CN105169900A - Oxynitride decomposition method and device - Google Patents

Oxynitride decomposition method and device Download PDF

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Publication number
CN105169900A
CN105169900A CN201410239686.XA CN201410239686A CN105169900A CN 105169900 A CN105169900 A CN 105169900A CN 201410239686 A CN201410239686 A CN 201410239686A CN 105169900 A CN105169900 A CN 105169900A
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Prior art keywords
electric current
electrode
oxide
nitrogen oxides
decompose
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王世忠
黄群健
杨海
张华�
安德鲁·沙皮罗
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General Electric Co
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General Electric Co
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Priority to CN201410239686.XA priority Critical patent/CN105169900A/en
Priority to DE102015107770.1A priority patent/DE102015107770A1/en
Priority to JP2015103294A priority patent/JP2015226903A/en
Priority to CH00710/15A priority patent/CH709638A2/en
Priority to US14/725,727 priority patent/US20150345035A1/en
Publication of CN105169900A publication Critical patent/CN105169900A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/17—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof
    • C25B9/19—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms
    • C25B9/23—Cells comprising dimensionally-stable non-movable electrodes; Assemblies of constructional parts thereof with diaphragms comprising ion-exchange membranes in or on which electrode material is embedded
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B9/00—Cells or assemblies of cells; Constructional parts of cells; Assemblies of constructional parts, e.g. electrode-diaphragm assemblies; Process-related cell features
    • C25B9/60—Constructional parts of cells
    • C25B9/65—Means for supplying current; Electrode connections; Electric inter-cell connections
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Abstract

An oxynitride decomposition method includes that an oxynitride-containing air flow makes contact with a device; the device includes a first electrode, a second electrode opposite to the first electrode, an electrolyte located between the first electrode and the second electrode, and a power supply; the power supply intermittently provides current for decomposing oxynitrides. The invention also relates to the corresponding device.

Description

Decompose nitrogen oxides method and apparatus
Technical field
The present invention relates to the method for decomposing nitrogen oxide and device.
Background technology
Nitrogen oxide (NOx comprises nitric oxide and/or nitrogen dioxide) is unwanted composition in environment, and is that needs are controlled.Certain methods has been devised for decompose nitrogen oxides is become nitrogen and oxygen.But certain methods needs to use dangerous compound such as ammoniacal liquor, and/or causes secondary pollution such as to produce ammonium sulfate, and complicated and expensive.The electric power resource that other method consumption are a large amount of.
So, although aforementioned certain methods is in the industry cycle applied, still need to provide method and the device of new decomposing nitrogen oxide.
Summary of the invention
The object of this invention is to provide a kind of new decompose nitrogen oxides method and apparatus.
On the one hand, embodiments of the invention relate to a kind of decompose nitrogen oxides method, and it comprises: contacted with equipment by the air-flow of nitrogen-containing oxide, described equipment comprises: the first electrode, second electrode on the other side, the electrolyte between first, second electrode, and power supply; And, provide electric current with decomposing nitrogen oxide from described power supply to described first and second electrode intervals.
On the other hand, embodiments of the invention relate to decompose nitrogen oxides device, and it comprises source of the gas, for providing the air-flow containing nitrogen oxide; And equipment, itself and source of the gas fluid communication also comprise: the first electrode, the second electrode on the other side, first, second interelectrode electrolyte, and for providing electric current with the power supply of decomposing nitrogen oxide to first, second electrode interval.
Accompanying drawing explanation
With reference to accompanying drawing reading detailed description below, can help to understand feature of the present invention, aspect and advantage, wherein:
Fig. 1 is the generalized section of the device according to some embodiments of the present invention.
Fig. 2 is the generalized section of the device according to other embodiments of the present invention.
Fig. 3 is the generalized section of the device according to some embodiments more of the present invention.
Fig. 4 is the generalized section of the device according to other embodiment of the present invention.
