CN116328726A - High-performance CO trapping device 2 Biochar of (2) and preparation method and application thereof - Google Patents
High-performance CO trapping device 2 Biochar of (2) and preparation method and application thereof Download PDFInfo
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- 238000003763 carbonization Methods 0.000 claims abstract description 34
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 12
- 238000006555 catalytic reaction Methods 0.000 claims abstract description 10
- 239000002028 Biomass Substances 0.000 claims description 24
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 21
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- 238000010000 carbonizing Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 14
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 claims description 12
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
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- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical compound [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 description 2
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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
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- 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
- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
- B01J20/28064—Surface area, e.g. B.E.T specific surface area being in the range 500-1000 m2/g
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28069—Pore volume, e.g. total pore volume, mesopore volume, micropore volume
- B01J20/28071—Pore volume, e.g. total pore volume, mesopore volume, micropore volume being less than 0.5 ml/g
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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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28078—Pore diameter
- B01J20/2808—Pore diameter being less than 2 nm, i.e. micropores or nanopores
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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Abstract
The invention discloses a high-performance CO trapping device 2 The biochar and the preparation method and the application thereof belong to the technical field of carbon trapping and carbon sealing. The invention adopts a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, plays the role of potassium salt catalytic hydrolysis and catalytic pore-forming, and forms a large number of small-aperture micropores. Under the condition of no increase of cost, the emerging two-step activation and carbonization process is optimized to realize CO 2 The trapping capacity is obviously improved, and the trapping amount reaches 142mg/g at normal temperature and normal pressure (25 ℃ and 1 bar). The invention relates to a method for strengthening CO 2 The trapping technology provides a preparation process of the porous biochar with micropores as the main factor, is simple, convenient and fast, has good effect and can be popularized and applied.
Description
Technical Field
The application belongs to the technical field of greenhouse gas treatment and materials, and more particularly relates to a high-performance CO trapping device 2 Is prepared from biochar, and its preparation method and application.
Background
Global climate change, especially elevated temperatures, has had a tremendous adverse impact on human life, such as severe drought, extreme stormy weather, glacier melting, and sea level elevation, threatening the continuation of life of the earth. The emission of a large amount of greenhouse gases is a leading cause of global temperature rise, and the control of the emission is a key and precondition for slowing down the temperature rise. CO 2 Is an important research object in greenhouse gases, and has huge release amount in the production processes of agriculture, industry and the like. CO 2 Is one of the carbon sealing technologies emerging in recent years, and has the advantages of simple and convenient operation, lower cost, higher efficiency and the like.
In recent years, studies have shown that biochar can be used for CO 2 Is effectively trapped. The biochar is a black carbon product of anaerobic thermal cracking of agriculture, forestry and animal husbandry biomass waste, and has the advantages of reducing solid biomass waste and excellent surface/pore structure performance, so that the biochar becomes a research hot spot and a focus in the agriculture, forestry and environmental field.Cao and the like prepare various biochar by using rape straw, soybean straw, corn straw, wheat straw, walnut shell, hickory nut wood and pine wood, and all have good CO 2 The trapping capacity can reach 46mg/g (Cao et al, 2022,Separation and Purification Technology,Straw and wood based biochar for CO) 2 capture: adsorption performance and governing mechanisms). Liu et al used sludge to prepare biochar, CO thereof 2 The trapping capacity of the sludge biochar can reach 28mg/g, and the CO is obtained after the preparation process of the sludge biochar is optimized 2 The trapping capacity of the catalyst can reach 49mg/g (Liu et al, 2022,Journal of Environmental Chemical Engineering,CO) 2 capture performance of biochar prepared from sewage sludge after conditioning with different dewatering agents)。
The biochar has higher moldability, the properties such as pore structure and the like can be improved and promoted by optimizing the preparation process, and CO trapping is enhanced 2 Is provided). However, for CO 2 The biochar with improved trapping efficiency and the preparation process are relatively lacking, and development and application are urgently needed.
