KR20150094071A - Ceramic adsorbent for removal of oxygen - Google Patents

Abstract

The present invention relates to an oxygen adsorbent composition for removing or producing oxygen containing perovskite-type powder represented by La_(1-x)Sr_xCo_(1-y)Fe_yO_(3-δ) (wherein x is in a range of 0 <= x <= 1, y is in a range of 0 <= y <= 1, and δ is in a range of 0 <= δ < 2). In addition, the oxygen adsorbent has excellent oxygen adsorption characteristics under x, y, and a specific temperature condition. The oxygen adsorbent composition of the present invention can be usefully used in an adsorption process for separating oxygen in high-temperature regions at more than or equal to 500 °C, and can be used in a pure oxygen combustion process or the like in order to provide high-purity oxygen.

Description

{Ceramic adsorbent for removal of oxygen}

The present invention relates to an oxygen adsorbent for removing trace oxygen contained in syngas and landfill gas or producing oxygen of high purity.

In a variety of industrial processes, syngas (CO + H ₂ ) is produced through partial oxidation, in which a trace amount of oxygen must act as impurities and be removed. In the case of landfill gas, complaints arise because the gas is released to the surrounding area as the surface of the landfill emits. In order to suppress this, the amount of forced capture of the landfill gas (LFG) is increased. In this process, oxygen (O2) and nitrogen (N2) in the landfill gas are increased by sucking air in the atmosphere. This is a cause of deterioration of the quality of the trapped gas. In particular, methane, oxygen, silicon, chlorine, water, sulfur compounds and dusts cause corrosion in the contact area of the engine generator and promote mechanical wear when the generator using the landfill gas is operated, In addition, the utilization rate, utilization rate, maintenance cycle, parts replacement cycle and operation maintenance cost of the generator can be greatly influenced.

Currently, commercially available oxygen removal and production technology is an oxygen production technology through nitrogen adsorption using a zeolite adsorbent, and a technique for adsorbing and removing only oxygen itself has not been commercialized yet. Furthermore, because oxygen adsorption usually occurs at low temperatures, oxygen adsorption techniques that are adsorbed at high temperatures have not been developed. However, in the case of producing synthesis gas by gasification or DME (dimethyl ether) using LFG, it is necessary to have a technique for removing trace amount of oxygen at high temperature because it is performed at high temperature (700 ° C. to 1000 ° C.) It is true.

An object of the present invention is to provide an oxygen adsorbent composition for selectively adsorbing or removing trace amounts of oxygen at high temperatures or producing oxygen of high purity.

In order to achieve the above object,

The present invention La _{1 -} to _y Fe _y O _{3 -δ} (where x is 0 ≤ x ≤ 1, y is 0 ≤ y ≤ 1, and δ is in the range of _{0 ≤ δ <2) - x} Sr x Co 1 There is provided an oxygen adsorbent composition for removing or producing oxygen containing a perovskite type powder to be displayed.

When the oxygen adsorbent composition according to the present invention is used, it can be effectively used in an adsorption process for separating oxygen at a high temperature region of 500 ° C or higher, and can be used in a pure oxygen combustion process to produce high purity oxygen.

Figure 1 relates to the structure of perovskite and the induction of oxygen deficiency.
2 shows the oxygen separation principle of an oxygen adsorbing perovskite adsorbent.
FIG. 3 is a _{graph showing} the particle size of La _{0 .6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 -δ} powder prepared by the citric acid method (CM) or the polymerized complex method (PCM) And specific surface area.
Figure 4 is a graph showing the XRD results of _{La 0 .6 Sr 0 .4 Co 0} .2 Fe 0 .8 O 3 -δ powder prepared by the polymerization method or a citrate complex.
5 shows an SEM result of _{La 0 .6 Sr 0 .4 Co 0} .2 Fe 0 .8 O 3 -δ powder prepared by the citrate method (a) or legitimate (b) of the complex
6 is a graph showing the breakthrough curves of La _{0 .6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 - δ} powder prepared by the citric acid method.
FIG. 7 is a graph showing the adsorption performance of LSCF powder prepared by the citric acid method and the complex polymerization method by temperature.
8 is a graph of XRD results of LSCF powders synthesized by varying the composition of x and y.
9 is a temperature-dependent breakthrough curve of the LSCF powder synthesized while varying the composition of x and y.
10 is a graph showing the oxygen adsorption performance of LSCF powder synthesized while changing the composition of x and y by temperature.
11 is a graph showing the temperature XRD results of LSCF (x = 0.9) powder synthesized while varying the composition of x and y.
12 is a graph comparing the oxygen adsorption capacity of LSCF (x = 0.9, y = 0.1) and LSCF (x = 0.9, y = 0.8)