Figure 5 shows that there is La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xthe reactor of cathode layer, at 600 DEG C, applies and stops under 50 milliamperes of current condition the conversion percentages under nitric oxide different time in air-flow (80 ml/min, containing the nitric oxide production helium of 400ppm).
Figure 6 shows that respectively there is NiO-Zr 0.89sc 0.1ce 0.01o 2-xcathode layer and La0 .6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xthe reactor of cathode layer before 600 DEG C apply 50 milliamperes of electric currents and stop electric current after 5 hours to air-flow (80 ml/min, containing the nitric oxide production helium of 400ppm) in nitric oxide production conversion percentages.
Detailed description of the invention
Define separately except clear in non-invention, the implication that the implication of the Science and Technology term used is understood usually for those skilled in the art." first ", " second " that use in the present invention and similar word do not represent any order, quantity or importance, and are only used to be distinguished from each other." comprising ", " comprising ", " having " or " containing " of using in the present invention and similar word refer to that other project also can within scope except listing in project thereafter and equivalent thereof.
Approximate term in the present invention is used for modifying quantity, represents that the present invention is not limited to described concrete quantity, also comprises close to described quantity, acceptable, can not to cause the correction of the change of relevant basic function part.Accordingly, modify a numerical value with " approximately ", " about " etc., mean and the invention is not restricted to described exact numerical.In certain embodiments, approximate term may correspond to the precision of the instrument measuring numerical value.Number range in the present invention can merge and/or exchange, unless clearly demonstrated separately, number range comprises its all numerical value subranges contained.
In the specification and in the claims, unless clearly pointed out in addition, single plural number of all items is not limited.Unless the context clearly dictates otherwise, term "or", " or " and do not mean that exclusive, and refer to existence mentions in project (such as composition) at least one, and the situation that the combination comprising the project of mentioning can exist.
Mention in description of the present invention " some embodiments " etc., represent that described a kind of specific factor related to the present invention (such as feature, structure and/or feature) is comprised at least one embodiment described in this description, may maybe can not come across in other embodiments.In addition, it is to be appreciated that described invention key element can combine in any suitable manner.
Embodiments of the invention relate to the method and apparatus of decomposing nitrogen oxide.
The present invention's alleged " nitrogen oxide " or similar term refer in molecule the gas comprising nitrogen and oxygen, such as nitric oxide, nitrogen dioxide or its combination.
Please refer to the drawing 1,2,3 and 4, comprises the air-flow 12,22 for providing package nitrogen-containing oxide according to the decompose nitrogen oxides device 10,20,30,40 of the embodiment of the present invention, the source of the gas 11,21,31,41 of 32,42, and with described source of the gas 11,21,31, the equipment 100,200,300,400 of 41 fluid communication.
The air-flow comprising nitrogen oxide can from various source of the gas.In some embodiments, described source of the gas is from gas turbine, the waste gas of internal combustion engine or burner.In some embodiments, source of the gas comprises pipeline, channel or the passage that air-flow passes through.
In some embodiments, equipment 100,200,300,400 comprise the first electrode 101,201,301,401, second electrode 102,202,302 on the other side, 402, first, second interelectrode electrolyte 103,203,303,403, and for providing electric current with the power supply 104 of decomposing nitrogen oxide to first, second electrode interval, 204,304,404.In some embodiments, described power supply 104,204,304,404 comprises the controller 114,214,314,414 for controlling described electric current.
In some embodiments, before electric current applies, nitrogen oxide can at equipment 100, and 200,300,400 Direct Resolution.When the air-flow containing nitrogen oxide contacts with equipment, nitric oxide in the reaction of negative electrode as NO=1/2N 2+ 1/2O 2.
