CN113209951A - Monolithic structure adsorbent based on amine functionalized silica sol, preparation method and application - Google Patents

Monolithic structure adsorbent based on amine functionalized silica sol, preparation method and application Download PDF

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CN113209951A
CN113209951A CN202110484154.2A CN202110484154A CN113209951A CN 113209951 A CN113209951 A CN 113209951A CN 202110484154 A CN202110484154 A CN 202110484154A CN 113209951 A CN113209951 A CN 113209951A
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adsorbent
silica sol
polyethyleneimine
monolithic
amine
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葛天舒
吴俊晔
朱炫灿
杨凡
王如竹
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Shanghai Jiaotong University
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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
    • B01J20/28014—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 form
    • B01J20/28042—Shaped bodies; Monolithic structures
    • 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
    • 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
    • B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
    • B01J20/103—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate comprising silica
    • 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
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/261—Synthetic macromolecular compounds obtained by reactions only involving carbon to carbon unsaturated bonds
    • 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
    • B01J20/28002—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 physical properties
    • B01J20/28011—Other properties, e.g. density, crush strength
    • 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
    • B01J20/28014—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 form
    • B01J20/28042—Shaped bodies; Monolithic structures
    • B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
    • 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
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/32—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating
    • B01J20/3202—Impregnating or coating ; Solid sorbent compositions obtained from processes involving impregnating or coating characterised by the carrier, support or substrate used for impregnation or coating
    • B01J20/3204—Inorganic carriers, supports or substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • 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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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

The invention discloses an overall structure adsorbent based on amine functionalized silica sol, a preparation method and application. The monolithic adsorbent comprises polyethyleneimine, silica sol and honeycomb ceramic. The preparation method comprises the steps of mixing polyethyleneimine with silica sol, and adhering solid amine to the surface of the honeycomb ceramic in a dip-coating manner. The structural adsorbent can be applied to carbon dioxide adsorption separation in different scenes such as direct air capture, capture after combustion and the like. The structural adsorbent prepared by the method has the characteristics of small airflow pressure drop, good heat and mass transfer performance, high mechanical strength, easy structure adjustment, good stability, simple manufacturing process, low cost and the like. The manufacturing process does not involve solid powder, so the problems of powder falling and uneven coating are avoided, and the method is suitable for industrial application.

Description

Monolithic structure adsorbent based on amine functionalized silica sol, preparation method and application
Technical Field
The invention relates to a method for CO2An adsorbent with integral structure based on amine functional silica sol, in particular to an adsorbent for CO2A preparation method of an adsorptive dip-coating type adsorbent with an integral structure belongs to the fields of chemical engineering and environmental protection.
Background
Carbon capture technology is gaining increasing attention as a means of mitigating climate change associated with increased carbon dioxide emissions. The use of solid amine materials for carbon dioxide capture has been extensively studied because the amine groups can chemically react with carbon dioxide. Many porous materials, including silica, alumina, activated carbon, Metal Organic Frameworks (MOFs) are used as supports for solid amine materials. They exhibit excellent performance in different scenarios, including post-combustion Capture (CO)2Volume fraction of 5-30%), decarbonization in enclosed space (CO)2Volume fraction of 0.1% -0.3%), direct air Capture (CO)2Volume fraction of 0.04%), etc. However, most of the carbon dioxide adsorbents are prepared in the form of powder or granules, which is inconvenient in practical industrial application. When they are packed tightly in a fixed bed, they cause a large resistance to the flow of air, thus increasing the fan power consumption, especially at low CO flows where a large treat gas flow is required2In a concentration scenario. In addition, packed powdered adsorbents tend to have poor heat and mass transfer properties that are detrimental to the performance of the temperature swing adsorption process adsorption/regeneration cycle and may have an impact on adsorption rates.
