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Low-temperature stable mixed-conductor oxygen permeable membrane in perovskite type barium-containing iron series

A technology of mixed conductor and perovskite type, which is applied in the field of mixed conductor oxygen permeable membrane, can solve the problems of membrane permeation flux decline and failure to reach a stable state, and achieve good stability and high oxygen permeability.

Inactive Publication Date: 2013-01-16
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

According to recent studies on perovskite-type mixed conductor oxygen-permeable membranes at medium and low temperatures, the permeation flux of the membranes will decrease rapidly with time and cannot reach a steady state.

Method used

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  • Low-temperature stable mixed-conductor oxygen permeable membrane in perovskite type barium-containing iron series
  • Low-temperature stable mixed-conductor oxygen permeable membrane in perovskite type barium-containing iron series
  • Low-temperature stable mixed-conductor oxygen permeable membrane in perovskite type barium-containing iron series

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of Ba by solid-phase synthesis 0.2 Sr 0.8 Fe 0.5 Cu 0.45 Ti 0.05 o 2.3 Powder. The obtained powder was subjected to X-ray diffraction analysis, and the result was a pure perovskite phase. Press the powder into a membrane under a pressure of 200-300MPa and evaluate the oxygen permeability under the condition of 700°C. The thickness of the membrane is 0.5mm, and it is sealed with silver. The air flow rate is 150ml / min, and the helium flow rate is 50ml / min. And apply La evenly on both sides of the diaphragm 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 Catalyst slurry, the oxygen permeability can be maintained at 1.5mlcm within 500 hours -2 min -1 Left and right no attenuation was seen.

Embodiment 2

[0024] Preparation of Ba by solid-phase synthesis 0.95 Gd 0.05 Fe 0.7 Cr 0.25 Mo 0.05 o 2.9Powder. The obtained powder was subjected to X-ray diffraction analysis, and the result was a pure perovskite phase. Press the powder into a membrane under a pressure of 200-300MPa to evaluate the oxygen permeability at 675°C. The thickness of the membrane is 0.5mm, and evenly coat both sides of the membrane with Pr 2 o 3 Catalyst slurry, sealed with silver, air flow rate: 150ml / min, helium flow rate: 50ml / min. Oxygen permeability has not declined within 200 hours and is stable at 0.8mlcm -2 min -1 about.

Embodiment 3

[0026] Preparation of La by solid-phase synthesis 0.3 Sr 0.3 Ba 0.4 Fe 0.9 mn 0.1 o 2.35 Powder. The obtained powder was subjected to X-ray diffraction analysis, and the result was a pure perovskite phase. Press the powder into a membrane under a pressure of 200-300MPa to evaluate the oxygen permeability at 650°C. The thickness of the membrane is 0.5mm, and the two sides of the membrane are evenly coated with La 0.6 Sr 0.4 co 0.2 Fe 0.8 o 3 -Co 3 o 4 (40-wt.%) catalyst paste was sealed with silver. The air flow rate is 150ml / min, and the helium flow rate is 50ml / min. Tested under the condition of 650°C, the oxygen transmission rate has not decayed within 300 hours and is stable at 0.5mlcm -2 min -1 about.

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Abstract

The invention discloses a low-temperature stable mixed-conductor oxygen permeable membrane in perovskite type (the general formula of perovskite is ABO3) barium-containing iron series, the chemical formula of the oxygen permeable membrane is Ba1-xA'xFe1-yB'yO3-delta, wherein 0< / =x< / =0.8, 0< / =y< / =0.5, 0<delta< / =0.7, A' refers to one or more of elements of Ca, Sr, Y, La, Ce, Pr, Nd, Sm, Gd, Er and Yb, and B' refers to one or more of elements of Mg, Al, Sc, Ti, Cr, Mn, Co, Ni, Cu, Zn, Ga, Y, Zr, Nb, Mo, In, Ce, Sm, Gd, Er, Yb, Ta and Bi. The membrane is prepared by means of preparing primary powder serving as oxygen permeable membrane powder by the aid of EDTA ( ethylene diamine tetraacetic acid)-citric acid combined complexometry or a solid-phase synthesis method, pressing the power under the pressure of 200-300MPa to form the membrane prior to roasting for 1-10 hours at the temperature of 1000-1400 DEG C and finally uniformly coating one or more of catalysts capable of increasing surface exchange rate on the surface of the membrane. The low-temperature stable mixed-conductor oxygen permeable membrane is excellent in stability and high in oxygen permeable capability at the medium and low temperature of 350-700 DEG C and can be used for selectively separating oxygen from oxygen-containing gas mixture, in particular from air.

Description

technical field [0001] The invention belongs to the technical field of mixed-conductor oxygen-permeable membranes, and in particular relates to a mixed-conductor oxygen-permeable membrane stable at low temperature in the perovskite type barium-iron series. Background technique [0002] Oxygen accounts for 21% of the air, ranking among the top five in the production of bulk chemicals in the world. Separating oxygen from air is a large industry, producing nearly 100 million tons of oxygen per year. For example, small-scale oxygen pumps used in medicine and large-scale combustion reactions, steelmaking and glass manufacturing industries that require extremely high oxygen purity all require oxygen supply. Oxygen-enriched combustion processes, oxygen-blown oxidation to convert coal and natural gas into synthesis gas, and other chemical operations facilitate the production of tonnages of oxygen. With the demand for oxygen in large-scale clean energy technologies, it is believed ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D53/22C01B13/02
Inventor 杨维慎刘妍朱雪峰丛铀
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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