CN109342535A - A kind of sensor chip that oxynitrides is catalytically decomposed - Google Patents
A kind of sensor chip that oxynitrides is catalytically decomposed Download PDFInfo
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- CN109342535A CN109342535A CN201811373219.0A CN201811373219A CN109342535A CN 109342535 A CN109342535 A CN 109342535A CN 201811373219 A CN201811373219 A CN 201811373219A CN 109342535 A CN109342535 A CN 109342535A
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- electrode
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- nox conversion
- induction electrode
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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
- G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
Abstract
The invention discloses a kind of sensor chips that oxynitrides is catalytically decomposed, Ceng ﹑ induction electrode Yi ﹑ induction electrode Er ﹑ reference electrode Yi ﹑ reference electrode Er ﹑ solid electrolyte is heated including test chamber Yi ﹑ Jin Qi Kou ﹑ test chamber Er ﹑ reference Qiang ﹑ NOX conversion Qiang ﹑, test chamber one is located on the left of sensor chip, air inlet is located above test chamber one, NOX conversion chamber test chamber two is sequentially located at one right side of test chamber, one inside bottom of test chamber has induction electrode one, two inside bottom of test chamber has induction electrode two, reference chamber is located at the lower section of one test chamber of test chamber, two NOX conversion chamber, reference electrode one and reference electrode two are located at the top of reference chamber, heating layer is located at below reference chamber.The present invention solves that original NOX sensor chip is integrally many and diverse, and chip fabrication technique is big, the low problem of yield rate, is suitble to promote the use of in the automobile sensor manufacturing.
Description
Technical field
The present invention relates to sensor chip fields, particularly belong to a kind of sensor chip that oxynitrides is catalytically decomposed.
Background technique
Sensor is the chip by electrochemical principle by the detection to oxonium ion ingredient in exhaust gas, is realized in detection exhaust gas
The dense and dilute degree of oxygen content, and then achieve the purpose that energy-saving environmental protection.Wherein, CN97117135.1 discloses a kind of performance
Stable sensor, purposes are the total NO accurately detected in admixture of gasxConcentration is lower than the NO in the case where 100ppmx
Concentration, and it is converted to the expression of NO concentration.Sensor is by a first chamber, a diffusion between second chamber and two chambers
Hole composition, first chamber have using zirconium oxide as partition wall made by main component oxygen ion conductor material substrate, are tested gas
Body can enter in oxidation zirconia substrate.Aerobic suction electrode is also configured on first chamber substrate, it acts as will be in first chamber
It is outer and by tested NO that oxygen in portion's atmosphere is discharged to chamberxNO in mixed gas2It is reduced into NO.NO gas passes through between two chambers
Diffusion hole enter second chamber.It is equipped with a NO detecting electrode in second chamber, and has a counterelectrode is same to be set to the second chamber
Reverse side indoor or set on chamber oxidation zirconia substrate.It is measured by the electromotive force between NO detecting electrode and counterelectrode,
Since the electromotive force is corresponding with NO concentration level, total NO is then providedxConcentration value.CN201710820859.0 invention provides gas
Body sensor, catalyst converter diagnosed system and catalyst converter diagnosed method have simple structure compared with previous multi-gas sensor
At and can perform well in diagnose catalyst converter state.Based on the pump to circulate between NOx measurement electrode and outside pump electrode
In gas sensor of the electric current to determine the NOx concentration in measured gas, do not generate outside pump electrode for the hydrocarbon gas and one
The catalytic activity of carbonoxide, sensor element also has HC sensor portion as a result, which includes pumping electricity by outside
The mixed potential unit that solid electrolyte between pole, reference electrode and two electrodes is constituted, gas sensor being capable of basis
The temperature of sensor element and selectively execute HC mode and NOx mode, HC mode be sensor element is being heated to 400
DEG C~650 DEG C when determine that the HC in measured gas is dense based on the potential difference generated between pump electrode and reference electrode on the outside
Degree, NOx mode are to determine the NOx concentration in measured gas based on pump electric current.
The working principle of above-mentioned NOX sensor chip is that tail gas is first introduced to first chamber, and takes out a part by main pump
Oxygen, NOX and remaining oxygen diffuses into second chamber again and further takes out the oxygen in tail gas by auxiliary pump, makes tail gas
Middle oxygen concentration be down to it is extremely low, then the NOX in tail gas measurement pump activated electrode effect under be decomposed into oxygen and nitrogen, pass through
The carrying current of measurement pump obtains the content of corresponding NOX.This NOX chip control system is extremely many and diverse, the production of chip also work
Skill is very big.
