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Photocatalytic halohydrocarbon dehalogenation conversion method

A halogenated hydrocarbon and photocatalytic technology, which is applied in the field of catalytic synthesis and the sustainable development of the environment and energy, can solve the problems of precious metals and narrow use range of substrates, and achieve the effect of avoiding by-products

Inactive Publication Date: 2019-03-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these systems have many disadvantages, such as the use of precious metals, narrow use of substrates, etc.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0056] Using CdSe QDs as the photocatalyst, add the photocatalyst to 4mL of water, and the solubility of the catalyst is 2×10 -5 M, add 50μL of dichloromethane (66.3mg, 0.78mmol) and 300μL of triethylamine (218.1mg, 2.16mmol), replace the air with Ar atmosphere, 1mL N 2 As an internal standard, at room temperature, LED lights (λ> 460nm) irradiation for 4h. After the reaction, use GC (TCD) to detect CH 4 Yield. The methane yield is 80%.

Embodiment 2

[0058] Using CdSe QDs as the photocatalyst, adding the photocatalyst to 4mL of water, the solubility of the catalyst is 2×10 -5 M, add 55μL of dibromomethane (135.6mg, 0.78mmol) and 300μL of triethylamine (218.1mg, 2.16mmol), replace the air with Ar atmosphere, 1mL N 2 As an internal standard, at room temperature, LED lights (λ> 460nm) irradiation for 8h. After the reaction, use FID-GC to detect CH 4 And ethylene selectivity and yield. The selectivity for methane is 22%, and the selectivity for ethylene and ethane is as high as 77%.

Embodiment 3

[0060] Using CdSe QDs as the photocatalyst, adding the photocatalyst to 4mL of water, the solubility of the catalyst is 2×10 -5 M, add 63μL of diiodomethane (208.9mg, 0.78mmol) and 300μL of triethylamine (218.1mg, 2.16mmol), replace the air with Ar atmosphere, 1mL N 2 As an internal standard, at room temperature, LED lights (λ> 460nm) irradiation for 8h. After the reaction, use FID-GC to detect CH 4 And ethylene selectivity and yield. The selectivity of ethylene and ethane is as high as 95%.

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Abstract

The invention provides a photocatalytic halohydrocarbon dehalogenation conversion method which comprises the following steps: adding a photocatalyst quantum dot / rod into a solvent to obtain a solutionA; adding halohydrocarbon and an electronic sacrificial body into the solution A to obtain a solution B; utilizing a light source to irradiate the solution B and catalyzing the solution B to performhalohydrocarbon dehalogenation conversion. According to the photocatalytic halohydrocarbon dehalogenation conversion method disclosed by the invention, a nano quantum dot and a nano quantum rod are applied to dehalogenation conversion reaction of alkyl halide, alkenyl halide and alkyne halide for the first time; the reaction conditions are moderate, visible light is utilized as driving energy, a product is hydrocarbon compound, and the whole process has the advantages of environmental protection, conciseness and high efficiency. In addition, higher hydrocarbon of carbon chain growth can be generated after dehalogenation reaction, so that the method has potential application in preparation of higher hydrocarbon. According to the method disclosed by the invention, halohydrocarbon dehalogenation conversion and deuteration marking processes are jointly performed; hydrocarbon deuteration marking can be finished when a halohydrocarbon dehalogenation process is finished. The invention furtherprovides a method for performing deuteration marking on hydrocarbon.

Description

Technical field [0001] The invention belongs to the technical field of catalytic synthesis and sustainable development of environment and energy, and relates to a method for photocatalytic halogenated hydrocarbon dehalogenation conversion. Background technique [0002] Halogenated hydrocarbons, such as dichloromethane, trichloroethylene, dibromomethane, etc., are widely used in the production of pesticides, medicines, polymers, dyes and pigments in industry. A large amount of discharge into the environment will cause continuous harm to the ecological environment and human safety. An effective way to deal with halogenated hydrocarbons is hydrogenation reduction. From a thermodynamic point of view, the reduction of halogenated hydrocarbons by hydrogenation is an endothermic process that requires more energy. At present, the commonly used method is to use precious metals as catalysts to realize the dehalogenation and hydrogenation conversion of halogenated hydrocarbons under high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/26C07C9/04C07C9/06C07C9/08C07C9/15C07C11/04C07B59/00B01J27/057B01J27/04B01J27/135
CPCC07B59/001C07C1/26B01J27/04B01J27/0573B01J27/135C07B2200/05B01J35/39C07C9/04C07C9/06C07C9/08C07C9/15C07C11/04Y02P20/52
Inventor 吴骊珠黄茂勇李旭兵周帅张丽萍佟振合
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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