CN114014299A - Method for converting waste mask into CNT (carbon nano tube) through catalytic pyrolysis method - Google Patents
Method for converting waste mask into CNT (carbon nano tube) through catalytic pyrolysis method Download PDFInfo
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- 239000002699 waste material Substances 0.000 title claims abstract description 65
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 239000002041 carbon nanotube Substances 0.000 title claims abstract description 47
- 229910021393 carbon nanotube Inorganic materials 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007233 catalytic pyrolysis Methods 0.000 title claims abstract description 7
- 239000003054 catalyst Substances 0.000 claims abstract description 64
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000000197 pyrolysis Methods 0.000 claims abstract description 21
- 238000002156 mixing Methods 0.000 claims abstract description 18
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 15
- 230000003197 catalytic effect Effects 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000010926 purge Methods 0.000 claims abstract description 7
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 51
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 49
- 229910052742 iron Inorganic materials 0.000 claims description 21
- 229910052759 nickel Inorganic materials 0.000 claims description 19
- -1 polypropylene Polymers 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 10
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 229910000765 intermetallic Inorganic materials 0.000 claims description 4
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 239000000969 carrier Substances 0.000 claims description 2
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 2
- 229920000573 polyethylene Polymers 0.000 claims description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 2
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 2
- 239000004626 polylactic acid Substances 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims 2
- 229910000480 nickel oxide Inorganic materials 0.000 claims 1
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 description 14
- 238000000975 co-precipitation Methods 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000003917 TEM image Methods 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 229920002959 polymer blend Polymers 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000012018 catalyst precursor Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910003271 Ni-Fe Inorganic materials 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910021389 graphene Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- KBJMLQFLOWQJNF-UHFFFAOYSA-N nickel(ii) nitrate Chemical compound [Ni+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O KBJMLQFLOWQJNF-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 210000003296 saliva Anatomy 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000009385 viral infection Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/158—Carbon nanotubes
- C01B32/16—Preparation
- C01B32/162—Preparation characterised by catalysts
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Carbon And Carbon Compounds (AREA)
- Catalysts (AREA)
Abstract
The invention belongs to the technical field of carbon nanotube preparation, and particularly discloses a method for converting a waste mask into CNT (carbon nano tube) by a catalytic pyrolysis method. The method comprises the following steps: mixing the waste mask with a catalyst, and then isolating air to perform pyrolysis catalysis to obtain a carbon nano tube; or respectively placing the waste mask and the catalyst in two sections of heatable reaction containers which are communicated with each other, respectively heating, and then purging the gas generated by the waste mask section to the catalyst section through inert gas purging to carry out pyrolysis catalysis; obtaining CNT after the reaction is finished; the catalyst is a catalyst taking iron-nickel metal as an active catalytic component. According to the invention, the waste mask is mixed with the catalyst playing a role in catalytic growth of the carbon nano tube, and then the high-temperature pyrolysis catalytic reaction is carried out under the protection gas of inert gas, so that the waste mask is directly prepared into the carbon nano tube material, and the high added value reutilization of the waste mask is realized.
Description
Technical Field
The invention belongs to the technical field of carbon nanotube preparation, and particularly relates to a method for converting a waste mask into CNT (carbon nanotube) through a catalytic pyrolysis method.
Background
The disposable medical mask is used as a sanitary protective article, and can effectively prevent virus infection transmitted through saliva. Therefore, in the process of large-scale virus transmission, the demand and consumption of masks are continuously increased, a large number of treatment problems of waste masks are generated, and the traditional treatment modes of landfill and incineration waste resources and pollute the environment, so that how to change waste into valuable is important, and the high-added-value reutilization of the waste masks is promoted.
Patent publication CN112158823A discloses a method for preparing a porous carbon gel material by using a waste mask, which comprises the steps of firstly, heating the waste mask in an oven at a low temperature of 120 ℃ for 6-12 h. Secondly, drawing out a metal strip of the waste mask, and pre-carbonizing the biologically inactivated waste mask in an atmosphere protection furnace, wherein the pre-carbonizing step specifically comprises the following steps: using inert atmosphere protection, heating at 350-450 deg.C for 4-24 h. Fourthly, obtaining the porous carbon gel material through high-temperature carbonization and sintering, wherein the high-temperature carbonization process is as follows: using inert atmosphere protection, heating temperature is 700-1200 ℃, and heating time is 1-24 h. The method successfully prepares the waste mask into the porous carbon material, but the manufacturing period of the material is long, the preparation method is complicated, the additional value of the material is low, and the requirement of high additional value utilization is difficult to achieve.