A kind of sensor chip that oxynitrides is catalytically decomposed of the present invention, is mainly turned NOX by rhodium Rh catalyst
It is melted into N2 and O2, test conversion front and back O2 corresponds to the variation of potential difference to test out the content of NOX in tail gas.
Summary of the invention
The present invention provides a kind of sensor chip that oxynitrides is catalytically decomposed, and is able to solve and mentions in background technique
Problem is suitble to promote the use of in the automobile sensor manufacturing.
The technical solution adopted in the present invention is as follows:
A kind of sensor chip that oxynitrides is catalytically decomposed, including test chamber Yi ﹑ Jin Qi Kou ﹑ test chamber Er ﹑ reference
Qiang ﹑ NOX conversion Qiang ﹑ heats Ceng ﹑ induction electrode Yi ﹑ induction electrode Er ﹑ reference electrode Yi ﹑ reference electrode Er ﹑ solid electrolyte, surveys
Examination chamber one is located at the left side of sensor chip entirety, and air inlet is located above the lateral wall of test chamber one, and air inlet makes test chamber
One inside and outside connection, there is NOX conversion chamber on the right side of test chamber one, there is test chamber two, one He of test chamber on the right side of NOX conversion chamber
Test chamber two is interconnected by NOX conversion chamber, and NOX conversion is intracavitary to be fixedly installed with rhodium catalyst, and the rhodium catalyst is to receive
Rice grain shape or latticed or nano particle grid combine shape, and the inside bottom of the test chamber one has induction electrode one, test
The inside bottom of chamber two has induction electrode two, and the reference chamber is integrally located at the lower section of one test chamber of test chamber, two NOX conversion chamber,
Reference electrode one and reference electrode two are located at the top of reference chamber, and reference electrode one is corresponded to each other with the position of induction electrode one,
Reference electrode two is corresponded to each other with the position of induction electrode two, the test chamber Yi ﹑ test chamber Er ﹑ reference Qiang ﹑ NOX conversion Qiang ﹑
One ﹑ induction electrode of induction electrode, two ﹑ reference electrode one and reference electrode two pass through solid electrolyte and are full of mutual gap, make
They form an entirety, and the heating layer has heating electrode and ceramic insulating layer, and heating electrode is integrally inlaid in ceramic insulation
In layer, the heating layer is integrally located at the lower section of reference chamber, one air inlet test chamber of test chamber, the two reference chamber NOX conversion chamber
It is whole that one reference electrode of heating layer induction electrode one induction electrode, two reference electrode, two solid electrolyte forms a sensor chip
Body.
Preferably, the induction electrode Yi ﹑ induction electrode Er ﹑ reference electrode one and reference electrode two are flake, heating
Heating electrode is flake in layer.
Preferably, the entire length that electrode is heated in the heating layer is greater than the length of induction electrode one, adds in heating layer
The entire length of thermode is greater than the length of induction electrode two, and the entire length that electrode is heated in heating layer is greater than reference electrode one
Length, the entire length that electrode is heated in heating layer is greater than the length of reference electrode two.
Preferably, the oxygen sensing chip generally strip flake.
Compared with the prior art, beneficial effects of the present invention are as follows:
By heating Ceng ﹑ induction electrode Yi ﹑ sense to test chamber Yi ﹑ Jin Qi Kou ﹑ test chamber Er ﹑ reference Qiang ﹑ NOX conversion Qiang ﹑
The global optimization R & D design for answering electrode Er ﹑ reference electrode Yi ﹑ reference electrode Er ﹑ solid electrolyte produces a kind of catalysis point
Solve the sensor chip of oxynitrides.Original NOX sensor chip is solved the problems, such as in use, existing: original NOX sensing
When device chip operation, tail gas is first introduced to first chamber, and the oxygen of a part is taken out by main pump, and NOX and remaining oxygen are again
It diffuses into second chamber and further takes out the oxygen in tail gas by auxiliary pump, be down to oxygen concentration extremely low, then tail
NOX in gas is decomposed into oxygen and nitrogen under the activated electrode effect of measurement pump, is obtained pair by the carrying current of measurement pump
Answer the content of NOX.This NOX chip control system is extremely many and diverse, and also technique is very big for the production of chip.
Wherein tail gas of the present invention first passes through air inlet and enters test chamber one, subsequently enters the gas of test chamber one, passes through NOX
The rhodium Rh catalyst in chamber is converted, by NOX conversion at N2 and O2, mixed gas enters test chamber two, by testing test chamber one
The variation of potential difference is corresponded to conversion front and back O2 in test chamber two, and then tests out NO in the tail gas entered by air inletXContain
Amount.Meanwhile inventive sensor chip is whole simpler, chip fabrication technique is little, high yield rate, is suitble in automobile oxygen
It is promoted the use of in sensor production manufacture.