Hereinafter, the present invention will be described in detail.

Currently, most of the oxygen separation technology is applied to the adsorption separation technology, the membrane separation technology and the deep cooling separation technology. Since the conventional oxygen separation techniques are all consuming a lot of energy for oxygen separation (0.36 kWh / Nm ³ -O _{2 for} deep-cooling separation, 0.37 kWh / Nm ³ -O _{2 for} adsorption separation) Research is underway. The oxygen separation technology using the adsorbent has a simpler device than the deep sea cooling method, and has a low oxygen production cost considering the same scale of oxygen production, but it is difficult to apply large scale oxygen production. In particular, the ratio of nitrogen and oxygen in the air is 80% / 20%. Therefore, by using an oxygen selective adsorbent, it is possible to reduce the size of the apparatus and apply a large capacity adsorption / separation technique. In recent years, BOC has developed the adsorption oxygen separation technology through the process called CAR process, and it has been able to reduce the equipment cost to a large capacity, and is currently carrying out empirical studies with the 0.7 TPD process. However, this technique is not suitable as a process to remove trace amounts of oxygen with a process focused on oxygen production. In addition, since the technique is not considered considering the post-stage of high temperature, the technology development is performed at a low temperature. That is, the conventional adsorption process and deep-cooling process are suitable for low temperature and are processes for producing oxygen, whereas the present invention is different from the prior art in that it is performed at a high temperature and selectively adsorbs trace amount of oxygen in less than 1%.

The present invention La _{1 -} to _y Fe _y O _{3 -δ} (where x is 0 ≤ x ≤ 1, y is 0 ≤ y ≤ 1, and δ is in the range of _{0 ≤ δ <2) - x} Sr x Co 1 There is provided an oxygen adsorbent composition for removing or producing oxygen containing a perovskite type powder to be displayed.

When x is 0.4, y decreases in the range of 0? Y? 1, and the oxygen adsorption amount increases as the adsorption temperature increases in the range of 500 to 900 占 폚,

When x is 0.9, y is reduced in the range of 0? Y? 1, and the adsorption amount is increased as the adsorption temperature is reduced in the range of 500 to 900 占 폚.

When x is 0.9, since the cost of iron is lower than that of cobalt, the cost of the adsorbent can be reduced when oxygen is produced in a large-scale process.

Unlike the LSCF powder having an Sr content of 0.4, the present invention is characterized in that the adsorptivity of the powder having an Sr content of 0.9 increases with decreasing temperature. Therefore, in the case of the powder having the Sr content of 0.9, the maximum adsorption amount is shown at a temperature of 700 ° C., and the amount of oxygen adsorption is decreased as the temperature is increased. An increase in the adsorption amount at a low temperature is suitable for the process of producing oxygen, and can be effectively used when it is necessary to remove oxygen in a low temperature process.

The adsorption temperature of the oxygen adsorbent composition may be 500 to 900 占 폚 at a high temperature. In addition, the oxygen adsorbent of the present invention may have reversible adsorption / desorption properties and may be reused at least about 15 times due to the above characteristics.

