Preparation method and application of precious metal loaded type cobalt oxide nano catalyst

A nano-catalyst, cobalt tetroxide technology, applied in metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, cobalt oxide/cobalt hydroxide, etc., can solve the problem that the temperature cannot meet the exhaust gas of lean-burn engine. , the lack of precious metal and carrier interaction, the catalyst does not have good stability and other problems, to achieve good industrial application prospects, good high temperature structural stability, low cost effects

Inactive Publication Date: 2017-06-13
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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Problems solved by technology

At present, most of the methane combustion catalysts studied need to break the C-H bond at a higher temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine.
[0003] Noble metal-supported catalysts show good activity for the low-temperature combustion reaction of methane, but this type of catalyst d

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  • Preparation method and application of precious metal loaded type cobalt oxide nano catalyst
  • Preparation method and application of precious metal loaded type cobalt oxide nano catalyst
  • Preparation method and application of precious metal loaded type cobalt oxide nano catalyst

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preparation example Construction

[0044] Such as figure 1 Shown, the present invention provides a kind of preparation method of noble metal-loaded cobalt tetroxide nano-catalyst, comprises steps:

[0045] Such as figure 1 Shown, at first carry out step 1) S11, cobalt acetate tetrahydrate and ethylene glycol are mixed, and described ethylene glycol is used as surfactant and reducing agent in synthesis, is warming up to reaction temperature under stirring, then adds sodium carbonate After the aqueous solution is stirred, a noble metal salt solution is added, and N2 is continuously fed into it for aging to obtain noble metal-supported tricobalt tetroxide.

[0046] As an example, in step 1), the molar ratios of cobalt acetate tetrahydrate, ethylene glycol and sodium carbonate are 8-12 mmol: 25-35 mmol: 16-24 mmol.

[0047] As an example, in step 1), the reaction temperature is 60-100°C. Preferably, the reaction temperature is 80°C.

[0048] As an example, the noble metal salt includes one of noble metal nitrat...

Embodiment 1

[0070] Weigh 10mmol cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) Dissolve in 30ml ethylene glycol, gradually heat to 80°C, then add 0.2mol / L Na dissolved in 100ml deionized water 2 CO 3 aqueous solution. After stirring vigorously for 10min, add 20ml of 0.1610g Pd(NO 3 ) 2 solution, and continuously feed N into it 2 . After reacting for one hour, it was cooled to room temperature, centrifuged and washed with deionized water, and then vacuum-dried at 60° C. for 12 hours. The resulting product Pd / Co 3 o 4 powder (50mg) with Al 2 o 3 The powder (450mg) was added together into 15mL ethanol and stirred for 12h, centrifuged with ethanol, washed clean, and dried in vacuum at 120°C for 12h. Then bake at 500°C for 5h. Finally, the calcined body is ground into fine powder, extruded in a mold under a pressure of 40kN, crushed and sieved to obtain catalyst particles with a particle size of 40-60 mesh. The catalytic reaction conditions are: the temperature of the cataly...

Embodiment 2

[0073] Weigh 5mmol cobalt acetate tetrahydrate (Co(CH 3 COO) 2 4H 2 O) Dissolve in 15ml of ethylene glycol, gradually heat to 80°C, then add 0.2mol / L Na dissolved in 100ml of deionized water 2 CO 3 aqueous solution. After vigorous stirring for 10 min, 20 ml of 0.0525 g Pd(NO 3 ) 2 solution, and continuously feed N into it 2 . After reacting for one hour, it was cooled to room temperature, centrifuged and washed with deionized water, and then vacuum-dried at 60° C. for 12 hours. The resulting product Pd / Co 3 o 4 powder (50mg) with Al 2 o 3 The powder (450mg) was added together into 15mL ethanol and stirred for 12h, centrifuged with ethanol, washed clean, and dried in vacuum at 120°C for 12h. Then bake at 500°C for 5h. Finally, the calcined body is ground into fine powder, extruded in a mold under a pressure of 40kN, crushed and sieved to obtain catalyst particles with a particle size of 40-60 mesh. The catalytic reaction conditions are: the temperature of the cata...

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Abstract

The invention provides a multi-component precious metal loaded type nano catalyst in which cobalt oxide is loaded to an oxide carrier, a preparation method and application thereof. The preparation method is characterized in that a coprecipitation method is carried out; precious metal crystal seeds are loaded on an alkaline cobalt carbonate nanoparticle precursor in an ethylene glycol system; the reacted product is centrifugally dried to obtain precious metal loaded type cobalt oxide nanoparticles. According to the preparation method, the precious metal loaded cobalt oxide with a heterostructure is synthesized, so that the essence and composition of active sites of the precious metal loaded type cobalt oxide nano catalyst are influenced; the prepared materials are loaded on the oxide carrier through a liquid-phase mixing method, so that the dispersing degree of the precious metal loaded type cobalt oxide can be improved, and moreover, the problem of high cost caused by previous metal can be reduced. The preparation method of such material is simple and easy to operate, consistent in shape, high in stability, and low in cost, and shows high methane low-temperature oxidizing activity while being applied to methane combustion reaction, and has a certain industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a preparation method and application of a precious metal-loaded cobalt tetroxide nanometer catalyst. Background technique [0002] Due to the declining oil reserves in the world, more and more research focuses on the development of alternative energy sources, and the abundant natural gas energy has become the most promising energy source in the 21st century. However, as the main component of natural gas, methane is not only synthesized as a by-product in some industrial synthesis processes, but also is the main hydrocarbon air pollutant in natural gas fueled vehicles and natural gas power plants, and its greenhouse effect is CO 2 21 times. At present, most of the methane combustion catalysts studied need to break the C-H bond at a relatively high temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine. [0003] Noble metal-s...

Claims

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Application Information

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IPC IPC(8): B01J23/89C01G51/04C10L3/00
CPCB01J23/8913B01D53/72B01J37/031B01J37/035C01B2203/107B01J23/002C01G51/04C01P2002/72C01P2004/04C01P2004/64C10L3/003C10L2230/04
Inventor 祝艳刘敬伟孙予罕
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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