Patent publication CN1830767A discloses a method for synthesizing carbon nanotubes by cracking polymer, which comprises blending 0.01-10 wt% of halogen in polymer blend, 0.05-40 wt% of metal element with carbon-forming catalysis effect in polymer blend; then burning the polymer blend in the air, collecting the residual carbon after the open fire is extinguished, namely the carbon nano tube product, or decomposing the blend in the air isolation at the temperature of 600-950 ℃, and collecting the residual carbon, namely the carbon nano tube product; collecting the released gas as hydrogen-rich gas. The method is simple and easy to operate and control, but the raw materials are limited to the traditional polymer raw materials, and the conversion rate of the CNT is low at present.
Meanwhile, in different application fields, different requirements are imposed on the form and structure of the carbon nano tube, wherein the bamboo-shaped CNT is separated by the bent graphene sheet to form a plurality of independent cavities. Compared with the common carbon nano tube, the bamboo-shaped structure has higher specific surface area and defect density and faster electron transfer rate, and has huge development prospect in the electrochemical field.
The disposable mask mainly comprises an inner layer, a middle layer and an outer layer, wherein the inner layer and the outer layer are polypropylene non-woven fabrics, the middle interlayer is polypropylene melt-blown fabrics, and the polypropylene non-woven fabrics are all made of polymer materials with high carbon content. The polymer can be directly thermally degraded into micromolecular hydrocarbons at high temperature, and the hydrocarbons can be used as a carbon source in the CNT preparation process, so that the conversion from the waste mask to the high-value CNT is realized.
Disclosure of Invention
In order to overcome the disadvantages and shortcomings of the prior art, the present invention provides a method for converting a waste mask into CNTs by catalytic pyrolysis.
The purpose of the invention is realized by the following scheme:
a method for converting a waste mask into CNTs by catalytic pyrolysis, comprising the steps of:
mixing the waste mask with a catalyst, and then isolating air to perform pyrolysis catalysis to obtain a carbon nano tube;
or respectively placing the waste mask and the catalyst in two sections of heatable reaction containers which are communicated with each other, respectively heating, and then purging the gas generated by the waste mask section to the catalyst section through inert gas purging to carry out pyrolysis catalysis; obtaining CNT after the reaction is finished;
the catalyst is a catalyst taking iron-nickel metal as an active catalytic component.
The types of the waste masks include, but are not limited to, disposable medical protective masks, common disposable masks, activated carbon masks, N95 masks and the like; the material of the waste mask comprises but is not limited to polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polylactic acid, polybutylene terephthalate and the like.
Preferably, the catalyst with iron-nickel metal as a main active component comprises nanoscale elemental iron, elemental nickel and an iron and nickel catalyst loaded on a catalyst carrier; the iron and nickel catalysts loaded on the catalyst carrier can be iron and nickel loaded on the same catalyst carrier, or iron and nickel can be loaded on different catalyst carriers.
More preferably, the iron and nickel catalyst supported on the catalyst carrier includes a mixture of at least one of elemental iron, an oxide of iron, an iron-nickel alloy, and an iron-nickel intermetallic compound, and at least one of elemental nickel and an oxide of nickel. Preferably, the iron-nickel alloy includes, but is not limited to, an FeNi alloy and the iron-nickel intermetallic compound includes, but is not limited to, FeNi3An intermetallic compound.
In the catalyst taking the iron-nickel metal as the active catalytic component, the molar ratio of nickel to iron is 1: 1-5: 1, preferably 2: 1-4: 1, and more preferably 3: 1.
The dosage of the catalyst accounts for 6-12 wt% of the waste mask, and preferably 10 wt%.
The waste mask and the catalyst are blended, and then the temperature for isolating air and carrying out pyrolysis catalysis is 600-1200 ℃, preferably 800-1100 ℃; the pyrolysis catalysis time is 1-4 h, preferably 2.5 h.
