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Application of double perovskite type oxide oxygen carrier in hydrogen production of chemical chain and preparation method

A double perovskite and oxide technology, applied in the field of chemical chain hydrogen production, can solve the problems of low dispersion of metal oxides, large pressure drop in the reaction bed, small pore size of oxygen carriers, etc., to achieve rich structural defects and Oxygen vacancies, improved catalytic performance, and simple preparation methods

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relatively speaking, the oxygen carrier NiO / NiAl 2 o 4 (CHO P etc. Fuel, 2004, 83(9)), Fe 2 o 3 / Al 2 o 3 (MATTISSONT etc. Fuel, 2001, 80(13)) and CoO-NiO / YSZ (JIN H G etc. Energy Fuels, 1998, 12(6)) have better overall performance, but there are large pressure drop in the reaction bed and load Oxygen has small pore size, limited oxygen carrying rate, low cycle reactivity, cannot withstand high reaction temperature, and low dispersion of metal oxides in oxygen carrier.

Method used

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  • Application of double perovskite type oxide oxygen carrier in hydrogen production of chemical chain and preparation method
  • Application of double perovskite type oxide oxygen carrier in hydrogen production of chemical chain and preparation method
  • Application of double perovskite type oxide oxygen carrier in hydrogen production of chemical chain and preparation method

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Experimental program
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Effect test

Embodiment 1

[0020] Take 16g Fe(NO 3 ) 3 9H 2 O, 11.5gNi(NO 3 ) 2 ·6H 2 Put O into a 500mL beaker, where the molar ratio of Fe to Ni is 1 / 1, add 100mL of distilled water, then place the beaker in a water bath at 80°C, stir at 400rpm, and stir until completely dissolved. Take 34.3g La(NO 3 ) 3 ·6H 2 O, put it in a beaker with 100mL distilled water, stir until it is completely dissolved. Then add the lanthanum nitrate solution dropwise into the mixed solution of ferric nitrate and nickel nitrate, and stir while adding dropwise. Take 40g of citric acid, the molar ratio of citric acid to the total amount of metal ions is 1.2:1, put it into a 100mL beaker and stir until it is completely dissolved. After the above mixed solution is stirred for 30 minutes, slowly add the citric acid solution, while adding While stirring. After stirring for 5 hours, the brown solution had been dehydrated and turned into a viscous gel. The gel was taken out and placed in a drying oven at 110° C. to dry ov...

Embodiment 2

[0022] Take 16g Fe(NO 3 ) 3 9H 2O, 11.5gNi(NO 3 ) 2 ·6H 2 Put O into a 500mL beaker, where the molar ratio of Fe to Ni is 1 / 1, add 100mL of distilled water, then place the beaker in a water bath at 80°C, stir at 400rpm, and stir until completely dissolved. Take 34.3g La(NO 3 ) 3 ·6H 2 O, put it in a beaker with 100mL distilled water, stir until it is completely dissolved. Then add the lanthanum nitrate solution dropwise into the mixed solution of ferric nitrate and nickel nitrate, and stir while adding dropwise. Take 67g of citric acid, the molar ratio of citric acid to the total amount of metal ions is 1.2:1, put it into a 100mL beaker and stir until it is completely dissolved. After the above mixed solution is stirred for 30 minutes, slowly add the citric acid solution, while adding While stirring. After stirring for 5 hours, the brown solution had been dehydrated and turned into a viscous gel. The gel was taken out and placed in a drying oven at 110° C. to dry ove...

Embodiment 3

[0024] Take 16g Fe(NO 3 ) 3 9H 2 O, 11.5gNi(NO 3 ) 2 ·6H 2 Put O into a 500mL beaker, where the molar ratio of Fe to Ni is 1 / 1, add 100mL of distilled water, then place the beaker in a water bath at 80°C, stir at 400rpm, and stir until completely dissolved. Take 34.3g La(NO 3 ) 3 ·6H 2 O, put it in a beaker with 100mL distilled water, stir until it is completely dissolved. Then add the lanthanum nitrate solution dropwise into the mixed solution of ferric nitrate and nickel nitrate, and stir while adding dropwise. Take 100g of citric acid, the molar ratio of citric acid to the total amount of metal ions is 3:1, put it into a 100mL beaker and stir until completely dissolved, after stirring the above mixed solution for 30 minutes, slowly add the citric acid solution, dropwise While stirring. After stirring for 5 hours, the brown solution had been dehydrated and turned into a viscous gel. The gel was taken out and placed in a drying oven at 110° C. to dry overnight. The...

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Abstract

The invention discloses application of a double perovskite type oxide oxygen carrier in the hydrogen production of a chemical chain and a preparation method. The oxygen carrier is a composite metal oxide with a double perovskite structure; the general formula of the composite metal oxide is A2B'B''O6, wherein A is rare earth metal lanthanum, B' is transition metal nickel, and B'' is transition metal iron; the combustion temperature of the oxygen carrier in water vapor is 500-1,000 DEG C; the reduction temperature of the oxygen carrier in fuel after the oxygen carrier is combusted is 500-1,000 DEG C; and the reaction pressure is the normal pressure. The preparation method comprises the following steps of: taking iron nitrate, nickel nitrate and lanthanum nitrate as precursors, taking citric acid as a complexing agent, preparing a solution from the precursors and the complexing agent, and evenly mixing and stirring; and then, carrying out water evaporation while the solution changes into viscous gel from transparent colloidal sol, then, drying, and roasting, wherein the roasted sample is the composite metal oxide with the double perovskite structure. The oxygen carrier prepared by the preparation method has high oxygen-carrying rate, high activity and good stability.

Description

technical field [0001] The invention relates to the application and preparation method of a double perovskite oxide oxygen carrier in chemical chain hydrogen production, which belongs to the catalyst technology in the field of chemical chain hydrogen production. Background technique [0002] In the traditional direct combustion process of fossil fuels, due to the N 2 dilution, the CO in the flue gas produced 2 Only 10% to 14%, CO 2 The separation energy consumption is high. Combining new energy conversion principles with CO 2 The combination of enrichment process is undoubtedly a very transformative development direction to solve the problem of fossil energy utilization and environmental protection. Based on chemical looping combustion (CLC) technology with low energy consumption CO 2 Enrichment, high energy conversion efficiency, low conventional pollutants (NO x and SO x etc.) characteristics such as emissions have become the main research direction. The chemical l...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J35/02C01B3/02
Inventor 梁皓张舒冬倪向前
Owner CHINA PETROLEUM & CHEM CORP
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