WO2017171419A1 - 질소산화물 농도 측정 및 암모니아 슬립 감지 센서 - Google Patents
질소산화물 농도 측정 및 암모니아 슬립 감지 센서 Download PDFInfo
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- WO2017171419A1 WO2017171419A1 PCT/KR2017/003461 KR2017003461W WO2017171419A1 WO 2017171419 A1 WO2017171419 A1 WO 2017171419A1 KR 2017003461 W KR2017003461 W KR 2017003461W WO 2017171419 A1 WO2017171419 A1 WO 2017171419A1
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- Prior art keywords
- electrode
- solid electrolyte
- ammonia
- nitrogen oxide
- detection sensor
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 459
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 414
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 205
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 214
- 238000005259 measurement Methods 0.000 claims abstract description 109
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 23
- 239000001301 oxygen Substances 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims description 72
- 239000003054 catalyst Substances 0.000 claims description 60
- 230000003647 oxidation Effects 0.000 claims description 58
- 238000007254 oxidation reaction Methods 0.000 claims description 58
- 238000000034 method Methods 0.000 claims description 20
- -1 oxygen ion Chemical class 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 239000007772 electrode material Substances 0.000 claims description 10
- 229910052697 platinum Inorganic materials 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 6
- 229910000510 noble metal Inorganic materials 0.000 claims description 6
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 229910052741 iridium Inorganic materials 0.000 claims description 4
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 229910020599 Co 3 O 4 Inorganic materials 0.000 claims description 3
- 229910018657 Mn—Al Inorganic materials 0.000 claims description 3
- 229910003310 Ni-Al Inorganic materials 0.000 claims description 3
- 238000005342 ion exchange Methods 0.000 claims description 3
- 229910052703 rhodium Inorganic materials 0.000 claims description 3
- 239000010457 zeolite Substances 0.000 claims description 3
- 229910021536 Zeolite Inorganic materials 0.000 claims description 2
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 36
- 238000010438 heat treatment Methods 0.000 abstract description 13
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 abstract description 8
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 abstract description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 5
- 238000009434 installation Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010531 catalytic reduction reaction Methods 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- KDLHZDBZIXYQEI-UHFFFAOYSA-N palladium Substances [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 4
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 239000010931 gold Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 229910002089 NOx Inorganic materials 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000010349 cathodic reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- LZDSILRDTDCIQT-UHFFFAOYSA-N dinitrogen trioxide Chemical compound [O-][N+](=O)N=O LZDSILRDTDCIQT-UHFFFAOYSA-N 0.000 description 2
- 239000002003 electrode paste Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000010948 rhodium Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 2
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001272 nitrous oxide Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
- G01N27/327—Biochemical electrodes, e.g. electrical or mechanical details for in vitro measurements
- G01N27/3275—Sensing specific biomolecules, e.g. nucleic acid strands, based on an electrode surface reaction
- G01N27/3277—Sensing specific biomolecules, e.g. nucleic acid strands, based on an electrode surface reaction being a redox reaction, e.g. detection by cyclic voltammetry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
- G01N25/28—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly
- G01N25/30—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements
- G01N25/32—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the rise in temperature of the gases resulting from combustion being measured directly using electric temperature-responsive elements using thermoelectric elements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/403—Cells and electrode assemblies
- G01N27/406—Cells and probes with solid electrolytes
- G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
- G01N27/4073—Composition or fabrication of the solid electrolyte
- G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4162—Systems investigating the composition of gases, by the influence exerted on ionic conductivity in a liquid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0031—General constructional details of gas analysers, e.g. portable test equipment concerning the detector comprising two or more sensors, e.g. a sensor array
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0037—NOx
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/0054—Ammonia
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Definitions
- the present invention relates to a gas sensor, and more particularly to a gas sensor capable of detecting ammonia slip as well as measuring the concentration of nitrogen oxides.
- Nitrogen oxides are produced by combining nitrogen in air and fuel with oxygen, and include nitrogen monoxide (NO), nitrogen dioxide (NO 2 ), dinitrogen trioxide (N 2 O 3 ), and nitrous oxide (N 2 O). , Denoted as NOx. Nitrogen monoxide and nitrogen dioxide make up most of the nitrogen oxide gas, and they serve as air pollutants. Therefore, it is necessary to control the emission level by measuring the concentration.
- the selective catalytic reduction system includes a diesel oxidation catalyst (1), a smoke reduction device (2), a urea water injection device (3), and a hydrolysis device for removing harmful substances contained in exhaust gas. (4), selective reduction catalyst (5), and ammonia oxidation catalyst (6).
- the urea water injection device 3 injects an appropriate amount of urea water into the exhaust gas based on the measured value received by the nitrogen oxide sensor 7. Insufficient injection of urea lowers the conversion efficiency of NOx. Injecting too much urea releases ammonia into the atmosphere. In a selective catalytic reduction system, this release of ammonia into the atmosphere without being completely consumed in the catalytic reaction is called "ammonia slip".
- the nitrogen oxide sensor 8 at the rear of the system measures the nitrogen oxide concentration emitted in order to check whether the selective reduction system is degraded or malfunctioning.
- the ammonia sensor 9 detects whether the above-described ammonia slip is generated.
- the present invention is to improve the above-described problems, it is an object of the present invention to provide a new gas sensor that can not only accurately measure the concentration of nitrogen oxide, but also can detect the slip of ammonia.
