Catalyst for gas-phase catalytic synthesis of perfluoroiodocarbons and its preparation and application

A technology for perfluoroiodocarbon and compound, which is applied in the field of gas-phase catalytic synthesis of perfluoroiodocarbon compound catalyst and the field of preparation and application thereof, can solve the problems of theoretical upper limit of yield, high temperature, carbon deposition and the like, and is easy to achieve in preparation process conditions The effect of controlling, improving selectivity, and breaking the upper limit of existing technology

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gas-phase catalytic process still has disadvantages such as high temperature, serious carbon deposition, and theoretical upper limit of yield.

Method used

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  • Catalyst for gas-phase catalytic synthesis of perfluoroiodocarbons and its preparation and application
  • Catalyst for gas-phase catalytic synthesis of perfluoroiodocarbons and its preparation and application
  • Catalyst for gas-phase catalytic synthesis of perfluoroiodocarbons and its preparation and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1—— Embodiment 11

[0048] Weigh dicyandiamide or urea according to literature [Dong, F.; Wu, L.; Sun, Y.; Fu, M.; Wu, Z.; Lee, S.C., Efficient synthesis of polymeric g-C3N4layered materials as novel efficient visible C 3 N 4 , the C 3 N 4 Add it to 0.5M sulfuric acid solution, the ratio of feed to sulfuric acid solution is 1g:50mL, heat in a water bath at 80°C and stir to dissolve. Dry for 12h. Then weigh one lanthanide metal salt and one / two soluble alkali metal salts, and dissolve them to make an impregnating aqueous solution. After being fully dissolved, it is impregnated with the treated carrier in an equal volume, then left at this temperature for a certain period of time, then dried in vacuum (-0.08~-0.0MPa), and finally roasted in an inert atmosphere or a hydrogen atmosphere to obtain the obtained said catalyst. The mass ratio of each element in the catalyst was determined by ICP. The details are shown in Table 1.

Embodiment 12—— Embodiment 18

[0053] In a gas-solid reactor such as a fixed bed reactor or a fluidized bed, the perfluoroalkane compound or a mixture of several perfluoroalkane compounds and iodine vapor are simultaneously passed into the reactor according to the ratio of the amount of the substance at 1.0:1.0, and the whole The fluoroalkane compound and iodine vapor are irradiated by the photoreactor before entering the catalyst bed, and the time is not less than 5s. Set the light wavelength to 250-350nm, and the space velocity to not higher than 200-800h -1 , fully contact and react with the catalyst at 50-450°C and 1.0-1.5 atmospheric pressure. After the tail gas is absorbed by alkaline solution, dried and separated, the perfluoroiodocarbon compound is obtained. Products were analyzed by Agilent 7890A gas chromatograph. The details are shown in Table 2.

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Abstract

The invention discloses a gas-phase photothermal catalysis catalyst for synthesizing perfluoroiodomethane as well as its preparation and application. The catalyst is composed of a carrier and an active component. The carrier is one or a combination of tin oxide, titanium dioxide, zirconium dioxide or cadmium sulfide. The active component includes C coated on the surface of the carrier. 3 N 4 And the metal element loaded on the surface of the carrier, the metal element is composed of a lanthanide element and at least one alkali metal element, wherein the mass ratio of a lanthanide element and at least one alkali metal element is 1.0:( 0.1‑30), in the catalyst, based on the carrier quality, C 3 N 4 The loading is 0.5‑30%, and the lanthanide loading is 0.1‑8.0%. The invention provides the application of the catalyst in gas-phase photothermal catalytic synthesis of perfluoroiodocarbon compounds. The catalyst of the invention has good photocatalytic performance, can reduce the reaction temperature, improve the selectivity, and suppress the generation of carbon deposition to increase the service life of the catalyst.

Description

technical field [0001] The invention relates to a catalyst for gas-phase catalytic synthesis of perfluoroiodocarbon compounds, a preparation method and application thereof. Background technique [0002] CF 3 I is a high value-added haloalkane. In the field of fire extinguishing agent, it is one of the ideal substitutes for Halons fire extinguishing agent because of its good safety performance, high fire extinguishing efficiency and high economic effect; in the field of refrigerant, CF 3 I molecule does not contain ozone-depleting chlorine and bromine atoms, ODP is 0, GWP is also very low, non-flammable, oil-soluble and material compatibility is very good. Moreover, the energy of the C-I bond is low, and it is easy to decompose under heat or ultraviolet radiation, so it is one of the ideal substitutes for traditional Freon refrigerants; in the field of organic synthesis, CF 3 I contains CF3·, which is an important trifluorinated reagent and is widely used in the fields of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24C07C17/10C07C19/16
CPCB01J27/24B01J35/004C07C17/10C07C19/16
Inventor 卢春山张雪洁周烨彬王昊季豪克朱倩文张群峰丰枫马磊赵佳许孝良李小年
Owner ZHEJIANG UNIV OF TECH
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