, and extruding to obtain the manganese oxide microsphere.
Wherein the mass ratio of the manganese oxide fiber microspheres to the submicron alumina powder to the nanoscale titanium dioxide powder to the mesoporous molecular sieve particles is 20: 100: 40: 5, the acidic solution is one or a mixed solution of a hydrochloric acid solution and a nitric acid solution, the alkaline solution is one or a mixed solution of a sodium hydroxide solution and a potassium hydroxide solution, the mesoporous molecular sieve particles are one of silicoaluminophosphates formed after partial P in the aluminophosphate-based molecular sieve material is replaced by Si, aluminophosphates with divalent metals introduced into the framework, and all-silicon MCM-41/SAP0-34/SBA-16, the roasting temperature of the muffle furnace in the step S5 is 700 ℃, and the roasting time is 5 hours.
Example three:
a material for catalytically decomposing formaldehyde, comprising the steps of:
s1: mixing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles to prepare an acidic solution, an alkaline solution and a silver nitrate solution;
s2: sequentially carrying out pugging, extrusion forming, drying and roasting on the mixture obtained in the step S1 to obtain a tubular carrier;
s3: soaking, acid washing, alkali washing, water washing and drying the tubular carrier obtained in the step S2;
s4: immersing the tubular carrier processed in the step S3 into a silver nitrate solution, and heating and evaporating the solution until the solution is completely volatilized;
s5: and (4) washing and drying the tubular carrier obtained in the step S4, and then placing the tubular carrier in a muffle furnace for high-temperature roasting to finally obtain the catalytic decomposition formaldehyde material.
The preparation method of the manganese oxide fiber microspheres comprises the following steps: a. preparing a flexible manganese oxide nanofiber membrane in an electrostatic spinning mode; b. continuously unreeling and feeding the flexible manganese oxide nanofiber membrane into a conical cabin, gathering the flexible manganese oxide nanofiber membrane by a twisting device in the conical cabin, and twisting the flexible manganese oxide nanofiber membrane into manganese oxide fibers; c. and cutting the manganese oxide fiber, putting the cut manganese oxide fiber into a spherical cabin body, and extruding to obtain the manganese oxide microsphere.
Wherein the mass ratio of the manganese oxide fiber microspheres to the submicron alumina powder to the nanoscale titanium dioxide powder to the mesoporous molecular sieve particles is 20: 100: 30: 4, the acidic solution is one or a mixed solution of a hydrochloric acid solution and a nitric acid solution, the alkaline solution is one or a mixed solution of a sodium hydroxide solution and a potassium hydroxide solution, the mesoporous molecular sieve particles are silicoaluminophosphates formed after partial P in the aluminophosphate-based molecular sieve material is replaced by Si, aluminophosphates with divalent metals introduced into the framework, and the roasting temperature of a muffle furnace in a step S5 of one of all-silicon MCM-41/SAP0-34/SBA-16 is 600 ℃, and the roasting time is 4 hours.
A three-dimensional cavity formaldehyde purification filter element comprises a bottom plate 1, wherein a filter box 5 is fixedly arranged on the upper end face of the bottom plate 1, an end cover 3 is arranged on the upper end face of the filter box 5, an air inlet 4 is arranged in the middle of the upper end face of the end cover 3, a plurality of air outlets 2 are arranged on the outer surface of the filter box 5, a filter element assembly 13 is arranged in the filter box 5, a filter element 12 is filled in the filter element assembly 13, the filter element 12 is made of any one of the catalytic decomposition formaldehyde materials, the filter element assembly 13 comprises a filter cylinder 10, an upper annular plate 9 is fixedly connected on the upper end face of the filter cylinder 10, a lower annular plate 7 is fixedly connected on the lower end face of the filter cylinder 10, an annular mesh plate 8 is fixedly connected between the outer ends of the upper annular plate 9 and the lower annular plate 7, a filter element 12 is filled between the annular mesh plate 8 and, an air pump 6 is arranged in the air inlet cavity 11.
