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Sandwich-structured solid amine CO2 adsorbent and preparation method thereof

A sandwich and adsorbent technology, applied in the field of sandwich structure solid amine CO2 adsorbent and its preparation, can solve the problems of reduced effective utilization rate of amine, increased diffusion resistance, loss of adsorption sites, etc., so as to improve utilization rate and avoid clogging , the effect of high specific surface area

Inactive Publication Date: 2018-09-28
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Solid amine adsorbents often adopt the impregnation method to modify solid porous materials with amino groups, but the impregnation method tends to make organic amines adhere to the pore openings and outer surfaces of porous materials, blocking the pore structure and making CO 2 The diffusion resistance of molecules to the internal active sites increases, and the effective utilization rate of amines decreases; in addition, organic amines are easy to decompose and escape during multiple adsorption-desorption cycles in the adsorbent prepared by impregnation method, resulting in the loss of adsorption sites , the adsorption amount decreases; therefore, improving the dispersion of organic amines in the pore structure and increasing the binding strength of organic amines to porous substrates are the focus of current research on solid-state amine adsorbents.

Method used

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  • Sandwich-structured solid amine CO2 adsorbent and preparation method thereof
  • Sandwich-structured solid amine CO2 adsorbent and preparation method thereof
  • Sandwich-structured solid amine CO2 adsorbent and preparation method thereof

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Embodiment 1

[0031] Graphene oxide (GO) is used as the substrate, the cyclohexane solution of tetraethyl orthosilicate (TEOS) is used as the silicon source, and cetyltrimethylammonium chloride (CTAC) is used as the cationic surfactant. The oil-water layer method Preparation of sandwich structure composites: First, GO powder was ultrasonically dispersed into 100 mL deionized water to obtain a GO dispersion with a concentration of 0.12 mg mL -1; Add 40 mg of NaOH to the dispersion, and stir at 100 °C for 1 h; then add 1.92 g of CTAC, and continue to stir at 100 °C for 3 h; then add 21 mL of TEOS (10 v%) cyclohexane The alkane solution was added dropwise to the above reaction solution, and stirred at 100°C for 24 h; the obtained product was mixed with 100 mL of 0.6 wt% NH 4 NO 3 ethanol solution, stirred vigorously at 80 °C for 24 h to remove the surfactant; GO reduction was performed with 50 mL of 45 wt% HI solution to obtain mSiO 2 @GNs sandwich structure composite materials;

[0032] mS...

Embodiment 2

[0035] Using GO as the substrate, TEOS cyclohexane solution as the silicon source, and CTAC as the cationic surfactant, the sandwich structure composite material was prepared by the oil-water layering method: first, the GO powder was ultrasonically dispersed into 100 mL deionized water to obtain the GO dispersion. Concentration of 1.2 mg mL -1 ; Add 40 mg of NaOH to the dispersion, and stir at 100 °C for 1 h; then add 1.92 g of CTAC, and continue to stir at 100 °C for 3 h; then add 21 mL of TEOS (10 v%) ring The hexane solution was added dropwise to the above reaction solution, and stirred at 100°C for 24 h; the obtained product was mixed with 100 mL of 0.6 wt% NH 4 NO 3 ethanol solution, stirred vigorously at 80 °C for 24 h to remove the surfactant; GO was reduced with 50 mL of 45 wt% HI solution to obtain mSiO 2 @GNs sandwich structure composite materials;

[0036] mSiO 2 The TEM images of @GNs sandwich structure composite materials show that a relatively uniform lamella...

Embodiment 3

[0039] Using GO as the substrate, TEOS cyclohexane solution as the silicon source, and CTAC as the cationic surfactant, the sandwich structure composite material was prepared by the oil-water layering method: first, the GO powder was ultrasonically dispersed into 100 mL deionized water to obtain the GO dispersion. Concentration is 0.3 mg mL -1 ; Add 40 mg of NaOH to the dispersion, and stir at 100 °C for 1 h; then add 1.92 g of CTAC, and continue to stir at 100 °C for 3 h; then add 21 mL of TEOS (10 v%) ring The hexane solution was added dropwise to the above reaction solution, and stirred at 100°C for 24 h; the obtained product was mixed with 100 mL of 0.6 wt% NH 4 NO 3 ethanol solution, stirred vigorously at 80 °C for 24 h to remove the surfactant; GO was reduced with 50 mL of 45 wt% HI solution to obtain mSiO 2 @GNs sandwich structure composite materials;

[0040] mSiO 2 SEM and TEM images of @GNs sandwich structure composites ( figure 1 ) shows that a lamellar sandwic...

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Abstract

The invention discloses a sandwich-structured solid amine CO2 adsorbent. Graphene is taken as a supporting substrate of the adsorbent, mesoporous silica grows on the upper surface and the lower surface of the supporting substrate to obtain a mesoporous silica / graphene sandwich structure, and -NH2 groups are introduced on the surfaces and pore walls of the silica by using a self-assembled monomolecular layer modifying technology in a 'Si-O-Si' covalent bond mode to obtain an ammonia functionalized mesoporous silica / graphene sandwich-structured composite material. The invention further disclosesa preparation method of the adsorbent. The sandwich-structured solid amine CO2 adsorbent has the beneficial effects that from the point of view of thermodynamics and kinetics, a reasonable adsorbentstructure is designed, a preparation process is safe and controllable, the prepared sandwich-structured solid amine adsorbent has high specific surface area and effective hierarchical pore distribution, -NH2 which is grafted in a covalent bond mode can be highly dispersed in pores with different sizes, blockage of pore channels is avoided as much as possible, and the utilization rate of amine is increased effectively.

Description

technical field [0001] The invention belongs to CO 2 Adsorption technology field, relates to a kind of sandwich structure solid amine CO 2 An adsorbent and a preparation method thereof. The adsorbent is prepared by an oil-water layering method and a self-assembled monomolecular layer modification technique (SAMMS). Background technique [0002] The combustion of fossil fuels such as coal, oil, and natural gas makes CO in the atmosphere 2 The increasing concentration has caused a series of irreversible ecological problems that threaten the survival and development of human beings. Therefore, CO 2 The control of emissions has attracted the attention of countries all over the world, so appropriate means should be used to rationally use and capture CO 2 Significant. [0003] At present, it has been successfully applied to capture and store CO 2 The current technologies include: alcohol amine solution absorption method, metal compound absorption method, molecular sieve adso...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/22B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/103B01J20/20B01J20/22B01J20/28042B01J20/28057B01J20/28069B01J20/28083Y02C20/40
Inventor 许珊刘莉杨本群邹国军雒旭
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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