But as shown in aftermentioned experimental example, after applying electric current, except above-mentioned nitric oxide production Direct Resolution, nitrogen oxide also can decompose with aftermentioned electrochemical reaction in the cathode: NO+2e → 1/2N 2+ O 2-.Consequent oxonium ion enters anode to be oxidized to oxygen from negative electrode through electrolyte: O 2--2 e→ 1/2O 2.Overall reaction in described equipment is: NO=1/2N 2+ 1/2O 2.Nitrogen oxide Direct Resolution rate is improved, and, after electric current stops in the long period, the conversion ratio of the nitrogen oxide before the conversion ratio of nitrogen oxide applies higher than electric current.
Therefore, provide electric current by interval, the conversion ratio of decompose nitrogen oxides is higher than the conversion ratio of nitrogen oxide not applying electric current, and the energy ezpenditure needed for decompose nitrogen oxides is lower than the energy consumption being continuously applied electric current.
The decomposition of nitrogen oxide can be carried out in any suitable temperature.In some embodiments, interval provides temperature range during electric current at about 300 degrees Celsius to about 1000 degrees Celsius.
In the present invention, " interval provide electric current " refers to intermittent applying and removes electric current, with to be continuously applied electric current during decomposing nitrogen oxide contrary.Interval provides the mode that to apply and remove electric current during electric current respectively and time to can be depending on concrete device, air-flow Sum decomposition environment, as long as the conversion ratio of nitrogen oxide and energy ezpenditure can meet the requirement of embody rule.
In some embodiments, the applying of electric current during electric current is intermittently provided and removes and hocket.In some embodiments, the time that when interval provides electric current, electric current applies is different from the time that electric current stops.In some embodiments, the time that when interval provides electric current, electric current applies is identical with the time that electric current stops.
The conversion ratio that electric current can be any decomposing nitrogen oxide is higher than the electric current of conversion ratio not adding electric current.In some embodiments, electric current is direct current.In some embodiments, when electric current applies, electric current leaps to design load.In some embodiments, when electric current applies, electric current slowly arrives design load.
Described controller 114,214,314,414 can be the mechanism of any control current switch and/or lifting.In some embodiments, described controller is the switch of switching current.
In some embodiments, described first electrode 101,201,301,401 is anode.Anode can comprise any material oxonium ion being oxidized to oxygen, and other any anode materials.In some embodiments, anode contains the oxide of manganese, such as lanthanum-strontium-manganese oxide, as (La 0.8sr 0.2) 0.95mnO 3; The zirconic combination of platinum and stabilized with yttrium oxide; The combination of platinum and gadolinium doped-ceria; Or any combination of aforementioned substances.
In some embodiments, described second electrode 102,202,302,402 is negative electrode.Negative electrode can comprise the material that any decomposing nitrogen oxide is nitrogen and oxonium ion, and other any cathode materials.
In some embodiments, negative electrode comprises the catalyst of the decomposition of catalyst nox.In some embodiments, negative electrode comprises the catalyst not affecting by oxygen or affect very little catalyst nox decomposition by oxygen.The oxygen coexisted with nitrogen oxide can discharge from negative electrode.
In some embodiments, negative electrode comprises the sorbing material of nitric oxide adsorption.The example of sorbing material includes but not limited to magnesia, calcium oxide, sodium oxide molybdena, potassium oxide, barium monoxide and strontium oxide strontia.
In some embodiments, negative electrode comprises the oxide of manganese, and such as lanthanum strontium Ni, Mn oxide is (as La 0.6sr 0.4ni 0.3mn 0.7o 3); Nickel oxide; Lanthanum strontium Ni, Mn oxide and gadolinium doped-ceria are (as Gd 0.1ce 0.9o 1.95) combination; Lanthanum strontium Ni, Mn oxide and scandium stabilizing zirconia are (as Zr 0.89sc 0.1ce 0.01o 2-x) combination of (ratio as 50 percent percentage by weight); The combination (such as weight percent is: 40 percent, 30 30 percent and percent) of nickel oxide, lanthanum strontium Ni, Mn oxide and scandium stabilizing zirconia; The combination (example ratio: respectively account for percentage by weight 50) of nickel oxide and scandium stabilizing zirconia; The zirconic combination of platinum and stabilized with yttrium oxide; The combination of platinum and gadolinium doped-ceria; Or any combination of aforementioned substances.
