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A kind of cobalt tetroxide catalyst for catalytic combustion of methane and its preparation and application

A cobalt tetroxide catalyst, methane catalytic combustion technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as high temperature and long reaction time, and achieve The effect of simple raw materials, easy access to raw materials, and simple operation of the method

Active Publication Date: 2020-09-29
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, surface oxygen species are adsorbed at the defects (lattice, edge, surface defects, etc.) of the material, so the defects have a great influence on the properties of oxide materials (Applied Catalysis B: Environmental 223(2018) 91–102.) , but it is still challenging to generate defects in oxides at room temperature
The generation of defects in oxides is controlled by traditional chemical reduction methods, which usually require high temperatures and long reaction times

Method used

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  • A kind of cobalt tetroxide catalyst for catalytic combustion of methane and its preparation and application
  • A kind of cobalt tetroxide catalyst for catalytic combustion of methane and its preparation and application
  • A kind of cobalt tetroxide catalyst for catalytic combustion of methane and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 4

[0024] Example 1 Cobalt Tetroxide Nanosheets Co 3 o 4 - Preparation of NSs

[0025] Mix 4.2g cobalt acetate tetrahydrate and 40mL ethylene glycol solution uniformly to prepare solution A; add 8g sodium hydroxide to 40mL ethylene glycol solution and mix uniformly to prepare solution B. Wherein, the ethylene glycol solution is obtained by uniformly mixing ethylene glycol and deionized water at a volume ratio of 1:1. Solution A and solution B were mixed after magnetic stirring for 3 hours to form a sol; the obtained sol was transferred to a hydrothermal autoclave (100 mL), and gradually heated to 150 ° C in a blast drying oven and kept for 20 hours; the obtained product was then deionized with After washing with water, dry at 70°C for 12h; place the dried sample in a muffle furnace and calcinate at 300°C for 4h, and the obtained material is named Co 3 o 4 -NSs.

[0026] figure 1 For the Co prepared in Example 1 3 o 4 -SEM images of NSs, figure 1 Shown in Co 3 o 4 -Nano...

Embodiment 2

[0027] Embodiment 2 is used for the tricobalt tetroxide catalyst Co of methane catalytic combustion 3 o 4 -Preparation of Na

[0028] In a glove box filled with Ar, the Co prepared in Example 1 3 o 4 -NSs and elemental sodium were manually ground in an agate mortar for 1 h at a grinding rate of 2 rpm; the mass of elemental sodium was Co 3 o 4 -0.5% of the mass of NSs, put the ground sample in a beaker, add 100mL of deionized water and a rotor, and stir for 1h. Use a vacuum pump filter device, wash with deionized water to PH = 7, and dry the obtained sample at 70 °C for 12 hours in a blast drying oven. The obtained material is named Co 3 o 4 -Na.

[0029] figure 2 For the Co prepared in Example 1 3 o 4 -NSs and the Co prepared in Example 2 3 o 4 -XRD spectrum of Na, from figure 2 It can be seen that the morphology of cobalt tetraoxide nanosheets before and after treatment has not changed in crystal phase.

[0030] image 3 For the Co prepared in Example 1 3 o 4...

Embodiment 3

[0034] Embodiment 3 is used for the tricobalt tetroxide catalyst Co of methane catalytic combustion 3 o 4 Catalytic Combustion Reaction of -Na to Methane

[0035] Adopt each 0.1g of the catalyst in embodiment 1-2 respectively, pack in the fixed-bed reactor, mass air velocity 21000mL / g / h, carry out the measurement of methane conversion rate, the change of the methane concentration in the tail gas is measured by gas chromatography, reflects the gas The composition is: 2% methane, 20% oxygen, and nitrogen as the balance gas. The conversion effect of the catalyst on methane was measured at 100-850°C, and the test results are shown in Figure 5 , at a space velocity of 21000mL / g / h, the performance of the material after sodium treatment was significantly improved compared with that before treatment.

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Abstract

The invention discloses a Co3O4 catalyst for methane catalytic combustion as well as preparation and application. A preparation method is characterized by taking cobalt acetate as a precursor, carrying out hydrothermal reaction under an alkaline environment, and then carrying out high-temperature roasting, thus obtaining a Co3O4 nanosheet; treating the Co3O4 nanosheet through sodium metal, thus obtaining the Co3O4 nanosheet for the methane catalytic combustion. The Co3O4 nanosheet for the methane catalytic combustion has more surface defect positions and reactive oxygen species, excellent methane catalytic combustion performance is shown, and larger potential in aspect of replacement of a noble metal catalyst is obtained.

Description

technical field [0001] The invention relates to the technical field of nanomaterial preparation, in particular to a cobalt trioxide catalyst used for catalytic combustion of methane and its preparation and application. Background technique [0002] In recent decades, due to the over-exploitation of coal and oil, people have been developing and utilizing natural gas more and more. Methane (CH 4 ), as the main component of natural gas, is one of the greenhouse gases, and its greenhouse gas effect is about CO 2 20 times (Applied Catalysis B: Environmental 230 (2018) 237–245). Natural gas emitted by cars, power plants, etc. poses a huge threat to the environment. Therefore, how to effectively deal with methane is an urgent problem to be solved. [0003] The reaction temperature of the traditional combustion method is too high (1600°C), which will cause the nitrogen and oxygen in the air to react to form NO x pollutants. Compared with direct combustion, the catalytic combus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75
Inventor 李星运于强王超赵修松
Owner QINGDAO UNIV
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