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Application and preparation of an oxygen carrier with perovskite structure in chemical chain hydrogen production

A technology of perovskite structure and oxygen carrier, applied in the field of chemical chain hydrogen production, can solve the problems of low dispersion of metal oxides, low cyclic reactivity, high reaction temperature, etc., to promote the oxidation-reduction process, speed up Effect of cycle efficiency, simple preparation method

Active Publication Date: 2015-09-30
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 (MATTISSON T 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 limited oxygen loading rates and cyclic reactions low resistance, inability to withstand high reaction temperature, low dispersion of metal oxides in oxygen carriers, etc.

Method used

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  • Application and preparation of an oxygen carrier with perovskite structure in chemical chain hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take 20.7gCo(NO 3 ) 2 ·6H 2 O and 1.9gCu(NO 3 ) 2 ·3H 2 Put O into a 500mL beaker so that the molar ratio of Co to Cu is 0.9 / 0.1, 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 to the mixed solution of cobalt nitrate and copper 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. At this time, after the above mixed solution is stirred for 30 minutes, slowly add the citric acid solution, while Add 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 dryin...

Embodiment 2

[0020] Take 16.1gCo(NO 3 ) 2 ·6H 2 O and 5.7gCu(NO 3 ) 2 ·3H 2 Put O into a 500mL beaker, make the molar ratio of Co to Cu 0.7 / 0.3, and stir until completely dissolved. Add 100mL of distilled water, then place the beaker in a water bath at 80°C with a stirring speed of 400rpm. 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 to the cobalt nitrate and copper nitrate solutions, and stir while adding. 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 ...

Embodiment 3

[0022] Take 11.5g Co(NO 3 ) 2 ·6H 2 O, 9.5gCu(NO 3 ) 2 ·3H 2Put O into a 500mL beaker, make the molar ratio of Co to Cu 0.5 / 0.5, 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 to the mixed solution of cobalt nitrate and copper 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 ove...

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Abstract

The invention discloses an application of a composite oxide with a perovskite structure in chemical looping hydrogen production and a preparation thereof. the composite metal oxide with the perovskite structure is AB'xB1-xO3, wherein A is rare earth meal lanthanum, B and B' are respectively transition metals cobalt and copper, and x is less than 1 and greater than 0. The application of an oxygen carrier in chemical looping hydrogen production is as follows: the combustion temperature in a steam reactor is 500-800 DEG C and the reduction temperature in a fuel reactor is 500-800 DEG C. The preparation method of the oxygen carrier comprises the following steps of: preparing a solution from a precursor composed of cobalt nitrate, copper nitrate and lanthanum nitrate and citric acid or ethylene glycol which is used as a complexing agent, mixing and uniformly stirring, vaporizing moisture until the solution becomes a viscous gel from a transparent sol, and finally drying and roasting. The roasted sample is the composite metal oxide with the perovskite structure. The oxygen carrier provided by the invention has high oxygen carrying rate, high activity, good stability and the like.

Description

technical field [0001] The invention relates to the application and preparation method of a perovskite structure composite oxide in chemical chain cycle hydrogen production technology, belonging to the field of chemical chain hydrogen production. Background technique [0002] In 1983, German scientists Richter and Knoche first proposed the concept of chemical looping combustion (CLC). The biggest difference between this combustion technology and the usual combustion technology is that it does not directly use the oxygen molecules in the air, but uses the oxygen atoms in the oxygen carrier to complete the combustion process of the fuel, and the combustion products (mainly CO 2 and water vapor) will not be diluted by nitrogen in the air and the concentration is extremely high, and almost pure CO can be obtained by simple condensation 2 , simple and low energy consumption to achieve CO 2 In addition, due to the relatively low operating temperature of the fuel reactor and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/02B01J23/83
Inventor 倪向前梁皓张舒冬张喜文
Owner CHINA PETROLEUM & CHEM CORP
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