- the present invention provides an oxygen ion conductive solid electrolyte, a first electrode in contact with the solid electrolyte, reactive with nitrogen oxides, in contact with the solid electrolyte, separated from the first electrode, and nitrogen
- a second electrode reactive with oxide a third electrode in contact with the solid electrolyte, separated from the second electrode, connected in parallel with the first electrode, reactive with ammonia, and the first electrode connected in parallel
- a power supply device configured to apply an electric power between the electrode and the third electrode and the second electrode, and a measurement device configured to measure a potential difference or current between the first electrode and the third electrode and the second electrode connected in parallel; It provides nitrogen oxide concentration measurement and ammonia slip detection sensor.
- the solid electrolyte is plate-like, provides a nitrogen oxide concentration measurement and ammonia slip detection sensor having the first electrode, the second electrode and the third electrode formed on one side of the solid electrolyte.
- the solid electrolyte is plate-like, the nitrogen oxide having the first electrode and the third electrode formed on one side of the solid electrolyte, the second electrode formed on the other side facing the one side of the solid electrolyte It provides concentration measurement and ammonia slip detection sensor.
- the present invention provides a nitrogen oxide concentration measurement and ammonia slip detection sensor further comprising an ammonia oxidation catalyst layer formed in a path through which ammonia flows toward the third electrode.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor formed on the surface of the solid electrolyte.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising at least one material selected from Pt, Pd, Rh, Ir, Ru, Ag.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising a porous ceramic in which the noble metal is dispersed.
- ammonia oxidation catalyst layer is Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Fe-Al 2 O 3 , Mn-Al 2 O 3 , CuO-Al 2 O 3 , Fe 2 O 3 -Al 2 O 3 , Fe 2 O 3 -TiO 2 , Fe 2 O 3 -ZrO 2 It provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising at least one material selected from among.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising an ion exchange zeolite.
- the third electrode provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising at least one material selected from the group consisting of ZnO, SnO 2 and In 2 O 3 .
- the present invention provides an oxygen ion conductive solid electrolyte, a second electrode in contact with the solid electrolyte, reactive with nitrogen oxides, in contact with the solid electrolyte, and separated from the second electrode.
- a fourth electrode comprising a first electrode layer reactive with nitrogen oxides and a third electrode layer reactive with ammonia, a power supply configured to apply power between the second electrode and the fourth electrode; It provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising a measuring device configured to measure the potential difference or current between the second electrode and the fourth electrode.
- the solid electrolyte is plate-like, it provides a nitrogen oxide concentration measurement and ammonia slip detection sensor formed with the second electrode and the fourth electrode on one side of the solid electrolyte.
- the solid electrolyte is plate-shaped, the second electrode is formed on one side of the solid electrolyte, the nitrogen oxide concentration measurement and the ammonia slip in which the fourth electrode is formed on the other side opposite to the one side of the solid electrolyte.
- a sensing sensor Provide a sensing sensor.
- the present invention provides a nitrogen oxide concentration measurement and ammonia slip detection sensor further comprising an ammonia oxidation catalyst layer formed in a path through which ammonia flows toward the fourth electrode.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor formed on the surface of the solid electrolyte.
- the present invention provides an oxygen ion conductive solid electrolyte, a second electrode in contact with the solid electrolyte, reactive with nitrogen oxides, in contact with the solid electrolyte, and separated from the second electrode.
- a fifth electrode comprising a first electrode material reactive to nitrogen oxides and a third electrode material reactive to ammonia, a power supply configured to apply power between the second electrode and the fifth electrode; It provides a nitrogen oxide concentration measurement and ammonia slip detection sensor comprising a measuring device configured to measure the potential difference or current between the second electrode and the fifth electrode.
- the solid electrolyte is plate-like, provides a nitrogen oxide concentration measurement and ammonia slip detection sensor formed with the second electrode and the fifth electrode on one side of the solid electrolyte.
- the solid electrolyte is plate-like, the second electrode is formed on one side of the solid electrolyte, the nitrogen oxide concentration measurement and the ammonia slip formed on the other side opposite to the one side of the solid electrolyte Provide a sensing sensor.
- the present invention provides a nitrogen oxide concentration measurement and ammonia slip detection sensor further comprising an ammonia oxidation catalyst layer formed in a path through which ammonia flows toward the fifth electrode.
- ammonia oxidation catalyst layer provides a nitrogen oxide concentration measurement and ammonia slip detection sensor formed on the surface of the solid electrolyte.
- the solid electrolyte is plate-like, and has a plate-like support in contact with the solid electrolyte, the support is nitrogen oxide concentration measurement and ammonia slip detection sensor provided on one side or the other side of the solid electrolyte facing the one side To provide.
- the solid electrolyte provides a porous nitrogen oxide concentration measurement and ammonia slip detection sensor.
- Nitrogen oxide concentration measurement and ammonia slip detection sensor can measure the sum of the concentration of nitrogen monoxide and nitrogen dioxide. In addition, the ammonia can be measured at the same time.
- the manufacturing cost is reduced because the nitrogen oxide sensor and the ammonia sensor share some electrodes, a solid electrolyte, and a heating part. In addition, since the nitrogen oxide sensor and the ammonia sensor need not be installed separately, the installation cost is also reduced.
- Some embodiments of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention are directed to a first electrode reactive to nitrogen oxide, a second electrode reactive to nitrogen oxide and ammonia on one side of the plate-shaped solid electrolyte. Since a third electrode having a reactivity is formed, the nitrogen oxide and ammonia contained in the measurement target gas are reactive with the nitrogen oxide only by exposing one side of the solid electrolyte to the measurement target gas such as exhaust gas. It is possible to detect simultaneously from an electrode and an electrode reactive to ammonia. Therefore, it is possible to accurately and quickly detect the concentration of nitrogen oxide and the ammonia slip contained in the gas to be measured.
