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Method for improving oxygen desorption performance of double perovskite oxide

A double perovskite and oxide technology, applied in the direction of alkali metal oxides/hydroxides, chemical instruments and methods, cobalt compounds, etc., can solve the problems of not being able to improve the oxygen desorption performance to a greater extent, and achieve technological Simple and convenient effect

Active Publication Date: 2021-05-14
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these factors cannot directly affect the microscopic ions in the gel formation process, so they cannot improve the oxygen desorption performance of the sample to a greater extent.

Method used

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  • Method for improving oxygen desorption performance of double perovskite oxide

Examples

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Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: PrBaCo at pH=2 2 o 6-δ Preparation of double perovskite oxygen carrier powder

[0018] Concrete preparation process is as follows:

[0019] (1) Weigh the analytically pure Pr(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O. where Pr(NO 3 ) 3 ·6H 2 O is 0.02 mol. Add an appropriate amount of deionized water to make a metal nitrate aqueous solution; according to the total molar number of metal ions: citric acid: EDTA ratio of 1:1.5:1, weigh citric acid and EDTA and add it to the metal nitrate aqueous solution, add ammonia aqueous solution dropwise And slowly stir, measure the pH value of the solution to be 2, put it into a magnetic stirrer. Heat and stir at a constant temperature in a water bath magnetic stirrer at 80°C until uniform until a gel is formed;

[0020] (2) Put the above-mentioned stirred wet gel into a drying oven, and dry at 120° C. until a dry gel is formed;

[0021] (3) Take out the dry gel, grind it and put it into ...

Embodiment 2

[0024] Example 2: PrBaCo at pH=4 2 o 6-δ Preparation of double perovskite oxygen carrier powder

[0025] Concrete preparation process is as follows:

[0026] (1) Weigh the analytically pure Pr(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O. where Pr(NO 3 ) 3 ·6H 2 O is 0.02 mol. Add an appropriate amount of deionized water to make a metal nitrate aqueous solution; according to the total molar number of metal ions: citric acid: EDTA ratio of 1:1.5:1, weigh citric acid and EDTA and add it to the metal nitrate aqueous solution, add ammonia aqueous solution dropwise And stir slowly, measure the pH value of the solution to be 4 and put it into a magnetic stirrer. Heat and stir at a constant temperature in a water bath magnetic stirrer at 80°C until uniform until a gel is formed;

[0027] (2) Put the above-mentioned stirred wet gel into a drying oven, and dry at 120° C. until a dry gel is formed;

[0028] (3) Take out the dry gel, grind it and put it in...

Embodiment 3

[0030] Example 3: PrBaCo at pH=6 2 o 6-δ Preparation of double perovskite oxygen carrier powder

[0031] Concrete preparation process is as follows:

[0032] (1) Weigh the analytically pure Pr(NO 3 ) 3 ·6H 2 O, Ba(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O. where Pr(NO 3 ) 3 ·6H 2 O is 0.02 mol. Add an appropriate amount of deionized water to make a metal nitrate aqueous solution; according to the total molar number of metal ions: citric acid: EDTA ratio of 1:1.5:1, weigh citric acid and EDTA and add it to the metal nitrate aqueous solution, add ammonia aqueous solution dropwise And slowly stir, put into the magnetic stirrer after measuring the pH value of the solution to be 6. Heat and stir at a constant temperature in a water bath magnetic stirrer at 80°C until uniform until a gel is formed;

[0033] (2) Put the above-mentioned stirred wet gel into a drying oven, and dry at 120° C. until a dry gel is formed;

[0034] (3) Take out the dry gel, grind it and put it...

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Abstract

The invention belongs to the field of energy material research, and particularly relates to a method for improving oxygen desorption performance of double perovskite oxide. The method comprises the following steps: preparing a metal nitrate aqueous solution of double perovskite oxides; adding citric acid and EDTA into the metal nitrate aqueous solution according to a ratio of the citric acid to the EDTA of 1:1.2 to 1.5:1 by the total mole number of metal ions, adding deionized water, and performing stirring and dissolving to form a precursor solution; adjusting the pH value of the precursor solution to 6.0-7.0, carrying out water bath evaporation drying at 75-85 DEG C with stirring until a gel is formed, and then performing drying; and calcining the dried gel at 350-450 DEG C for 30 minutes, heating the gel to 800-850 DEG C, and performing calcining for 7-8 hours. The invention proposes that the pH value has important influence on the oxygen desorption performance of the double perovskite oxide for the first time, and by adjusting the preparation process and performing pH adjustment in specific steps, the finally prepared double perovskite oxide has excellent oxygen desorption performance.

Description

technical field [0001] The invention belongs to the field of energy material research, in particular to a method for improving the oxygen desorption performance of double perovskite oxides. Background technique [0002] Oxygen-enriched combustion technology is currently a very effective way to reduce CO 2 Emission technology path. Since this combustion method requires a high concentration of oxygen, it will produce a very large waste of resources and energy consumption. The perovskite oxygen carrier can perfectly provide the O required for oxyfuel combustion. 2 / CO 2 Mixed gas, the use of perovskite oxides can improve combustion efficiency, thereby achieving CO 2 zero emission. Therefore, it is very important to prepare perovskite with better oxygen desorption performance. [0003] At present, a common method for preparing perovskite oxides is the sol-gel process, which has a low synthesis temperature, high purity of the prepared product, fine and uniform particles (ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C01B13/02C01G51/00
CPCC01G51/70C01B13/02B01J20/06B01J20/28016Y02E20/34
Inventor 沈秋婉李世安姜宇航杨国刚邵子城董爽爽陈彪杰王涵周洋
Owner DALIAN MARITIME UNIVERSITY
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