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A kind of supported tricobalt tetroxide catalyst and its preparation method and application

A technology of cobalt tetroxide catalyst and cobalt tetroxide, which is used in catalyst activation/preparation, cobalt oxide/cobalt hydroxide, physical/chemical process catalyst, etc., can solve the problem of catalyst activity decline, temperature can not meet the exhaust gas of natural gas engine, lack of precious metals and carriers problems of interaction

Active Publication Date: 2018-09-25
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Summary
  • 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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  • A kind of supported tricobalt tetroxide catalyst and its preparation method and application
  • A kind of supported tricobalt tetroxide catalyst and its preparation method and application
  • A kind of supported tricobalt tetroxide catalyst and its preparation method and application

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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 in 100mL deionized water 2 CO 3 aqueous solution. After stirring vigorously for 10 min, 20 mL of 0.0628 g Pd(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 with a partic...

Embodiment 2

[0046] 1%Pd-Co 3 o 4 Nanorods: Weigh 10mmol cobalt nitrate and dissolve it 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 :...

Embodiment 3

[0048] 5%Pd-Co 3 o 4 Nanorods: Weigh 5mmol cobalt chloride and dissolve it in 20mL ethylene glycol, gradually heat to 70°C, then add 0.3mol / L NH2 dissolved in 50mL deionized water 4 HCO 3 aqueous solution. After stirring vigorously for 10 min, 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...

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Abstract

The invention discloses a supported tricobalt tetroxide catalyst and a preparation method and application thereof. The supported tricobalt tetroxide catalyst comprises the following components: noble metal, noble metal oxide and cobalt tetroxide, the ratio of the mass of the noble metal element to the total mass of the noble metal element and Co3O4 is 1-10:100, and the supported tricobalt tetroxide catalyst has a one-dimensional structure. The preparation method is as follows: in the glycol system, co-precipitation of cobalt salt and precipitant aqueous solution, then adding precious metal salt solution, hydrothermal, drying and roasting to obtain a supported tricobalt tetroxide catalyst, using co-precipitation method and hydrothermal synthesis method Combined preparation of supported tricobalt tetroxide catalyst. The preparation method is simple and easy to operate, the prepared catalyst has uniform morphology and good stability, and can be used in the catalytic combustion reaction of methane, so that when the reaction temperature of CH4 is below 400 oC, the methane conversion rate can be as high as 100%, and it has good low-temperature oxidation of methane. active.

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 Patents(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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