CN111111662A - Foam metal catalyst of supported goethite and preparation method thereof - Google Patents
Foam metal catalyst of supported goethite and preparation method thereof Download PDFInfo
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- CN111111662A CN111111662A CN202010005699.6A CN202010005699A CN111111662A CN 111111662 A CN111111662 A CN 111111662A CN 202010005699 A CN202010005699 A CN 202010005699A CN 111111662 A CN111111662 A CN 111111662A
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- 239000006260 foam Substances 0.000 title claims abstract description 115
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 92
- 239000002184 metal Substances 0.000 title claims abstract description 92
- 239000003054 catalyst Substances 0.000 title claims abstract description 81
- 229910052598 goethite Inorganic materials 0.000 title claims abstract description 81
- AEIXRCIKZIZYPM-UHFFFAOYSA-M hydroxy(oxo)iron Chemical compound [O][Fe]O AEIXRCIKZIZYPM-UHFFFAOYSA-M 0.000 title claims abstract description 81
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000012855 volatile organic compound Substances 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000004480 active ingredient Substances 0.000 claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 18
- 229910052759 nickel Inorganic materials 0.000 claims description 17
- 238000002791 soaking Methods 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000006262 metallic foam Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910000881 Cu alloy Inorganic materials 0.000 claims description 3
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 3
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 3
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 claims description 3
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 230000003197 catalytic effect Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 229910000510 noble metal Inorganic materials 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 230000015556 catabolic process Effects 0.000 abstract description 3
- 239000007857 degradation product Substances 0.000 abstract description 3
- 238000006731 degradation reaction Methods 0.000 abstract description 3
- 238000013012 foaming technology Methods 0.000 abstract description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 2
- 229910002090 carbon oxide Inorganic materials 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 12
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- 238000006555 catalytic reaction Methods 0.000 description 3
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- 238000010168 coupling process Methods 0.000 description 3
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- 230000006378 damage Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- URLKBWYHVLBVBO-UHFFFAOYSA-N Para-Xylene Chemical group CC1=CC=C(C)C=C1 URLKBWYHVLBVBO-UHFFFAOYSA-N 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000012876 carrier material Substances 0.000 description 2
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- 230000007547 defect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
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- 206010068319 Oropharyngeal pain Diseases 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 201000007100 Pharyngitis Diseases 0.000 description 1
- 206010074268 Reproductive toxicity Diseases 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000000172 allergic effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 208000010668 atopic eczema Diseases 0.000 description 1
- 210000004556 brain Anatomy 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
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- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 210000003734 kidney Anatomy 0.000 description 1
- 210000004185 liver Anatomy 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 229910002027 silica gel Inorganic materials 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
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- B01J35/56—
-
- 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
-
- 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
-
- 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
- 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
- B01J23/74—Iron group metals
- B01J23/745—Iron
-
- 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
- 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
- B01J23/74—Iron group metals
- B01J23/755—Nickel
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/34—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation
- B01J37/349—Irradiation by, or application of, electric, magnetic or wave energy, e.g. ultrasonic waves ; Ionic sputtering; Flame or plasma spraying; Particle radiation making use of flames, plasmas or lasers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention belongs to the technical field of industrial waste gas treatment, and particularly provides a supported goethite foam metal catalyst and a preparation method thereof, wherein the supported goethite foam metal catalyst comprises a carrier and an active ingredient, the active ingredient is attached to the carrier, the carrier is foam metal, and the active ingredient is goethite, so that the problems that the traditional noble metal catalyst has good thermal stability and other unique physicochemical properties, the degradation rate of plasma to VOCs is improved, the selectivity of carbon oxides in degradation products is improved, but the noble metal is expensive are solved, the catalyst has the advantages that based on the mesh three-dimensional structure, the larger porosity and the certain mechanical strength of the foam technology, the high specific surface area, the large aperture and the surface chemical activity of the goethite are combined, the catalytic performance of the catalyst can be obviously improved, the VOCs can be efficiently removed, and the foam metal can adsorb the VOCs and is more favorable for removing the VOCs, effectively improves the removal efficiency of VOCs and reduces secondary pollution, and has the advantages of low cost and environmental friendliness.
