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Cobaltosic oxide catalyst, preparation method and application thereof

A technology of cobalt tetroxide catalyst and cobalt tetroxide, which is applied in catalyst activation/preparation, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as high cost and easy deactivation, and achieve simple raw materials. , The effect of lowering the active energy barrier and easy control of reaction conditions

Pending Publication Date: 2020-02-14
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of high cost and easy deactivation have become its limiting factors, and it is necessary to continue to explore low-cost but highly efficient catalysts for noble metals.

Method used

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  • Cobaltosic oxide catalyst, preparation method and application thereof
  • Cobaltosic oxide catalyst, preparation method and application thereof
  • Cobaltosic oxide catalyst, preparation method and application thereof

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preparation example Construction

[0034] The preparation method of tricobalt tetroxide catalyst of the present invention comprises:

[0035] (a) Preparation of cobalt tetraoxide nanorods Co with exposed crystal plane (110) 3 o 4 -110;

[0036] (b) Doping N atoms into cobalt tetraoxide nanorods Co 3 o 4 -110 surface, get tricobalt tetroxide catalyst N-Co 3 o 4 -110.

[0037] Specifically, step (a) includes:

[0038] (1) Mix ammonia water and polyol solution evenly, then add Na 2 CO 3 The solution is mixed evenly to obtain a mixed solution;

[0039] (2) Add Co(NO 3 ) 2 ·6H 2 The O solution is mixed evenly to obtain a sol; the mixed solution contains ammonia and Na 2 CO 3 Two alkaline solutions can be mixed with Co(NO 3 ) 2 ·6H 2 O reaction to synthesize Co(CO 3 ) 0.5 (OH) · 0.11 , which is calcined to eventually form Co 3 o 4 .

[0040] (3) Put the sol in a hydrothermal autoclave, and place the hydrothermal autoclave in a drying oven to heat up;

[0041] (4) washing and drying the product...

Embodiment 1

[0053] (a) Preparation of cobalt tetraoxide nanorods Co with exposed crystal plane (110) 3 o 4 -110

[0054] (1) Mix 10 mL ammonia water and 25 mL ethylene glycol solution evenly, then slowly add 1.5 mL, 1 mol L -1 Na 2 CO 3 The solution is mixed evenly to obtain a mixed solution;

[0055] (2) Add 5mL, 1 molL to the mixed solution -1 Co(NO 3 ) 2 ·6H 2 O solution, stirred continuously for 20 min to mix evenly to obtain a sol;

[0056] (3) Put the sol in a 100 mL hydrothermal autoclave, and gradually heat the hydrothermal autoclave to 170 o C and keep for 17h;

[0057] (4) Wash the product obtained in step (3) with deionized water at 60 o Dry at C for 12h;

[0058] (5) Place the product obtained in step (4) in a muffle furnace for 300 o Calcined at C for 3h, the exposed crystal face of (110) cobalt tetraoxide nanorods Co 3 o 4 -110. After testing, it can be known that cobalt trioxide nanorods Co 3 o 4 The specific surface area of ​​-110 is 36.8m 2 g -1 , the ...

Embodiment 2

[0061] (b) Doping N atoms in Co 3 o 4 -110 surface, get tricobalt tetroxide catalyst N-Co 3 o 4 -110

[0062] Get the cobalt trioxide nanorod Co in 0.2g embodiment 1 3 o 4-110 placed in the plasma cleaner, turn on the vacuum pump to vacuum for 5min, turn on the nitrogen switch and adjust the flowmeter to 50mLmin -1 Feed nitrogen into the instrument, set the power to 30W, and process for 20 minutes to obtain the tricobalt tetroxide catalyst N-Co 3 o 4 -110. After testing, it can be seen that the tricobalt tetroxide catalyst N-Co 3 o 4 The specific surface area of ​​-110 is 52.3.8m 2 g -1 , the pore volume is 0.57ccg -1 .

[0063] image 3 For the prepared N-Co 3 o 4 SEM image of -110, image 3 N-Co is shown in 3 o 4 The nanorod morphology of -110 has a certain fracture, indicating that the N 2 The plasma has an etching effect on the cobalt tetroxide nanorods, so that it can expose a more active outer surface, so that the cobalt tetroxide catalyst produces mo...

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Abstract

The invention discloses a cobaltosic oxide catalyst, a preparation method and application thereof. The preparation method includes: (a) preparing a cobaltosic oxide nanorod Co3O4-110 with an exposed crystal surface (110); and (b) doping N atom to the surface of Co3O4-110 to obtain the cobaltosic oxide catalyst N-Co3O4-110. The preparation method of the cobaltosic oxide catalyst provided by the invention has easily controllable reaction conditions, can be operated at room temperature, and by changing the nitrogen plasma treatment time, different nitrogen doping amounts and oxygen vacancy content can be obtained. The cobaltosic oxide catalyst obtained by the preparation method disclosed by the invention has the advantages of simple and easily available raw materials, and lower cost than platinum, palladium and the like, and simple operation method, and is suitable for industrial application. The cobaltosic oxide catalyst has more surface defects, higher surface oxygen content and highercharge transfer efficiency, and can be used for catalyzing various oxidation reactions.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a tricobalt tetroxide catalyst as well as its preparation method and application. Background technique [0002] Natural gas has now become an important diversified energy supply to alleviate the excessive dependence on oil and coal. Especially with the rise of the "shale gas revolution", the global energy mix has witnessed a growing share of earth-abundant natural gas. However, the introduction of natural gas has also raised concerns that methane (CH 4 ), as its main component, is a greenhouse gas whose greenhouse gas effect is about 25 times that of carbon dioxide (Adv. Funct. Mater. 2019, 29 (8), 1807519). Therefore, reprocessing of unconverted methane originating from power plants, compressed natural gas vehicles (CNGVs), chemical industry, etc. has also attracted extensive attention (Appl. Catal. B: Environ. 2018, 237, 844-854). Considering CH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/75B01J37/34F23G7/07
CPCB01J27/24B01J23/75B01J37/349F23G7/07B01J35/23
Inventor 李星运于强赵修松
Owner QINGDAO UNIV
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