The present invention La of _{1 -} (wherein x is in the range of 0 ≤ x ≤ 1, y is 0 ≤ y ≤ 1, and δ is _{0 ≤ δ <2) y Fe} y O 3 -δ - x Sr x Co 1 The oxygen adsorbent composition for the removal or production of oxygen containing a perovskite-type powder represented by the formula (1) can increase the oxygen adsorption amount as x increases.

Also, when x is 0.4, y decreases and the oxygen adsorption amount increases as the temperature increases. When x is 0.9, y increases and as the temperature decreases, the amount of oxygen adsorption increases .

The oxygen adsorbent composition of the present invention can be produced by a high-temperature firing method, a citric acid method, or a complex polymerization method, and can be preferably prepared by a citric acid method, a complex polymerization method, and most preferably a complex polymerization method.

The oxygen adsorbent composition prepared by the citric acid method or the complex polymerization method is characterized by being a rhombohedral structure.

The oxygen adsorbent composition of the present invention can be used for the purpose of removing or producing oxygen. In particular, the oxygen adsorbent composition of the present invention can be used in processes for producing high purity oxygen, for example, but not exclusively, in a pure oxygen combustion process. The oxygen adsorbent composition of the present invention can also be used to remove oxygen contained in a syngas or landfill gas in a trace amount, but is not limited thereto.

The present invention also relates to a process for producing a perovskite-type powder comprising a perovskite-type powder represented by La _{0 .6} Sr _{0 .4} Co _{0 .4} Fe _{0 .6} O _{3 - δ} wherein δ is in the range of 0 ≦ δ <2, And the temperature is 900 DEG C. The oxygen adsorbent composition for removing or producing oxygen is provided.

In another aspect, the present invention _{La0 .1 Sr 0 .9 Co 0 .2} Fe 0 .8 O 3 -δ ( wherein δ is 0 ≤ δ <in the range of 2), comprising a skyline perop teuhyeong powder represented by the adsorption temperature Is 700 to 900 占 폚. The oxygen adsorbent composition for removing or producing oxygen is provided.

The present invention also relates to a process for producing a perovskite-type powder comprising a perovskite-type powder represented by La _{0 .1} Sr _{0 .9} Co _{0 .9} Fe _{0 .1} O _{3 - δ} wherein δ is in the range of 0 ≦ δ < And the temperature is 700 to 900 占 폚. The oxygen adsorbent composition for removing or producing oxygen is provided.

The oxygen adsorbent of the present invention operates by the principle of selectively adsorbing only oxygen by introducing a perovskite substance and inducing an oxygen deficiency of the oxide at a high temperature. In order to induce oxygen deficiency, various other ions are doped to produce a solid solution oxide, which is used as an oxygen adsorbent. In the case of perovskite metal oxide (ABO ₃ type oxide), A is a metal cation in the alkaline earth metal system (Periodic Table of the Elements 57-71 cation, 1A, 2A series metal) 6, and is electrically neutralized by bonding with three oxygen anions (-6). If the atoms substitute for other A 'and B' atoms instead of A and B, then oxygen ions become insufficient to match the electrical neutrality and thus oxygen vacancy, δ is generated (FIG. 1).

At this time, the entire oxide crystal is electrically stable, but the lattice around the oxygen vacancy is kept electrically + state, so that when the external oxygen partial pressure is increased, oxygen is absorbed into the lattice. The present reversible oxygen production technology removes oxygen by absorbing and then desorbing oxygen using the absorbent having the oxygen vacancy described above (see FIG. 2). The principle of oxygen absorption is theoretically the same as the principle of oxygen permeation of an ion conductive membrane. In the case of an ion conductive membrane, oxygen is permeated into a dense membrane, In the case of the conductive oxide absorbent, oxygen is absorbed only to the surface of the oxide and a part thereof, and oxygen is desorbed by using an oxygen-free sweep gas (steam, hot flue gas, carbon dioxide, etc.) to regenerate the adsorbent.