The structured adsorbent can effectively reduce the pressure drop of the airflow, improve the heat and mass transfer performance and facilitate the industrial application of the adsorbent. Referring to the current literature at home and abroad, the structural adsorbent is mainly prepared by three ways: 3D printing, extrusion, and dip coating. The 3D printing method is characterized in that a structural model is established in advance, and a material formed by mixing an adsorbent and an adhesive is made into the adsorbent with a three-dimensional structure in a layer-by-layer printing mode. The structural design of the process is relatively free and does not require additional material cutting and removal. The extrusion method mixes the adsorbent and the adhesive to obtain a mud blank, then applies pressure, and presses the mud blank into the structural adsorbent by using a mould. The advantages are high strength and good stability of the finished product. The dip coating method is to dip the commercialized honeycomb ceramic into the pre-prepared slurry, and after blowing and drying, the adsorbent is adhered to the surface of the honeycomb ceramic to prepare the monolithic structural adsorbent. Compared with the preparation methods of the adsorbents with the two structures, the preparation method has the advantages of simple preparation process, low cost and easy industrial amplification. However, if the powdered adsorbent is mixed with the binder to form a slurry, the solid may fall off, and the adsorbent may not be uniformly distributed. The large-scale application of the structural adsorbent needs to comprehensively consider the problems of cost, process complexity, product adsorption performance, service life and the like of a manufacturing method.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an adsorbent with an integral structure based on amine functionalized silica sol, a preparation method and application. The method mixes polyethyleneimine with liquid silica sol to prepare colloidal SiO with molecular level contained in the silica sol2Carrying an amino group thereon. And then coating the amine functionalized silica sol on the surface of the honeycomb ceramic in a dip coating mode by utilizing the viscosity of the silica sol, and blowing and drying to obtain the integral structure adsorbent. The adsorbent can be used for CO in different scenes2The device has the advantages of small airflow pressure drop, good heat and mass transfer performance, high mechanical strength, high stability, simple manufacturing process, low cost and the like. The manufacturing process does not involve solid powder, so the problems of powder falling and uneven coating are avoided, and the method is suitable for industrial application.
Compared with the patent and paper result report of the existing amine functionalized silica adsorbent, the invention has the following differences: (1) in the invention, the carrier of the amine is liquid silica sol, so the amine functionalized silica sol can be conveniently combined with honeycomb ceramics with a certain structure, and the flexibility is high. (2) Unlike granular or powdered adsorbents, the structured adsorbent of the present invention has certain structure and mechanical strength, and may be used directly as part of adsorption apparatus in trapping system without depending on fixed bed or fluidized bed. (3) The manufacturing method is a dip coating method, and compared with a 3D printing and extrusion molding method, the manufacturing method is simpler and more convenient in process, lower in cost and easy to realize large-scale application.
In order to achieve the above object, the present invention is achieved by the following aspects:
in a first aspect, the present invention provides an amine-functionalized silica sol-based monolithic adsorbent, comprising polyethyleneimine, silica sol and honeycomb ceramic;
when the mass of the polyethyleneimine is x, SiO contained in the silica sol2When the mass of (a) is y, the mass fraction w of polyethyleneimine is 30% to 90%, wherein w is x/(x + y).
Preferably, the material of the honeycomb ceramic is selected from one or more of cordierite, mullite, aluminum titanate, silicon carbide, zirconia, silicon nitride, ceramic fiber, a cordierite-mullite composite matrix and a cordierite-aluminum titanate composite matrix.
Preferably, the silica sol contains SiO2The mass fraction of (A) is 20-60%.
Preferably, the polyethyleneimine is branched or straight-chain type, and the molecular weight is 300-70000.
More preferably, the polyethyleneimine has a purity of 99%, a branched structure and a molecular weight of 600.
In the present application, the molecular weight refers to a number average relative molecular weight.
Preferably, the monolithic adsorbent is adsorbing CO2When in gas, the adsorption temperature is 10-85 ℃, and the desorption temperature is 90-150 ℃; the adsorbent is used for CO2CO in adsorbed gas of gas adsorption2The volume fraction of (A) is 0.04-100%.
