CN111644052A - Novel high-efficiency catalytic formaldehyde material and digital display formaldehyde purifier prepared from same - Google Patents

Novel high-efficiency catalytic formaldehyde material and digital display formaldehyde purifier prepared from same Download PDF

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CN111644052A
CN111644052A CN202010374165.0A CN202010374165A CN111644052A CN 111644052 A CN111644052 A CN 111644052A CN 202010374165 A CN202010374165 A CN 202010374165A CN 111644052 A CN111644052 A CN 111644052A
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manganese oxide
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张宏强
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Jiangsu Zhuogao Environmental Protection Technology Co ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • 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
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    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D53/8668—Removing organic compounds not provided for in B01D53/8603 - B01D53/8665
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
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    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/38—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of titanium, zirconium or hafnium
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    • 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
    • B01J35/51—Spheres
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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
    • B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/112—Metals or metal compounds not provided for in B01D2253/104 or B01D2253/106
    • B01D2253/1124—Metal oxides
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/20707—Titanium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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    • B01D2255/207—Transition metals
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Abstract

The invention discloses a novel high-efficiency catalytic formaldehyde material and a digital display formaldehyde purifier prepared from the same, wherein the novel high-efficiency catalytic formaldehyde material comprises a carrier and a catalytic formaldehyde coating coated on the carrier, the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, and the catalytic formaldehyde coating is prepared from the following raw materials: the high-porosity manganese oxide fiber microspheres, methylglycine proline, an adhesive, nano titanium dioxide, permanganate, distilled water, a defoaming agent and a dispersing agent; the preparation method of the high-porosity manganese oxide fiber microspheres comprises the following steps: the manganese oxide fiber bundle strips are formed by twisting and gathering manganese oxide fiber membranes with the width of 1.5m and randomly distributed internal fibers, and then the manganese oxide fiber bundle strips are cut off and extruded into porous structure nanofiber microspheres. Because a large number of micropores exist on the surface and inside of the high-porosity manganese oxide fiber microsphere in the coating, the high-efficiency catalytic formaldehyde material can quickly adsorb formaldehyde in the air and carry out catalytic decomposition, and the formaldehyde removal rate is high.

