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Composite catalyst based on conjugated microporous polymer, and preparation method and application thereof

A technology of composite catalysts and conjugated micropores, applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as poor hydrophobic performance and poor restart performance , to achieve the effect of good radiation resistance, improved life and restart performance

Active Publication Date: 2019-08-23
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the technical problems of poor hydrophobic performance and poor restart performance of existing precious metal catalysts, the purpose of the present invention is to provide a composite catalyst based on conjugated microporous polymers and its preparation and application. The method of the present invention not only maintains the original precious metal catalyst It has high catalytic performance, and at the same time makes the catalyst highly hydrophobic, ensuring the restart performance and service life of the material

Method used

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  • Composite catalyst based on conjugated microporous polymer, and preparation method and application thereof
  • Composite catalyst based on conjugated microporous polymer, and preparation method and application thereof
  • Composite catalyst based on conjugated microporous polymer, and preparation method and application thereof

Examples

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Embodiment 1

[0058] This example provides a conjugated microporous polymer-cordierite as a carrier and a Pt-loaded conjugated microporous polymer composite catalyst and its preparation method. The schematic diagram of the reaction route is as follows figure 1 Shown, the reaction steps are as follows:

[0059] (a) Acidification: Divide the cordierite into a cylindrical shape with a diameter of 20 mm and a diameter of 14 mm. The cross-section is honeycomb-shaped, and each cordierite weighs about 1.2727 g. Soak the cordierite in 20% nitric acid and shake it on a shaker for 24 hours. After 24 hours, the cordierite was washed with deionized water until the water was neutral, and then dried in a vacuum oven at 120° C. for 12 hours to obtain acidified cordierite.

[0060] (b) Ammonification: add 33g acidified cordierite and 250mL anhydrous toluene to the reaction flask, dissolve 30mL KH550 in 20mL anhydrous toluene, add dropwise to the reaction flask within four hours, and reflux at 80°C for 24h...

Embodiment 2

[0069] This example provides a hydrogen catalytic oxidation experiment of a composite catalyst of a conjugated microporous polymer. Hydrogen is an isotope of tritium, and its properties are similar to it. Therefore, the catalytic oxidation performance of the composite catalyst of the present invention for tritium can be obtained. The pressure drop of the honeycomb catalyst is 1-2 orders of magnitude lower than that of the granular catalyst, and it has a better amplification effect, which can greatly improve the processing capacity of the tritium removal system. In order to test the catalytic performance and gas handling capacity of the material, this embodiment tested the catalytic oxidation performance of the composite catalyst for hydrogen at different temperatures, initial hydrogen concentrations and space velocities. Methods as below:

[0070] Dry air and air containing 10% hydrogen are used as the processing gas, and the flow rate and hydrogen concentration of air and hyd...

Embodiment 3

[0074] This example provides the restart performance of the composite catalyst of the conjugated microporous polymer. The catalyst is placed in the hydrogen monitoring system, and the initial concentration of hydrogen is 1000ppm, and the flow rate is 0.3L min -1 , temperature 30°C and space velocity 3000h -1 , under the condition that the material volume is 6mL, by controlling the flow time of hydrogen in the system, the catalyst is catalyzed in hydrogen for two hours and then the catalyst is suspended for two hours. Repeat this operation 5 times to test the restart performance of the material. Experimental results Figure 10 shown. Figure 10 (A) and (B) respectively show the effects of Pt-CMPI@C3 continuous catalysis for 12 h and 5 times of start and stop on the conversion efficiency of the catalyst. The results showed that the hydrogen catalytic ability of the Pt-CMPI@C3 composite catalyst remained above 99.6% without significant decline after 12 hours of continuous opera...

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Abstract

The invention relates to a composite catalyst based on a conjugated microporous polymer, and a preparation method and an application thereof. The preparation method comprises the following steps: acidifying an inert carrier, and then reacting the acidified inert carrier with a silane coupling agent to obtain a carrier having an amino group-modified surface; reacting the carrier having the amino group-modified surface with halogenated benzaldehyde to obtain a halogenated carrier; carrying out a coupling reaction on the halogenated carrier, a first monomer and a second monomer under the action of a catalyst to obtain a conjugated microporous polymer-modified carrier; and contacting the conjugated microporous polymer-modified carrier with an organic solution of a noble metal salt, and carrying out a hydrogen reduction reaction to obtain the composite catalyst based on the conjugated microporous polymer. The conjugated microporous polymer with high radiation resistance and high hydrophobicity is loaded on the surface of the inert carrier to form a matrix for loading the noble metal in order to improve the catalytic performance and the restart performance of the noble metal catalyst, and the composite catalyst is used for catalytic oxidation of hydrogen and its isotopes.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a composite catalyst based on a conjugated microporous polymer and its preparation and application. Background technique [0002] There are three isotopes of hydrogen, among them, tritium is a radionuclide with a half-life of 12.33 years, and decays to emit β-rays with an average energy of 5.7 KeV. Although the β rays produced by the decay of tritium have low energy, tritium has a very large specific activity (3.56x10 14 Bq / g), can enter the human body through various channels such as skin, breathing, food and water, and has obvious biological effects. Tritium leaked into the environment has strong mobility and circulation in the biosphere, and is transformed into tritium water and tritium compounds through oxidation reactions and exchange reactions; tritium water is 25,000 times more radioactive to humans and organisms than gaseous tritium. Therefore, a small amount of tritium leakage...

Claims

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Application Information

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IPC IPC(8): B01J31/06B01J31/26C01B5/00C01B5/02
CPCB01J31/06B01J31/26C01B5/00C01B5/02
Inventor 华道本徐美芸王涛
Owner SUZHOU UNIV
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