Description
Technical Field
The invention belongs to the technical field of industrial waste gas treatment, and particularly relates to a supported goethite foam metal catalyst and a preparation method thereof.
Background
With the development of human society and the acceleration of industrialization, the pollution of Volatile Organic Compounds (VOCs) is increasingly prominent, so that a lot of VOCs pollutants are generated in the industries of medicine, chemical engineering, buildings and the like, and the pollution of the VOCs has great influence on the healthy life of people. The environmental hazard caused by the massive discharge of VOCs is mainly represented by: under the conditions of heat and illumination, VOCs can interact with each other to form ozone, so that the air quality is deteriorated; VOCs are more main components of dust haze and photochemical smog and are also important precursor substances for forming PM2.5, in PM2.5, the proportion of VOCs is about 20-40%, and part of PM2.5 is converted by VOCs; many VOCs gases can generate greenhouse effect, which causes the more obvious greenhouse effect at present and causes global temperature rise; moreover, most VOCs are irritant and toxic, and when reaching a certain concentration, the VOCs can irritate eyes and respiratory tracts of human bodies, so that skin is allergic and sore throat; moreover, VOCs can damage the nerve center of human body and damage kidney, liver, brain and the like through blood-brain obstruction; in addition, VOCs also have carcinogenic, reproductive toxicity, and teratogenic effects.
At present, the treatment methods of VOCs according to the principle mainly include two types of VOCs recovery technology and destruction technology for decomposing VOCs molecules. Compared with the conventional treatment methods such as a condensation technology, a membrane separation technology, a catalytic combustion technology and the like, the low-temperature plasma technology has the advantages of convenience in use, low energy consumption, high efficiency and less generated secondary pollution. However, when VOCs in the atmosphere are treated by using low-temperature plasma alone, not only by-products are generated, but also energy efficiency and mineralization rate are low. In order to solve the problem of low removal efficiency of low-temperature plasma, low-temperature plasma is generally used in combination with a catalyst to improve the removal efficiency.
Currently, catalysts commonly used for coupling with low temperature plasma include adsorption materials, noble metal materials, metal oxide catalysts, and the like. The common adsorption materials comprise molecular sieve catalysts, Al2O3, silica gel, activated carbon and the like, and have the characteristics of high thermal stability, large porosity, good activity and selectivity and the like. A large number of researches show that the adsorbing material catalyst can prolong the retention time of VOCs in a plasma region, effectively improve the removal efficiency of the VOCs, and greatly induce the generation of secondary byproducts. The traditional noble metal catalyst has good thermal stability and other unique physicochemical properties. The noble metal catalyst is used by the mechanism that the active points of the noble metal catalyst must be activated at relatively high temperature, but a large amount of active particles and high-energy electrons existing in a plasma discharge counter zone replace the action of high temperature to activate the traditional noble metal catalyst. Precious metals such as Au, Ag and Pt are also frequently used for plasma catalytic reaction, foreign researchers research that catalysts using Au, Pt and the like as active components improve the degradation rate of VOCs by plasma and simultaneously improve the selectivity of oxycarbide in degradation products, but due to the high price of the precious metals, more and more researchers turn the eyes to other catalyst materials with relatively low price, and expect to develop catalysts more suitable for removing VOCs gas by plasma so as to improve the efficiency of removing VOCs gas by plasma.
Disclosure of Invention
The invention provides a supported goethite foam metal catalyst and a preparation method thereof, aiming at overcoming the problems that the traditional noble metal catalyst in the prior art has good thermal stability and other unique physicochemical properties, improves the degradation rate of plasma on VOCs and the selectivity of carbon oxides in degradation products, but the noble metal is expensive; the second purpose is to overcome the problem that other catalyst materials with relatively low price are urgently needed in the prior art, and the catalyst is more suitable for removing the VOCs gas by the plasma so as to improve the efficiency of removing the VOCs gas by the plasma.
The invention provides a supported goethite foam metal catalyst, which comprises a carrier and an active ingredient, wherein the active ingredient is attached to the carrier, the carrier is foam metal, and the active ingredient is goethite.
The porosity of the metal foam is between 30ppi and 90 ppi.