In this case, the oxygen deficiency changes depending on the solid solution added at a high temperature, and since the oxygen is absorbed into the lattice structure at high temperature by the electric attraction force, the principle of the separation is different from the chemical adsorption through the conventional pore adsorption, physical adsorption and chemical adsorption . In the case of existing adsorbents, adsorption by moisture and carbon dioxide occurs preferentially and thus the efficiency of removing oxygen is low. However, since only oxygen can be adsorbed in the oxygen deficiency site in the lattice of the adsorbent, (Fig. 2).

The oxygen adsorbent having a high temperature adsorptivity of the present invention is La _{1 - x} Sr _x Co _{1 - y} Fe _y O _{3 -} ? _Wherein x is 0? X? 1, y is 0? Y? 1 and? &Lt; 2). &Lt; / RTI &gt; For example, by changing the composition of a transition metal and an alkaline earth metal to induce oxygen deficiency and using the same to provide an oxygen adsorption site. In the case of the above adsorbent, absorption breakdown performance using oxygen and helium was stable at more than 15 times and the adsorption performance was stable. The adsorption performance was 3 ~ 7 ml which is enough to remove 1% oxygen impurity depending on the composition oxygen / g adsorbent. The present invention provides a method for removing oxygen at a high temperature using an adsorbent from air, a mixed gas, and a mixed gas containing oxygen such as LFG. Appropriate separation conditions can be selected according to the composition of the mixed gas in consideration of adsorption characteristics of various compositions according to the present invention at different temperatures.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood by one of ordinary skill in the art that these embodiments are for illustrative purposes only and that the scope of the present invention is not construed as being limited by these examples.

Example  One. Perovskite  brother La _{One - x} Sr _x Co _{One - y} Fe _y O _{3 -δ} Preparation and Characterization of Oxygen Adsorbent

1-1. At high temperature sintering method  Oxygen Adsorbent Manufacturing

The high-temperature firing method is a method in which two or more kinds of metal powder (oxide, nitrate, carbonate, or hydroxide) are mixed and a solid phase diffusion reaction is performed at a temperature below the melting point, Powder. When the non-oxide raw materials are calcined in the air, oxides are formed as nitric acid gas (NOx), carbon dioxide gas (COx), hydrogen (H ₂ ), or water vapor escape, A sequential reaction occurs and the final oxide is synthesized. This solid state reaction requires a relatively high temperature (700 to 1300 ° C) and several hours of reaction conditions. In the present invention as a starting material, _{La 2 O 3 (99.99%,} Aldrich Chemical Co., hereinafter the _{same), SrCO 3 (99.9%)} , Co (NO) 2 · H 2 O (98%), Fe 2 O 3 (99%) were used. These starting materials were weighed according to the molar ratio and then milled and wet mixed using 2-PrOH and zirconia balls for 24 hours. The mixed powders were sequentially dried in a drier maintained at 110 ° C., sieved, heated to 1200 ° C. and maintained for 5 hours to form a single phase. It was found that the crystal system had a cubic perovskite structure (Pm-3m).

1-2. Production of oxygen adsorbent by citric acid method

The citrate method is a method in which citric acid is selected as a chelating agent material to hold various metal constituent ions present in a solution so that perovskite can be formed. As a starting material _{La (NO 3) 3 · 6H} 2 O ( purity of 99.99%, Aldrich, USA), Sr (NO 3) 2 ( purity 99%, Aldrich, USA), Co (NO 3) · 6H 2 O ( purity 98%, Aldrich, USA) and Fe (NO ₃ ) ₃ .9H ₂ O (purity 99%, Aldrich, USA) In the citric acid method, the mass was measured according to the stoichiometry, and then dissolved in distilled water to prepare a total 0.1 M solution. Citric acid (purity: 99.5%, SAMCHUN, Korea ). The mixed solution was reacted at a temperature of 100 ° C. for about 4 hours on a magnetic stirrer, and then a brown gel was obtained by evaporating the water at 80 ° C. The gel-like sample was dried at 110 ° C. for 24 hours, To prepare a precursor. After removal of moisture at 180 ℃, the precursor was decomposed at 250 ~ 450 ℃ and decomposed at 800 ℃ for 2 hours to decompose the carbonate and then sintered at 1300 ℃ for 5 hours to produce perovskite structure oxide.

