A kind of composite oxide oxygen carrier and its preparation method and application

A technology of oxides and oxygen carriers, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of low metal oxide dispersion and low cycle reactivity , Oxygen loading rate is limited and other issues, to achieve the effect of increasing oxygen loading rate and activity, prolonging the number of cycles, increasing oxygen loading rate and activity

Active Publication Date: 2016-02-03
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 (CHOPetc. Fuel, 2004, 83 (9)), Fe 2 o 3 / Al 2 o 3 (MATTISSONTetc.Fuel, 2001, 80 (13)) and CoO-NiO / YSZ (JINH Getc. Energy Fuels, 1998, 12 (6)) have good comprehensive performance, but there are limited oxygen loading rate, low cycle reactivity, and inability to Withstand high reaction temperature, low dispersion of metal oxide in oxygen carrier, etc.

Method used

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  • A kind of composite oxide oxygen carrier and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 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 30.87gLa (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

[0020] 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 29.15gLa(NO 3 ) 3 ﹒ 6H 2 O and 1.2g KNO 3 Put 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 the total amount of 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 turne...

Embodiment 3

[0022] 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 27.44gLa (NO 3 ) 3 ﹒ 6H 2O 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 in...

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Abstract

The invention discloses a composite oxide oxygen carrier for chemical looping combustion, a preparation method and applications. The oxygen carrier is a composite metal oxide with a perovskite structure, 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 oxygen carrier is applied in the chemical looping combustion technology, the combustion temperature in an air reactor is 500-1250 DEG C, and the reduction temperature in a combustion reactor is 500-1250 DEG C. The oxygen carrier is advantaged by 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 present invention relates to a compound oxide oxygen carrier for chemical looping combustion and its preparation method and application, specifically the oxygen carrier with perovskite type oxide as the chemical looping combustion technology and its preparation method and application, belonging to Catalyst technology in the field of chemical looping combustion. Background technique [0002] Currently, worldwide interest in developing CO capture and storage 2 technology has generated considerable interest. CO in gas or coal-fired power plant flue gas 2 The low concentration of CO (generally 3.5v%~14v%) leads to the separation and capture of CO 2 The cost and energy consumption increase, so exploring new combustion methods is the solution to CO 2 An important outlet for capture. [0003] Chemical looping combustion technology is a novel combustion technology, which breaks the traditional concept of flame combustion, and realizes CO 2 Separation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83C10L10/00
Inventor 倪向前张喜文梁皓张舒东
Owner CHINA PETROLEUM & CHEM CORP
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