In a second aspect, the present invention provides a method for preparing the monolithic adsorbent, comprising the following steps:
step S1: mixing polyethyleneimine and silica sol in a solution at normal temperature and uniformly stirring to obtain a soaking solution;
step S2: putting the honeycomb ceramic into the soaking solution obtained in the step S1 to be completely immersed, and standing for 12-36 h;
step S3: taking out the honeycomb ceramics after standing, and drying the honeycomb ceramics in vacuum at 70-90 ℃ to obtain the final adsorbent with the integral structure.
Preferably, in the step S1, the solution is deionized water.
Preferably, in the step S1, the mass ratio of the volume of the added solution to the silica sol is 1: 1.
Preferably, in the step S3, the drying time is 12 to 24 hours.
In a third aspect, the invention also provides the application of the monolithic adsorbent based on the amine-functionalized silica sol, which is used for adsorbing CO2A gas.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the solid amine is adhered to the honeycomb ceramic in a dip coating mode, and the solid amine can be uniformly and stably combined with the honeycomb ceramic due to no powder or particles, so that the structural adsorbent has high mechanical strength and long service life.
(2) Compared with a fixed bed adsorption device, the structural adsorbent has the advantages of small air flow pressure drop and good heat and mass transfer performance, so that the energy consumption can be effectively reduced.
(3) Structural adsorbents for CO due to the chemisorption mechanism of solid amines2The method has high adsorption selectivity, and the existence of water vapor can not damage the structure of the adsorbent, but can increase the adsorption capacity and inhibit the degradation of amine.
(4) The shape and size of the structural adsorbent can be adjusted as required, and the structural adsorbent can be flexibly applied to different scenes.
(5) The preparation method is simple, the cost is low, and the industrial amplification is easy.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a flow chart of a process for making an amine functionalized silica sol based monolithic adsorbent;
FIG. 2 is a photograph of a sample of a monolithic adsorbent based on an amine-functionalized silica sol;
FIG. 3 shows the results of Fourier transform Infrared absorption Spectroscopy (FTIR) measurements on samples with a polyethyleneimine mass fraction w of 80%;
FIG. 4 shows the results of a thermogravimetric analysis (TGA) test of a sample having a polyethyleneimine mass fraction w of 50%;
FIG. 5 shows the results of the test of compressive mechanical strength with polyethyleneimine mass fractions w of 40%, 50%, 60% and 70%;
FIG. 6 is the nitrogen mass fraction of the example and comparative samples;
FIG. 7 is a graph of adsorption rates for the example and comparative samples;
the reference numerals in fig. 1 mean: 1-polyethyleneimine; 2-deionized water; 3-silica sol; 4-aqueous polyethyleneimine solution; 5-honeycomb ceramics; 6-soak solution; 7-structural adsorbent.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
FIG. 1 is a process for making an amine functionalized silica sol based monolithic structure adsorbent. As shown in fig. 1, in the monolithic adsorbent of the present invention, the preparation method comprises the following steps:
step 1: dripping polyethyleneimine 1 into deionized water 2, and stirring until the polyethyleneimine is completely dissolved;
step 2: dropping the silica sol 3 into the solution (namely the polyethyleneimine water solution 4) obtained in the step 1, and uniformly stirring to form uniform and stable soaking solution 6;
and step 3: immersing the honeycomb ceramics 5 into the soaking solution 6, standing for 12h, and taking out;
and 4, step 4: and throwing off the redundant soaking solution 6, putting the soaked solution into a vacuum drying oven, drying the soaked solution at the temperature of 80 ℃ for 12 hours, and taking the dried solution out to obtain the adsorbent 7 with the integral structure.
The sample morphology of the monolithic adsorbent obtained can be seen in fig. 2, which is a photograph of a sample of a monolithic adsorbent based on amine-functionalized silica sol.
For specific component ratios, see examples 1-3 below.