- Some embodiments of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention include, on one side of the solid electrolyte, a second electrode reactive with nitrogen oxide and a first electrode layer reactive with nitrogen oxide and ammonia. 3rd reactive to A fourth electrode including the electrode layer is formed.
- a fifth electrode including a second electrode reactive with nitrogen oxides and a first electrode substance reactive with nitrogen oxides and a third electrode substance reactive with ammonia is formed. It is. Therefore, by exposing one side of the solid electrolyte to a measurement gas such as exhaust gas, it is possible to simultaneously detect nitrogen oxide and ammonia contained in the gas to be measured by an electrode which is reactive to each of the components of nitrogen oxide and ammonia. It is possible. Therefore, it is possible to accurately and quickly detect the concentration of nitrogen oxide and the ammonia slip contained in the measurement target gas.
- a first electrode reactive with nitrogen oxide and a third electrode reactive with ammonia are formed on one side of the plate-shaped solid electrolyte.
- a second electrode reactive with nitrogen oxide is formed on the other side.
- a second electrode reactive with nitrogen oxides is formed on one side of the solid electrolyte, and on the other side, a first electrode layer reactive with nitrogen oxides and a third electrode layer reactive with ammonia are included.
- the fourth electrode is formed.
- a second electrode reactive with nitrogen oxides is formed on one side of the solid electrolyte, and a first electrode substance reactive with nitrogen oxides and a third electrode substance reactive with ammonia on the other side of the solid electrolyte.
- a fifth electrode including the is formed.
- the plate-like support in contact with the plate-like solid electrolyte is provided on one side or the other side of the solid electrolyte
- the solid by the support It is possible to support the electrolyte.
- the support is provided on one side or the other side of the solid electrolyte in which the electrode is formed, so that the electrode is disposed between the solid electrolyte and the support. .
- the nitrogen oxide concentration measurement and the ammonia slip detection sensor according to the present invention are provided, it is possible to suppress the measurement gas from colliding with the electrode, so that the electrode degradation due to the collision of the measurement gas is suppressed. , The durability of the sensor is improved.
- the level of reactivity with the measurement target gas of the electrode formed on one side of the solid electrolyte and that of the electrode formed on the other side are different, one side of the solid electrolyte on which the highly reactive electrode is formed
- the support is provided on the side or the other side, and the electrode is placed between the solid electrolyte and the support, and the amount of the gas to be measured in contact with the electrode is controlled to suppress the reaction with the gas to be measured at the electrode. It is possible. Accordingly, by adjusting the reaction of the gas to be measured of the highly reactive electrode, it is possible to adjust the optimum state for sensing the concentration of nitrogen oxide and ammonia slip. For example, it is possible to adjust so that the reactivity is at the same level in the electrodes formed on one side and the other side of the solid electrolyte.
- the solid electrolyte is porous. Therefore, since the gas to be measured passes from one side to the other side of the solid electrolyte, the gas to be measured reaches all the electrodes formed on one side and the other side of the solid electrolyte quickly and uniformly. Therefore, it is possible to detect nitrogen oxide concentration and ammonia slip quickly and accurately.
- FIG. 1 is a view showing a conventional selective catalytic reduction system.
- FIG. 2 is an exploded perspective view of an embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- Figure 3 is a perspective view of a measuring cell of another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 4 is a graph illustrating voltage measurement results according to changes in concentrations of nitrogen oxides and ammonia when a current source of ⁇ 5 mA is used as a power source of the nitrogen oxide concentration measurement and ammonia slip detection sensor of FIG. 2.
- FIG. 5 is a perspective view of a measuring cell of another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- Figure 6 is a perspective view of a measuring cell of another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 7 is a perspective view of a measuring cell of another embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 8 is a perspective view of a measuring cell of another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 9 is a perspective view of a measuring cell of another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 10 is an exploded perspective view of a measuring cell of another embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 11 is an exploded perspective view of a measurement cell of another embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- FIG. 2 is an exploded perspective view of an embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- one embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention is to heat the measurement cell 100 to a temperature at which the measurement cell 100 and the measurement cell 100 can be operated It includes a heating unit 200 for.
- the measurement cell 100 is disposed between the first support layer 10, the oxygen ion conductive solid electrolyte 20 stacked on the first support layer 10, and the solid electrolyte 20 and the first support layer 10.
- the first electrode 30, the second electrode 40, the third electrode 50, and the current collectors 60 formed on the electrodes 30, 40, and 50 contacting the solid electrolyte 20 are included.
- the terminal 61 includes a terminal 61 connected to the current collectors 60, a power supply device 70 connected to the terminal 61, and a measuring device 71.
- FIG. 3 is a perspective view of the measuring cell 100.
- the first support layer 10, the solid electrolyte 20, the electrodes 30, 40, and 50, the current collector 60, and the terminal 61 constituting the measurement cell 100 are displayed.
- the configuration of the cell 100 is omitted.
- the first electrode 30, the second electrode 40, and the third electrode 50 are formed on one side surface of the plate-shaped solid electrolyte 20.
- one side of the solid electrolyte 20 is provided with a first support layer 10 as a plate-like support for supporting the solid electrolyte 20.
- the solid It is provided on one side of the electrolyte 20.
- the lead wire which connects the electrical power collector 60 and the terminal 61 in FIG. 2 is formed in one side surface of the 1st support layer 10, in FIG. 3, the electrical power collector 60 and the terminal 61 are FIG. Lead wires connecting the wires are formed on the other side of the first support layer 10.
- the lead wire which connects the electrical power collector 60 and the terminal 61 may be formed in one side surface of the 1st support layer 10, and may be formed in the other side surface.