Description

Novel high-efficiency catalytic formaldehyde material and digital display formaldehyde purifier prepared from same
Technical Field
The invention relates to the technical field of formaldehyde catalytic materials, in particular to a novel efficient catalytic formaldehyde material and a digital display formaldehyde purifier prepared from the same.
Background
Formaldehyde, also known as formaldehyde. Colorless gas, has special pungent odor, and has stimulating effect on eyes and nose. The main hazard of formaldehyde is manifested by irritation of the skin mucosa. When the formaldehyde reaches a certain concentration indoors, people feel uncomfortable and are more than 0.08m3The formaldehyde concentration can cause redness, itching, discomfort or pain in the throat, hoarseness, sneezing, chest distress, asthma, dermatitis, etc. The newly decorated room has high formaldehyde content and is the main cause of many diseases. Chronic exposure to formaldehyde increases the chances of developing particular cancers such as hodgkin's lymphoma, multiple myeloma, and myeloid leukemia.
Generally speaking, the main sources of indoor formaldehyde are wall coatings, wallpaper, colored coatings, plates, glue, solid wood furniture and the like, and other daily necessities, especially for families with babies, toys and clothes of babies and even bedsheets are likely to exceed the standard of formaldehyde, so that the formaldehyde can continuously exist for a long time in normal life scenes although people cannot see and hear the formaldehyde.
In order to remove formaldehyde contained in air, it is generally necessary to decompose or convert formaldehyde using a formaldehyde catalytic decomposition material in an air cleaner. Although the photocatalyst method in the prior art has a certain removal effect on formaldehyde, the treatment effect and efficiency are still limited; in addition, after the air purifier is used for a long time, the catalytic decomposition material is inevitably adhered with dust, water vapor and other pollutants, bacteria are easy to breed, and the purification of indoor air is not facilitated.
Disclosure of Invention
The invention aims to provide a novel high-efficiency catalytic formaldehyde material and a digital display formaldehyde purifier prepared from the same, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel high-efficiency formaldehyde catalyzing material comprises a carrier and a formaldehyde catalyzing coating coated on the carrier, wherein the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, the composite fabric layer is woven by warps and wefts, the warps are made by compositely twisting cotton fibers, bamboo charcoal fibers and silver fibers, the mass fraction of the cotton fibers is 20-23%, the mass fraction of the bamboo charcoal fibers is 25-28%, and the balance is silver fibers; the weft is prepared by twisting bamboo charcoal fiber and manganese oxide fiber in a composite manner, wherein the mass fraction of the bamboo charcoal fiber is 25-28%, and the balance is the manganese oxide fiber; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 63-67 parts of manganese oxide fiber microspheres, 8-11 parts of methylglycine proline, 22-25 parts of adhesive, 11-15 parts of nano titanium dioxide, 7-9 parts of permanganate, 4-7 parts of oxalate, 35-40 parts of distilled water, 1-3 parts of light stabilizer, 0.5-0.7 part of defoaming agent and 0.3-0.6 part of dispersing agent;
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 permanganate adopts potassium permanganate or sodium permanganate, and the oxalate adopts sodium oxalate or potassium oxalate.
As a further scheme of the invention: the light stabilizer is one or a mixture of more of o-hydroxybenzophenone, benzotriazole, salicylate and triazine.
As a further scheme of the invention: the defoaming agent is one or a mixture of more of lauric acid, palmitic acid, stearic acid and polyoxypropylene glycerol ether.
As a further scheme of the invention: the dispersant is one or more of triethyl hexyl phosphoric acid, sodium dodecyl sulfate or methyl amyl alcohol.
As a further scheme of the invention: the warp yarn comprises 21% of cotton fibers, 27% of bamboo charcoal fibers and the balance of silver fibers; the weft comprises 26% of bamboo charcoal fibers by mass and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 65 parts of manganese oxide fiber microspheres, 9 parts of methylglycine proline, 23 parts of adhesive, 13 parts of nano titanium dioxide, 8 parts of permanganate, 6 parts of oxalate, 37 parts of distilled water, 2 parts of light stabilizer, 0.6 part of defoaming agent and 0.4 part of dispersing agent.
As a further scheme of the invention: the warp yarn comprises 23% of cotton fibers, 28% of bamboo charcoal fibers and the balance of silver fibers; the weft comprises 28 mass percent of bamboo charcoal fibers and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 67 parts of manganese oxide fiber microspheres, 11 parts of methylglycine proline, 25 parts of adhesive, 15 parts of nano titanium dioxide, 9 parts of permanganate, 7 parts of oxalate, 40 parts of distilled water, 3 parts of light stabilizer, 0.7 part of defoaming agent and 0.6 part of dispersing agent.
As a further scheme of the invention: the warp yarn comprises 20% of cotton fibers, 25% of bamboo charcoal fibers and the balance of silver fibers; the weft comprises 25% of bamboo charcoal fibers and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 63 parts of manganese oxide fiber microspheres, 8 parts of methylglycine proline, 22 parts of adhesive, 11 parts of nano titanium dioxide, 7 parts of permanganate, 4 parts of oxalate, 35 parts of distilled water, 1 part of light stabilizer, 0.5 part of defoaming agent and 0.3 part of dispersing agent.
A digital display formaldehyde purifier comprises any one of the novel high-efficiency catalytic formaldehyde material as a filter material for catalytic decomposition of formaldehyde.
Compared with the prior art, the invention has the beneficial effects that: the catalytic formaldehyde coating contains the manganese oxide fiber microspheres, the manganese oxide fiber microspheres contain a large number of microporous structures, the large number of microporous structures are favorable for quickly adsorbing formaldehyde in the air, then, the formaldehyde is further decomposed, and the capability of removing the formaldehyde is greatly improved by matching with the photocatalyst catalysis of the nano titanium dioxide; the bamboo charcoal fiber and the silver fiber in the carrier have good antibacterial effect, dust or other pollutants adhered on the coating are prevented from being easily bred with bacteria, and the purity of indoor air is further ensured by matching with permanganate and oxalate in the coating, and the manganese oxide fiber in the carrier can also participate in catalytic decomposition of formaldehyde; the amino group of the methylglycine proline can be rapidly combined with formaldehyde to generate a hydroxymethyl compound; the rate of reaction with formaldehyde can be further improved by matching with the chitosan quaternary ammonium salt. The high-efficiency catalytic formaldehyde material can quickly adsorb formaldehyde in air for catalytic decomposition, realizes high-efficiency removal of formaldehyde, can effectively resist bacteria, and ensures the purity of indoor air.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.
