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Oxygen carrier for methane chemical looping combustion and preparation method for oxygen carrier

A technology of chemical looping combustion and oxygen carrier, which is applied in the direction of fuel, fuel additive, petroleum industry, etc., can solve the problems of poor reactivity and oxygen carrying capacity of iron-based oxygen carrier, incomplete reaction of fuel gas, and slow reaction rate, etc., to achieve Easy to realize industrialization, increase methane conversion rate, complete reaction effect

Inactive Publication Date: 2012-08-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although Fe-based oxygen carriers have the advantages of low cost and no secondary pollution, the reactivity and oxygen-carrying capacity of Fe-based oxygen carriers are poor, although the reaction product is relatively simple CO 2 , but its reactivity is poor, showing that the reaction of fuel gas is incomplete, the conversion rate is low, and the reaction rate is slow, resulting in the CO in the product gas 2 The concentration is reduced, so the modification of Fe-based oxygen carriers is still the focus of chemical looping combustion research

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Press CeO 2 :(Fe 2 o 3 +Al 2 o 3) with a mass percentage of 1%: 99%, Fe 2 o 3 :Al 2 o 3 The mass percentage is 10%: 90%, calculate the molar ratio of Ce ion, Fe ion, Al ion and then convert it into the corresponding nitrate mass ratio, then weigh 0.3784g of Ce(NO 3 ) 3 ·6H 2 O, 7.5138g of Fe(NO 3 ) 3 9H 2 O and 98.3473g of Al(NO 3 ) 3 9H 2 O, mixed to form a 0.5mol / L nitrate solution;

[0017] (2) At a reaction temperature of 70°C and a stirring speed of 200r / min, drop saturated ammonia solution into the nitrate solution obtained in step (1) as a precipitant for co-precipitation until the pH value of the solution reaches 11 and stop dripping Add ammonia water, and keep stirring at reaction temperature for 1 hour;

[0018] (3) Aging the mixed solution after co-precipitation obtained in step (2) for 2 hours at room temperature, and then obtaining a solid precipitate by suction filtration, then repeatedly washing and suction filtration of the solid pre...

Embodiment 2

[0022] (1) Press CeO 2 :(Fe 2 o 3 +Al 2 o 3 ) with a mass percentage of 1%: 99%, Fe 2 o 3 :Al 2 o 3 The mass percentage is 10%: 90%, calculate the molar ratio of Ce ion, Fe ion, Al ion and then convert it into the corresponding nitrate mass ratio, then weigh 0.3784g of Ce(NO 3 ) 3 ·6H 2 O, 7.5138g of Fe(NO 3 ) 3 9H 2 O and 98.3473g of Al(NO 3 ) 3 9H 2 O, mixed to form a 0.5mol / L nitrate solution;

[0023] (2) At a reaction temperature of 70°C and a stirring speed of 200r / min, drop saturated ammonia solution into the nitrate solution obtained in step (1) as a precipitant for co-precipitation until the pH value of the solution reaches 11 and stop dripping Add ammonia water, and keep stirring at reaction temperature for 1 hour;

[0024] (3) Aging the mixed solution after co-precipitation obtained in step (2) for 2 hours at room temperature, and then obtaining a solid precipitate by suction filtration, then repeatedly washing and suction filtration of the solid pr...

Embodiment 3

[0028] (1) Press CeO 2 :(Fe 2 o 3 +Al 2 o 3 ) with a mass percentage of 1%: 99%, Fe 2 o 3 :Al 2 o 3 The mass percentage is 30%: 70%, calculate the molar ratio of Ce ion, Fe ion, Al ion and then convert it into the corresponding nitrate mass ratio, and then weigh 0.3784g of Ce(NO 3 ) 3 ·6H 2 O, 22.5414g of Fe(NO 3 ) 3 9H 2 O and 76.4924g of Al(NO 3 ) 3 9H 2 O, mixed to form a 0.5mol / L nitrate solution;

[0029] (2) At a reaction temperature of 70°C and a stirring speed of 200r / min, drop saturated ammonia solution into the nitrate solution obtained in step (1) as a precipitant for co-precipitation until the pH value of the solution reaches 11 and stop dripping Add ammonia water, and keep stirring at reaction temperature for 1 hour;

[0030] (3) Aging the mixed solution after co-precipitation obtained in step (2) for 2 hours at room temperature, and then obtaining a solid precipitate by suction filtration, then repeatedly washing and suction filtration of the sol...

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Abstract

The invention relates to an oxygen carrier for methane chemical looping combustion and a preparation method for the oxygen carrier. The oxygen carrier comprises Fe2O3, Al2O3, CeO2 and KNO3, wherein the mass ratio of the KNO3 to the (CeO2 + Fe2O3 + Al2O3) is (1-10)%: (99-90)%; the mass ratio of the CeO2 to the (Fe2O3 + Al2O3) is (1-20) %: (99-80)%; and the mass ratio of the Fe2O3 to the Al2O3 is (10-60) %: (90-40)%. The method comprises the following steps of: preparing a nitrate solution, adding aqueous ammonia serving as a precipitant for co-precipitation, performing suction filtration, washing, roasting, soaking in a potassium nitrate solution, drying, roasting, and thus obtaining the oxygen carrier for methane chemical looping combustion. The oxygen carrier has high CH4 conversion rate and quick conversion rate in full conversion reaction of methane, the reaction is full, the CO2 concentration of the product is high, and the method for preparing the oxygen carrier is simple and facilitates industrialization.

Description

technical field [0001] The invention relates to an oxygen carrier and a preparation method thereof, in particular to CH 4 A fully oxidized oxygen carrier added with additives and dopants and a preparation method thereof. Background technique [0002] Global warming has brought extensive and far-reaching impacts on human survival, economic and social development, and has become one of the most severe challenges facing mankind in the 21st century. With the development of industrial production and the improvement of people's living standards, more and more carbon dioxide is released from the combustion of coal, oil, natural gas and other substances, which has become one of the main reasons for the increasingly serious greenhouse effect. Therefore, reducing CO 2 It has become a research hotspot in the world today. In 1999, the U.S. Department of Energy proposed three main ways to reduce carbon into the atmosphere: (1) use energy more efficiently to reduce the use of carbon-ba...

Claims

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Application Information

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IPC IPC(8): C10L10/00
Inventor 李孔斋段月娟王华魏永刚祝星杜云鹏刘自松
Owner KUNMING UNIV OF SCI & TECH
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