Composite oxide oxygen carrier and preparation method and application thereof

A composite oxide, oxygen carrier technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of low dispersion of metal oxides and cyclic reactivity problems such as low and high reaction temperature, to achieve the effect of improving oxygen-carrying rate and activity, high activity and simple preparation method

Active Publication Date: 2015-05-13
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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  • Composite oxide oxygen carrier and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 23gCo(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker, 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 solution, 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 dehydrated and turned into a viscous gel. The gel was taken out and placed in a drying oven at 110° C. to...

Embodiment 2

[0021] Take 23gCo(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker, 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 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 67g of citric acid, the molar ratio of citric acid to 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 overnight. Then take out the dried...

Embodiment 3

[0023] Take 23gCo(NO 3 ) 2 ﹒ 6H 2 Put O into a 500mL beaker, 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 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 overnight. The...

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Abstract

The invention discloses a composite oxide oxygen carrier and a preparation method and application thereof. The oxygen carrier is a composite metal oxide AxA'l-xBO3 with a perovskite structure, wherein A is rare earth metal lanthanum, A' is transition metallic potassium, B is transition metallic cobalt, and 0.7<x<1. The application of the oxygen carrier in chemical looping combustion technology is that the temperature of combustion in an air reactor is 450-850 DEG C, and the temperature of reduction in a fuel reactor is 450-850 DEG C. The preparation method of the oxygen carrier is that cobalt nitrate, lanthanum nitrate and potassium nitrate are used as a precursor, citric acid or ethylene glycol is used as a complexing agent, a solution is prepared and mixed and stirred evenly, then evaporation of water is conducted, the solution is converted into thick gel from transparent sol, finally drying and baking are conducted, and a sample after baking is the composite metal oxide with the perovskite structure. The oxygen carrier is high in oxygen carrying rate and catalytic activity, strong in carbon deposit resistance and good in stability.

Description

technical field [0001] The invention relates to a composite oxide oxygen carrier and its preparation method and application, specifically an oxygen carrier based on a perovskite type oxide as a chemical looping combustion technology and its preparation method and application, belonging to the field of chemical looping combustion catalyst technology. 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 concentration of low (generally 3.5 v%~14 v%) 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, while producing almost no nitrogen oxi...

Claims

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Application Information

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