In some embodiments, as shown in Figures 3 and 4, described equipment 30,40 comprises and is directly or indirectly positioned at described second electrode 302, and the adsorption layer 305,405 on 402, has other materials therebetween time indirect.Adsorption layer can comprise the sorbing material of any nitric oxide adsorption, the sorbing material such as described above.Sorbing material may be interspersed within negative electrode and does not form an independent layer.
In some embodiments, described device comprises collector (not shown).Collector can be obtained by any conductive material, such as metal or metal alloy.Collector can be and anyly to provide or the structure of collected current from electrode.In some embodiments, collector is prepared by nickel.In some embodiments, collector is the combination of porous web, perforated membrane, foam or aforementioned forms.In some embodiments, collector is nickel foam.In some embodiments, a kind of porosity of porous metals collector is 99 25 about percent to about percent.
In some embodiments, collector is the mechanical support of first, second electrode.
In some embodiments, described equipment comprises the collector be directly or indirectly positioned on the second electrode, has other materials time indirect between collector and the second electrode.
Described electrolyte can comprise any material or other materials be applicable to oxygen-ion conductive.In certain embodiments, described electrolyte comprises gadolinium doped-ceria (as Gd 0.1ce 0.9o 1.95); Scandium stabilizing zirconia is (as Zr 0.89sc 0.1ce 0.01o 2-x); From the oxide of barium-zirconium-cerium-yttrium family (as BaZr 0.7ce 0.2y 0.1o 3); Or any combination of aforementioned substances.In certain embodiments, described electrolyte comprises bismuth oxide, zeolite, aluminium oxide, silica, aluminium nitride, carborundum, nickel oxide, iron oxide, cupric oxide, calcium oxide, magnesia, zinc oxide, aluminium, yttrium stable zirconium oxide, scandium stabilizing zirconia, calcium titanium oxide, lanthanum strontium calcium manganese, lanthanum silicate, Nd 9.33(SiO 4) 6o 2, AlPO 4, B 2o 3, R 2o (R represents a kind of alkali metal), AlPO 4-B 2o 3-R 2the SiO of O glass (its main composition is sodium and adds potassium), porous 2-P 2o 5system glass, yttrium add BaZrO 3, yttrium adds SrZrO 3and yttrium adds SrTiO 3, strontium doping lanthanum manganite, lanthanum strontium cobalt iron oxide (lanthanum-strontium-cobalt-iron system perofskite type oxide), La-Sr-Mn-Fe system perofskite type oxide, Ba-Sr-Mn-Fe system perofskite type oxide or any aforementioned substances combination.
A fine and close electrolytic condenser is comparatively applicable to the gas and vapor permeation stoping described negative electrode and anode, and reduces described electrolytical resistance.Low resistance is conducive to saving energy in reduction of nitrogen oxide process.
Each in described electrode, electrolyte, collector and adsorption layer can be a simple layer or comprises multiple layer, depends on the needs of intensity, gas diffusibility and porosity.Multiple layer each other can be identical or different, and connect in an appropriate manner.In each simple layer, its composition is identical or different at least one dimension.
Described equipment can be any structure being suitable for decomposing nitrogen oxide.In some embodiments, as shown in figs. 1 and 3, equipment 100,300 is slabbed construction.In some embodiments, as shown in Figures 2 and 4, equipment 200,400 for inside have living space 206,406 tubular structure.
Equipment involved in the present invention can be prepared by aftermentioned method: provide a collector and apply other different layers in its both sides order, or provides other random layers and at its any one or both sides lamination different layers.These layers are formed/applying/lamination by the mode of any appropriate, such as by extruding, dip coating, spraying and printing.
Experimental example
Following experimental example can be implemented for the people in this area with general technical ability to the invention provides reference.These examples do not limit the scope of the claims.