Example 1
9.6g of polyethyleneimine (purity 99%, branched chain type, molecular weight 600) was added dropwise to 8g of deionized water, and the mixture was stirred until the polyethyleneimine was completely dissolved. 8g of silica Sol (SiO)230 percent of the total weight of the components) is dropped into the water solution of the polyethyleneimine, and the mixture is stirred to form uniform and stable soaking liquid. Putting a piece of honeycomb ceramic (20mm multiplied by 8mm) made of ceramic fiber materials into the soaking solution to be completely immersed, taking out after standing for 12h, lightly throwing off the redundant soaking solution, then putting the honeycomb ceramic into a vacuum drying oven, drying for 12h at the temperature of 80 ℃, and taking out to obtain the structural adsorbent. FTIR tests were performed on the structured adsorbent and the results are shown in FIG. 3, FIG. 3 is the FTIR test results for a sample with a polyethyleneimine mass fraction w of 80%. At 3416cm-1And 1570cm-1An absorbance peak was observed at each of the two peaks, which respectively correspond to-NH2and-NH, confirming that the amine group was indeed carried on the structural adsorbent.
Example 2
The procedure was as in example 1, except that 2.4g of polyethyleneimine was used.
TGA 8000(Perkin Elmer) was used in10％CO2(volume fraction, remainder N)2) The adsorption rate of the structural adsorbent in an atmosphere of 75 ℃ is measured, and the results are shown in FIG. 4, and FIG. 4 is a TGA measurement result of a sample with a polyethyleneimine mass fraction w of 50%.
When the mass fraction w of polyethyleneimine is 50%, the adsorption capacity of the structural adsorbent reaches 0.437mmol/g after adsorption for 1 hour in the flue gas atmosphere, so that the adsorbent with the integral structure has the advantages of good adsorption efficiency, small air flow pressure drop and good heat and mass transfer.
Example 3
The procedure is as in example 1, except that 1.6g, 2.4g, 3.6g, and 5.6g of polyethyleneimine are added to prepare 4 structured adsorbents having mass fractions w of 40%, 50%, 60%, and 70%, respectively. The compressive mechanical strength of the structural adsorbent was measured using a TADMAQ850(Perkin Elmer) dynamic thermo-mechanical strength analyzer, and the results are shown in fig. 5, and fig. 5 shows the results of the compressive mechanical strength test with polyethyleneimine mass fractions w of 40%, 50%, 60%, and 70%. In the figure, the abscissa is strain (%) of the structural adsorbent, the ordinate is pressure (MPa) applied to the adsorbent, and the compression direction is as shown in fig. 5, and the young's modulus under compression of each sample is calculated from the slope of the curve, ranging from 5.023MPa to 56.667MPa, indicating that the structural adsorbent has high mechanical strength.
Example 4
The same procedure as in example 1 was followed, except that the mass fraction of polyethyleneimine was adjusted to 30% w of the structural adsorbent, and this was referred to as a sample. In addition, a method of dip-coating silica sol and then dip-coating polyethyleneimine is adopted to prepare a comparative sample, namely: (1) taking a piece of honeycomb ceramic (20mm multiplied by 8mm) made of ceramic fiber material, and putting the honeycomb ceramic into SiO2Completely immersing the silica sol with the content of 30 percent in the silica sol, and standing for 12 hours; (2) taking out and drying in a forced air drying oven for 8 h; (3) putting the honeycomb ceramic dipped with the silica sol into an aqueous solution with the mass fraction of polyethyleneimine of 30% to be completely immersed, and standing for 12 hours; (4) after being taken out, the sample is dried in a vacuum drying oven for 12 hours at the temperature of 80 ℃ to obtain a comparative sample.