Detailed description of the invention
Fig. 1 is the sensor chip overall structure diagram of present invention catalytic decomposition oxynitrides；
Fig. 2 is that the electromotive force of oxygen and the tail of different amount of NOx are had more after one test chamber two of test chamber in the present invention
The specific curves figure changed between gas.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment belongs to the range of invention protection.
Below with reference to embodiment and specific embodiment, the present invention is described in further detail.
A kind of sensor chip that oxynitrides is catalytically decomposed, including (6) ﹑ air inlets (the 5) ﹑ test chambers two of test chamber one
(9) ﹑ reference chambers (12) ﹑ NOX conversion chambers (8) ﹑ heating layers (1 and 2) ﹑ induction electrode, one (4) ﹑ induction electrode, two (10) ﹑ reference electricity
((11) ﹑ solid electrolytes (7), test chamber one (6) are located at the left side of sensor chip entirety, air inlet to 3) ﹑ reference electrodes two for pole one
Mouth (5) is located above the lateral wall of test chamber one (6), and air inlet (5) makes the inside and outside connection of test chamber one (6), test chamber one (6)
Right side has NOX conversion chamber (8), there is test chamber two (9), the test chamber one (6) and test chamber two on the right side of NOX conversion chamber (8)
(9) it is interconnected by NOX conversion chamber (8), rhodium catalyst is fixedly installed in NOX conversion chamber (8), the rhodium catalyst is to receive
Rice grain shape or latticed or nano particle grid combine shape, and the inside bottom of the test chamber one (6) has induction electrode one
(4), the inside bottom of test chamber two (9) has induction electrode two (10), and the reference chamber (12) is integrally located at test chamber one (6) survey
The lower section of chamber two (9) NOX conversion chamber (8) is tried, reference electrode one (3) and reference electrode two (11) are located at the upper of reference chamber (12)
Portion, reference electrode one (3) are corresponded to each other with the position of induction electrode one (4), reference electrode two (11) and induction electrode two (10)
Position correspond to each other, one (6) ﹑ test chamber, two (9) ﹑ reference chambers (12) ﹑ NOX conversion chamber (the 8) ﹑ induction electrodes one of test chamber
((10) ﹑ reference electrodes one (3) and reference electrode two (11) are full of between each other 4) ﹑ induction electrodes two by solid electrolyte (7)
Gap makes them form an entirety, and the heating layer (1 and 2) has heating electrode (2) and ceramic insulating layer (1), heats electrode
(2) whole to be inlaid in ceramic insulating layer (1), the heating layer (1 and 2) is integrally located at the lower section of reference chamber (12), the survey
Try chamber one (6) air inlet (5) test chamber two (9) reference chamber (12) NOX conversion chamber (8) heating layer (1 and 2) induction electrode one (4)
Induction electrode two (10) reference electrode one (3) reference electrode two (11) solid electrolyte (7) forms a sensor chip entirety.
Preferably, induction electrode one (4) ﹑ induction electrode two (10) ﹑ reference electrodes one (3) and the reference electrode two (11)
For flake, middle heating electrode (2) of heating layer (1 and 2) is flake.
Preferably, the entire length that electrode (2) are heated in the heating layer (1 and 2) is greater than the length of induction electrode one (4)
Degree, the entire length of heating electrode (2) is greater than the length of induction electrode two (10) in heating layer (1 and 2), in heating layer (1 and 2)
The entire length for heating electrode (2) is greater than the length of reference electrode one (3), the entirety of heating electrode (2) in heating layer (1 and 2)
Length is greater than the length of reference electrode two (11).
Preferably, the oxygen sensing chip generally strip flake.
In the use of the present invention, vehicle exhaust passes through air inlet (5) into test chamber one (6), at this moment in test chamber first
An electromotive force E1 is formed between induction electrode one (4) in one (6) and reference electrode one (3), then in test chamber one (6)
Tail gas is converted into N2 and O2 by NOX conversion chamber (8) rhodium catalyst, and mixed gas enters test chamber two (9), then in induced electricity
An electromotive force E2 is formed between pole two (10) and reference electrode two (11)；E2-E1 is exactly to pass through NOX conversion chamber (8) rhodium catalysis
The electromotive force for the oxygen having more after agent corresponds to the content of NOX.It is formulated are as follows:
PO2 (air) indicates partial pressure of oxygen in air, and PO2 (exh) 1 and PO2 (exh) 2 respectively indicate test chamber one (6) and survey
Try the oxygen partial pressure of chamber two (9).