Disclosure of Invention
1. Object of the invention
The purpose of the application is to provide a high-performance CO capturing device 2 The biomass charcoal has abundant micropores, especially the micropores with the pore diameter smaller than 0.8nm and 0.5nm are more in number, the specific surface area and pore volume ratio of the micropores are both larger than those of the conventional biomass charcoal, and the CO of the biomass charcoal is 2 The trapping capacity of the device is greatly improved.
It is another object of the present application to provide a high performance CO capture 2 The preparation method of the biochar adopts a potassium salt assisted double catalysis and double carbonization process to prepare the biochar for capturing CO meeting the requirements 2 The biochar of (2) improves the capture of CO by the biochar 2 Capability.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the application is as follows:
the application provides a high performance CO capture 2 Is the micropores of the biomass charcoalThe proportion of the pore volume to the total pore volume can reach 76 percent, and the proportion of the micropore specific surface area to the total specific surface area can reach 79 percent.
Further, the high-performance CO capturing device 2 Wherein the proportion of the micropore volume of the biochar with the pore diameter smaller than 0.8nm to the total micropore volume can reach 67 percent.
Further, the high-performance CO capturing device 2 Wherein the proportion of the micropore volume of the biochar with the pore diameter smaller than 0.5nm to the total micropore volume can reach 19 percent.
The application also provides a method for capturing CO with high performance 2 The method adopts a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and in the low-temperature hydrothermal catalysis carbonization process, potassium salt can separate lignin, cellulose, hemicellulose and the like of agriculture and forestry biomass, and etch pores to accelerate hydrolysis and recondensing of biomass; meanwhile, salt ions are uniformly distributed on the surface and in gaps of cellulose, so that the formation and wide distribution of micropores in the high-temperature anaerobic thermal cracking process are facilitated, and the method specifically comprises the following steps:
s1: assist in hydrothermal carbonization: cleaning agricultural and forestry biomass waste, crushing to 80-100 meshes by a crusher, mixing with potassium salt, adding deionized water, placing in a hydrothermal reaction kettle, carbonizing at low temperature, cooling, taking out, and drying to obtain a carbon-based product;
s2: potassium salt assists in anaerobic thermal cracking: placing the carbon-based product in the S1 into a corundum crucible, placing the corundum crucible into a tubular muffle furnace, heating at a low speed, carbonizing at a high temperature, protecting with nitrogen in the whole process, cooling to room temperature at a low speed, taking out, grinding, pickling, washing with water, and drying to obtain the high-performance CO trapping product 2 Is a biochar of (a).
Further, the potassium salt includes one or more of potassium formate and potassium acetate.
Further, the agriculture and forestry biomass waste comprises one or more of bamboo, wood dust and straw.
Further, in the above S1, the mass ratio of the potassium salt to the agricultural and forestry biomass waste is (0.5 to 2): 1.
Further, in the step S1, the addition ratio of the agricultural and forestry biomass waste to the deionized water is 300-500 g/L.
Further, in the step S1, the low-temperature carbonization temperature is 180-200 ℃ and the carbonization time is 2-4 h.
Further, in the above S2, the temperature rise rate of the low-speed temperature rise is 1 to 2 ℃/min.
Further, in the step S2, the high-temperature carbonization temperature is 700-900 ℃ and the carbonization time is 1-4 h.
Further, in the above step S2, the cooling rate of the low-speed cooling is 2-5 ℃/min.
Further, in the above S2, the flow rate of nitrogen gas is 50 to 200mL/min.
The application also provides a high-performance CO trapping device prepared by the preparation method 2 Is a biochar of (a).
The application also provides the high-performance CO capturing device 2 The application of the biochar and/or the preparation method thereof in carbon emission reduction.
Further, the above application in carbon abatement includes capturing CO with a high performance 2 Is used for capturing CO 2 。
3. Advantageous effects
Compared with the prior art, the application has the beneficial effects that:
(1) The application provides a high-performance CO trapping device 2 Compared with the prior art, the biological carbon and the preparation method and application thereof adopt a formate double-catalysis and double-carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and in the process of potassium salt assisted hydrothermal carbonization, the potassium salt can separate biomass lignin, cellulose and hemicellulose, etch pores and accelerate hydrolysis and recondensing of biomass. Meanwhile, potassium ions are uniformly distributed on the surface and in gaps of cellulose, so that the formation and wide distribution of micropores in the high-temperature anaerobic thermal cracking process are facilitated.