Example 1:
a novel high-efficiency formaldehyde catalyzing material comprises a carrier and a formaldehyde catalyzing coating coated on the carrier, wherein the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, the composite fabric layer is woven by warps and wefts, the warps are made by compositely twisting cotton fibers, bamboo charcoal fibers and silver fibers, the mass fraction of the cotton fibers is 21%, the mass fraction of the bamboo charcoal fibers is 27%, and the balance is silver fibers; the weft is prepared by twisting bamboo charcoal fibers and manganese oxide fibers in a composite manner, wherein the mass fraction of the bamboo charcoal fibers is 26%, and the balance is the manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 65 parts of manganese oxide fiber microspheres, 9 parts of methylglycine proline, 23 parts of adhesive, 13 parts of nano titanium dioxide, 8 parts of permanganate, 6 parts of oxalate, 37 parts of distilled water, 2 parts of light stabilizer, 0.6 part of defoaming agent and 0.4 part of dispersing agent;
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.
The permanganate adopts potassium permanganate, and the oxalate adopts sodium oxalate. The light stabilizer adopts o-hydroxybenzophenone. The antifoaming agent adopts lauric acid. The dispersing agent adopts triethyl hexyl phosphoric acid.
A digital display formaldehyde purifier comprises the novel high-efficiency catalytic formaldehyde material as a filter material for catalytic decomposition of formaldehyde.
Example 2:
a novel high-efficiency formaldehyde catalyzing material comprises a carrier and a formaldehyde catalyzing coating coated on the carrier, wherein the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, the composite fabric layer is woven by warps and wefts, the warps are made by compositely twisting cotton fibers, bamboo charcoal fibers and silver fibers, the mass fraction of the cotton fibers is 23%, the mass fraction of the bamboo charcoal fibers is 28%, and the balance is silver fibers; the weft is prepared by twisting bamboo charcoal fiber and manganese oxide fiber in a composite manner, wherein the mass fraction of the bamboo charcoal fiber is 28%, and the balance is the manganese oxide fiber; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 67 parts of manganese oxide fiber microspheres, 11 parts of methylglycine proline, 25 parts of adhesive, 15 parts of nano titanium dioxide, 9 parts of permanganate, 7 parts of oxalate, 40 parts of distilled water, 3 parts of light stabilizer, 0.7 part of defoaming agent and 0.6 part of dispersing agent;
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.
The permanganate adopts sodium permanganate, and the oxalate adopts potassium oxalate. The light stabilizer adopts benzotriazoles. The defoaming agent adopts stearic acid. The dispersing agent adopts sodium dodecyl sulfate.
A digital display formaldehyde purifier comprises the novel high-efficiency catalytic formaldehyde material as a filter material for catalytic decomposition of formaldehyde.
Example 3:
a novel high-efficiency formaldehyde catalyzing material comprises a carrier and a formaldehyde catalyzing coating coated on the carrier, wherein the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, the composite fabric layer is woven by warps and wefts, the warps are made by compositely twisting cotton fibers, bamboo charcoal fibers and silver fibers, the mass fraction of the cotton fibers is 20%, the mass fraction of the bamboo charcoal fibers is 25%, and the balance is silver fibers; the weft is prepared by twisting bamboo charcoal fiber and manganese oxide fiber in a composite manner, wherein the mass fraction of the bamboo charcoal fiber is 25%, and the balance is the manganese oxide fiber; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 63 parts of manganese oxide fiber microspheres, 8 parts of methylglycine proline, 22 parts of adhesive, 11 parts of nano titanium dioxide, 7 parts of permanganate, 4 parts of oxalate, 35 parts of distilled water, 1 part of light stabilizer, 0.5 part of defoaming agent and 0.3 part of dispersing agent;
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.
The permanganate adopts potassium permanganate, and the oxalate adopts potassium oxalate. The light stabilizer adopts triazine. The defoaming agent adopts polyoxypropylene glycerol ether. The dispersant adopts methyl amyl alcohol.
A digital display formaldehyde purifier comprises the novel high-efficiency catalytic formaldehyde material as a filter material for catalytic decomposition of formaldehyde.
The materials of each example were tested for their effect on catalytic decomposition of formaldehyde by the following procedure:
1. cutting the high-efficiency catalytic formaldehyde material of the embodiment 1-3 into test blocks with the size of 10cm multiplied by 10cm, selecting some commercial formaldehyde catalytic decomposition filter screen and cutting into comparison blocks with the size of 10cm multiplied by 10 cm;
2. capturing formaldehyde-containing air with 4 sets of plastic bags, extracting the gas in the plastic bags with a sampler, testing the concentration of formaldehyde in the gas using a liquid chromatograph, and recording as C1;
3. the test block and the comparative block of examples 1 to 3 were placed in respective plastic bags, and after irradiation treatment with ultraviolet rays for 20min, the gas in the plastic bags was extracted with a sampler, and the concentration of formaldehyde in the gas was measured with a liquid chromatograph and recorded as C2;
4. and (3) calculating the result: the formaldehyde removal rate was (C1-C2)/C1X 100%, and the results are shown in the following table.
Test example Example 1 Example 2 Example 3 Comparative example
Formaldehyde removal rate (%) 96 94 95 82
The antibacterial effect of the materials of the examples was tested by the following procedure:
1. cutting the high-efficiency catalytic formaldehyde material of the embodiment 1-3 into test blocks with the size of 1cm multiplied by 1cm, selecting a certain type of commercially available formaldehyde catalytic decomposition filter screen and cutting into comparison blocks with the size of 1cm multiplied by 1 cm;
2. respectively dripping 1mL of staphylococcus aureus liquid on the test block and the comparison block of the examples 1-3, recording the colony number as D1, and respectively recording the colony number on the test block and the comparison block as D2 after placing for 20-30 min;
3. and (3) calculating the result: the degerming rate was (D1-D2)/D1X 100%, and the results are shown in the following table.
Test example Example 1 Example 2 Example 3 Comparative example
Percent bacteria removal (%) 100％ 100％ 100％ 1％
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.