The respective heating is specifically as follows: the temperature of the heating section for placing the catalyst is raised to 600-550 ℃, and the heating temperature of the waste mask section is raised to 400-550 ℃; the pyrolysis catalysis time after the temperature rise is finished is 1-4 h, and preferably 2.5 h.
The heating rate of the heating section of the catalyst is 5-15 ℃/min, and the heating rate of the waste mask is 5-15 ℃/min.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the waste mask is mixed with the catalyst playing a role in catalytic growth of the carbon nano tube, and then the high-temperature pyrolysis catalytic reaction is carried out under the protection gas of inert gas, so that the waste mask is directly prepared into the carbon nano tube material, and the high added value reutilization of the waste mask is realized. The method provided by the invention can enable the yield to be more than 25% at most, and can also prepare the bamboo-shaped CNT when the molar ratio of nickel to iron is 3: 1.
Drawings
FIG. 1 is an XRD pattern of a product obtained by catalyzing with a waste mask under different catalysts
FIG. 2 is a scanning electron micrograph of the CNT obtained in the first example.
FIG. 3 is a transmission electron micrograph of the CNT obtained in the first example.
FIG. 4 is a transmission electron micrograph of CNTs obtained in example three.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
The reagents used in the examples are commercially available without specific reference.
The nickel-iron bimetallic catalyst in the examples was prepared by the following method:
dissolving ferric nitrate, nickel nitrate and aluminum nitrate (precursor of a catalyst carrier) in water, stirring at 40 ℃, gradually dropwise adding 1M ammonia water for coprecipitation, finally adjusting the pH to about 8-9, centrifugally washing and drying to obtain a catalyst precursor, and then placing the catalyst precursor in a tubular furnace to calcine for 3 hours at 800 ℃ to obtain the Ni-Fe bimetallic catalyst.
The first embodiment is as follows:
crushing the waste mask into about 1-4mm, blending with a 10 wt% nickel iron (Ni: Fe ═ 3:1) bimetallic catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction vessel, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis at 900 ℃ for 2 hours, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 25.470%. FIG. 2 is a scanning electron micrograph of the bamboo-like CNT obtained in the first example; FIG. 3 is a transmission electron microscope image of the bamboo-shaped CNT obtained in the first embodiment. It can be seen that the CNTs obtained in example one are bamboo-like.
Example two:
crushing the waste mask into about 1-4mm, blending with a 10 wt% nickel iron (Ni: Fe ═ 5:1) bimetallic catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction vessel, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis at 900 ℃ for 2 hours, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 16.15%. FIG. 4 is a transmission electron micrograph of the CNT obtained in example two. It can be seen that the CNTs obtained in example two are of the conventional type and are not bamboo-like.
Example three:
the method comprises the steps of crushing the waste mask into about 1-4mm, respectively placing the waste mask and a 10 wt% nickel iron (Ni: Fe ═ 3:1) bimetallic catalyst prepared by a coprecipitation method in two communicated sections of heatable reaction containers, wherein the heating temperature of the waste mask section is 500 ℃, the temperature of a heating section for placing the catalyst is 900 ℃, after heating, purging gas generated by the waste mask section to the catalyst section through inert gas, carrying out catalytic reaction for 2 hours, and collecting a residual carbon product of the catalyst section after the reaction is finished, namely a carbon nano tube product. The yield was 26.12%.
Example four:
crushing the waste mask into about 1-4mm, blending with a 10 wt% nickel iron (Ni: Fe ═ 3:1) bimetallic catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction vessel, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis at 1100 ℃ for 2 hours, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 25.03%.
Comparative example one:
crushing the waste mask into about 1-4mm, blending with a 10 wt% nickel iron (Ni: Fe ═ 1:1) bimetallic catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction vessel, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis at 900 ℃ for 2 hours, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 6.90%.
Comparative example two:
crushing the waste mask into about 1-4mm, blending with a 10 wt% nickel iron (Ni: Fe ═ 3:1) bimetallic catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction vessel, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis at 600 ℃ for 2 hours, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 3.11%.
Comparative example three:
crushing the waste mask into about 1-4mm, blending the crushed waste mask with a 10 wt% iron metal catalyst prepared by a coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction container, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis for 2 hours at 900 ℃, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 4.59%.