- the first electrode 30, the second electrode 40, and the third electrode 50 are all formed on the same surface, but some of them may be formed on the other surface.
- the positive electrode for example, the first electrode and the third electrode
- the negative electrode for example, the second electrode
- oxygen ions are formed in the thickness direction of the solid electrolyte 20.
- oxygen ions move in a direction substantially perpendicular to the thickness direction through the solid electrolyte 20 between the positive electrode and the negative electrode.
- the oxygen ion conductive solid electrolyte 20 is capable of conducting oxygen ions at a high temperature, and may be stabilized zirconia, CeO 2 , ThO 2 , or the like.
- the solid electrolyte 20 is porous and is in contact with the porous ammonia oxidation catalyst layer 21 described later.
- passage pores through which gas passes from the other side facing the one side to the one side contacting the first support layer 10 are formed. From this, the measuring cell 100 passes through the inside of the porous ammonia oxidation catalyst layer 21 and the inside of the solid electrolyte 20 from the outside of the porous ammonia oxidation catalyst layer 21 from the outside of the porous ammonia oxidation catalyst layer 21. It is comprised so that 30, the 2nd electrode 40, and the 3rd electrode 50 may be reached.
- the solid electrolyte 20 may be dense.
- a flow path through which gas passes from the other side to the one side of the solid electrolyte 20 can be formed in the solid electrolyte 20.
- the first electrode 30 and the second electrode 40 may be made of a semiconductor metal oxide that is reactive to nitrogen oxides and oxygen when power is applied thereto.
- the first electrode 30 and the second electrode 40 may be the same or different semiconductor metal oxides.
- the first electrode 30 and the second electrode 40 may be CuO, NiO, CoO, Cr 2 O 3 , Cu 2 O, MoO 2 , Ag 2 O, Bi 2 O 3 , Pr 2 O 3 , ZnO, MgO And V 2 O 5 , Fe 2 O 3 , TiO 2 , CeO 2 , WO 3 and MnO.
- a solid electrolyte, an insulator oxide, a glass component, and a noble metal component are applied to the first electrode 30 and the second electrode 40. It can also be included.
- the third electrode 50 may be made of a semiconductor metal oxide having reactivity with ammonia and oxygen when power is applied.
- the third electrode 50 may include at least one material selected from the group consisting of ZnO, SnO 2, and In 2 O 3 .
- the third electrode 50 and the first electrode 30 are connected in parallel with each other. That is, one surface of the first electrode 30 and the third electrode 50 is in contact with the solid electrolyte 20, and the surface not in contact with the solid electrolyte 20 is electrically connected to each other.
- the nitrogen oxide concentration measurement and the ammonia slip detection sensor according to the present embodiment includes an ammonia oxidation catalyst layer 21 formed in a path through which ammonia flows toward the third electrode 50.
- the ammonia oxidation catalyst layer 21 may be formed on the surface of the solid electrolyte 20 so that only the ammonia gas of a predetermined concentration or more reaches the third electrode 50.
- the ammonia oxidation catalyst layer 21 is made of noble metals such as Pt, Pd, Rh, Ir, Ru, Ag, porous ceramics in which noble metals are dispersed, Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Complex oxides such as Fe-Al 2 O 3 , Mn-Al 2 O 3 , CuO-Al 2 O 3 , Fe 2 O 3 -Al 2 O 3 , Fe 2 O 3 -TiO 2 , Fe 2 O 3 -ZrO 2 At least one or more materials selected from catalysts, ion exchange zeolites, and the like.
- noble metals such as Pt, Pd, Rh, Ir, Ru, Ag, porous ceramics in which noble metals are dispersed, Co 3 O 4 , MnO 2 , V 2 O 5 , Ni-Al 2 O 3 , Complex oxides such as Fe-Al 2 O 3 , Mn-Al 2 O 3 ,
- the ammonia oxidation catalyst layer 21 serves to oxidize and remove ammonia gas. Therefore, by adjusting the thickness of the ammonia oxidation catalyst layer 21, it is possible to adjust the concentration of ammonia gas that can reach the third electrode (50).
- the current collector 60 is coupled to the first electrode 30, the second electrode 40, and the third electrode 50, respectively.
- the current collector 60 may be formed of an electrically conductive metal, and may be formed of a noble metal so as to withstand the corrosive environment.
- the precious metal at least one selected from gold (Au), silver (Ag), platinum (Pt), iridium (Ir), palladium (Pd) and alloys thereof may be applied, and gold or platinum may be preferably used. Do.
- the power supply device 70 supplies power between the first electrode 30 and the third electrode 50 and the second electrode 40 connected in parallel to each other through the terminal 61 connected to the current collectors 60. Is authorized.
- FIG. 2 shows that the power supply 70 is a current source, the power supply 70 may be a voltage source.
- the measuring device 71 includes a potential difference between the first electrode 30 and the third electrode 50 and the second electrode 40 connected in parallel to each other through the terminal 61 connected to the current collectors 60. Measure the current.
- the measuring device 71 may be a voltmeter, and in the case of using a voltage source, it may be an ammeter.
- the first electrode 30 and the third electrode 50 may be defined as positive electrodes, and the second electrode 40 may be defined as negative electrodes, but vice versa.
- the first electrode 30 and the third electrode 50 are defined as positive electrodes
- the second electrode 40 is defined as negative electrodes, and the concentration of nitrogen oxides and ammonia detection principles will be described.
- an anodic reaction in which oxygen ions are converted to oxygen gas occurs, and at the same time, when nitrogen oxide (NO) gas is present, Likewise, the anodic reaction by nitric oxide occurs.