The test results of the nitrogen mass fraction of the working sample and the comparative sample in an element analyzer (variao EL Cube) are shown in fig. 6, and fig. 6 is the nitrogen mass fraction of the working sample and the comparative sample. Since the honeycomb ceramic does not contain nitrogen element, and the main component of the amine group is the nitrogen element, the load of the polyethyleneimine can be measured by the mass fraction of the nitrogen element. As can be seen from fig. 6, the nitrogen mass fraction of the working sample was 11.967%, and the nitrogen mass fraction of the comparative sample was 9.442%, and thus it can be seen that the nitrogen content of the working sample was higher than that of the comparative sample, indicating that the method of the present invention enables the structural adsorbent to be loaded with more amine.
The samples performed were subjected to TGA adsorption tests with comparative samples, which were at 10% CO2The result of the adsorption in the atmosphere for 1 hour is shown in FIG. 7, and FIG. 7 is a graph showing adsorption rate curves of the example and the comparative sample. As can be seen from FIG. 7, the maximum adsorption amounts of the sample and the comparative sample are 0.371mmol/g and 0.152mmol/g, respectively, which illustrates the key steps in the present invention, i.e., the method of mixing polyethyleneimine with silica sol and then dip-coating can effectively load amine groups in the structural adsorbent to obtain larger CO2The adsorption capacity is limited by the way of first dipping silica sol and then dipping polyethyleneimine, so that a large amount of amine groups are difficult to load in the silica sol.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.

Claims (10)

1. An amine-functionalized silica sol-based monolithic adsorbent, comprising polyethyleneimine, silica sol, and honeycomb ceramic;
when the mass of the polyethyleneimine is x, SiO contained in the silica sol2When the mass of (b) is y, the mass fraction w of polyethyleneimine is 30-90%, whereinw＝x/(x+y)。
2. The monolithic structural adsorbent of claim 1 wherein the honeycomb ceramic is made of one or more materials selected from the group consisting of cordierite, mullite, aluminum titanate, silicon carbide, zirconia, silicon nitride, ceramic fiber, and a cordierite-mullite composite matrix and a cordierite-aluminum titanate composite matrix.
3. The monolithic structure sorbent according to claim 1, wherein the silica sol comprises SiO2The mass fraction of (A) is 20-60%.
4. The monolithic adsorbent structure of claim 1 wherein the polyethyleneimine is branched or linear and has a molecular weight of 300 to 70000.
5. The monolithic structural adsorbent of claim 1, wherein said monolithic structural adsorbent is adsorbing CO2When in gas, the adsorption temperature is 10-85 ℃, and the desorption temperature is 90-150 ℃; the adsorbent is used for CO2CO in adsorbed gas of gas adsorption2The volume fraction of (A) is 0.04-100%.
6. A method for preparing a monolithic structure adsorbent according to any one of claims 1 to 5, characterized in that it comprises the following steps:
step S1: mixing polyethyleneimine and silica sol in a solution at normal temperature and uniformly stirring to obtain a soaking solution;
step S2: putting the honeycomb ceramic into the soaking solution obtained in the step S1 to be completely immersed, and standing for 12-36 h;
step S3: taking out the honeycomb ceramics after standing, and drying the honeycomb ceramics in vacuum at 70-90 ℃ to obtain the final adsorbent with the integral structure.
7. The method according to claim 6, wherein in the step S1, the solution is deionized water.
8. The production method according to claim 6, wherein in the step S1, the ratio of the volume of the addition solution to the mass of the silica sol is 1: 1.
9. The method according to claim 6, wherein in the step S3, the drying time is 12 to 24 hours.
10. Use of a monolithic sorbent based on amine-functionalized silica sol according to any one of claims 1 to 5 for the adsorption of CO2A gas.
CN202110484154.2A 2021-04-30 2021-04-30 Monolithic structure adsorbent based on amine functionalized silica sol, preparation method and application Pending CN113209951A (en)

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JPS59147639A (en) * 1983-02-10 1984-08-24 Toyo Soda Mfg Co Ltd Adsorbent for recovering bromine and method for recovering bromine
US5194414A (en) * 1991-01-21 1993-03-16 Toshimi Kuma Method of manufacturing a gas absorbing element or a catalyst carrier having a honeycomb structure
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