(2) The application provides a high-performance CO trapping device 2 Compared with the prior art, the biochar has rich micropores (micropore specific surface)The product reaches 923m 2 Per gram, micropore volume of 0.48cm 3 Per g), in particular the number of small micropores (pore volume of less than 0.2nm up to 0.09cm 3 Per g, pore volume of less than 0.8nm reaching 0.32cm 3 /g) biomass char. In addition, the total pores have a very large pore ratio, for example, up to 79% of the total specific surface area and up to 76% of the total pore volume.
(3) The invention provides a high-performance CO trapping device 2 The biochar and the preparation method and application thereof have the advantages of simple method, low cost, no corrosiveness of the used organic potassium salt, green carbonization process and capability of being used for large-scale popularization.
Drawings
FIG. 1 is a graph showing the adsorption and desorption curves of nitrogen for the biochar of example 1 and the biochar of comparative example.
FIG. 2 is the biochar pair CO of example 1 and the biochar pair CO of comparative example 2 Adsorption isotherms (25 ℃ C.).
Detailed Description
The invention is further described below in connection with specific embodiments.
The terms such as "upper", "lower", "left", "right", "middle" and the like referred to in the present specification are also for convenience of description, and are not intended to limit the scope of the present invention, but rather to limit the scope of the present invention, and the changes or modifications of the relative relationship are considered to be within the scope of the present invention without substantial modification of the technical content.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
As used herein, the term "about" is used to provide the flexibility and inaccuracy associated with a given term, metric or value. The degree of flexibility of a particular variable can be readily determined by one skilled in the art.
As used herein, the term "is intended to be synonymous with" one or more of ". For example, "at least one of A, B and C" expressly includes a only, B only, C only, and respective combinations thereof.
Concentrations, amounts, and other numerical data may be presented herein in a range format. It is to be understood that such range format is used merely for convenience and brevity and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of about 1 to about 4.5 should be interpreted to include not only the explicitly recited limits of 1 to about 4.5, but also include individual numbers (such as 2, 3, 4) and subranges (such as 1 to 3, 2 to 4, etc.). The same principles apply to ranges reciting only one numerical value, such as "less than about 4.5," which should be construed to include all such values and ranges. Moreover, such an interpretation should apply regardless of the breadth of the range or the characteristics being described.
Example 1
The embodiment provides a high performance CO capture 2 The preparation method of the biochar and the biochar prepared by the preparation method adopt a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and specifically comprise the following steps:
(1) Cleaning agricultural and forestry biomass waste (bamboo waste), crushing into 100 meshes by a crusher, mixing with potassium formate (16 g of potassium formate, 16g of bamboo powder), adding deionized water (solid-to-liquid ratio: 320 g/L), placing in a hydrothermal reaction kettle, carbonizing at 200 ℃ for 2h, cooling, taking out, and drying to obtain the carbon-based material.
(2) Placing the carbon-based material in the step (1) into a corundum crucible, placing into a tubular muffle furnace, heating at 2 ℃/min, carbonizing at 900 ℃ for 2h, protecting with nitrogen (200 mL/min), cooling at 5 ℃/min, taking out after room temperature, grinding, pickling, washing with water, and drying to obtain the high-temperature carbon-based materialPerformance CO capture 2 Is a biochar of (a).
Comparative example 1
The present example provides a method for preparing biochar and biochar prepared by the same (the emerging carbonization technology is used as a comparison: hydrothermal carbonization and catalytic pyrolysis), and a formate double catalytic process (the same raw materials as those in example 1 but different processes) is not adopted, and specifically comprises the following steps:
(1) Cleaning agricultural and forestry biomass waste (bamboo waste), crushing to 100 meshes by a crusher, placing bamboo powder (16 g) in a hydrothermal reaction kettle, adding deionized water (solid-liquid ratio: 320 g/L), carbonizing at 200 ℃ for 2 hours, cooling, taking out, and drying to obtain a carbon-based material.