- a current source is used as the power source, the voltage between the first electrode 30 and the second electrode 40 decreases to flow a constant current, and when using a voltage source as the power source, the first voltage is maintained to maintain a constant voltage. The magnitude of the current flowing between the electrode 30 and the second electrode 40 increases.
- a cathodic reaction in which oxygen gas is converted into oxygen ions occurs, and at the same time, when nitrogen dioxide (NO 2 ) gas is present, Similarly, the cathodic reaction by nitrogen dioxide (NO 2 ) occurs to reduce the magnitude of the voltage for flowing a constant current, and to increase the current for maintaining a constant voltage.
- an electrical signal such as a potential difference or a magnitude of current depends on the concentration of nitrogen dioxide and nitrogen monoxide in the nitrogen oxide gas.
- the size of can change to measure the sum of the concentrations of nitrogen dioxide and nitrogen monoxide.
- an anodic reaction of converting oxygen ions into oxygen gas occurs at the interface between the third electrode 50 electrically connected to the first electrode 30, which is a positive electrode, and the solid electrolyte 20, and at the same time, ammonia In the presence of (NH 3 ) gas, as shown in Equation 3 below, an anodic reaction by ammonia occurs to reduce the magnitude of the voltage to flow a constant current, and to increase the magnitude of the current to maintain a constant voltage.
- FIG. 4 is a graph illustrating voltage measurement results according to changes in concentrations of nitrogen oxides and ammonia when a current source of ⁇ 5 mA is used as a power source of the nitrogen oxide concentration measurement and ammonia slip detection sensor of FIG. 2.
- NiO was used as the first electrode 30
- LaCoO 3 was used as the second electrode 40
- In 2 O 3 was used as the third electrode 50
- stabilized zirconia was used as the oxygen ion conductive solid electrolyte 20.
- Platinum was used as the collector 60. The voltage was measured while changing the concentration of nitrogen oxide and ammonia under the condition of 20% oxygen partial pressure.
- the nitrogen oxide concentration measurement and the ammonia slip detection sensor output different voltage values when the concentration of ammonia is low and when the concentration of ammonia is high.
- the nitrogen oxide concentration measurement and the ammonia slip detection sensor When the concentration of ammonia is low, it can be seen that the nitrogen oxide concentration measurement and the ammonia slip detection sensor output a voltage value proportional to the total concentration of the nitrogen oxides. That is, in this section, the nitrogen oxide concentration measurement and ammonia slip detection sensor outputs a value between -240mV and -140mV in proportion to the concentration of nitrogen oxide. And ammonia contained in the exhaust gas is ignored. At this time, the concentration value of ammonia that can be ignored can be determined by the thickness and composition of the ammonia oxidation catalyst layer 21 surrounding the solid electrolyte 20.
- the ammonia slip is only when the concentration of ammonia is 50 ppm or more, the ammonia having a concentration of less than 50 ppm is removed before reaching the third electrode 50 and only the ammonia having a higher concentration reaches the third electrode 50.
- the thickness of the ammonia oxidation catalyst layer 21 is adjusted so as to.
- the nitrogen oxide concentration measurement and the ammonia slip detection sensor output a value between -120 mV and -80 mV by an anodical reaction at the third electrode 50 regardless of the nitrogen oxide concentration. .
- the nitrogen oxide concentration measurement and ammonia slip detection sensor can accurately measure the concentration of nitrogen oxides within a range that is not determined to be ammonia slip due to the low ammonia concentration in the exhaust gas. In the range determined as slip, it is possible to detect whether ammonia slips.
- the heating unit 200 includes a second support layer 80, a third support layer 81, and a heater 90 disposed therebetween.
- the heater 90 is formed in a meandering shape in order to increase the amount of heat generated.
- an insulating layer may be formed on the upper and lower surfaces of the heater 90.
- the insulating layer may be made of a ceramic mainly composed of alumina (Al 2 O 3 ).
- the heating unit 200 prints a heater made of platinum or the like on a third support layer green sheet, laminates a second support layer green sheet thereon, and compresses the second support layer green sheet and the third support layer green sheet. Thereafter, the second support layer green sheet and the third support layer green sheet on which the heater is printed may be heat-treated.
- 5 to 11 show a perspective view of a measuring cell 100 of still another embodiment of the nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- the first support layer 10 the solid electrolyte 20, the electrodes 30, 40, and 50, the current collector 60, and the terminal 61 constituting the measurement cell 100 are included.
- the configuration of other measurement cells 100 is omitted.
- 8 and 9 show only the solid electrolyte 20 and the electrodes 30, 40, 50, the current collector 60, and the terminal 61 constituting the measurement cell 100.
- the configuration of the measurement cell 100 is omitted.
- the lead wire which connects the electrical power collector 60 and the terminal 61 is formed in the surface in which the electrode is formed in the 1st support layer 10.
- lead wires connecting the current collector 60 and the terminal 61 are formed on the surface where the electrode is formed in the solid electrolyte 20.
- the lead wire which connects the electrical power collector 60 and the terminal 61 is formed in the surface on the opposite side to the side in which the electrode of the 1st support layer 10 is formed.
- the lead wire connecting the current collector 60 and the terminal 61 may be formed on one side of the first support layer 10 or the solid electrolyte 20 or may be formed on the other side. .
- the first support layer formed on one side of the solid electrolyte 20 according to the embodiment shown in FIGS. 2 and 3 is formed on the other side of the solid electrolyte 20.
- the upper side is the other side of the solid electrolyte 20
- the lower side is described as one side of the solid electrolyte 20
- the upper side is one side of the solid electrolyte 20. To the other side of the solid electrolyte 20.
