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A kind of carbon nitride catalyst modified by alkali metal ion and its preparation method and application

A technology of alkali metal ions and alkali metal halides, which is applied in the direction of physical/chemical process catalysts, separation methods, chemical instruments and methods, etc., can solve the problems of graphite phase carbon nitride crystallinity decrease, carbon nitride main structure damage, л Problems such as the decline of the conjugated system, to achieve the effect of mild and controllable conditions, cheap raw materials, and good stability

Active Publication Date: 2021-07-13
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Jiang Jing et al. published a comparative study of alkali metal-doped graphitic carbon nitride in visible light photocatalytic hydrogen production in the "Acta Catalytica Sinica". It uses alkali metal hydroxide to dope carbon nitride, but Due to the strong alkalinity of alkali metal hydroxide, the main structure of carbon nitride of graphite phase and alkali metal hydroxide is easily destroyed during high temperature treatment, resulting in a decrease in the crystallinity of graphite phase carbon nitride
Therefore, the л conjugated system decreases and the basicity is not high

Method used

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  • A kind of carbon nitride catalyst modified by alkali metal ion and its preparation method and application
  • A kind of carbon nitride catalyst modified by alkali metal ion and its preparation method and application
  • A kind of carbon nitride catalyst modified by alkali metal ion and its preparation method and application

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Embodiment 1

[0027] Firstly, 10 g of melamine was weighed and placed in an alumina crucible, and calcined at 550° C. for 4 hours in an air atmosphere. After natural cooling, the sample was taken out and ground into powder to obtain carbon nitride powder. Weigh 2g of carbon nitride powder and 10g of alkali metal chloride (potassium chloride), grind evenly, and calcinate at 600°C for 2 hours in a nitrogen atmosphere, and the solid obtained after natural cooling is ultrasonically dispersed in water to remove free carbon nitride on the surface. Potassium ions, dried after suction filtration to obtain potassium ion-modified carbon nitride.

Embodiment 2

[0029] Firstly, 10 g of melamine was weighed and placed in an alumina crucible, and calcined at 550° C. for 2 h in an air atmosphere. After natural cooling, the sample was taken out and ground into powder to obtain carbon nitride powder. Weigh 2g of carbon nitride powder and 10g of alkali metal chloride (sodium chloride) to grind evenly, calcinate at 600°C for 2 hours in a nitrogen atmosphere, and the solid obtained after natural cooling is ultrasonically dispersed in water to remove free carbon nitride on the surface. sodium ions, and dried after suction filtration to obtain sodium ion-modified carbon nitride.

Embodiment 3

[0031] Firstly, 10 g of melamine was weighed and placed in an alumina crucible, and calcined at 550° C. for 4 hours in an air atmosphere. After natural cooling, the sample was taken out and ground into powder to obtain carbon nitride powder. Weigh 2g of carbon nitride powder and 10g of alkali metal chloride (5g of sodium chloride and 5g of potassium chloride) and grind evenly, calcinate at 600°C for 2 hours in a nitrogen atmosphere, and the solid obtained after natural cooling is ultrasonically dispersed in water to remove Sodium and potassium ions are free on the surface of the carbon nitride, and dried after suction filtration to obtain carbon nitride decorated with sodium and potassium ions.

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Abstract

The invention belongs to the technical field of catalysts, and in particular relates to an alkali metal ion-modified carbon nitride catalyst, its preparation method and application. The catalyst is mainly based on carbon nitride, and the modified alkali metal ion includes Na + 、K + and Cs + One or more combinations thereof, wherein the content of alkali metal ions is 0.1-10% by weight; the alkali metal ions in the catalyst are adsorbed on the deprotonated amino nitrogen of carbon nitride through electrostatic interaction. The catalyst of the invention can be used as an organosulfur hydrolysis catalyst, and exhibits good catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to an alkali metal ion-modified carbon nitride catalyst, its preparation method and application. Background technique [0002] Carbonyl sulfide (COS), as the main form of organic sulfur, widely exists in fossil raw materials such as coal, natural gas and petroleum. Trace amounts of COS in industrial production can easily cause poisoning and deactivation of catalysts in the production process, corrosion of production equipment and instruments, and affect the quality of chemical products; in addition, untreated COS discharged into the atmosphere will react with oxygen to form SO 2 , promote photochemical reactions, bring serious pollution to the environment, and pose a threat to human health. The physical and chemical properties of carbonyl sulfide are stable, weakly acidic, and H 2 Compared with S, it is neither easy to dissociate nor liquefy, and is generally used to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01D53/86B01D53/48
CPCB01D53/8606B01D2257/308B01J27/24
Inventor 王心晨郭芳松侯乙东李姗蓉
Owner FUZHOU UNIV
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