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Carbon dioxide methanation catalyst and preparation method thereof

A technology for methanation catalyst and carbon dioxide, applied in the field of nickel-based carbon dioxide methanation catalyst and preparation thereof, can solve the problems of many by-products, no report on methanation catalyst, etc., and achieves mild process conditions, low cost and wide application range. Effect

Inactive Publication Date: 2010-07-14
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that there are many by-products, including CO and C 2 h 6 Wait
[0006] So far, nickel-based CO supported on airgel oxides 2 No methanation catalyst has been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1)Ni-Mg / SiO 2 Catalyst preparation

[0024] Weigh 5.8635g of nickel nitrate hexahydrate and 0.4161g of magnesium nitrate hexahydrate into a beaker, add water to dissolve and set the volume to a 50ml volumetric flask to obtain a nickel-magnesium mixed solution. Weigh 3.0g SiO2 2 Put the airgel carrier in a clean evaporating dish, pipette 22.5ml of the nickel-magnesium mixed solution into the beaker, then pour it into the evaporating dish at one time to impregnate the carrier, stir rapidly for 0.5h, and then let it stand for half an hour. Dry in a blast oven at 100°C for 3 hours, and at 160°C for 3 hours, then put it in a muffle furnace and bake at 500°C for 5 hours in a flowing air atmosphere to decompose the salt, and then dry it in H 2 Reduction treatment at 400°C in the stream for 3 hours, after cooling down to room temperature, oxygen passivation to obtain 15%Ni-0.5%Mg / SiO 2 catalyst. After tableting and sieving, the granules with a particle size of 40-60 mesh ar...

Embodiment 2

[0028] Take by weighing 5.8984g nickel nitrate hexahydrate and 0.8371g magnesium nitrate hexahydrate, follow the catalyst preparation method of Example 1 to obtain 15%Ni-1%Mg / SiO 2 catalyst for CO 2 Evaluation of methanation activity. CO at 400°C 2 The conversion rate reaches the maximum, which is 91.7%. At this time, CH 4 The selectivity is 99.9%.

Embodiment 3

[0030] Take by weighing 6.3522g nickel nitrate hexahydrate and 6.3105g magnesium nitrate hexahydrate, follow the catalyst preparation method of embodiment 1, obtain 15%Ni-7%Mg / SiO 2 catalyst for CO 2 Evaluation of methanation activity. CO at 440°C 2 The conversion rate reaches the maximum, which is 62.8%. At this time, CH 4 The selectivity is 99.0%.

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Abstract

The invention discloses a carbon dioxide methanation catalyst and a preparation method thereof. The carbon dioxide methanation catalyst takes an aerogel oxide as a vector, an additive is added, nickel is used as an active component, the additive is alkali metal or alkali earth metal, and the aerogel oxide vector is silicon dioxide, titanium dioxide, zirconium dioxide, aluminum oxide or a compoundthereof. The catalyst comprises the following components in percentage by weight: 5-40wt.% of nickel and 0.01-30wt.% of the additive. The catalyst of the invention has high catalytic activity and stability, and can effectively catalyze carbon dioxide to be hydrogenated into methane at normal pressure under the reaction conditions that the air speed is 2000-20000h<-1>, the ratio of H2 to CO2 is 4:1, and the temperature is 300-500 DEG C. The maximum conversion rate of CO2 is higher than 90% and the maximum selectivity of CH4 is 99.9%. The preparation method of the catalyst of the invention has the advantages of simplicity, easy operation, lower cost and certain application prospects.

Description

technical field [0001] The invention relates to a carbon dioxide methanation catalyst, in particular to an auxiliary-containing nickel-based carbon dioxide methanation catalyst with an airgel oxide as a carrier and a preparation method thereof. Background technique [0002] As we all know, global warming is the most serious environmental problem facing mankind so far, and it is also one of the most complex challenges facing mankind in the 21st century. Carbon dioxide is one of the main emissions from large-scale industrial production, and it is also the main gas that causes the greenhouse effect. To reduce CO 2 Accumulation in the atmosphere, emission reduction is one aspect, how to quickly convert it is also particularly important, and CO 2 converted to CH by hydrogenation 4 , to achieve rapid methanation through catalysis, which not only realizes CO 2 Resource utilization has synthesized new energy, therefore, CO 2 The methanation reaction of catalytic hydrogenation h...

Claims

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Application Information

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IPC IPC(8): B01J23/78C07C9/04C07C1/12
Inventor 赵永祥高晓庆王永钊武瑞芳王宁
Owner SHANXI UNIV
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