- the first support layer 10 is provided on the other side of the plate-shaped solid electrolyte 20.
- the first electrode 30, the second electrode 40, and the third electrode 50 are formed on one side surface of the solid electrolyte 20.
- an ammonia oxidation catalyst layer 21 is formed on one side of the solid electrolyte 20 (see FIG. 2). That is, in the state where the first electrode 30, the second electrode 40, and the third electrode 50 are disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21, the solid electrolyte ( 20) is provided on one side.
- FIGS. 6 shows that the second electrode 40 formed on one side of the solid electrolyte 20 according to the embodiment shown in FIGS. 2 and 3 is formed on the other side of the solid electrolyte 20. There is a difference in that.
- the first electrode 30 and the third electrode 50 are formed on one side surface of the plate-shaped solid electrolyte 20.
- the second electrode 40 is formed on the other side of the solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed in the other side of the solid electrolyte 20 (refer FIG. 2). That is, the first electrode 30 and the third electrode 50 are provided on one side of the solid electrolyte 20 in a state in which the first electrode 30 and the third electrode 50 are disposed between one side of the solid electrolyte 20 and the first support layer 10. It is.
- the second electrode 40 is provided on the other side of the solid electrolyte 20 while being disposed between the other side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21.
- FIG. 7 differs from the embodiment shown in FIG. 6 in that the first support layer 10 formed on one side of the solid electrolyte 20 is formed on the other side of the solid electrolyte 20.
- the upper side is the other side of the solid electrolyte 20
- the lower side is the one side of the solid electrolyte 20
- the upper side is the one side of the solid electrolyte 20
- the bottom side is the other side of the solid electrolyte 20.
- the second electrode 40 is formed on the other side of the plate-shaped solid electrolyte 20.
- the first support layer 10 is provided on the other side of the solid electrolyte 20.
- the first electrode 30 and the third electrode 50 are formed on one side surface of the solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed in one side surface of the solid electrolyte 20 (refer FIG. 2). That is, the 2nd electrode 40 is provided in the other side of the solid electrolyte 20 in the state arrange
- first electrode 30 and the third electrode 50 are disposed on one side of the solid electrolyte 20 in a state where the first electrode 30 and the third electrode 50 are disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21. It is provided.
- the embodiment shown in FIG. 5 and the measurement cell 100 do not include the first support layer 10 serving as a plate-like support for supporting the solid electrolyte 20.
- the solid electrolyte 20 can be configured to have, for example, a strength equivalent to that of the first support layer 10.
- the first electrode 30, the second electrode 40, and the third electrode 50 are formed on one side surface of the plate-shaped solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed in one side surface of the solid electrolyte 20 in which the first electrode 30, the second electrode 40, and the third electrode 50 are formed. Is formed (see FIG. 2).
- a heating unit 200 for heating the measurement cell 100 to a temperature at which the measurement cell 100 can operate is provided on the other side of the solid electrolyte 20 (see FIG. 2). ). That is, on one side of the solid electrolyte 20, in a state where the first electrode 30 and the third electrode 50 are disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21, It is provided.
- the embodiment shown in FIG. 7 and the measurement cell 100 do not include the first support layer 20 serving as a plate-like support for supporting the solid electrolyte 20. It differs in that point.
- the solid electrolyte 20 can be configured to have, for example, a strength equivalent to that of the first support layer 10.
- the second electrode 40 is formed on the other side of the solid electrolyte 20.
- a heating unit 200 for heating the measurement cell 100 to a temperature at which the measurement cell 100 can operate is provided on the other side of the solid electrolyte 230.
- the first electrode 30 and the third electrode 50 are formed on one side surface of the solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed in one side surface of the solid electrolyte 20 (refer FIG. 2). That is, the second electrode 40 is provided on the other side of the solid electrolyte 20 while being disposed between the other side of the solid electrolyte 20 and the heating unit 200.
- the first electrode 30 and the third electrode 50 are provided on one side of the solid electrolyte 20 while being disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21. It is.
- FIG. 10 is an exploded perspective view of a measurement cell of another embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- This embodiment differs from the embodiment shown in FIG. 2 in that the fourth electrode 150 is used instead of the first electrode 30 and the third electrode 50 of the embodiment shown in FIG. Only in detail.
- the second electrode 40 and the fourth electrode 150 are formed on one side surface of the plate-shaped solid electrolyte 20.
- the first support layer 10 is provided on one side of the solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed on the other side of the solid electrolyte 20. That is, the second electrode 40 and the fourth electrode 150 are provided on one side of the solid electrolyte 20 while being disposed between one side of the solid electrolyte 20 and the first support layer 10. have.
- the fourth electrode 150 includes a first electrode layer 151 that is reactive with nitrogen oxides and a third electrode layer 152 that is reactive with ammonia.
- the first electrode layer 151 may serve as an ammonia oxidation catalyst, the first electrode layer 151 is formed on the solid electrolyte 20, and the third electrode layer 152 is formed. It is preferable to form on the first electrode layer 151.
- the first electrode layer 151 may be formed of CuO, NiO, CoO, Cr 2 O 3 , Cu 2 O, MoO 2 , Ag 2 O, Bi 2 O 3 , Pr 2 O 3 , ZnO, It may include at least one material selected from the group consisting of MgO, V 2 O 5 , Fe 2 O 3 , TiO 2 , CeO 2 , WO 3 and MnO.
- the third electrode layer 152 may include at least one material selected from the group consisting of ZnO, SnO 2, and In 2 O 3 .
