G-C3N4 supported cobalt oxide catalyst and preparation method thereof

A g-c3n4, cobalt oxide technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, separation methods, etc., to achieve excellent catalytic low-temperature oxidation activity of carbon monoxide, high stability, and excellent electron transport performance.

Active Publication Date: 2016-01-13
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, g-C 3 N 4 There are few reports on the catalytic low-temperature oxidation of carbon monoxide

Method used

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  • G-C3N4 supported cobalt oxide catalyst and preparation method thereof
  • G-C3N4 supported cobalt oxide catalyst and preparation method thereof
  • G-C3N4 supported cobalt oxide catalyst and preparation method thereof

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preparation example Construction

[0022] a g-C 3 N 4 The preparation method of supported cobalt oxide catalyst comprises the following steps:

[0023] Step 1. At room temperature, take cobalt acetate and distilled water according to the mass ratio of 1:15-16; add the taken cobalt acetate into the distilled water, and magnetically stir it to completely dissolve it to obtain an aqueous solution of cobalt acetate, which is set aside;

[0024] Step 2, follow g-C 3 N 4 The mass ratio of the powder to the cobalt oxide taken in the above step 1 is the ratio of 1:4-2:3, taking g-C 3 N 4 powder; take the g-C 3 N 4 Add the powder to distilled water twice the volume of the distilled water taken in the above step 1, and place it in an ultrasonic reactor with a power of 168W for 60-120 minutes to obtain g-C 3 N 4 aqueous solution, spare;

[0025] Step 3, the prepared cobalt acetate aqueous solution and g-C 3 N 4 The aqueous solution is mixed, stirred magnetically for 20-25 minutes to obtain a mixed solution A; t...

Embodiment 1

[0033] At room temperature, take 6.5 grams of cobalt acetate and dissolve it in 100 ml of distilled water, and stir it magnetically to dissolve it completely to obtain cobalt acetate aqueous solution I, which is set aside; 3 N 4 Take the corresponding amount of g-C in the ratio of 1:4 to the mass ratio of cobalt oxide 3 N 4 The powder was added to 200ml of distilled water and ultrasonicated for 60 minutes to obtain g-C 3 N 4 Aqueous solution II, spare; the g-C mentioned therein 3 N 4 Using melamine as the precursor, the temperature is raised to 520°C at a rate of 10°C / min, and the g-C is prepared in a block for 4 hours. 3 N 4 , after grinding, sieving, and set aside. Mix solution I and solution II, stir magnetically for 20 minutes, add 12 ml of ammonia water with a mass percentage of 28% dropwise, and stir magnetically for 120 minutes; put the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene , hydrothermal reaction at 150°C for 10 hours, a...

Embodiment 2

[0035] At room temperature, take 6.5 grams of cobalt acetate and dissolve it in 100 ml of distilled water, and stir it magnetically to dissolve it completely to obtain cobalt acetate aqueous solution I, which is set aside; 3 N 4 Take the corresponding amount of g-C in the ratio of 3:7 to the mass ratio of cobalt oxide 3 N 4 The powder was added to 200ml of distilled water and ultrasonicated for 80 minutes to obtain g-C 3 N 4 Aqueous solution II, spare; the g-C mentioned therein 3 N 4 Using melamine as the precursor, the temperature is raised to 520°C at a rate of 10°C / min, and the g-C is prepared in a block for 4 hours. 3 N 4 , after grinding, sieving, and set aside. Mix solution I and solution II, stir magnetically for 20 minutes, add 12 ml of ammonia water with a mass percentage of 28% dropwise, and stir magnetically for 120 minutes; put the mixed solution into a high-pressure reactor lined with polytetrafluoroethylene , hydrothermal reaction at 150°C for 10 hours, a...

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Abstract

The invention relates to a g-C3N4 supported cobalt oxide catalyst and a preparation method thereof. The preparation method comprises the following steps: preparing an aqueous solution of cobalt acetate and an aqueous solution of g-C3N4, mixing, and magnetically stirring to obtain a mixed solution A; adding ammonia water to the mixed solution A in a dropwise manner, and magnetically stirring to obtain a mixed solution B; adding the mixed solution B to an autoclave provided with a polytetrafluoroethylene liner, and carrying out a hydrothermal reaction at 130-160DEG C for 8-12h to obtain a mixture; and centrifuging the mixture, removing the obtained supernatant, washing the obtained residual solid substance, transferring the solid substance to an oven, and drying at 60DEG C for 8h to prepare the g-C3N4 supported cobalt oxide catalyst. The prepared catalyst can be used in catalysis of carbon monoxide low temperature oxidation, and can maintain complete conversion of carbon monoxide into carbon dioxide at 122DEG C for at least 2400min.

Description

technical field [0001] The present invention relates to a kind of catalyst, specifically a kind of g-C 3 N 4 Supported cobalt oxide catalyst and its preparation method. Background technique [0002] Carbon monoxide (CO) is a colorless, odorless, flammable, explosive and toxic gas. It is a major pollutant of the atmosphere and has a wide range of sources. If it is directly discharged into the air without effective treatment, it may bring serious hidden dangers to the atmospheric environment and human health. It is particularly important to control the emission of CO from the source, and the removal of CO by catalytic oxidation is the most effective way to control its emission. Although great achievements have been made in the research of CO on noble metal catalysts, the practical application of noble metal catalysts in the catalytic oxidation of CO is limited by the high price and limited resources. However, transition metals are cheap and also have good catalytic activit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01D53/86B01D53/62
CPCY02A50/20
Inventor 曹建亮王燕时建朝孙俊岭张火利李高杰张传祥刘宝忠孙广马名杰张战营
Owner HENAN POLYTECHNIC UNIV
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