Supported cobalt monatomic catalyst and preparation method and application thereof

A catalyst and supported technology, applied in the direction of catalyst activation/preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve the problems of restricting large-scale application, high cost and scarcity of precious metal catalysts, and achieve environmentally friendly selective oxidation , low cost, high selectivity

Pending Publication Date: 2021-11-12
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high cost and scarcity of noble metal catalysts limit their large-scale application

Method used

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  • Supported cobalt monatomic catalyst and preparation method and application thereof
  • Supported cobalt monatomic catalyst and preparation method and application thereof
  • Supported cobalt monatomic catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A preparation method of a supported cobalt single-atom catalyst, specifically comprising the steps of:

[0077] (1) Graphitized carbon nitride (g-C 3 N 4 ) preparation: put 10 g of urea in a crucible with a cover and transfer it to a muffle furnace, raise the temperature of the muffle furnace from room temperature to 600 °C at a rate of 5 °C / min, keep the temperature for 2 hours, and then cool it naturally. The powder was ultrasonically washed in deionized water, centrifuged, and vacuum-dried at 60°C, and the obtained solid powder was g-C 3 N 4 ;

[0078] (2) Composites of cobalt and graphitized carbon nitride (Co 1 / C 3 N 4 ) preparation: the g-C that 160mg step (1) obtains 3 N 4 Mix with 50mL deionized water, ultrasonically disperse evenly and transfer to 80°C oil bath; mix 3mg cobalt nitrate with 1.5mL deionized water to make a solution, and mix it with g-C 3 N 4 The aqueous dispersion was mixed, stirred and reacted in an oil bath at 80°C for 18h; after the...

Embodiment 2

[0085] A preparation method of a supported cobalt single-atom catalyst, specifically comprising the steps of:

[0086] (1) Graphitized carbon nitride (g-C 3 N 4 ) preparation: put 10 g of urea in a crucible with a cover and transfer it to a muffle furnace, raise the temperature of the muffle furnace from room temperature to 450 °C at a rate of 2 °C / min, keep the temperature for 4 hours, and then cool it naturally. The powder was ultrasonically washed in deionized water, centrifuged, and vacuum-dried at 80°C, and the obtained solid powder was g-C 3 N 4 ;

[0087] (2) Composites of cobalt and graphitized carbon nitride (Co 1 / C 3 N 4 ) preparation: the g-C that 50mg step (1) obtains 3 N 4 Mix with 100mL deionized water, ultrasonically disperse evenly and transfer to an oil bath at 100°C; mix 2.5mg cobalt acetate with 30mL deionized water to make a solution, and mix it with g-C 3 N 4 The water dispersion was mixed, stirred and reacted in an oil bath at 100 °C for 10 h; ...

Embodiment 3

[0090] A preparation method of a supported cobalt single-atom catalyst, specifically comprising the steps of:

[0091] (1) Graphitized carbon nitride (g-C 3 N 4 ) preparation: put 10g of urea in a crucible with a cover and transfer it to a muffle furnace, raise the temperature of the muffle furnace from room temperature to 650°C at a rate of 10°C / min, keep the temperature constant for 2.5h and then cool it naturally. The powder was ultrasonically washed in deionized water, centrifuged, and vacuum-dried at 50°C, and the obtained solid powder was g-C 3 N 4 ;

[0092] (2) Composites of cobalt and graphitized carbon nitride (Co 1 / C 3 N 4 ) preparation: the g-C that 500mg step (1) obtains 3 N 4 Mix with 100mL deionized water, ultrasonically disperse evenly and transfer to 60°C oil bath; mix 5mg cobalt chloride with 5mL deionized water to make a solution, and mix it with g-C 3 N 4 The aqueous dispersion was mixed, stirred and reacted in an oil bath at 60°C for 24h; after ...

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Abstract

The invention provides a supported cobalt monatomic catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) enabling urea to be subjected to a thermal polymerization reaction to obtain graphitized carbon nitride; (2) reacting the graphitized carbon nitride obtained in the step (1) with cobalt salt to obtain a cobalt and graphitized carbon nitride compound; and (3) carrying out heat treatment on the compound obtained in the step (2) and hypophosphite to obtain the supported cobalt monatomic catalyst. The preparation method is simple, wide in raw material source and high in yield, and has a large-scale application prospect. The supported cobalt monatomic catalyst is a phosphorus-doped graphitized carbon nitride supported cobalt monatomic catalyst, has the characteristics of adjustable band gap, high catalytic activity and high selectivity, and can realize selective oxidation under photocatalysis with high conversion rate; and the catalyst is especially suitable for converting alcohol compounds into aldehyde compounds or ketone compounds through a photo-oxidation catalytic reaction.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a supported cobalt single-atom catalyst and its preparation method and application. Background technique [0002] Aldehydes and ketones are important intermediates in the fine chemical and pharmaceutical industries. Among them, aromatic aldehydes, as important raw materials for the preparation of drugs and fine chemicals, are widely used in pesticides, spices, dyes and pharmaceutical industries. Benzaldehyde is a representative compound in the series of aromatic aldehydes. The development and optimization of its preparation process is a research hotspot in the field of chemical industry. In industry, toluene or benzene are usually used as starting materials, and react with oxidizing agents such as permanganic acid or dichromate to generate benzaldehyde under high temperature and high pressure conditions; but the oxidizing agents in the above-mentioned prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/00B01J37/02B01J37/08B01J37/28C07C45/38C07C47/54
CPCB01J27/24B01J37/28B01J37/082B01J37/0201B01J35/004B01J35/0046C07C45/38C07C47/54
Inventor 唐智勇高燕乐天邱雪英
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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