Supported cobaltosic oxide catalyst and preparation method and application thereof

A technology of tricobalt tetroxide catalyst and tricobalt tetroxide, which is applied in the direction of catalyst activation/preparation, cobalt oxide/cobalt hydroxide, metal/metal oxide/metal hydroxide catalyst, etc., which can solve the problems of catalysts without good stability, precious metal loss, temperature Unable to meet the exhaust gas of natural gas engine and other issues

Active Publication Date: 2016-07-20
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 natural gas engine.
[0003] Noble metal-supported catalysts show good activity for the low-temperature combustion reaction of methane, but this type of catalyst does not have good stability at high temperatures, and noble metals are prone to loss and sintering at higher temperatures, resulting in a decrease in catalyst activity
Supporting noble metals by traditional impregnation methods cannot solve these problems well, because this method generally lacks the interaction between noble metals and supports.

Method used

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  • Supported cobaltosic oxide catalyst and preparation method and application thereof
  • Supported cobaltosic oxide catalyst and preparation method and application thereof
  • Supported cobaltosic oxide catalyst and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] 3%Pd-Co 3 o 4 Nanorods (3% refers to the quality of noble metal elements and noble metal elements and Co 3 o 4 The ratio of the total mass, the following examples are defined the same): 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 0.0628gPd(NO 3 ) 2 solution, and continuously feed N into it 2 Ageing. After reacting for one hour, it was transferred to a high-pressure reactor, heated in water at 160°C for 3h, cooled to room temperature, centrifuged and washed with deionized water, and then vacuum-dried at 60°C for 12h to obtain a catalyst precursor. TEM image See Figure 1a , and then fired at 300°C for 4h. 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 wit...

Embodiment 2

[0046] 1%Pd-Co 3 o 4 Nanorods: Dissolve 10mmol cobalt nitrate in 25mL ethylene glycol, gradually heat to 80°C, then add 0.1mol / L NaHCO dissolved in 100mL deionized water 3 aqueous solution. After stirring vigorously for 10 min, 15 mL of 0.021 g Pd(NO 3 ) 2 solution, and continuously feed N into it 2 Ageing. After reacting for 1h, transfer it to a high-pressure reactor, heat it in water at 160°C for 3h, cool to room temperature, centrifuge and wash with deionized water, dry it in vacuum at 60°C for 12h, and then bake it at 400°C for 4h. 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 catalytic reaction is 150-450°C, the pressure is normal pressure; the total flow rate of the reaction is 50mL / min, and the flow rate of these three gases is higher than that of CH 4 :O 2 :N 2 =1...

Embodiment 3

[0048] 5%Pd-Co 3 o 4 Nanorods: Dissolve 5mmol cobalt chloride in 20mL ethylene glycol, gradually heat to 70°C, then add 0.3mol / LNH dissolved in 50mL deionized water 4 HCO 3 aqueous solution. After stirring vigorously for 10 min, add 10 mL of 0.105 g Pd(NO 3 ) 2 solution, and continuously feed N into it 2 Ageing. After reacting for 1h, transfer it to a high-pressure reactor, heat it in water at 160°C for 2h, cool to room temperature, centrifuge and wash with deionized water, dry it in vacuum at 50°C for 10h, and finally bake it at 300°C for 3h. 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 catalytic reaction is 150-450°C, the pressure is normal pressure; the total flow rate of the reaction is 100mL / min, and the flow rate of these three gases is higher than that of CH 4 :O 2 :N 2 =...

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Abstract

The invention discloses a supported cobaltosic oxide catalyst and a preparation method and application thereof. The supported cobaltosic oxide catalyst comprises precious metal, precious metal oxide and cobaltosic oxide, the ratio of the mass of the precious metal to the total mass of the precious metal and Co3O4 is 1-10:100, and the supported cobaltosic oxide catalyst is of a one-dimensional structure. The preparation method includes: subjecting cobalt salt and precipitator water solution to coprecipitation in a dihydric alcohol system, adding precious metal salt solution, performing hydrothermal treatment, drying and roasting to obtain the supported cobaltosic oxide catalyst, and preparing the supported cobaltosic oxide catalyst by combining a coprecipitation method and a hydrothermal synthesis method. The preparation method is simple and easy to operate, the prepared catalyst is uniform in morphology and good in stability, methane conversion rate is up to 100% when CH4 is at the reaction temperature below 400 DEG C by applying the catalyst catalytic combustion reaction of the methane, and good low-temperature oxidative activity of the methane is realized.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a supported tricobalt tetroxide catalyst and a preparation method and application thereof. 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), and this temperature cannot meet the required temperature of the exhaust gas of a natural gas engine. [0003] Noble metal-sup...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/02F23C13/08
CPCB01J23/002B01J23/8913B01J35/023F23C13/08B01J2523/00B01J2523/845B01J2523/824B01J2523/19B01J2523/828B01J2523/18B01J37/031B01J37/035B01J37/08B01J37/10B01J37/14B01J35/0013B01J35/026B01J35/06B01J37/0009C01G51/04C01P2004/10B01D53/8621B01D2255/10B01D2255/20746B01D2255/9202C01P2002/72C01P2004/04C01P2004/16
Inventor 孙予罕祝艳杨娜婷孙永南
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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