The foam metal is one or more of foam nickel, foam copper, foam iron and foam alloy, and the foam alloy is foam nickel copper alloy, foam nickel iron alloy and foam copper iron alloy.
A preparation method of a supported goethite foam metal catalyst comprises the following steps:
1) uniformly soaking the foam metal in the goethite solution;
2) and drying the impregnated foam metal.
The step 1) is operated by adopting an isometric immersion method.
The mass concentration of the goethite solution in the step 1) is 2-5 wt%.
The drying temperature in the step 2) is 100-120 ℃, and the drying time is 2-4 h.
The supported goethite foam metal catalyst is applied to the removal of VOCs gas by low-temperature plasma.
And (3) roasting the supported goethite foam metal catalyst in low-temperature plasma.
The roasting power is 60-100W, and the roasting step time is 5-15 min.
The invention has the beneficial effects that: the supported goethite foam metal catalyst provided by the invention takes porous foam metal as a carrier and goethite as a supported active component, and has good hydromechanical properties, smaller unit pressure loss and higher ductility, high thermal conductivity and machining characteristics compared with common crystalline and granular carrier materials due to a large amount of pore structures in the foam metal, so that the catalyst is more suitable for gas-phase and liquid-phase catalytic systems, and the net-shaped three-dimensional structure, larger porosity and certain mechanical strength of the foam metal can provide high-density active sites for the catalyst carrier, and the foam metal has good adsorption performance, effectively prolongs the retention time of the foam metal in a low-temperature plasma system, and promotes the collision and reaction probability of VOCs molecules and plasma active substances (high-energy electrons, active free radicals, ions and the like), the catalyst has very remarkable advantages when being applied to the catalytic reaction of VOCs; the goethite active components widely existing in nature can keep the morphology of goethite and generate a large number of nano-pore structures after roasting and dehydration, and can be sintered into different iron-containing oxides, the iron-containing oxides with different valence states effectively increase the activity of the catalyst, the strong adsorption performance and the catalytic performance of the goethite are combined to better promote the catalytic effect, the goethite is cheap and easy to obtain, is nontoxic and harmless to the environment, and effectively improves the application value of low-value mineral materials. The supported goethite foam metal catalyst provided by the invention is based on a net-shaped three-dimensional structure, larger porosity and certain mechanical strength of a foam technology, combines high specific surface area, large aperture and surface chemical activity of goethite, can obviously improve the catalytic performance of the catalyst, can efficiently remove VOCs, is more beneficial to removing VOCs because the foam metal can adsorb the VOCs, effectively improves the removal efficiency of the VOCs, reduces secondary pollution, and has the advantages of low cost and environmental friendliness. The supported goethite foam metal catalyst can be directly used as a catalyst for removing VOCs, or used as a catalyst carrier for further loading active ingredients, and the comprehensive performance of the supported goethite foam metal catalyst is superior to that of other catalyst carriers;
according to the preparation method of the supported goethite foam metal catalyst, the goethite is loaded on the foam metal by adopting an isometric impregnation method, and is loaded on the foam metal due to the fact that the goethite is a loose, easily hydrolyzed and amorphous powdery substance, so that the goethite is favorably fixed;
according to the method for removing VOCs by coupling the foam metal catalyst of the supported goethite with the low-temperature plasma, the low-temperature plasma is assisted by the foam metal catalyst of the supported goethite to remove VOCs gas, so that the removal efficiency of VOCs is high, the defects of a large number of byproducts, poor CO2 selectivity, low energy efficiency and mineralization rate and the like caused by the fact that the low-temperature plasma is used alone are effectively overcome, and the method has a good industrial application prospect.
Detailed Description
Example 1:
a supported goethite foam metal catalyst comprises a carrier and an active ingredient, wherein the active ingredient is attached to the carrier, the carrier is foam metal, and the active ingredient is goethite.
