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Graphene loaded cobalt catalyst, and preparation method and application thereof

A graphene and catalyst technology, applied in the field of graphene-supported cobalt-based catalysts and its preparation, can solve the problems of increasing the selectivity of by-products and failing to meet industrial applications, and achieve the effect of inhibiting the generation of CH4 and improving selectivity

Active Publication Date: 2018-01-19
SINOPEC ENG GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the application of this supported cobalt-based catalyst in the Fischer-Tropsch synthesis of olefins increases the selectivity of low-carbon olefins and increases the by-product CH 4 selectivity, unable to meet the requirements of industrial applications

Method used

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  • Graphene loaded cobalt catalyst, and preparation method and application thereof
  • Graphene loaded cobalt catalyst, and preparation method and application thereof
  • Graphene loaded cobalt catalyst, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This embodiment provides a method for preparing a graphene-supported Co nanoparticle catalyst, and the specific preparation steps are as follows:

[0043] Add 1 g of GO into 20 mL of deionized water and ultrasonically disperse for 40 min to prepare a 0.05 g / mL GO suspension. Graphene oxide suspension according to mass ratio: cobalt ion: reducing agent: dispersant is 0.25:1:10:50, gets the GO suspension of above-mentioned 20mL in beaker, adds 43g Co(NO 3 ) 2 ·6H 2 O, 40g ascorbic acid and 200g PVP were stirred for 60min, ultrasonicated for 10min (ultrasonic power: 250W, ultrasonic frequency: 40KHz), and mixed evenly. The mixed solution was transferred to a 50 mL autoclave, and reacted in an oven at 180° C. for 9 h. Then cool down to room temperature, collect samples by centrifugation at 9900 rpm, and then wash with ethanol solution several times to remove surface organic matter. Dry the product overnight at 60°C without adding additives. The dried sample was taken a...

Embodiment 2

[0045] This embodiment provides a method for preparing a graphene-supported Co nanoparticle catalyst, and the specific preparation steps are as follows:

[0046] Add 1 g of GO into 20 mL of deionized water and ultrasonically disperse for 40 min to prepare a 0.05 g / mL GO suspension. Graphene oxide suspension according to mass ratio: cobalt ion: reducing agent: dispersant is 0.5:1:10:100, gets the GO suspension of above-mentioned 20mL in beaker, adds 21.5g Co(NO 3 ) 2 ·6H 2 O, 20g ascorbic acid (reducing agent) and 200g PVP (dispersant) were stirred for 60 minutes, ultrasonicated for 10 minutes (power: 250W, frequency: 40KHz), and mixed evenly. The mixed solution was transferred to a 50 mL autoclave, and reacted in an oven at 200° C. for 12 h. Then cool down to room temperature, collect samples by centrifugation at 9900 rpm, and then wash with ethanol solution several times to remove surface organic matter. Then re-disperse the product ultrasonically in the aqueous solution,...

Embodiment 3

[0048] This embodiment provides a method for preparing a graphene-supported Co nanoparticle catalyst, and the specific preparation steps are as follows:

[0049] Add 1 g of GO into 20 mL of DMF for ultrasonic dispersion for 40 min to prepare a 0.05 g / mL GO suspension. Graphene oxide suspension according to mass ratio: cobalt ion: reducing agent: dispersant is 0.5:1:10:75, gets the GO suspension of above-mentioned 20mL in beaker, adds 21.5g Co(NO 3 ) 2 ·6H 2 O, 20g sodium borohydride (reducing agent) and 150g CTAB (dispersant) were stirred for 60 minutes, ultrasonicated for 10 minutes (power: 250W, frequency: 40KHz), and mixed evenly. The mixed solution was transferred to a 50 mL autoclave, and reacted in an oven at 200° C. for 12 h. Then cool down to room temperature, collect samples by centrifugation at 9900 rpm, and then wash with ethanol solution several times to remove surface organic matter. Then re-disperse the product ultrasonically in the aqueous solution, accordin...

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Abstract

The invention provides a graphene loaded cobalt catalyst, and a preparation method and application thereof, and belongs to the technical field of chemical industry. The graphene loaded cobalt catalystis obtained by performing reaction on graphene oxide and a cobalt source in a solution system under the existence of a reducing agent, centrifugally washing, dispersing into the solution, drying androasting under inert gas atmosphere. In the catalyst, cobalt-based nanoparticles are directly loaded on the graphene through an in-situ growth method, the binding force of the cobalt-based nanoparticles and the graphene carrier is maximized, high-temperature roasting is conducted, a CoC2 structure is formed at the binding position of the particles and the carrier, the selectivity of low-carbon olefin is improved, generation of CH4 is inhibited, and high selectivity on preparation of olefin prepared through Fischer-Tropsch synthesis is achieved.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a graphene-supported cobalt-based catalyst and its preparation method and application. Background technique [0002] As basic organic chemical raw materials, light olefins play a pivotal role in modern petroleum and chemical industries. Especially ethylene and propylene can be said to be the source of the downstream chemical industry without exaggeration. The output of low-carbon olefins not only marks the development level of a country's petrochemical industry, but also an important symbol to measure a country's comprehensive national strength. [0003] At present, the main method of domestic production of low-carbon olefins is still naphtha cracking, accounting for about 94% of the market (100% ten years ago). In order to solve the problem of single technology and high cost of producing low-carbon olefins in China, combined with the characteristics of my country'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J27/22C07C1/04C07C11/04C07C11/06C10G2/00
CPCY02P20/52
Inventor 秦毓辰毛继平张国良陈新宇何文江莉杨莹刘九林潘延
Owner SINOPEC ENG GRP CO LTD