Oxygen adsorbent, preparation method and application thereof

An oxygen adsorbent and adsorbent technology, applied in the field of preparation and oxygen adsorbent, can solve the problems of high temperature sealing, simultaneous realization, and difficulty in mechanical stability, and achieve high oxygen selectivity, fast oxygen adsorption rate, and high oxygen adsorption capacity Effect

Inactive Publication Date: 2010-09-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] It has been more than 20 years since ceramic materials have been used as dense mixed-conductor oxygen-permeable membranes by pressing or extruding tubes, but this technology has not yet been industrialized on a large scale. Simultaneous realization on the same membrane material, and the problem of high temperature sealing

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  • Oxygen adsorbent, preparation method and application thereof
  • Oxygen adsorbent, preparation method and application thereof
  • Oxygen adsorbent, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Direct mixing of nitrate solutions of all metal ions to synthesize Ba 1-z Sr z co 0.8 Fe 0.2 o 3-δ A series of composite oxides, where 0≤z≤1. The stoichiometric metal ion (Ba 2+ 、Sr 2+ 、Co 2+ , Fe 3+ ) nitrate solution in a beaker, to which EDTA and citric acid were added, and the ratio of EDTA and citric acid to the amount of total metal ions was 1:1. Then use NH 3 ·H 2 O to adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a brown colloid with the continuous evaporation of water, decompose the colloid at 400°C to obtain the primary powder, and then make the primary powder The body was calcined at 950°C for 5 hours to obtain the composite oxide powder prepared from the mixed solution. Its XRD diagram and SEM diagram are as follows figure 1 and figure 2 . The prepared various powders were tableted and granulated under 75MPa respectively.

Embodiment 2

[0032] Synthesis of SrCo by directly mixing nitrate solutions of all metal ions 1-w Fe w o 3-δ A series of composite oxides, where 0≤w≤1. According to the stoichiometric ratio of various metal ions required for the synthesis of each oxide, the stoichiometric metal ions (Sr 2+ 、Co 2+ , Fe 3+ ) nitrate solution in a beaker, to which EDTA and citric acid were added, and the ratio of EDTA and citric acid to the amount of total metal ions was 1:1. Then use NH 3 ·H 2 O to adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a brown colloid with the continuous evaporation of water, decompose the colloid at 400°C to obtain the primary powder, and then make the primary powder The body was calcined at 950°C for 5 hours to obtain the composite oxide powder prepared from the mixed solution. The prepared various powders were tableted and granulated under 75MPa. Example 3

Embodiment 3

[0033] Synthesis of La by direct mixing of nitrate solutions of all metal ions 1-z Sr z CoO 3-δ A series of composite oxides, where 0≤z≤1. According to the stoichiometric ratio of the various metal ions required for the synthesis of each oxide, the stoichiometric metal ions (La 3+ 、Sr 2+ 、Co 2+ ) nitrate solution in a beaker, to which EDTA and citric acid were added, and the ratio of EDTA and citric acid to the amount of total metal ions was 1:1. Then use NH 3 ·H 2 O to adjust the pH of the solution to 6.0, heat and stir the solution at a constant temperature of 80°C, and finally obtain a brown colloid with the continuous evaporation of water, decompose the colloid at 400°C to obtain the primary powder, and then make the primary powder Calcined at 900°C for 5 hours to obtain various composite oxide powders prepared from the mixed solution, the crystal structure of which is the same as that of La 0.6 Sr 0.4 CoO 3-δ The perovskite structure, such as image 3 .

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Abstract

The invention provides an oxygen adsorbent, a preparation method and application thereof. The oxygen adsorbent material is a mixed conductor ceramic material which has oxygen (O2) selectivity and is subjected to chemical oxygen adsorption and deoxygenation by using oxygen vacancies (or gap oxygen positions) in crystal lattices; and the oxygen adsorbent only absorbs oxygen in air flow, but not absorbs any other non-oxygen components. The preparation method comprises the following steps of: mixing soluble salt solution of all metal ions forming a composite oxide uniformly; and preparing multi-metal composite oxide powder by using an organic acid complexing method and a concentrating and gelatinizing method. The novel oxygen adsorbent is used for high-temperature variable-pressure oxygen adsorption or variable-temperature oxygen adsorption so as to perform air separation, or remove impurities from trace oxygen, or be used as an oxygen-storing material. The novel oxygen adsorbent has the advantages of high oxygen adsorption capacity, high oxygen adsorption rate and extremely high oxygen selectivity.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an oxygen adsorbent, a preparation method and an application thereof. Background technique [0002] At present, the oxygen or nitrogen production market is still in a situation of fierce competition among low-temperature cold distillation, membrane separation and pressure swing adsorption technologies. The cryogenic method is a traditional oxygen and nitrogen production method with mature technology, and the pressure swing adsorption method and membrane separation method are new oxygen and nitrogen production technologies. Among them, the cryogenic method is suitable for large-scale production of high-purity oxygen and nitrogen (above 99%); the characteristics of organic membrane separation technology are: low-temperature operation, small scale, and the purity of oxygen-enriched production is 40% to 50%; pressure swing adsorption The characteristics are: medium and s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01D53/02C01B13/02
Inventor 杨维慎贺玉凤朱雪峰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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