The supported goethite foam metal catalyst provided by the invention takes porous foam metal as a carrier and goethite as a supported active component, and has good hydromechanical properties, smaller unit pressure loss and higher ductility, high thermal conductivity and machining characteristics compared with common crystalline and granular carrier materials due to a large amount of pore structures in the foam metal, so that the catalyst is more suitable for gas-phase and liquid-phase catalytic systems, and the net-shaped three-dimensional structure, larger porosity and certain mechanical strength of the foam metal can provide high-density active sites for the catalyst carrier, and the foam metal has good adsorption performance, effectively prolongs the retention time of the foam metal in a low-temperature plasma system, and promotes the collision and reaction probability of VOCs molecules and plasma active substances (high-energy electrons, active free radicals, ions and the like), the catalyst has very remarkable advantages when being applied to the catalytic reaction of VOCs; the goethite active components widely existing in nature can keep the morphology of goethite and generate a large number of nano-pore structures after roasting and dehydration, and can be sintered into different iron-containing oxides, the iron-containing oxides with different valence states effectively increase the activity of the catalyst, the strong adsorption performance and the catalytic performance of the goethite are combined to better promote the catalytic effect, the goethite is cheap and easy to obtain, is nontoxic and harmless to the environment, and effectively improves the application value of low-value mineral materials. The supported goethite foam metal catalyst can be directly used as a catalyst for removing VOCs, or used as a catalyst carrier for further loading active ingredients, and the comprehensive performance of the supported goethite foam metal catalyst is superior to that of other catalyst carriers.
The porosity of the metal foam is between 30ppi and 90 ppi.
The foam metal is one or more of foam nickel, foam copper, foam iron and foam alloy, and the foam alloy is foam nickel copper alloy, foam nickel iron alloy and foam copper iron alloy.
The supported goethite foam metal catalyst is based on a net-shaped three-dimensional structure, larger porosity and certain mechanical strength of a foam technology, combines high specific surface area, large aperture and surface chemical activity of goethite, can obviously improve the catalytic performance of the catalyst, can remove VOCs efficiently, has better adsorption force when the porosity of the foam metal is 30-90 ppi because the foam metal nickel, copper, iron and foam alloy can also adsorb the VOCs, is more beneficial to removing the VOCs, effectively improves the removal efficiency of the VOCs, reduces secondary pollution, and has the advantages of low cost and environmental friendliness.
The following examples are based on example 1.
Example 2:
a preparation method of a supported goethite foam metal catalyst comprises the following steps:
1) uniformly soaking the foam metal in the goethite solution;
2) and drying the impregnated foam metal.
The step 1) is operated by adopting an isometric immersion method.
The mass concentration of the goethite solution in the step 1) is 2-5 wt%.
The drying temperature in the step 2) is 100-120 ℃, and the drying time is 2-4 h.
According to the preparation method of the supported goethite foam metal catalyst, the goethite is loaded on the foam metal by adopting an isometric impregnation method, and the goethite is a loose, easily hydrolyzed and amorphous powdery substance and is loaded on the foam metal, so that the fixation of the goethite is facilitated.
Example 3:
the supported goethite foam metal catalyst is applied to the removal of VOCs gas by low-temperature plasma.
And (3) roasting the supported goethite foam metal catalyst in low-temperature plasma.
The roasting power is 60-100W, and the roasting step time is 5-15 min.
According to the method for removing VOCs by coupling the foam metal catalyst of the supported goethite with the low-temperature plasma, the low-temperature plasma is assisted by the foam metal catalyst of the supported goethite to remove VOCs gas, so that the removal efficiency of VOCs is high, the defects of a large number of byproducts, poor CO2 selectivity, low energy efficiency and mineralization rate and the like caused by the fact that the low-temperature plasma is used alone are effectively overcome, and the method has a good industrial application prospect.
Example 4:
the preparation method of the supported goethite foam metal catalyst comprises the following steps:
(1) preparing 2g of foamed metal nickel with the specification of 10mm multiplied by 5mm and the porosity of 70ppi for later use;
(2) soaking the foam metal nickel in goethite solution with the mass concentration of 3 wt% by an isometric soaking method, putting the obtained soaked foam metal into an air-blowing drying oven, and drying at 100 ℃ for 2-4h to obtain the nickel-based foam metal.
And (3) placing the obtained supported goethite foam metal catalyst in low-temperature plasma with the power of 80W for roasting for 10min, and then introducing dimethylbenzene gas for removing.
