Polymer photocatalyst, and method of water-phase photo-catalytic selective alcohol oxidation

A photocatalyst and polymer technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, and the preparation of organic compounds, can solve the problems of poor selectivity and low conversion rate of oxidized alcohols, and achieve stable properties and high conversion rates , the effect of separating simple

Inactive Publication Date: 2013-06-05
FUZHOU UNIV
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  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a polymer photocatalyst and its water-phase photocatalytic selective oxidation of alcohol, for conventional TiO2 The sub>catalyst has a low conversion rate and poor selectivity in the oxidation of alcohols in the aqueous phase. A cheap and visible light-responsive polymer photocatalyst, carbon nitride, is selected. Its suitable energy band position enables it to significantly improve Selectivity, especially carbon nitride catalysts have the advantage of thermal stability in acidic and alkaline solutions, and the pH can be adjusted by acid and alkali to further improve the selectivity of certain types of alcohols. This is a general metal oxide, Incomparable to metal nitrides, metal sulfides, and metal oxynitrides

Method used

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  • Polymer photocatalyst, and method of water-phase photo-catalytic selective alcohol oxidation
  • Polymer photocatalyst, and method of water-phase photo-catalytic selective alcohol oxidation
  • Polymer photocatalyst, and method of water-phase photo-catalytic selective alcohol oxidation

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Effect test

Embodiment 1

[0024] First weigh 50 mg of metal oxide TiO 2 The catalyst is dispersed into the 4-methoxybenzyl alcohol-water reaction solution, wherein the volume content of alcohol in the alcohol-water reaction solution is 0.5%, the oxygen pressure is controlled to 0.8 MPa, the temperature of the catalyst bed is 60 °C, and the ultraviolet light source is turned on. The reaction time was 3 h, and the composition of the product was analyzed by HPLC liquid chromatography, and the results are shown in Table 1.

Embodiment 2

[0026] First, 50 mg of metal sulfide CdS catalyst was weighed and dispersed into the 4-methoxybenzyl alcohol-water reaction solution, wherein the volume content of alcohol in the alcohol-water reaction solution was 0.5%, and the oxygen pressure was controlled at 0.8 MPa. The temperature of the bed was 60°C, the visible light source was turned on, and the reaction time was 3 h. The composition of the product was analyzed by HPLC liquid chromatography. The results are shown in Table 1.

Embodiment 3

[0028] First weigh 50 mg TiO of metal oxynitrides 2-x N x The catalyst is dispersed into the 4-methoxybenzyl alcohol-water reaction solution, wherein the volume content of alcohol in the alcohol-water reaction solution is 0.5%, the oxygen pressure is controlled at 0.8 MPa, the temperature of the catalyst bed is 60°C, and the visible light source is turned on. The reaction time was 3 h, and the composition of the product was analyzed by HPLC liquid chromatography, and the results are shown in Table 1.

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Abstract

The invention discloses a polymer photocatalyst and a method of water-phase photo-catalytic selective alcohol oxidation. According to the invention, an organic polymer carbon nitride catalyst is prepared, and is applied in a water-phase photo-catalytic selective alcohol oxidation system. Compared with common ultraviolet catalyst TiO2, visible light catalyst TiO2-xNx, metal sulfide, metal nitride, metal nitrogen oxides, and the like, when alcohol is oxidized in water phase with a green oxidant air/oxygen under mild conditions, the carbon nitride catalyst is more stable and shows higher efficiency. The preparation method of the carbon nitride catalyst is simple and feasible, and the catalyst comprises no metal element, such that the catalyst is cheap. With the catalyst, alcohol oxidation aldehyde synthesis or ketone synthesis processes are simple and feasible, such that industrialized large-batch productions of aldehyde and ketone compounds can be facilitated.

Description

technical field [0001] The invention belongs to the field of organic photocatalytic synthesis, and in particular relates to a polymer photocatalyst and a method for selectively oxidizing alcohol by photocatalysis in water phase. Background technique [0002] The selective oxidation of alcohols to prepare corresponding aldehydes or ketones is a very important functional group conversion in organic synthesis, which is of great significance for both small-scale synthesis in the laboratory and large-scale industrial production. According to statistics, the annual production of carbonyl compounds in the world is 107 tons, and a considerable part of them comes directly through the oxidation of alcohols. For the oxidation of alcohol, the current production and research mainly include the following methods: [0003] Use stoichiometric oxidizing agents, which include: chromium (VI) reagents (chromium trioxide, dichromic acid, chromate, chromyl chloride, etc.), active MnO 2 , DMSO (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B21/082C07C45/38C07C47/575C07C47/54
Inventor 王心晨龙柏华
Owner FUZHOU UNIV
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