Example 1La 0.6sr 0.4ni 0.3mn 0.7o 3synthesis
By La 2o 3, SrCO 3, Mn (AC) 24H 2o and NiO ball milling prepare La in 8 hours at 1300 DEG C of sintering in ethanol 0.6sr 0.4ni 0.3mn 0.7o 3.X-ray diffraction (XRD) result shows, the La of synthesis 0.6sr 0.4ni 0.3mn 0.7o 3material has pure phase.
Prepared by example 2 reactor
Extrusion molding is utilized to prepare (the La of two 7.5 centimeter length, one end open 0.8sr 0.2) 0.95mnO 3pipe.The external diameter of pipe is 1 centimetre, and internal diameter is 0.7 centimetre.
By with (La 0.8sr 0.2) 0.95mnO 3pipe, at 1250 DEG C of co-sinterings, prepares fine and close Zr at pipe outer wall 0.89sc 0.1ce 0.01o 2-xdielectric film.
At Zr 0.89sc 0.1ce 0.01o 2-xelectrolyte forms La respectively 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-x(50wt% ratio) layer and NiO-Zr 0.89sc 0.1ce 0.01o 2-x(50wt% ratio) layer, and obtain two reactors at 900-1100 DEG C of sintering.La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xlayer and NiO-Zr 0.89sc 0.1ce 0.01o 2-xthe active catalytic surface of layer is long-pending is respectively 10cm 2.
At La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xlayer and NiO-Zr 0.89sc 0.1ce 0.01o 2-xlayer is coated with further the platinum pulp layer of porous as porous metals collector.
Analyze the microstructure of reactor.Scanning electron microscope analysis shows, example (La 0.8sr 0.2) 0.95mnO 3/ Zr 0.89sc 0.1ce 0.01o 2-x/ NiO-Zr 0.89sc 0.1ce 0.01o 2-xthree-decker can be observed, (La in the cross section of reactor tube 0.8sr 0.2) 0.95mnO 3layer has the loose structure of low porosity, Zr 0.89sc 0.1ce 0.01o 2-xlayer has compact texture, NiO-Zr 0.89sc 0.1ce 0.01o 2-xlayer has the loose structure of high porosity.
Example 3 decompose nitrogen oxides
Each reactor is placed in an alumina tube.The internal diameter of alumina tube is 2 centimetres.Air-flow (80ml/min contains the helium of 400ppmNO) enters in alumina tube, and by the outer surface of reactor.The temperature of reactor is 600 DEG C.50mA DC current puts on each reactor, stops electric current after 900 minutes.
La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xlayer and NiO-Zr 0.89sc 0.1ce 0.01o 2-xlayer is respectively negative electrode, and Direct Resolution reaction and the electrochemical reducting reaction of NO occur.(La 0.8sr 0.2) 0.95mnO 3layer is anode, and the oxidation reaction of oxonium ion occurs.Voltage between corresponding anode and cathode is 1-1.5V.The gas-chromatography of being furnished with PQ chromatographic column and RAE7800 detector is used to detect NO and NO 2, precision is respectively 1ppm and 0.1ppm.
Fig. 5 display has La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xthe reactor of cathode layer slowly rose to about 40% from about 5% in the conversion percentages of the NO of 600 DEG C 900 minutes of applying 50 milliamperes of DC currents.Before applying electric current, the conversion ratio of nitrogen oxide 5% is the direct catalytic decomposition of nitrogen oxide in reactor.After electric current stops, through 300 minutes, nitric oxide production conversion ratio slowly dropped to about 20%, higher than applying 5% before electric current.This shows that direct current have activated the ability of reactor decomposing nitrogen oxide.Therefore, this experiment shows compared to not applying electric current, alternately applies and the interval that stops provides the conversion ratio decomposing nitrogen oxide that electric current can be higher.