- ammonia oxidation catalyst layer 21 surrounding the solid electrolyte 20 may be formed to reach only the ammonia gas having a predetermined concentration or more on the surface of the fourth electrode 150.
- the fourth electrode 150 may be formed by printing the second electrode paste, the first electrode paste, and the ammonia oxidation catalyst paste in order by screen printing or the like on a solid electrolyte green sheet, followed by heat treatment. .
- the present invention is not limited thereto, and the second electrode 40 and One of the fourth electrodes 150 may be formed on one side of the solid electrolyte 20, and the other may be formed on the other side of the solid electrolyte 20.
- the second electrode 40 or the fourth electrode 150 formed on the other side of the solid electrolyte 20 is disposed between the other side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21, It is provided on the other side of the solid electrolyte 20.
- the first support layer 10 is provided on one side of the solid electrolyte 20, and the ammonia oxidation catalyst layer 21 is provided on the other side of the solid electrolyte 20.
- the first support layer 21 may be provided on the other side of the solid electrolyte 20, and the ammonia oxidation catalyst layer 21 may be provided on one side.
- the second electrode 40 and the fourth electrode 150 are provided on one side of the solid electrolyte 20 while being disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21. do.
- FIG. 11 is an exploded perspective view of a measurement cell of another embodiment of a nitrogen oxide concentration measurement and ammonia slip detection sensor according to the present invention.
- This embodiment differs from the embodiment shown in FIG. 2 in that a fifth electrode 250 is used instead of the first electrode 30 and the third electrode 50 of the embodiment shown in FIG. Only in detail.
- the second electrode 40 and the fifth electrode 250 are formed on one side surface of the plate-shaped solid electrolyte 20.
- the first support layer 10 is provided on one side surface of the solid electrolyte 20.
- the ammonia oxidation catalyst layer 21 is formed on the other side of the solid electrolyte 20. That is, the second electrode 40 and the fifth electrode 250 are provided on one side of the solid electrolyte 20 while being disposed between one side of the solid electrolyte 20 and the first support layer 10. have.
- the fifth electrode 250 includes a first electrode material that is reactive with nitrogen oxides and a third electrode material that is reactive with ammonia.
- the first electrode material is CuO, NiO, CoO, Cr 2 O 3 , Cu 2 O, MoO 2 , Ag 2 O, Bi 2 O 3 , Pr 2 O 3 , ZnO, MgO, V like the first electrode 30. It may comprise at least one material selected from the group consisting of 2 O 5 , Fe 2 O 3 , TiO 2 , CeO 2 , WO 3 and MnO.
- the third electrode material may include at least one material selected from the group consisting of ZnO, SnO 2, and In 2 O 3 .
- the fifth electrode 250 may be formed by mixing a first electrode material, a third electrode material, a binder, a solvent, and the like to prepare a paste, and then printing the paste on a solid electrolyte green sheet and then performing heat treatment. Can be.
- ammonia oxidation catalyst layer 21 may be formed on the surface of the solid electrolyte 20.
- the second electrode 40 and the fifth electrode 250 are formed on one side of the solid electrolyte 20, but are not limited thereto, and the second electrode 40 and the fifth electrode are not limited thereto.
- One of the electrodes 250 may be formed on one side of the solid electrolyte 20, and the other may be formed on the other side of the solid electrolyte 20.
- the second electrode 40 or the fifth electrode 250 formed on the other side of the solid electrolyte 20 is disposed between the other side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21. And the other side of the solid electrolyte 20.
- the first support layer 10 is provided on one side of the solid electrolyte 20, and the ammonia oxidation catalyst layer 21 is provided on the other side of the solid electrolyte 20.
- the present invention is not limited thereto, and the first support layer 10 may be provided on the other side of the solid electrolyte 20, and the ammonia oxidation catalyst layer 21 may be provided on one side of the solid electrolyte 20.
- the second electrode 40 and the fifth electrode 250 are provided on one side of the solid electrolyte 20 while being disposed between one side of the solid electrolyte 20 and the ammonia oxidation catalyst layer 21. do.
- ammonia oxidation catalyst layer 21 is shown as being formed on the surface of the solid electrolyte 20 in the embodiment shown in FIG. Can be.
- it may be formed on the sensor housing or on the surfaces of the third electrode, the fourth electrode, and the fifth electrode which are reactive with ammonia.