The prepared filter element 12 is placed in a filter box 5, an upper end cover 3 is covered, an air pump 6 is opened, the input end of the air pump 6 is communicated with an air inlet 4, the air pump 6 sucks air into an air inlet cavity 11, the air sequentially passes through a filter cylinder 10, the filter element 12 and an annular screen plate 8, formaldehyde in the air is removed through the filter element, finally the air is discharged from an air outlet 2, three-dimensional filter element formaldehyde removing operation is achieved, the same amount of filter elements prepared in the first embodiment, the second embodiment and the third embodiment are respectively weighed and placed in the three-dimensional cavity formaldehyde purification filter element, a formaldehyde one-hour removal rate test is carried out according to GB/T18801-2008 'clean air volume experiment method for gaseous pollutants', the formaldehyde one-hour removal rate is 95%, 96% and 99%, and the formaldehyde removing effect is excellent.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A formaldehyde catalytic decomposition material is characterized in that: the preparation method comprises the following steps:
s1: mixing manganese oxide fiber microspheres, submicron-grade alumina powder, nanoscale titanium dioxide powder and mesoporous molecular sieve particles to prepare an acidic solution, an alkaline solution and a silver nitrate solution;
s2: sequentially carrying out pugging, extrusion forming, drying and roasting on the mixture obtained in the step S1 to obtain a tubular carrier;
s3: soaking, acid washing, alkali washing, water washing and drying the tubular carrier obtained in the step S2;
s4: immersing the tubular carrier processed in the step S3 into a silver nitrate solution, and heating and evaporating the solution until the solution is completely volatilized;
s5: washing and drying the tubular carrier obtained in the step S4, and then placing the tubular carrier in a muffle furnace for high-temperature roasting to finally obtain a catalytic decomposition formaldehyde material;
the preparation method of the manganese oxide fiber microspheres comprises the following steps: a. preparing a flexible manganese oxide nanofiber membrane in an electrostatic spinning mode; b. continuously unreeling and feeding the flexible manganese oxide nanofiber membrane into a conical cabin, gathering the flexible manganese oxide nanofiber membrane by a twisting device in the conical cabin, and twisting the flexible manganese oxide nanofiber membrane into manganese oxide fibers; c. and cutting the manganese oxide fiber, putting the cut manganese oxide fiber into a spherical cabin body, and extruding to obtain the manganese oxide microsphere.
2. The material for catalytic decomposition of formaldehyde according to claim 1, wherein: the mass ratio of the manganese oxide fiber microspheres to the submicron alumina powder to the nanoscale titanium dioxide powder to the mesoporous molecular sieve particles is 20: 100: 10-40: 2-5.
3. The material for catalytic decomposition of formaldehyde according to claim 2, wherein: the acid solution is one or a mixed solution of a hydrochloric acid solution and a nitric acid solution, and the alkaline solution is one or a mixed solution of a sodium hydroxide solution and a potassium hydroxide solution.
4. The material for catalytic decomposition of formaldehyde according to claim 3, wherein: the mesoporous molecular sieve particles are one of silicoaluminophosphates formed after partial P in the aluminophosphate-based molecular sieve material is replaced by Si, aluminophosphates with divalent metals introduced into the framework and MCM-41/SAP0-34/SBA-16 of full silicon.
5. The material for catalytic decomposition of formaldehyde according to claim 4, wherein: in the step S5, the roasting temperature of the muffle furnace is 500-700 ℃, and the roasting time is 2-5 h.
6. The utility model provides a three-dimensional cavity formaldehyde purification filter core, includes bottom plate (1), its characterized in that: the catalytic decomposition formaldehyde material is characterized in that a filter box (5) is fixedly arranged on the upper end face of the base plate (1), an end cover (3) is arranged on the upper end face of the filter box (5), an air inlet (4) is formed in the middle of the upper end face of the end cover (3), a plurality of air outlets (2) are formed in the outer surface of the filter box (5), a filter element assembly (13) is arranged in the filter box (5), a filter element (12) is filled in the filter element assembly (13), and the filter element (12) is the catalytic decomposition formaldehyde material according to any one of claims 1-5.
7. The formaldehyde purification filter element with the three-dimensional cavity as claimed in claim 6, wherein: the filter element assembly (13) comprises a filter cylinder (10), an upper end face of the filter cylinder (10) is fixedly connected with an upper annular plate (9), a lower end face of the filter cylinder (10) is fixedly connected with a lower annular plate (7), an annular screen plate (8) is fixedly connected between the outer ends of the upper annular plate (9) and the lower annular plate (7), and a filter element (12) is filled between the annular screen plate (8) and the filter cylinder (10).
8. The formaldehyde purification filter element with the three-dimensional cavity as claimed in claim 7, wherein: an air inlet cavity (11) is arranged in the filter cylinder (10), the air inlet cavity (11) is communicated with the air inlet (4), and an air pump (6) is arranged in the air inlet cavity (11).
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Application publication date: 20200818 |