Claims (9)

1. The novel high-efficiency formaldehyde catalysis material is characterized by comprising a carrier and a formaldehyde catalysis coating coated on the carrier, wherein the carrier comprises a non-woven fabric layer and a composite fabric layer which are fixed together, and the formaldehyde catalysis coating is prepared from the following raw materials in parts by weight: 63-67 parts of manganese oxide fiber microspheres, 8-11 parts of methylglycine proline, 22-25 parts of adhesive, 11-15 parts of nano titanium dioxide, 7-9 parts of permanganate, 4-7 parts of oxalate, 35-40 parts of distilled water, 1-3 parts of light stabilizer, 0.5-0.7 part of defoaming agent and 0.3-0.6 part of dispersing agent;
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 novel high-efficiency catalytic formaldehyde material as claimed in claim 1, wherein the permanganate is potassium permanganate or sodium permanganate, and the oxalate is sodium oxalate or potassium oxalate.
3. The novel high-efficiency catalytic formaldehyde material as claimed in claim 1, wherein the light stabilizer is one or more of o-hydroxybenzophenone, benzotriazole, salicylate and triazine.
4. The novel high-efficiency catalytic formaldehyde material as claimed in claim 1, wherein the antifoaming agent is one or more selected from lauric acid, palmitic acid, stearic acid, and polyoxypropylene glycerol ether.
5. The novel high-efficiency catalytic formaldehyde material as claimed in claim 1, wherein the dispersant is one or more selected from triethylhexylphosphoric acid, sodium dodecyl sulfate and methylpentanol.
6. The novel efficient catalytic formaldehyde material as claimed in claim 1, wherein the mass fraction of the cotton fiber in the warp is 21%, the mass fraction of the bamboo charcoal fiber is 27%, and the rest is silver fiber; the weft comprises 26% of bamboo charcoal fibers by mass and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 65 parts of manganese oxide fiber microspheres, 9 parts of methylglycine proline, 23 parts of adhesive, 13 parts of nano titanium dioxide, 8 parts of permanganate, 6 parts of oxalate, 37 parts of distilled water, 2 parts of light stabilizer, 0.6 part of defoaming agent and 0.4 part of dispersing agent.
7. The novel efficient catalytic formaldehyde material as claimed in claim 1, wherein the mass fraction of the cotton fiber in the warp is 23%, the mass fraction of the bamboo charcoal fiber is 28%, and the rest is silver fiber; the weft comprises 28 mass percent of bamboo charcoal fibers and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 67 parts of manganese oxide fiber microspheres, 11 parts of methylglycine proline, 25 parts of adhesive, 15 parts of nano titanium dioxide, 9 parts of permanganate, 7 parts of oxalate, 40 parts of distilled water, 3 parts of light stabilizer, 0.7 part of defoaming agent and 0.6 part of dispersing agent.
8. The novel efficient catalytic formaldehyde material as claimed in claim 1, wherein the mass fraction of the cotton fiber in the warp is 20%, the mass fraction of the bamboo charcoal fiber is 25%, and the rest is silver fiber; the weft comprises 25% of bamboo charcoal fibers and the balance of manganese oxide fibers; the catalytic formaldehyde coating is composed of the following raw materials in parts by weight: 63 parts of manganese oxide fiber microspheres, 8 parts of methylglycine proline, 22 parts of adhesive, 11 parts of nano titanium dioxide, 7 parts of permanganate, 4 parts of oxalate, 35 parts of distilled water, 1 part of light stabilizer, 0.5 part of defoaming agent and 0.3 part of dispersing agent.
9. A digital formaldehyde purifier, characterized in that, the novel high-efficiency catalytic formaldehyde material of any one of claims 1 to 8 is used as a filter material for catalytic decomposition of formaldehyde.
CN202010374165.0A 2020-05-06 2020-05-06 Novel high-efficiency catalytic formaldehyde material and digital display formaldehyde purifier prepared from same Withdrawn CN111644052A (en)

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