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Abstract
Description
Claims (22)
- 산소이온 전도성 고체 전해질과,상기 고체 전해질과 접하며, 질소산화물에 대해서 반응성이 있는 제1 전극과,상기 고체 전해질과 접하며, 상기 제1 전극과 분리되며, 질소산화물에 대해서 반응성이 있는 제2 전극과,상기 고체 전해질과 접하며, 상기 제2 전극과 분리되며, 상기 제1 전극과 병렬 연결되며, 암모니아에 대해서 반응성이 있는 제3 전극과,병렬 연결된 상기 제1 전극 및 제3 전극과, 상기 제2 전극 사이에 전원을 인가하도록 구성된 전원장치와,병렬 연결된 상기 제1 전극 및 제3 전극과, 상기 제2 전극 사이의 전위차 또는 전류를 측정하도록 구성된 측정장치를 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제1 전극, 상기 제2 전극 및 상기 제3 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제1 전극 및 상기 제3 전극이 형성되고,상기 고체 전해질의 상기 한쪽 측면에 대향하는 다른 측면에 상기 제2 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항 내지 제3항 중 어느 한 항에 있어서,암모니아가 상기 제3 전극을 향해서 흐르는 경로에 형성된 암모니아 산화 촉매 층을 더 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제4항에 있어서,상기 암모니아 산화 촉매 층이 상기 고체 전해질의 표면에 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제4항에 있어서,상기 암모니아 산화 촉매 층은 Pt, Pd, Rh, Ir, Ru, Ag 중에서 선택된 적어도 하나 이상의 물질을 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제4항에 있어서,상기 암모니아 산화 촉매 층은 귀금속이 분산된 다공성 세라믹을 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제4항에 있어서,상기 암모니아 산화 촉매 층은 Co3O4, MnO2, V2O5, Ni-Al2O3, Fe-Al2O3, Mn-Al2O3, CuO-Al2O3, Fe2O3-Al2O3, Fe2O3-TiO2, Fe2O3-ZrO2 중에서 선택된 적어도 하나 이상의 물질을 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제4항에 있어서,상기 암모니아 산화 촉매 층은 이온 교환 제올라이트를 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항 내지 제9항 중 어느 한 항에 있어서,상기 제3 전극은 ZnO, SnO2 및 In2O3로 이루어진 군으로부터 선택된 적어도 하나 이상의 물질을 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 산소이온 전도성 고체 전해질과,상기 고체 전해질과 접하며, 질소산화물에 대해서 반응성이 있는 제2 전극과,상기 고체 전해질과 접하며, 상기 제2 전극과 분리되며, 질소산화물에 대해서 반응성이 있는 제1 전극 층과 암모니아에 대해서 반응성이 있는 제3 전극 층을 포함하는 제4 전극과,상기 제2 전극과 상기 제4 전극 사이에 전원을 인가하도록 구성된 전원장치와,상기 제2 전극과 상기 제4 전극 사이의 전위차 또는 전류를 측정하도록 구성된 측정장치를 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제11항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제2 전극 및 상기 제4 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제11항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제2 전극이 형성되고,상기 고체 전해질의 상기 한쪽 측면에 대향하는 다른 측면에 상기 제4 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제11항 내지 제13항 중 어느 한 항에 있어서,암모니아가 상기 제4 전극을 향해서 흐르는 경로에 형성된 암모니아 산화 촉매 층을 더 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제14항에 있어서,상기 암모니아 산화 촉매 층이 상기 고체 전해질의 표면에 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 산소이온 전도성 고체 전해질과,상기 고체 전해질과 접하며, 질소산화물에 대해서 반응성이 있는 제2 전극과,상기 고체 전해질과 접하며, 상기 제2 전극과 분리되며, 질소산화물에 대해서 반응성이 있는 제1 전극 물질과 암모니아에 대해서 반응성이 있는 제3 전극 물질을 포함하는 제5 전극과,상기 제2 전극과 상기 제5 전극 사이에 전원을 인가하도록 구성된 전원장치와,상기 제2 전극과 상기 제5 전극 사이의 전위차 또는 전류를 측정하도록 구성된 측정장치를 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제16항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제2 전극 및 상기 제5 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제16항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질의 한쪽 측면에 상기 제2 전극이 형성되고,상기 고체 전해질의 상기 한쪽 측면에 대향하는 다른 측면에 상기 제5 전극이 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제16항 내지 제18중 중 어느 한 항에 있어서,암모니아가 상기 제5 전극을 향해서 흐르는 경로에 형성된 암모니아 산화 촉매 층을 더 포함하는 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제19항에 있어서,상기 암모니아 산화 촉매 층이 상기 고체 전해질의 표면에 형성된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항 내지 제20항 중 어느 한 항에 있어서,상기 고체 전해질은 판상이며,상기 고체 전해질과 접하는 판상의 지지체를 구비하며,상기 지지체가 상기 고체 전해질의 한쪽 측면 또는 상기 한쪽 측면에 대향하는 다른 측면에 마련된 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
- 제1항 내지 제21항 중 어느 한 항에 있어서,상기 고체 전해질은 다공질인 질소산화물 농도 측정 및 암모니아 슬립 감지 센서.
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CN201780020733.3A CN109073585A (zh) | 2016-03-30 | 2017-03-30 | 测定氮氧化物浓度及检测氨泄漏的传感器 |
EP17775843.0A EP3438653A4 (en) | 2016-03-30 | 2017-03-30 | SENSOR FOR MEASURING THE STICK OXIDE CONCENTRATION AND DETECTION OF AMMONIA SLIP |
JP2017559692A JP6418587B2 (ja) | 2016-03-30 | 2017-03-30 | 窒素酸化物濃度測定及びアンモニアスリップ検出センサー |
US16/089,649 US20190204263A1 (en) | 2016-03-30 | 2017-03-30 | Sensor for measuring concentration of nitrogen oxides and detecting ammonia slip |
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EP (1) | EP3438653A4 (ko) |
JP (1) | JP6418587B2 (ko) |
KR (1) | KR101951253B1 (ko) |
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WO2022127143A1 (zh) * | 2020-12-14 | 2022-06-23 | 海南聚能科技创新研究院有限公司 | 一种一氧化氮浓度的检测装置及一氧化氮浓度检测仪 |
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- 2017-03-30 CN CN201780020733.3A patent/CN109073585A/zh active Pending
- 2017-03-30 KR KR1020170041102A patent/KR101951253B1/ko active IP Right Grant
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US20190204263A1 (en) | 2019-07-04 |
KR101951253B1 (ko) | 2019-02-22 |
EP3438653A1 (en) | 2019-02-06 |
JP2018523099A (ja) | 2018-08-16 |
JP6418587B2 (ja) | 2018-11-07 |
CN109073585A (zh) | 2018-12-21 |
KR20170113424A (ko) | 2017-10-12 |
EP3438653A4 (en) | 2019-11-27 |
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