1-3. In complex conjugation  Oxygen Adsorbent Manufacturing

The polymerized complex method has the advantage that a sample can be obtained with an accurate stoichiometric ratio, and the powder is produced through an esterification reaction. As an initial raw material for the experiments, the mixture prepared _{step, La (NO 3) 3 ·} 6H 2 O ( purity of 99.99%, Aldrich, USA), Sr (NO 3) 2 ( purity 99%, Aldrich, USA), Co _{(NO 3) · 6H 2 O} ( purity 98%, Aldrich, USA), Fe (NO 3) 3 · 9H 2 O ( purity 99%, Aldrich, USA), ethylene glycol (99.5%, DC chemical, KOREA ) and Citric acid (99.5%, SAMCHUN, KOREA) was used. Co and Fe nitrate were added to the ethylene glycol solution on a hot plate at 353K to dissolve to obtain a clear solution, followed by addition of citric acid. At this time, it is preferable to mix citric acid corresponding to 6 times the number of moles of metal ions (La, Sr, Fe and Co) in the metal nitrate solution. After the citric acid was completely dissolved, Sr and La salts were added to the ethylene glycol and citric acid solutions in a molar ratio. Continue mixing on a hot plate at &lt; RTI ID = 0.0 &gt; 130 C &lt; / RTI &gt; In the esterification reaction and pyrolysis step, the temperature of the hot plate was raised to 200 ° C while stirring for 12 hours for the esterification reaction, and the polymer was pyrolyzed at 450 ° C in a mantle heater after condensation. The resulting precursor was then calcined at 800 ° C for 2 hours and then sintered at 1300 ° C for 5 hours to remove residual carbon and impurities in the air.

1-4. Oxygen adsorbent structure and Oxygen adsorption performance analysis

The particle size and specific surface area of the synthesized powders were measured by using a laser particle size analyzer (Fritsch, Analysette 22, Germany), BET (Micrometitics Instrument Co. Model ASAP 2420, USA) and a scanning electron microscope (SEM, Model 1530, LEO Co., Ltd.), and the structure of the synthesized powder was analyzed by X-ray diffractometer (Rigaku Co Model D / Max 2200-Ultimaplus, Japan).

Size La _{0 .6} prepared in the resulting high-temperature firing process was analyzed by the analyzer _{Sr 0 .4 Co 0 .2 Fe 0} .8 O 3 _-δ size of the powder (D50> 80 ㎛) La ₀ is prepared in another wet _{method. 6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 - δ} powder. The smaller the specific surface area, the lower the adsorption surface area. For priming method La ₀ manufactured by polymerization citrate complex method and _{.6 Sr 0 .4 Co 0 .2 Fe} 0 .8 O 3 as compared to the specific surface area and particle size prepared by the polymerization of the complex powder for powder _-δ Of the particles are smaller and the specific surface area is larger (Fig. 3).

Since the citric acid method and the complex conjugation method were more advantageous in the above three methods, SEM, XRD and adsorption performance were examined for the powders prepared by these two methods. _{La 0 .6 Sr 0 .4 Co 0} .2 Fe 0 .8 O 3 -δ shows the XRD, SEM analysis of the powder (4, 5). As can be seen from the XRD, the synthesized powder exhibits a typical perovskite peak and a rhombohedral symmetry structure. It can be seen that the SEM particle size and the particle size analysis result agree well with the particle size (FIGS. 4 and 5).

Other compositions than the La _{0 .6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 - δ} powder were also prepared by the above synthesis method and showed a typical perovskite structure without the formation of the secondary phase.

