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High-performance oxygen adsorbent and preparation method thereof

An oxygen adsorbent and adsorbent technology, applied in the field of high-performance oxygen adsorbent and its preparation, can solve problems such as structural limitation of practical application and the like

Inactive Publication Date: 2015-08-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally believed that Co-containing mixed conductors have high oxygen adsorption capacity, but the structural instability of Co-containing materials limits its practical application.

Method used

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  • High-performance oxygen adsorbent and preparation method thereof
  • High-performance oxygen adsorbent and preparation method thereof
  • High-performance oxygen adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take a certain amount of BaCO 3 , SrCO 3 , Al 2 o 3 and Fe 2 o 3 The material powder is mixed according to the molar ratio of 3:17:3:17, and then ball milled after adding an appropriate amount of ethanol. After ball milling, the evenly mixed material is dried, compacted, and put into a muffle furnace for high-temperature roasting to obtain calcium with large particles. Titanium Oxide Powder Ba 0.15 Sr 0.85 al 0.15 Fe 0.85 o 3-δ .

[0036] Co 2 o 3 ,TiO 2 and Nb 2 o 5 Replace Al in the above steps in turn 2 o 3 , repeat the operation to obtain larger particles of Ba 0.15 Sr 0.85 co 0.15 Fe 0.85 o 3-δ , Ba 0.15 Sr 0.85 Ti 0.15 Fe 0.85 o 3-δ and Ba 0.15 Sr 0.85 Nb 0.15 Fe 0.85 o 3-δ oxide powder;

Embodiment 2

[0038] The large particle oxide powder obtained in Example 1 is dried after secondary ball milling, and a small amount of powder is taken for XRD characterization, the results are as follows figure 1 As shown, Ba 0.15 Sr 0.85 al 0.15 Fe 0.85 o 3-δ , Ba 0.15 Sr 0.85 co 0.15 Fe 0.85 o 3-δ and Ba 0.15 Sr 0.85 Ti 0.15 Fe 0.85 o 3-δ The oxide powders are all phase-pure perovskite structures, Ba 0.15 Sr 0.85 Nb 0.15 Fe 0.85 o 3-δ The oxide powder is impure phase perovskite. Further high-temperature HT-XRD tests were carried out on each oxide powder, and the perovskite structure was still not damaged after the oxide powder was heated to 1000 °C. At the same time, a stability test was carried out. After firing each oxide powder in the air at 800°C for 100 hours, the XRD results showed that Ba 0.15 Sr 0.85 al 0.15 Fe 0.85 o 3-δ , Ba 0.15 Sr 0.85 co 0.15 Fe 0.85 o 3-δ and Ba 0.15 Sr 0.85 Ti 0.15 Fe 0.85 o 3-δ The oxide powder is still a pure-phase perov...

Embodiment 3

[0040] With each perovskite oxide material powder that embodiment 1 makes, adopt dry pressing method, in the pressure of 4MP, after holding the pressure for 30-60 seconds, press into strip-shaped blanks, and then Ba 0.15 Sr 0.85 al 0.15 Fe 0.85 o 3-δ , Ba 0.15 Sr 0.85 co 0.15 Fe 0.85 o 3-δ , Ba 0.15 Sr 0.85 Ti 0.15 Fe 0.85 o 3-δ and Ba 0.15 Sr 0.85 FeO 3-δ Strip blanks are placed in a muffle furnace and sintered at 1300-1450°C to obtain strip-shaped ceramic blocks. The measured electrical conductivity is as follows: figure 2 Shown (a, b, c, d in the figure represent Ba 0.15 Sr 0.85 co 0.15 Fe 0.85 o 3-δ 、Ba 0.15 Sr 0.85 FeO 3-δ 、Ba 0.15 Sr 0.85 al 0.15 Fe 0.85 o 3-δ 、Ba 0.15 Sr 0.85 Ti 0.15 Fe 0.85 o 3-δ ).

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Abstract

The invention relates to a high-performance oxygen adsorbent and a preparation method thereof, wherein the oxygen adsorbent material is a mixed conductor ceramic material having oxygen selectivity, and provides extremely high oxygen selectivity by using lattice oxygen vacancy to carry out chemical adsorption and desorption on oxygen when the temperature is increased or decreased. The production method comprises: uniformly mixing raw materials according to a ratio, calcining for a certain time at a high temperature to prepare large-particle oxide powder, and carrying out double ball milling to refine the particles so as to prepare the multi-metal composite oxide powder. The novel oxygen adsorbent of the present invention can be used for temperature changing oxygen adsorbing and has high oxygen adsorption.

Description

technical field [0001] The invention belongs to the field of chemical application technology, and in particular relates to a high-performance oxygen adsorbent and a preparation method thereof. Background technique [0002] Oxygen is a chemically active gas. With the development of society, oxygen has been widely used in petrochemical industry, smelting industry, national defense industry, medical care and other fields. At present, the main methods of oxygen production are traditional cryogenic distillation, membrane separation and pressure swing adsorption. The low temperature method is a relatively traditional method of oxygen production. Through air compression, cooling, saturated liquefaction of humid air, and then using the difference in boiling point of the oxygen and nitrogen components, oxygen and nitrogen are separated by rectification to obtain high-purity oxygen and nitrogen. The cryogenic method is mature and suitable for large-scale production of high-purity oxy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30B01D53/04C01B13/02
Inventor 杨维慎鲁辉张晋娜
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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