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Covalent organic framework catalyst as well as preparation method and application thereof

A covalent organic framework and catalyst technology, applied in the direction of organic compound/hydride/coordination complex catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of uneven distribution of active components and uneven adsorption capacity Advanced problems, to achieve the effect of short preparation time, simple process, and easy access to raw materials

Pending Publication Date: 2021-11-12
安徽省池州生态环境监测中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In dry dephosphorization, traditional adsorbents such as activated carbon, molecular sieves, and hydrotalcites have the disadvantage of low adsorption capacity. Commonly used supported catalysts such as carbon-based materials loaded with metal oxides, and alumina loaded with active components Or silicon oxide-based materials, etc. have the disadvantage of uneven distribution of active components

Method used

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  • Covalent organic framework catalyst as well as preparation method and application thereof
  • Covalent organic framework catalyst as well as preparation method and application thereof
  • Covalent organic framework catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0025] The present invention provides a method for preparing covalently-organic framework catalyst, comprising the steps of:

[0026] Mixing the first small molecule proton formaldehyde precursor, three amino anilines ligand and a solvent, a condensation reaction, to give a covalent organic frameworks polygonal vehicle; the small molecule-based formaldehyde precursor for the phthalaldehyde, trimesic pyromellitic formaldehyde or formaldehyde;

[0027] The polygon covalent organic vehicle frame, and a second metal oxide nano-protic solvent mixture, load, type of load to obtain covalent organic framework material; nano-sized metal oxide comprises nano transition metal oxide and rare earth metal oxide thing;

[0028] The supported covalent organic framework materials, sodium sulfate solution, and the third mixed protic solvent, a substitution reaction, to give a covalent organic framework catalyst.

[0029] Unless otherwise specified, the present invention has no special requirements ...

Embodiment 1

[0063] Terephthalic dialdehyde and 4,4 ', 4 "- triamino triphenylamine molar ratio of 1: 0.5 mixture dissolved in DMF, was stirred at room temperature for 30min, stirring rate 500r / min, and then placed in a rotary evaporator obtained polygon covalent organic frameworks vehicle rotary evaporation at 95 deg.] C for 45 min, evaporated to dryness and crystallized; the polygons covalent organic frameworks support, the nano metal oxide particles (Fe 2 O 3 And CeO 2The mass ratio is 100: 2) is mixed in anhydrous ethanol according to mass ratio 20: 2, stirred at room temperature for 10 min, and the rate of stirring is 600 r / min, then placed in a rotary evaporator at 50 ° C to steam 30min The evaporation crystallization is obtained by a covalent organic frame material; the load type is covalently organically organic frame material, sodium sulfate, sulfuric acid solution (0.5% mass concentration) is mixed according to mass ratio 100: 2.5: 1 mixed in anhydrous ethanol. The mixture was st...

Embodiment 2

[0065] The ion benzophenylmeraldehyde and 4, 4, 4 "- trisopenamine were mixed in DMF by mixing in DMF, stirred at room temperature for 30 min, and stirred at a rate of 1000 r / min, then placed in a rotary evaporator In 80 ° C, evaporation of 20 min, evaporate crystallization to give a polygon covalent organic frame carrier; covalent organic frame carrier, nano metal oxide particles (Cuo and CEO) 2 The mass ratio is 100: 10) is mixed in anhydrous ethanol by mass ratio 20: 1, stirred at room temperature for 8 min, and the rate of stirring is 1200 r / min, then placed in a rotary evaporator at 60 ° C to steam 20 minutes. The evapoction crystallization is obtained by a covalent organic frame material; the load type is covalently organically organic frame material, sodium sulfate, sulfuric acid solution (1.5% mass concentration) is mixed in a mass ratio of 100: 5: 2 mixed in anhydrous ethanol. The mixture was stirred at room temperature for 10 min, and the stirred rate was 500 r / min...

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Abstract

The invention belongs to the technical field of air pollution control, and particularly relates to a covalent organic framework catalyst as well as a preparation method and application thereof. A covalent organic framework carrier prepared from a micromolecular formaldehyde precursor and a triaminoaniline ligand is of a polygonal framework structure and has more cage-shaped pores, so that the covalent organic framework carrier has the characteristics of high specific surface area and high adsorption capacity; due to the huge specific surface area, more metal oxide particle active components can be loaded, so that the catalytic oxidation selectivity on hydrogen phosphide is improved; Na<+> can promote dispersion of the nano metal oxide on the polygonal covalent organic framework carrier, so that active components of metal oxide particles are uniformly distributed; and introduction of SO4 < 2-> can increase the number of oxidation functional groups bonded on the covalent organic framework carrier, promote adsorption of more PH3 on the surface of the covalent organic framework material carrier and improve the oxidation effect on PH3, thereby realizing efficient removal of PH3.

Description

Technical field [0001] The present invention belongs to the technical field of air pollution control, in particular to a covalent organic framework catalyst and preparation method and application. Background technique [0002] Phosphine (PH 3 ) Is a colorless, toxic, flammable gas chemistry, mainly from metal and nonmetal mining and metallurgy smelting reduction process. When the phosphine encountered traces of other phosphorus hydrides such as ethyl phosphine, giving rise to autoignition, and can cause catalyst poisoning. Meanwhile, inhaled phosphine have heart, respiratory, kidney, stomach, liver and nervous system affected. Therefore, phosphine removal has become a problem of industrial emissions and the use of exhaust gas purification needed to solve. [0003] PH 3 The removal process is divided into dry and wet. Wherein high wet dephosphorization efficiency, but the presence of high operating costs, and many kinds of by-products and other shortcomings of discontinuous operat...

Claims

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Application Information

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IPC IPC(8): B01J31/22C08G83/00B01D53/86B01D53/46
CPCB01J31/1691B01J31/1815C08G83/008B01D53/8671B01J2531/16B01J2531/31B01J2531/38B01J2531/842Y02A50/20
Inventor 陈小娇李凯孙鑫宋辛
Owner 安徽省池州生态环境监测中心
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