Fixed oxygen partial pressure 10-9Pa is constant, and the content by changing NOX demarcates sensor, obtains and passes through this hair
The electromotive force of oxygen, the spy changed between the tail gas of different amount of NOx are had more after bright middle test chamber one (6) test chamber two (9)
Determine curve graph (such as Fig. 2).
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (4)
1. a kind of sensor chip that oxynitrides is catalytically decomposed, including test chamber Yi ﹑ Jin Qi Kou ﹑ test chamber Er ﹑ reference Qiang ﹑
NOX conversion Qiang ﹑ heats Ceng ﹑ induction electrode Yi ﹑ induction electrode Er ﹑ reference electrode Yi ﹑ reference electrode Er ﹑ solid electrolyte, test
Chamber one is located at the left side of sensor chip entirety, and air inlet is located above the lateral wall of test chamber one, and air inlet makes test chamber one
There is NOX conversion chamber on inside and outside connection, the right side of test chamber one, there is test chamber two, the test chamber one and survey on the right side of NOX conversion chamber
It tries chamber two to be interconnected by NOX conversion chamber, NOX conversion is intracavitary to be fixedly installed with rhodium catalyst, and the rhodium catalyst is nanometer
Graininess or latticed or nano particle grid combine shape, and the inside bottom of the test chamber one has induction electrode one, test chamber
Two inside bottom has induction electrode two, and the reference chamber is integrally located at the lower section of one test chamber of test chamber, two NOX conversion chamber, ginseng
Than the top that electrode one and reference electrode two are located at reference chamber, reference electrode one is corresponded to each other with the position of induction electrode one, ginseng
It is corresponded to each other than electrode two with the position of induction electrode two, the test chamber Yi ﹑ test chamber Er ﹑ reference Qiang ﹑ NOX conversion Qiang ﹑ sense
Electric one ﹑ induction electrode of pole, two ﹑ reference electrode one and reference electrode two is answered, full of mutual gap, to make it by solid electrolyte
Form an entirety, the heating layer has heating electrode and ceramic insulating layer, and heating electrode is integrally inlaid in ceramic insulating layer
Interior, the heating layer is integrally located at the lower section of reference chamber, and one air inlet test chamber of test chamber, the two reference chamber NOX conversion chamber adds
One reference electrode of thermosphere induction electrode one induction electrode, two reference electrode, two solid electrolyte forms a sensor chip entirety.
2. a kind of sensor chip that oxynitrides is catalytically decomposed according to claim 1, it is characterised in that the sense
Answer electricity Ji mono- ﹑ induction electrode Er ﹑ reference electrode one and reference electrode two for flake, heating electrode is flake in heating layer.
3. a kind of sensor chip that oxynitrides is catalytically decomposed according to claim 2, it is characterised in that described to add
The entire length that electrode is heated in thermosphere is greater than the length of induction electrode one, and the entire length that electrode is heated in heating layer is greater than sense
The length of electrode two is answered, the entire length that electrode is heated in heating layer is greater than the length of reference electrode one, heats electricity in heating layer
The entire length of pole is greater than the length of reference electrode two.
4. a kind of sensor chip that oxynitrides is catalytically decomposed according to claim 1, it is characterised in that the oxygen
Sensing chip generally strip flake.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373219.0A CN109342535A (en) | 2018-11-19 | 2018-11-19 | A kind of sensor chip that oxynitrides is catalytically decomposed |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811373219.0A CN109342535A (en) | 2018-11-19 | 2018-11-19 | A kind of sensor chip that oxynitrides is catalytically decomposed |
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| Publication Number | Publication Date |
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| CN109342535A true CN109342535A (en) | 2019-02-15 |
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| CN201811373219.0A Withdrawn CN109342535A (en) | 2018-11-19 | 2018-11-19 | A kind of sensor chip that oxynitrides is catalytically decomposed |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697862A (en) * | 2020-11-30 | 2021-04-23 | 广西玉柴机器股份有限公司 | NO measurement without influence of ammoniaXOf (2) a |
| CN114278413A (en) * | 2020-09-28 | 2022-04-05 | 长城汽车股份有限公司 | Urea injection system, method and vehicle |
-
2018
- 2018-11-19 CN CN201811373219.0A patent/CN109342535A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114278413A (en) * | 2020-09-28 | 2022-04-05 | 长城汽车股份有限公司 | Urea injection system, method and vehicle |
| CN114278413B (en) * | 2020-09-28 | 2022-11-29 | 长城汽车股份有限公司 | Urea injection system, method and vehicle |
| CN112697862A (en) * | 2020-11-30 | 2021-04-23 | 广西玉柴机器股份有限公司 | NO measurement without influence of ammoniaXOf (2) a |
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Application publication date: 20190215 |
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