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Nitrogen-doped carbon-wrapped tricobalt tetroxide nanowire monolithic catalyst and preparation method thereof

A technology of monolithic catalysts and cobalt tetroxide particles, which is applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the difficulty of dispersion and separation, reduce catalytic activity, transmit Uneven mass contact, etc., to achieve the effects of strong catalytic stability, easy access to raw materials, and high catalytic efficiency

Active Publication Date: 2022-04-19
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the catalysts of tricobalt tetroxide are mostly in the form of powder or nano-particle structure. When used directly as a catalyst, there are many problems such as difficulty in dispersion and separation, uneven mass transfer and contact during the catalytic reaction process; adding a binder to form a bulk material will increase the cost and reduce the catalytic activity.

Method used

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  • Nitrogen-doped carbon-wrapped tricobalt tetroxide nanowire monolithic catalyst and preparation method thereof
  • Nitrogen-doped carbon-wrapped tricobalt tetroxide nanowire monolithic catalyst and preparation method thereof
  • Nitrogen-doped carbon-wrapped tricobalt tetroxide nanowire monolithic catalyst and preparation method thereof

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preparation example Construction

[0052] The preparation method of described monolithic catalyst comprises the following steps:

[0053] S100, preparation of solution: Co(NO 3 ) 2 Mix with nitrogen and carbon compounds in a certain proportion and add water to form a solution; wherein, the Co(NO 3 ) 2 The molar ratio to nitrogen and carbon compounds is 1:1.5 to 1:5. Preferably, as an implementation manner, the nitrogen- and carbon-containing compound is one or both of urea and tetrasodium edetate.

[0054] In the present application, there is no particular limitation on the concentration of the prepared solution. In order to prepare a monolithic nitrogen-doped carbon-wrapped cobalt tetraoxide nanowire catalyst with excellent performance, enhance its catalytic stability, and prolong its service life, preferably, Co(NO 3 ) 2 The molar ratio with water is 1:600~1:1200.

[0055]S200, hydrothermal reaction: put the solution obtained in step S100 in a reaction kettle, add metal foam, carbon foam or carbon fibe...

Embodiment 1

[0067] (1) Add 0.584g Co(NO 3 ) 2 ·6H 2 O, 0.6g urea, 36mL deionized water, stir well at room temperature. Among them, Co(NO 3 ) 2 The molar ratio to urea is 1:5, Co(NO 3 ) 2 The molar ratio with water is 1:1000.

[0068] (2) Transfer the solution prepared in step (1) to a 100mL reaction kettle, add foamed nickel carrier, make it immersed in the solution, put it in an oven and react at 120°C for 8h, take it out and wash it twice with water and ethanol in turn , placed in a beaker, and dried in an oven at 60° C. for 12 hours to obtain a precursor.

[0069] (3) Place the precursor obtained in step (2) in the quartz boat of the tube furnace, seal it and pass high-purity nitrogen gas as the whole process protective gas, wherein the flow rate of nitrogen gas is 150mL / min; The temperature was raised to 350°C at a speed of 1 min, and after holding for 0.5h, it was cooled to room temperature at a speed of 3°C / min. The obtained product was a monolithic nitrogen-doped carbon-wra...

Embodiment 2

[0071] (1) Add 0.584g Co(NO 3 ) 2 ·6H 2 O, 0.2g urea, 36mL deionized water, stir well at room temperature. Among them, Co(NO 3 ) 2 The molar ratio to urea is 1:1.67, Co(NO 3 ) 2 The molar ratio with water is 1:1000.

[0072] (2) with embodiment 1

[0073] (3) Same as Example 1, the obtained sample is designated as sample 2.

[0074] Compared with Example 1, the quality of urea in the raw materials used in this example has changed, and the rest of the preparation conditions have not changed. As the quality of urea decreases, the nitrogen-doped carbon coating of the catalyst finally obtained becomes thinner, The amount of nitrogen doping is reduced.

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Abstract

The present application discloses a monolithic catalyst. The monolithic catalyst includes a carrier and an active material loaded on the carrier; the active material includes nitrogen-doped carbon nanowires wrapping tricobalt tetroxide particles. The application also discloses a preparation method of the monolithic catalyst. The cobalt trioxide nanowires in the monolithic catalyst are wrapped by a nitrogen-doped carbon layer, and the product has good quality, high conductivity and long service life.

Description

technical field [0001] The application relates to an integral catalyst and a preparation method of an integral nitrogen-doped carbon-wrapped cobalt tetraoxide nanowire catalyst, which belongs to the field of material preparation. Background technique [0002] Cobalt is a common transition metal. Compared with precious metals such as gold, platinum, ruthenium and iridium, cobalt is more abundant in reserves, cheaper in price, and has certain catalytic properties, so it has become a popular material in the field of catalysis. However, the catalytic efficiency of pure metallic cobalt is low, and its catalytic performance is in the lower reaches of known materials, while its highly oxidized cobalt tetroxide shows excellent catalytic activity in many catalytic reactions. Studies have shown that the catalytic efficiency of cobalt tetroxide can be further improved and its stability in catalytic reactions can be enhanced by adjusting the surface defects, charge distribution and micr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J23/75
CPCB01J27/24B01J23/75B01J35/0086
Inventor 谌春林周振强张建
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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