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Graphene loaded cobaltous oxide catalyst and preparation method thereof

A cobalt oxide and graphene technology, applied in the field of graphene-supported cobalt oxide catalyst and preparation thereof, can solve problems such as easy deactivation, and achieve the effects of low cost, mild conditions and easy control, and simple operation.

Inactive Publication Date: 2016-01-27
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Many studies have shown that transition metal cobalt has similar or even higher catalytic performance for low-temperature oxidation of carbon monoxide than noble metals, but cobalt species with simple components are easily deactivated

Method used

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  • Graphene loaded cobaltous oxide catalyst and preparation method thereof
  • Graphene loaded cobaltous oxide catalyst and preparation method thereof
  • Graphene loaded cobaltous oxide catalyst and preparation method thereof

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preparation example Construction

[0022] A preparation method of graphene supported cobalt oxide catalyst, comprising the following steps:

[0023] Step 1. At room temperature, take cobalt acetate and distilled water according to the mass ratio of 1:20-21; add the taken cobalt acetate into the distilled water, and magnetically stir to make it completely dissolve, so as to prepare an aqueous solution of cobalt acetate, which is set aside;

[0024] Step 2, according to the mass fraction of 1.12% graphene oxide aqueous solution, the mass ratio of graphene and the cobalt oxide prepared in the above step 1 is a ratio of 1:4-2:3, and the mass fraction is 1.12% graphite oxide Aqueous solution of graphene oxide; the obtained graphene oxide aqueous solution is added to the distilled water of 3.7-4.6 volumes of distilled water obtained in the above step 1, and placed in an ultrasonic reactor with a power of 168W for 60-120 minutes to obtain diluted graphene oxide aqueous solution, spare;

[0025] Step 3. Mix the prepar...

Embodiment 1

[0030] At room temperature, 2.49 g of cobalt acetate was dissolved in 50 ml of distilled water, and magnetically stirred to completely dissolve it to obtain cobalt acetate aqueous solution I, which was set aside. Take graphene oxide aqueous solution according to the mass ratio of graphene and cobalt oxide in the catalyst being 1:4, add 230 milliliters of distilled water, ultrasonic 20 minutes, obtain graphene oxide aqueous solution II, set aside; Wherein, described graphene oxide Graphite oxide was prepared by an improved Hummers method, and then ultrasonically treated for 60 minutes to obtain an aqueous solution of graphene oxide with a mass percentage of 1.12%. Mix solution I and solution II, stir magnetically for 20 minutes, add 26 ml of ammonia water with a mass percentage of 28% dropwise, and stir magnetically for 120 minutes. Put the mixed solution into a polytetrafluoroethylene-lined autoclave, conduct a hydrothermal reaction at 180°C for 12 hours, and cool to room temp...

Embodiment 2

[0033]At room temperature, 2.49 g of cobalt acetate was dissolved in 50 ml of distilled water, and magnetically stirred to completely dissolve it to obtain cobalt acetate aqueous solution I, which was set aside. Take graphene oxide aqueous solution according to the mass ratio of graphene and cobalt oxide in the catalyst being 3:7, add 215 milliliters of distilled water, ultrasonic 20 minutes, obtain graphene oxide aqueous solution II, standby; Wherein, described graphene oxide Graphite oxide was prepared by an improved Hummers method, and then ultrasonically treated for 60 minutes to obtain an aqueous solution of graphene oxide with a mass percentage of 1.12%. Mix solution I and solution II, stir magnetically for 20 minutes, add 26 ml of ammonia water with a mass percentage of 28% dropwise, and stir magnetically for 120 minutes. Put the mixed solution into a polytetrafluoroethylene-lined autoclave, conduct a hydrothermal reaction at 180°C for 12 hours, and cool to room tempera...

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Abstract

The invention relates to a graphene loaded cobaltous oxide catalyst and a preparation method thereof. The preparation method comprises the steps that a cobaltous acetate aqueous solution and a graphene oxide aqueous solution are prepared firstly, after mixing is conducted, magnetic stirring is conducted, and a mixed solution A is obtained; ammonia water is dropwise added into the mixed solution A, magnetic stirring is conducted, and a mixed solution B is obtained; the mixed solution B is filled into a high-pressure reaction kettle with a polytetrafluoroethylene lining, a hydrothermal reaction is conducted for 10-14 h at 160-190 DEG C, and a mixture is obtained; after speed centrifugal separation is conducted on the obtained mixture, supernatant liquor is removed, residual solid matter is transferred to a drying oven after being washed, drying is conducted for 8 h at 60 DEG C, and the graphene loaded cobaltous oxide catalyst is prepared. The prepared catalyst can be applied to catalyzing of carbon monoxide low-temperature oxidation, the carbon monoxide can be completely oxidized into carbon dioxide at 100 DEG C, and the carbon monoxide can be completely converted into the carbon dioxide for at least 3000 min at 100 DEG C.

Description

technical field [0001] The invention relates to a catalyst, in particular to a graphene-supported cobalt oxide catalyst and a preparation method thereof. Background technique [0002] Carbon monoxide is a major pollutant in the atmosphere, mainly from automobile exhaust and industrial production processes. After inhalation, it can damage the central nervous system and cause great harm to human health. The catalytic oxidation removal of carbon monoxide is an effective way to control its emission. Among the catalysts that catalyze the oxidation of carbon monoxide, noble metals have high catalytic activity, but noble metals are expensive, less abundant in nature, and generally cannot avoid defects such as sulfur poisoning, which limits their wide application in industry. Therefore, it is very meaningful to develop catalysts that replace all or part of noble metals with non-noble metals. [0003] Graphene is a one-atom-thick two-dimensional crystal and is considered the basic...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/10
Inventor 曹建亮王燕陈泽华时建朝孙俊岭李高杰张传祥马名杰刘宝忠孙广张战营
Owner HENAN POLYTECHNIC UNIV
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