Comparative example four:
crushing the waste mask into about 1-4mm, blending the crushed waste mask with a nickel metal catalyst prepared by a 10 wt% coprecipitation method, uniformly mixing, placing the blend of the waste mask and the catalyst in a reaction container, isolating air under the action of protective gas or vacuum, carrying out pyrolysis catalysis for 2 hours at 900 ℃, and collecting residual carbon products after the reaction is finished, namely carbon nano tube products. The yield was 20.21%.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for converting waste masks into CNT by catalytic pyrolysis is characterized by comprising the following steps:
mixing the waste mask with a catalyst, and then isolating air to perform pyrolysis catalysis to obtain a carbon nano tube;
or respectively placing the waste mask and the catalyst in two sections of heatable reaction containers which are communicated with each other, respectively heating, and then purging the gas generated by the waste mask section to the catalyst section through inert gas purging to carry out pyrolysis catalysis; obtaining CNT after the reaction is finished;
the catalyst is a catalyst taking iron-nickel metal as an active catalytic component.
2. The method of claim 1, wherein: the catalyst with iron-nickel metal as a main active component comprises nanoscale elemental iron, elemental nickel and an iron and nickel catalyst loaded on a catalyst carrier; wherein the iron and nickel catalyst loaded on the catalyst carrier is obtained by loading iron and nickel on the same catalyst carrier and/or loading iron and nickel on different catalyst carriers.
3. The method of claim 2, wherein: the iron and nickel catalyst loaded on the catalyst carrier comprises a mixture of at least one of elementary iron, iron oxide, iron-nickel alloy and iron-nickel intermetallic compound and at least one of elementary nickel and nickel oxide.
4. The method of claim 1, wherein: in the catalyst taking iron and nickel as active catalytic components, the molar ratio of nickel to iron is 1: 1-5: 1.
5. The method of claim 1, wherein: in the catalyst taking iron and nickel as active catalytic components, the molar ratio of nickel to iron is 2: 1-4: 1.
6. The method of claim 1, wherein: in the catalyst taking iron and nickel as active catalytic components, the molar ratio of nickel to iron is 3: 1.
7. The method of claim 1, wherein: the dosage of the catalyst accounts for 6-12 wt% of the waste mask.
8. The method of claim 1, wherein: the waste mask is mixed with a catalyst, and then the temperature for isolating air to carry out pyrolysis catalysis is 600-1200 ℃; the pyrolysis catalysis time is 1-4 h; the respective heating is specifically as follows: the temperature of the heating section for placing the catalyst is raised to 600-550 ℃, and the heating temperature of the waste mask section is raised to 400-550 ℃; and the pyrolysis catalysis time after the temperature rise is finished is 1-4 h.
9. The method of claim 1, wherein: the heating rate of the heating section of the catalyst is 5-15 ℃/min, and the heating rate of the waste mask is 5-15 ℃/min.
10. The method of claim 1, wherein the waste masks are of the type comprising disposable medical protective masks, common disposable masks, activated carbon masks, N95 masks; the material of the waste mask comprises polypropylene, polyethylene, polystyrene, polyethylene terephthalate, polylactic acid and polybutylene terephthalate.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114855305A (en) * | 2022-04-25 | 2022-08-05 | 延边大学 | Preparation method of carbon nanofiber material |
| CN115445630A (en) * | 2022-08-30 | 2022-12-09 | 广东工业大学 | Polypropylene-based tin-doped carbon-coated nickel catalyst and preparation method and application thereof |
| CN115874004A (en) * | 2022-12-22 | 2023-03-31 | 昆明理工大学 | Method for directly reducing iron ore concentrate through microwave-assisted gasification of waste disposable medical mask |
| CN118352547A (en) * | 2024-05-08 | 2024-07-16 | 华中农业大学 | Waste plastic source nitriding carbon-based electrode material and preparation method thereof |
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| CN113620277A (en) * | 2021-06-10 | 2021-11-09 | 北京化工大学 | Method for preparing carbon nano tube and hydrogen by high-valued utilization of waste medical masks |
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| CN115445630B (en) * | 2022-08-30 | 2023-11-17 | 广东工业大学 | Polypropylene-based tin-doped carbon-coated nickel catalyst and preparation method and application thereof |
| CN115874004A (en) * | 2022-12-22 | 2023-03-31 | 昆明理工大学 | Method for directly reducing iron ore concentrate through microwave-assisted gasification of waste disposable medical mask |
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