Example  2. La _{0 .6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 -δ}  Oxygen adsorption characteristics of adsorbents

Oxygen adsorption (oxygen uptake) according to different synthesis methods (citric acid method and complex condensation method) were investigated for powders of La _{0 .6} Sr _{0 .4} Co _{0 .2} Fe _{0 .8} O _{3 - δ} (LSCF) The adsorption / desorption characteristics were compared. The powders used in the experiment were the same as those prepared in the previous section. Oxygen adsorption characteristics of each powder were measured by TGA in the temperature range of 700 ~ 900 ℃. In the case of adsorption, the weight loss change at a certain temperature was analyzed using Thermal Analysis-SDT2960 (TA Instruments, USA) while air was supplied. In the case of desorption, the adsorbent was regenerated using helium. G-Al2O3 was used as a reference material for TGA, and the temperature was maintained at 5 ° C / min. At this time, air and helium were supplied at 100 ml / min, respectively.

6 shows the adsorption / desorption breakdown curves of the powder synthesized by the citric acid method. It can be seen that the adsorption and desorption are reversibly performed well regardless of the temperature, and the adsorption performance is constant even after about 15 times of the adsorption / desorption continuous experiment. 7 shows the adsorption performance of La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O _3-δ powder according to the synthesis method. Oxygen uptake capacity increased with increasing temperature. The maximum temperature of the powder prepared by the citric acid method was about 3.4 ml O ₂ / g sorbent at 900 ℃ and 4.0 ml O ₂ / g sorbent. Therefore, it was found that the adsorption capacity of the LSCF powder prepared by the complex polymerization method was better.

Example 3. Oxygen adsorption characteristics according to parameters of La _{1 - x} Sr _x Co _{1 - y} Fe _y O _{3 - δ} (LSCF) adsorbent

LSCF powders were synthesized by various compositions and oxygen uptake and adsorption / desorption characteristics were compared. The powder was synthesized by citric acid method. In order to simplify the composition of the powder, it is expressed as LSCF-48 in the case of La _0.6 Sr _0.4 Co _0.2 Fe _0.8 O _3-δ with x = 0.4 and y = 0.8 centering on the metal composition of the perovskite oxide (LSCF-xy The same applies to the display). As a result of XRD of the powder prepared by changing the composition, the powder showed a typical perovskite structure (Fig. 8).

As can be seen from the graph of oxygen adsorption / desorption according to the temperature of the powders (FIG. 9), the adsorption / desorption curve showed reversible adsorption / desorption characteristics except for LSCF-28, and the adsorption amount was constant regardless of the number of regeneration . As a result, it was found that the oxygen adsorption amount increased as the temperature increased and was more sensitive to the Sr content change than the Fe content (FIG. 10). That is, when the content of y is changed from LSCF-46 to LSCF-48, the amount of oxygen adsorption is slightly decreased in the whole temperature range but there is little change. On the other hand, when the content of x is increased, Respectively. In the same Sr content condition, the amount of oxygen adsorption increased with decreasing Fe content, and the maximum value of LSCF-46 was about 4.2 ml O ₂ / g sorbent.

Example  4. Sr = 0.9 composition La _{One - x} Sr _x Co _{One - y} Fe _y O _{3 -δ}  ( LSCF ) Oxygen adsorption characteristics of adsorbent

(y = 0.1, 0.5, 0.1, 0.5) after increasing the Sr content to a maximum value of x = 0.9 in the present example, 0.8, 0.9), respectively. Specifically, the XRD analysis results of the compositions of LSCF-91, LSCF-95, LSCF-98 and LSCF-99 were analyzed (FIG. 11).

XRD results show that perovskite structure is shown in LSCF-91 and 98, while LSCF-95 and 99 contain a large amount of impurities. Oxygen adsorption capacity was analyzed for perovskite structures LSCF-91 and 98 except for the perovskite structure, and the results are shown in a graph (FIG. 12). As expected, adsorption performance increased significantly with increasing Sr. The LSCF composition with Sr content of 0.4 showed up to 4.2 ml O ₂ / g sorbent oxygen uptake according to the change of Fe, whereas the composition with Sr content of 0.9 showed up to 6.2 ml O ₂ / g sorbent, and 7.7 ml O ₂ / g sorbent for LSCF-98. It was also found that the adsorption capacity of the powder with an Sr content of 0.9 increases with decreasing temperature, unlike the LSCF powder with an Sr content of 0.4. Therefore, in the case of powder with Sr content of 0.9, the maximum adsorption amount was observed at a temperature of 700 ° C. and the amount of oxygen adsorption decreased with increasing temperature. An increase in the adsorption amount at a low temperature is suitable for the process of producing oxygen, and can be effectively used when it is necessary to remove oxygen in the downstream process.