(2) Placing the carbon-based material in the step (1) into a corundum crucible, adding 16g of potassium formate, placing into a tubular muffle furnace, heating at 2 ℃/min, carbonizing at 900 ℃ for 2 hours, protecting with nitrogen (200 mL/min), cooling at 5 ℃/min, taking out after room temperature, grinding, pickling, washing with water, and drying to obtain the biochar.
Analysis of results:
high Performance CO Capture in example 1 2 The pore structure parameters of the biochar of (a) and the biochar of comparative example 1 are shown in Table 1, the nitrogen adsorption and desorption curves are shown in FIG. 1, and the carbon monoxide is purified by the method 2 The adsorption isotherms (25 ℃) of (C) are shown in FIG. 2.
Table 1 pore structure parameters of biochar in example 1 and biochar in comparative example
As can be seen from fig. 1 and table 1, the carbonization process of the present application focuses not on the increase of the specific surface area but on the increase of the micropore specific surface area and micropore volume. In addition, example 1 high performance CO capture 2 The specific surface area ratio and pore volume ratio of the micropores reach 79% and 76%, respectively, which are far higher than those of the biochar in comparative example 1. CO 2 The key to trapping is the small pore size micropores (CO 2 About 0.33 nm), in particular 0.5nm, which are more effective, are trapping sitesCO collection 2 Is an important parameter of (a). It can be seen that the high performance capture of CO in example 1 2 Micro-pores of%<0.5 nm) pore volume higher than that of the micropores of the biochar in comparative example 1<0.5 nm) pore volume is more than 4 times. As can be seen from FIG. 2, the high performance CO capture of example 1 2 CO of biochar of (a) 2 The trapping amount is significantly higher than that of the biochar of comparative example 1, and the high performance of example 1 traps CO at normal temperature and normal pressure (25 ℃ C., 1 bar) 2 CO of biochar of (a) 2 The trapping amount reaches 142mg/g, the comparative example 1 is 116mg/g, the trapping amount is increased by 22% (the raw materials and the cost are unchanged, only the process is changed, and CO is changed) 2 The trapping capacity is significantly improved).
Example 2
The embodiment provides a high performance CO capture 2 The preparation method of the biochar and the biochar prepared by the preparation method adopt a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and specifically comprise the following steps:
(1) Cleaning agricultural and forestry biomass waste (wood chip waste), crushing into 80 meshes by a crusher, mixing with potassium formate (8 g of potassium formate, 16g of bamboo powder), adding deionized water (solid-to-liquid ratio: 400 g/L), placing in a hydrothermal reaction kettle, carbonizing at 180 ℃ for 3 hours, cooling, taking out, and drying to obtain the carbon-based material.
(2) Placing the carbon-based material in the step (1) into a corundum crucible, placing the corundum crucible into a tubular muffle furnace, heating at 1 ℃/min, carbonizing at 700 ℃ for 4 hours, protecting with nitrogen (50 mL/min), cooling at 2 ℃/min, taking out after the temperature is reduced, grinding, pickling, washing with water, and drying to obtain the high-performance CO trapping material 2 Is a biochar of (a).
Example 3
The embodiment provides a high performance CO capture 2 The preparation method of the biochar and the biochar prepared by the preparation method adopt a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and specifically comprise the following steps:
(1) Cleaning agricultural and forestry biomass waste (straw waste), crushing into 90 meshes by a crusher, mixing with potassium acetate (32 g of potassium acetate, 16g of bamboo powder), adding deionized water (solid-to-liquid ratio: 500 g/L), placing in a hydrothermal reaction kettle, carbonizing at 190 ℃ for 4 hours, cooling, taking out, and drying to obtain the carbon-based material.
(2) Placing the carbon-based material in the step (1) in a corundum crucible, placing in a tubular muffle furnace, heating at 2 ℃/min, carbonizing at 800 ℃ for 3 hours, protecting with nitrogen (100 mL/min), cooling at 4 ℃/min, taking out after the temperature is reduced, grinding, pickling, washing with water, and drying to obtain the high-performance CO trapping material 2 Is a biochar of (a).
