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MXene-ACF composite material for catalyzing hydrochlorination reaction of acetylene as well as preparation method and application of MXene-ACF composite material

A technology of acetylene hydrochlorination and composite materials, which is applied in the field of MXene-ACF composite materials and its preparation, can solve the problems of restricting the excellent characteristics of MXene, MXene stacking and agglomeration, and decreasing electrical conductivity, and achieves acetylene conversion rate and vinyl chloride selectivity. High, improve catalytic performance, good stability

Pending Publication Date: 2022-03-11
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MXene is easily oxidized in the air or under high temperature conditions, resulting in a sharp drop in its electrical conductivity, and similar to other two-dimensional materials, MXene is prone to stacking and agglomeration, which greatly restricts the excellent properties of MXene and severely limits them. Applications in the field of catalysis

Method used

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  • MXene-ACF composite material for catalyzing hydrochlorination reaction of acetylene as well as preparation method and application of MXene-ACF composite material
  • MXene-ACF composite material for catalyzing hydrochlorination reaction of acetylene as well as preparation method and application of MXene-ACF composite material
  • MXene-ACF composite material for catalyzing hydrochlorination reaction of acetylene as well as preparation method and application of MXene-ACF composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method and application of an MXene-ACF composite material for acetylene hydrochlorination, comprising the following steps:

[0037] 1) Add 1g of LiF powder to 20ml of HCl solution with a concentration of 8mol / L, fully dissolve and then slowly add 1g of MAX powder, in an oil bath at 20°C assisted by 20kHz ultrasonic waves, stirring at a rate of 500r / min, stirring and etching for 8h Finally, use deionized water to repeatedly centrifuge and wash at a speed of 2000rpm, the washing time is 30min, and wash to pH=6 to obtain multi-layer MXene precipitation;

[0038] 2) Redisperse the multi-layer MXene precipitate into deionized water to form a 4mg / mL suspension, then dry 10g of ACF in an oven at 100°C for 6h and then cut it into pieces of 1cm*1cm*0.1cm. ACF is immersed in the suspension to form MXene / ACF through electrostatic self-assembly;

[0039] 3) Take out the obtained MXene / ACF at a wavelength of 280nm and an intensity of 40μW / cm 2 Vacuum drying at 40°C for...

Embodiment 2

[0042] A preparation method and application of an MXene-ACF composite material for acetylene hydrochlorination, comprising the following steps:

[0043] 1) Add 1g of LiF powder to 30ml of HCl solution with a concentration of 9mol / L, fully dissolve and then slowly add 1g of MAX powder, in an oil bath at 30°C assisted by 30kHz ultrasonic waves, stirring at a rate of 600r / min, stirring and etching for 12h Finally, use deionized water to repeatedly centrifuge and wash at a speed of 3000rpm, the washing time is 60min, and wash to pH=6 to obtain multi-layer MXene precipitation;

[0044] 2) Redisperse the multi-layered MXene precipitate into deionized water to form a 4mg / mL suspension, then dry 10g of ACF in an oven at 100°C for 8 hours and cut it into pieces of 1.5cm*1.5cm*0.1cm. The ACF is immersed in the suspension to form MXene / ACF through electrostatic self-assembly;

[0045] 3) Take out the obtained MXene / ACF at a wavelength of 250nm and an intensity of 40μW / cm 2 Vacuum dryin...

Embodiment 3

[0048] A preparation method and application of an MXene-ACF composite material for acetylene hydrochlorination, comprising the following steps:

[0049] 1) Add 2g of LiF powder to 40ml of HCl solution with a concentration of 8mol / L, fully dissolve and then slowly add 2g of MAX powder, in an oil bath at 40°C assisted by 40kHz ultrasonic waves, stirring at a rate of 700r / min, stirring and etching for 14h Finally, use deionized water to repeatedly centrifuge and wash at a speed of 3000rpm, the washing time is 60min, and wash to pH=6 to obtain multi-layer MXene precipitation;

[0050] 2) Redisperse the multi-layer MXene precipitate into deionized water to form a 4mg / mL suspension, then dry 10g of ACF in an oven at 100°C for 8 hours and cut it into pieces of 1.5cm*1.5cm*0.1cm. The ACF is immersed in the suspension to form MXene / ACF through electrostatic self-assembly;

[0051] 3) Take out the obtained MXene / ACF at a wavelength of 250nm and an intensity of 40μW / cm 2 Vacuum drying ...

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Abstract

The invention discloses an MXene-ACF composite material for catalyzing an acetylene hydrochlorination reaction as well as a preparation method and application of the MXene-ACF composite material. The preparation method comprises the following steps: 1, adding LiF powder into an HCl solution, sufficiently dissolving, slowly adding MAX powder, stirring and etching in an ultrasonic-assisted oil bath, and centrifugally washing with deionized water to obtain a plurality of layers of MXene precipitates; 2, re-dispersing the multi-layer MXene precipitate obtained in the step 1 into deionized water to form an MXene suspension, immersing the cut activated carbon fiber into the MXene suspension, and forming MXene / ACF through electrostatic self-assembly; and 3, taking out the MXene / ACF obtained in the step 2, and carrying out vacuum drying under ultraviolet irradiation to obtain the MXene / ACF composite material. The prepared MXene / ACF composite material is used for catalyzing acetylene hydrochlorination to synthesize vinyl chloride, the good catalytic performance is shown, the acetylene conversion rate and the vinyl chloride selectivity are high, and the stability is good.

Description

(1) Technical field [0001] The invention belongs to the field of catalyst technology, and in particular relates to an MXene-ACF composite material used for catalyzing acetylene hydrochlorination and its preparation method and application. (2) Background technology [0002] Polyvinyl chloride (PVC for short), as one of the top five engineering plastics in the world, is widely used in the chemical industry. Vinyl chloride (VCM for short) is a monomer for synthesizing PVC. At present, the annual demand for PVC is 400 million tons, which makes VCM a very important chemical raw material. About 90% of VCM is used to produce PVC. There are three main chemical synthesis processes of vinyl chloride, namely, C 2 h 2 Law, C 2 h 4 Law, C 2 h 6 Law. my country's "coal-rich, oil-poor, and gas-poor" resource structure determines that the calcium carbide acetylene method will be the main process for the production of vinyl chloride in my country for a long time in the future, that is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224B01J27/24B01J37/34C07C17/08C07C21/06
CPCB01J27/224B01J27/24B01J37/343B01J37/345C07C17/08C07C21/06
Inventor 赵佳王涛常仁芹岳玉学李小年
Owner ZHEJIANG UNIV OF TECH
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