Example 5:
the preparation method of the supported goethite foam metal catalyst comprises the following steps:
(1) preparing 1g of foamed metal nickel with the specification of 10mm multiplied by 5mm and the porosity of 90ppi for later use;
(2) soaking the foam metal nickel in goethite solution with the mass concentration of 5 wt% by an isometric soaking method, putting the obtained soaked foam metal into an air-blowing drying oven, and drying at 100 ℃ for 2-4h to obtain the nickel-based foam metal.
And (3) placing the obtained supported goethite foam metal catalyst in low-temperature plasma with the power of 60W for roasting for 15min, and then introducing dimethylbenzene gas for removing.
Example 6:
the preparation method of the supported goethite foam metal catalyst comprises the following steps:
(1) preparing 3g of foam metal nickel with the specification of 10mm multiplied by 5mm and the porosity of 30ppi for later use;
(2) soaking the foam metal nickel in goethite solution with the mass concentration of 2 wt% by an isometric soaking method, putting the obtained soaked foam metal into an air-blowing drying oven, and drying at 100 ℃ for 2-4h to obtain the nickel-based foam metal.
And (3) placing the obtained supported goethite foam metal catalyst in low-temperature plasma with the power of 100W for roasting for 5min, and then introducing dimethylbenzene gas for removing.
Example 7:
the preparation method of the supported goethite foam metal catalyst comprises the following steps:
(1) preparing 2g of foam metal copper with the specification of 10mm multiplied by 5mm and the porosity of 70ppi for later use;
(2) soaking the foam metal nickel in goethite solution with the mass concentration of 3 wt% by an isometric soaking method, putting the obtained soaked foam metal into an air-blowing drying oven, and drying at 100 ℃ for 2-4h to obtain the nickel-based foam metal.
And (3) placing the obtained supported goethite foam metal catalyst in low-temperature plasma with the power of 80W for roasting for 10min, and then introducing dimethylbenzene gas for removing.
Example 8:
the preparation method of the supported goethite foam metal catalyst comprises the following steps:
(1) preparing 2g of foam metal iron with the specification of 10mm multiplied by 5mm and the porosity of 70ppi for later use;
(2) soaking the foam metal nickel in goethite solution with the mass concentration of 3 wt% by an isometric soaking method, putting the obtained soaked foam metal into an air-blowing drying oven, and drying at 100 ℃ for 2-4h to obtain the nickel-based foam metal.
And (3) placing the obtained supported goethite foam metal catalyst in low-temperature plasma with the power of 80W for roasting for 10min, and then introducing dimethylbenzene gas for removing.
The detection result of removing dimethylbenzene is as follows:
the detection results in the table show that the removal rate of the paraxylene can reach 100%, the average removal rate can reach more than 99.7%, and the removal effect of the VOCs is good.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (10)
1. A supported goethite foam metal catalyst is characterized in that: the active ingredient is attached to the carrier, the carrier is foam metal, and the active ingredient is goethite.
2. The supported goethite metal foam catalyst of claim 1, wherein: the porosity of the metal foam is between 30ppi and 90 ppi.
3. The supported goethite metal foam catalyst of claim 1, wherein: the foam metal is one or more of foam nickel, foam copper, foam iron and foam alloy, and the foam alloy is foam nickel copper alloy, foam nickel iron alloy and foam copper iron alloy.
4. A process for the preparation of a supported goethite metal foam catalyst according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
1) uniformly soaking the foam metal in the goethite solution;
2) and drying the impregnated foam metal.
5. The process for preparing a supported goethite metal foam catalyst according to claim 4, wherein: the step 1) is operated by adopting an isometric immersion method.
6. The process for preparing a supported goethite metal foam catalyst according to claim 4, wherein: the mass concentration of the goethite solution in the step 1) is 2-5 wt%.
7. The process for preparing a supported goethite metal foam catalyst according to claim 4, wherein: the drying temperature in the step 2) is 100-120 ℃, and the drying time is 2-4 h.
8. Use of the supported goethite foam metal catalyst according to any one of claims 1 to 3 for low temperature plasma removal of VOCs gases.
9. The use of claim 8, wherein: and (3) roasting the supported goethite foam metal catalyst in low-temperature plasma.
10. The use of claim 8, wherein: the roasting power is 60-100W, and the roasting step time is 5-15 min.
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