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Application and preparation of a composite oxide oxygen carrier in chemical chain cycle hydrogen production

An oxygen carrier and oxide technology, applied in the field of chemical chain hydrogen production, can solve the problems of low dispersity of metal oxides, low cyclic reactivity, high reaction temperature, etc., so as to improve the oxygen carrying rate and activity, and prolong the cycle. number of times, the effect of improving oxygen carrying rate and activity

Active Publication Date: 2015-08-12
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 a composite oxide oxygen carrier in chemical chain cycle hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Take 20.7gCo(NO 3 ) 2 ﹒ 6H 2 O and 2.3gNi(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker so that the molar ratio of Co to Ni 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 30.87g La(NO 3 ) 3 ﹒ 6H 2 O and 0.8g KNO 3 Put it into a beaker with 100mL of distilled water and stir until it is completely dissolved so that the molar ratio of La to K is 0.9 / 0.1. Then add the lanthanum nitrate and potassium nitrate solutions dropwise to the cobalt nitrate and nickel nitrate solutions, and stir while adding. 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 deh...

Embodiment 2

[0019] Take 21.85gCo(NO 3 ) 2 ﹒ 6H 2 O and 1.15gNi(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker so that the molar ratio of Co to Ni is 0.95 / 0.05, 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 29.15g La(NO 3 ) 3 ﹒ 6H 2 O and 1.2g KNO 3Put it into a beaker with 100mL of distilled water, stir until it is completely dissolved, so that the molar ratio of La to K is 0.85 / 0.15. Then add the lanthanum nitrate and potassium nitrate solutions dropwise to the cobalt nitrate solution, and stir while adding. Take 60g of citric acid, the molar ratio of citric acid to metal ions is 1.8:1, 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...

Embodiment 3

[0021] Take 16.1gCo(NO 3 ) 2 ﹒ 6H 2 O and 6.9gNi(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker so that the molar ratio of Co to Ni is 0.7 / 0.3, 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 27.44g La(NO 3 ) 3 ﹒ 6H 2 O and 1.6g KNO 3 Put it into a beaker with 100mL of distilled water and stir until it is completely dissolved so that the molar ratio of La to K is 0.8 / 0.2. Then add the lanthanum nitrate and potassium nitrate solutions dropwise to the cobalt nitrate solution, and stir while adding. Take 80g of citric acid, the molar ratio of citric acid to the total amount of metal ions is 2.4:1, 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 i...

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Abstract

The invention discloses applications and preparation of a composite oxide oxygen carrier with a perovskite structure in chemical looping cyclic hydrogen production. The oxygen carrier is a composite metal oxide with a perovskite structure, the general formula is AxA'1-xByB'1-yO3, wherein A is rare earth metal lanthanum, A' is metal potassium, B is transition metal nickel, B' is transition metal cobalt, x is less than 1 and more than 0.7, and y is more than 0 and less than 0.35. The reaction temperature of the oxygen carrier in fuel is 500-1250 DEG C, and the reaction temperature of the oxygen carrier in water vapor is 500-1250 DEG C. The oxygen carrier has advantages of large specific surface area, high oxygen carrying rate, high catalytic activity, strong resistance to carbon deposition, strong resistance to high-temperature sintering and good stability.

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): C01B3/06
CPCY02E60/36
Inventor 倪向前张喜文梁皓
Owner CHINA PETROLEUM & CHEM CORP
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