Example 4
The embodiment provides a high performance CO capture 2 The preparation method of the biochar and the biochar prepared by the preparation method adopt a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and specifically comprise the following steps:
(1) Cleaning agricultural and forestry biomass waste (bamboo waste), crushing into 100 meshes by a crusher, mixing with potassium formate and potassium acetate (8 g of potassium formate, 8g of potassium acetate and 16g of bamboo powder), adding deionized water (solid-liquid ratio: 300 g/L), placing in a hydrothermal reaction kettle, carbonizing at 200 ℃ for 2 hours, cooling, taking out, and drying to obtain the carbon-based material.
(2) Placing the carbon-based material in the step (1) in a corundum crucible, placing in a tubular muffle furnace, heating at 2 ℃/min, carbonizing at 900 ℃ for 2h, protecting with nitrogen (200 mL/min), cooling at 5 ℃/min, taking out after room temperature, grinding, pickling, washing with water, and drying to obtain the high-performance CO trapping material 2 Is a biochar of (a).
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
Claims (9)
1. High-performance CO trapping device 2 The biochar is characterized in that the micropore volume of the biomass charcoal occupiesThe proportion of the total pore volume is more than or equal to 76%, and the proportion of the micropore specific surface area to the total specific surface area is more than or equal to 79%.
2. A high performance CO capture according to claim 1 2 The biochar is characterized in that the proportion of the micropore volume of the biochar with the pore diameter smaller than 0.5nm to the total micropore volume is more than or equal to 19 percent.
3. A high performance CO trap as claimed in claim 1 or claim 2 2 The preparation method of the biochar is characterized by adopting a double catalysis and double carbonization process of potassium salt assisted hydrothermal carbonization and potassium salt assisted anaerobic thermal cracking, and specifically comprising the following steps:
s1: the potassium salt assists in hydrothermal carbonization: cleaning agricultural and forestry biomass waste, crushing to 80-100 meshes by a crusher, mixing with potassium salt, adding deionized water, placing in a hydrothermal reaction kettle, carbonizing at low temperature, cooling, taking out, and drying to obtain a carbon-based product;
s2: potassium salt assists in anaerobic thermal cracking: placing the carbon-based product in the S1 into a corundum crucible, placing the corundum crucible into a tubular muffle furnace, heating at a low speed, carbonizing at a high temperature, protecting with nitrogen in the whole process, cooling to room temperature at a low speed, taking out, grinding, pickling, washing with water, and drying to obtain the high-performance CO trapping product 2 Is a biochar of (a).
4. A high performance CO capture according to claim 3 2 The preparation method of the biochar is characterized in that the potassium salt comprises one or more of potassium formate and potassium acetate.
5. A high performance CO capture according to claim 4 2 The preparation method of the biochar is characterized in that in the step S1, the low-temperature carbonization temperature is 180-200 ℃ and the carbonization time is 2-4 hours; in the step S2, the temperature rising rate of low-speed temperature rising is 1-2 ℃/min, the high-temperature carbonization temperature is 700-900 ℃, the carbonization time is 1-4 h, and the temperature reducing rate of low-speed temperature reducing is 2-5 ℃/min.
6. A high performance CO capture according to claim 5 2 The preparation method of the biochar is characterized in that in the S2, the nitrogen flow is 50-200 mL/min.
7. A high performance CO capture according to claim 6 2 The preparation method of the biochar is characterized in that in the S1, the mass ratio of the potassium salt to the agriculture and forestry biomass waste is 0.5-2.
8. A high performance CO capture according to claim 7 2 The preparation method of the biochar is characterized in that in the step S1, the addition ratio of the agriculture and forestry biomass waste to the deionized water is 300-500 g/L.
9. The high performance CO capture of any one of claims 1-2 2 Use of the biochar of (c) and/or the preparation method of any of claims 3-8 in carbon capture, characterized in that the use comprises for capturing CO 2 。
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