Figure 6 shows that there is NiO-Zr 0.89sc 0.1ce 0.01o 2-xcathode layer and La 0.6sr 0.4ni 0.3mn 0.7o 3-Zr 0.89sc 0.1ce 0.01o 2-xthe conversion ratio of the NO after the reactor of cathode layer stops 5 hours with 50mA electric current before electric current applies.After electric current stops, high a lot of conversion of nitric oxide gas rate before two reactors all show and apply than electric current.Nitric oxide high conversion after electric current stops is the reduction of nickel and La in nickel oxide when may apply with electric current 0.6sr 0.4ni 0.3mn 0.7o 3middle nickel is relevant with the reduction of manganese, because it can produce Lacking oxygen.These rooms can be the lateral reactivity center of nitrogen oxide absorbent Sum decomposition.This experiment shows compared to being continuously applied electric current further, alternately applies and stops the interval of electric current to provide electric current can consume less energy under higher transformation efficiency of the oxides of nitrogen.
Although show invention has been in conjunction with the specific embodiments, those skilled in the art will appreciate that and can make many amendments and modification to the present invention.Therefore, recognize, the intention of claims is to cover all such modifications in true spirit of the present invention and scope and modification.

Claims (10)

1. a decompose nitrogen oxides method, it comprises:
Contacted with equipment by the air-flow of nitrogen-containing oxide, described equipment comprises: the first electrode, the second electrode on the other side, the electrolyte between first, second electrode, and power supply; And,
There is provided electric current with decomposing nitrogen oxide from described power supply to described first and second electrode intervals.
2. decompose nitrogen oxides method as claimed in claim 1, is characterized in that interval provides temperature range during electric current to be from 300 degrees Celsius to 1000 degrees Celsius.
3. decompose nitrogen oxides method as claimed in claim 1, the time that when it is characterized in that intermittently providing electric current, electric current applies is different from the time that electric current stops.
4. decompose nitrogen oxides method as claimed in claim 1, the time that when it is characterized in that intermittently providing electric current, electric current applies is identical with the time that electric current stops.
5. decompose nitrogen oxides method as claimed in claim 1, is characterized in that described electric current is direct current.
6. a decompose nitrogen oxides device, it comprises:
Source of the gas, for providing the air-flow containing nitrogen oxide; And
Equipment, itself and source of the gas fluid communication also comprise: the first electrode, the second electrode on the other side, first, second interelectrode electrolyte, and for providing electric current with the power supply of decomposing nitrogen oxide to first, second electrode interval.
7. decompose nitrogen oxides device as claimed in claim 6, it is characterized in that described first electrode is anode, described second electrode is negative electrode.
8. decompose nitrogen oxides device as claimed in claim 6, is characterized in that described power supply comprises the controller for controlling described electric current.
9. decompose nitrogen oxides device as claimed in claim 6, is characterized in that described source of the gas is waste gas.
10. decompose nitrogen oxides device as claimed in claim 6, is characterized in that described equipment comprises collector.
CN201410239686.XA 2014-05-30 2014-05-30 Oxynitride decomposition method and device Pending CN105169900A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201410239686.XA CN105169900A (en) 2014-05-30 2014-05-30 Oxynitride decomposition method and device
DE102015107770.1A DE102015107770A1 (en) 2014-05-30 2015-05-18 Process and apparatus for the decomposition of nitrogen oxide
JP2015103294A JP2015226903A (en) 2014-05-30 2015-05-21 Method and apparatus for decomposing nitrogen oxide
CH00710/15A CH709638A2 (en) 2014-05-30 2015-05-21 Method and apparatus for the decomposition of nitrous oxide.
US14/725,727 US20150345035A1 (en) 2014-05-30 2015-05-29 Method and apparatus for decomposing nitrogen oxide

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Application Number Priority Date Filing Date Title
CN201410239686.XA CN105169900A (en) 2014-05-30 2014-05-30 Oxynitride decomposition method and device

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CN105169900A true CN105169900A (en) 2015-12-23

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