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Application of composite metal oxide oxygen carrier to recycle chemistry chain hydrogen production and preparation thereof

A technology of composite oxides and oxygen carriers, 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, and small pore size of oxygen carriers, so as to promote oxidation-reduction process, good thermal stability and simple preparation method

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 composite metal oxide oxygen carrier to recycle chemistry chain hydrogen production and preparation thereof
  • Application of composite metal oxide oxygen carrier to recycle chemistry chain hydrogen production and preparation thereof
  • Application of composite metal oxide oxygen carrier to recycle chemistry chain hydrogen production and preparation thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take 28.8g Fe(NO 3 ) 3 9H 2 O, 2.3gNi(NO 3 ) 2 ·6H 2 Put O into a 500mL beaker, where the molar ratio of Fe 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 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 d...

Embodiment 2

[0021] Take 22.4g Fe(NO 3 ) 3 9H 2 O, 6.9gNi(NO 3 ) 2 ·6H 2 O was put into a 500mL beaker, wherein the molar ratio of Fe to Ni was 0.7 / 0.3, and stirred 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 into the ferric nitrate solution, 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 dr...

Embodiment 3

[0023] Take 16g Fe(NO 3 ) 3 9H 2 O, 11.5gNi(NO 3 ) 2 ·6H 2Put O into a 500mL beaker, where the molar ratio of Fe to Ni is 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 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...

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Abstract

The invention discloses an application of a composite metal oxides oxygen carrier to recycle chemistry chain hydrogen production and a preparation thereof, the oxygen carrier is composite metal oxide with a perovskite structure, the general formula is AB'xB1-xO3, wherein A is rare earth metal lanthanum, B' is doped metal nickel, B is transition metal ferrum, and 0<x is more than zero and smaller than one<1. The reaction temperature of the oxygen carrier in a fuel reactor is 600 DEG C to 1200 DEG C, and the reaction temperature of the oxygen carrier in an oxidation reactor is 600 DEG C to 1200 DEG C. The preparation process is as follows: taking ferric nitrate, nickel nitrate and lanthanum nitrate as a precursor, and taking citric acid as complexant to make solution, and then uniformly mixing and stirring the solution; and then performing evaporation to make the solution to change from transparent sol into viscous gel from transparent sol, then drying and calcining the gel, and the calcinated sample isbeing the composite metal oxide with the perovskite structure. The oxygen carrier of the invention is high in oxygen carrying rate, is high in activity and is good in stability.

Description

technical field [0001] The invention relates to the application and preparation of a composite metal oxide oxygen carrier in chemical chain cycle hydrogen production, and belongs to the catalyst technology in the field of chemical chain hydrogen production. Background technique [0002] Chemical looping combustion (CLC) is a novel combustion method. The fuel is not in direct contact with the air, and the metal oxide is used as the oxygen carrier. The oxygen carrier is oxidized in the air at a certain temperature. ; Then carry out reduction reaction with fuel gas to release oxygen. The product of the gas phase reaction is only CO 2 and H 2 O (gas), condense water to obtain high-purity CO 2 . CO in chemical looping combustion 2 It will not be diluted by nitrogen in the air, so CO can be realized without energy loss 2 separate. A complete description of the chemical cycle combustion method can be found in French patent applications 02-14,071 and 04-08,549. [0003] As a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
Inventor 梁皓张舒冬倪向前
Owner CHINA PETROLEUM & CHEM CORP
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