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Cobalt-based catalyst for reverse water-gas shift

A technology of cobalt-based catalyst and reverse water gas, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as poor thermal stability and methanation side reactions, and achieve good stability and inhibition Effect of methanation reaction and inhibition of methanation side reaction

Inactive Publication Date: 2017-01-04
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, in the prior art, the catalysts used for RWGS research are mainly copper-based, nickel-based and noble metal catalysts. Since the reaction is an endothermic reaction, high temperature is beneficial to improve the gentle conversion rate. Although copper-based catalysts have good selectivity, high temperature Poor thermal stability; noble metal, nickel, cobalt-based catalysts have good activity, but prone to methanation side reactions (CO 2 +4H 2 =CH 4 +2H 2 O, CO+3H 2 =CH 4 +H 2 O)

Method used

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  • Cobalt-based catalyst for reverse water-gas shift

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Taking the 5% Co / crab shell catalyst with a cobalt mass percentage of 5% as an example, it is prepared by an equal volume impregnation method, and the specific steps are as follows:

[0035] Clean the fresh Portunus trituberculatus shells, dry them at 100°C for 24 hours, place them in a muffle furnace and roast them at 600°C in an air atmosphere for 2 hours, cool them down to room temperature, and grind them to obtain the crab shell carrier. Weigh 0.2466g cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O was placed in a 50ml beaker, and 0.95ml deionized water was used to dissolve cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O gets Co(NO 3 ) 2 Solution, weigh 0.950g crab shell carrier with electronic balance balance, pour into Co(NO 3 ) 2 In the solution, it was ultrasonicated in an ultrasonic cleaner for 30 minutes, then placed in an oven at 30°C and 80°C for 24 hours, and after being completely dried, it was baked at 600°C in a muffle furnace for 2 hours to obtain...

Embodiment 2

[0037] Taking the 10% Co / crab shell catalyst with a cobalt mass percentage of 10% as an example, it is prepared by an equal volume impregnation method, and the specific steps are as follows:

[0038] Clean fresh portunus trituberculatus shells, dry them at 100°C for 24 hours, place them in a muffle furnace and roast them at 600°C in an air atmosphere for 3 hours, cool them down to room temperature, and grind them to obtain a crab shell carrier. Weigh 0.4932g cobalt nitrate hexahydrate Co(NO 3 )2 ·6H 2 O is placed in a 50ml beaker, and 0.90ml of deionized water is taken with a pipette gun to dissolve cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O gets Co(NO 3 ) 2 Solution, weigh 0.900g crab shell carrier with electronic balance balance, pour into Co(NO 3 ) 2 In the solution, sonicate in an ultrasonic cleaning machine for 30 minutes, then place in an oven at 30°C and 80°C for 24 hours, and after being completely dried, place it in a muffle furnace at 600°C for 2 hours to ...

Embodiment 3

[0040] 600 2h-5% Co-CaCO with 5% cobalt mass percent 3 Catalyst is taken as an example, prepared by excessive impregnation method, the specific steps are as follows: CaCO 3 Placed in a muffle furnace at 600°C for 2 h and cooled to room temperature. Weigh 0.2466g cobalt nitrate hexahydrate Co(NO 3 ) 2 6H2O was placed in a 50ml beaker, and 10ml of deionized water was taken with a measuring cylinder to dissolve cobalt nitrate hexahydrate Co(NO 3 ) 2 ·6H 2 O gets Co(NO 3 ) 2 solution, weigh 0.950g CaCO with an electronic balance 3 , into Co(NO 3 ) 2 In the solution, place the beaker on a magnetic stirrer and stir for 2 hours, let it stand for stratification, extract the supernatant and discard it, and place it in an oven at 30°C and 80°C for 24 hours in turn, and after it is completely dry, place it in a muffle furnace at a temperature of 600°C 5% Co / CaCO was obtained after lower calcination for 2h 3 catalyst.

[0041] Take 0.0100g of the catalyst prepared in the above...

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Abstract

The invention discloses a cobalt-based catalyst for reverse water-gas shift. The cobalt-based catalyst is obtained by loading Co on a carrier through adopting an immersion method; the carrier is a crab shell or CaCO3 powder; the mass percent of the Co in the cobalt-based catalyst is 5 percent to 20 percent. The cobalt-based catalyst can be used for effectively catalyzing a reverse water-gas shift reaction and inhibiting a methanation reaction; the selectivity of the catalyst is improved; meanwhile, the catalyst has good stability.

Description

technical field [0001] The invention relates to a catalyst for reverse water gas shift, in particular to a cobalt-based catalyst for reverse water gas shift. Background technique [0002] The reverse water gas shift reaction equation is as follows: [0003] CO 2 +H 2 =CO+H 2 O ΔH=+41kJ / mol [0004] The reaction is a reversible endothermic equimolar reaction, and high temperature is beneficial to the reverse water gas shift reaction. [0005] In recent years, in order to solve problems such as energy shortage, resource shortage and greenhouse gas effect, countries around the world have paid great attention to CO 2 development and utilization research. CO 2 As a carbon source, it is considered to be an inevitable development trend for human beings to use carbon sources. CO in the atmosphere and water 2 The carbon content is ten times that of oil, natural gas and coal. Therefore, when oil, gas, and coal resources are in short supply, CO 2 After all, it is a good carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/232
CPCB01J27/232
Inventor 戴惠虹王路辉刘辉张文泰万里李赞
Owner ZHEJIANG OCEAN UNIV
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