Also, in the case of the oxygen adsorption amount change according to the change of the y value, the reverse tendency was also shown in Example 3. In the case of LSCF composition with Sr content of 0.4, the amount of oxygen adsorption decreased with increasing amount of Fe, but the adsorption amount of LSCF composition with Sr content of 0.9 was increased with increasing Fe content. This is because the cost of iron is lower than that of cobalt, which is advantageous in that the cost of the adsorbent can be lowered when oxygen is produced in a large scale process. In the case of LSCF-98, it is advantageous to increase the content of Sr. When the content of Sr is 0.9, the amount of oxygen is increased when the content of Fe is high. In the case of LSCF-98, the maximum oxygen adsorption amount is 7.7 ml O ₂ / g sorbent. However, in the case of LSCF-99, the amount of oxygen adsorption was reduced due to the presence of impurities (FIG. 11), and oxygen adsorption characteristics of about 7.3 ml O ₂ / g sorbent were shown (FIG. 12).

Claims (11)

_{La 1 - x Sr x Co 1} - y Fe y O 3 -δ perop represented by the formula (wherein x is 0 ≤ x ≤ 1, y is 0 ≤ y ≤ 1, and δ is in the range of 0 ≤ δ <2) An oxygen adsorbent composition for the removal or production of oxygen comprising a skate-type powder,
When x is 0.4, y decreases in the range of 0? Y? 1, and the oxygen adsorption amount increases as the adsorption temperature increases in the range of 500 to 900 占 폚,
Wherein when x is 0.9, y is reduced in the range of 0? Y? 1 and the oxygen adsorption amount is increased as the adsorption temperature is reduced in the range of 500 to 900 占 폚. The method according to claim 1,
Wherein the adsorption temperature of the composition has a high temperature adsorption temperature of 500 to &lt; RTI ID = 0.0 &gt; 900 C. &lt; / RTI &gt; The method according to claim 1,
Wherein the composition has reversible adsorption / desorption properties. The method according to claim 1,
Wherein the oxygen adsorption amount is increased as x increases in the range of 0 &lt; = x &lt; = 1. The method according to claim 1,
Wherein the composition is prepared by a citric acid method or a complex polymerization method. The method according to claim 1,
Wherein the composition is a rhombohedral structure. The method according to claim 1,
Wherein the oxygen production is for producing high purity oxygen in a pure oxygen combustion process. The method according to claim 1,
Wherein the removal of the oxygen is to remove trace amounts of oxygen in the syngas or landfill gas. La _{0 .6} Sr _{0 .4} Co _{0 .4} Fe _{0 .6} O _{3 - δ} wherein δ is in the range of 0 ≦ δ <2, and the adsorption temperature is 900 ° C. &Lt; / RTI &gt; oxygen adsorbent composition for the removal or production of oxygen. La _{0 .1} Sr _{0 .9} Co _{0 .2} Fe _{0 .8} O _{3 - δ} wherein δ is in the range of 0 ≦ δ <2, and the adsorption temperature is in the range of 700 - Lt; RTI ID = 0.0 &gt; 900 C. &lt; / RTI &gt; La _{0 .1} Sr _{0 .9} Co _{0 .9} Fe _{0 .1} O _{3 - δ} wherein δ is in the range of 0 ≦ δ <2, and the adsorption temperature is in the range of 700 - Lt; RTI ID = 0.0 &gt; 900 C. &lt; / RTI &gt;

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