CN1616955A - Mixed lanthanum material for automobile exhaust sensor and its preparing method - Google Patents
Mixed lanthanum material for automobile exhaust sensor and its preparing method Download PDFInfo
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- CN1616955A CN1616955A CN 200410088758 CN200410088758A CN1616955A CN 1616955 A CN1616955 A CN 1616955A CN 200410088758 CN200410088758 CN 200410088758 CN 200410088758 A CN200410088758 A CN 200410088758A CN 1616955 A CN1616955 A CN 1616955A
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- sensor
- ceo
- oxygen
- automobile exhaust
- exhaust sensor
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Abstract
The present invention relates to lanthanum doping method for material of automobile tail gas sensor, and belongs to the field of functional ceramic material technology. Available automobile tail gas sensor has CeO2 as catalyst and has excellent performance, and the present invention dopes micron level La2O3 into CeO2 to obtain obviously raised oxygen sensing performance of the sensor and further improved sensor function. Experiment shows that the La2O3 doping amount of 0.5-4 wt% results in optimal effect.
Description
Technical field:
The invention belongs to technical field of functional ceramics.
Background technology:
The lambda sensor that is used for vehicle exhaust control divides following several classes (as shown in table 1), presses the principle of operation branch: semi-conductor type, concentration cell type and electrochemical pump type; Divide by using: stoichiometry A/F type, oil-poor A/F type.
Table 1 is the control lambda sensor automatically
| ??N” | Type | Principle of work | Matrix material | Present level |
| ??1 | Stoichiometry A/F type | Concentration cell | ????ZrO 2 | Product |
| Oxide semiconductor | ????TiO 2 | Product | ||
| ????Nb 2O 5 | Test | |||
| ????CeO 2 | Test | |||
| ??2 | Oil-poor A/F type | Concentration cell | ????ZrO 2 | Test |
| Oxide semiconductor | ????CoO | Test | ||
| ????Co 1-xMg xO | Test | |||
| ????SrMg xTi 1-xO 3 | Test | |||
| The electrochemical pump type | Current limliting (ZrO 2) | Product | ||
| Two ZrO 2Battery | Test |
As can be seen from Table 1, the tail gas sensor of now having used has ZrO
2And TiO
2But all there is the shortcoming of temperature coefficient height, poor stability in the two.
The semi-conductor type lambda sensor has the undesirable gas contrast electrode, size is little, simple in structure, cost is low, be convenient to characteristics such as integrated production, becomes the main developing direction of automobile exhaust sensor.As semi-conductor type lambda sensor, TiO
2Have the quick characteristic of stronger oxygen, but studies show that the TiO of catalyst-free
2There are a series of deficiencies such as operating temperature height, the response time is long, sensitivity is low in sensor, therefore at TiO
2The middle catalyzer that adds becomes research direction.
CeO
2With other rare earth oxide mutually specific energy improve the performance of catalyzer significantly.It can improve catalyzer near theoretical air-fuel ratio to CO, HC and NO
xPurifying rate, particularly improve the catalyzer long term high temperature and use back purifying rate to CO under various air-fuel ratios.The effect of cerium oxide in purifying automobile tail gas comprises: the stability of storage oxygen effect, the thermal stability that improves catalytic carrier, the anti-poisoning capability that promotes water gas shift reaction, raising catalyzer, raising lambda sensor etc.CeO
2Multiple function in purifying automobile tail gas makes it as automobile catalyst consumption sharp increase (seeing Table 2).
Table 2 automobile catalyst CeO
2Quantity
The area limited the use of in 1988 the car number () 2000 years limit the use of the car number ()
Japan, Asia 3,850,000 1,159 ten thousand
North America 1,735 ten thousand 1,819 ten thousand
Europe 1,250,000 1,611 ten thousand
Add up to 2,245 ten thousand 4,589 ten thousand
Use amount (ton) 1,200 1900
Summary of the invention:
For improving the oxygen sensitivity of sensor, the inventor is to micron CeO
2Blended micrometer La
2O
3Carried out experimental study.The result shows: a certain amount of La
3+Mix and can significantly improve CeO
2The oxygen sensitivity of material reaches 50%---see Table 3.Work as La
2O
3Material oxygen sensitivity the best when doping is 0.5～4% (mass percentage concentration)---see Fig. 1.At CeO
2Doping La
2O
3Impel its oxygen sensitivity to significantly improve, can improve the catalytic selectivity of material, improve catalytic efficiency, improve response speed.
Table 3 is mixed lanthanum to micron CeO
2The influence of material oxygen sensitivity
| Sample | The quick factor of oxygen | Recruitment (%) |
| Pure micron CeO 2Sensor | ????4.57 | ????/ |
| 2% (mass) micron La 2O 3Blended micrometer CeO 2Sensor | ????2.25 | ????50.77 |
As seen from Figure 1, along with the increase of mixing the lanthanum amount, after reducing earlier, the quick factor of the oxygen of material increases again.According to index theorem, quick factor m is more little for oxygen, and conductivity of material is obvious more with the variation of partial pressure of oxygen, and the oxygen sensitivity of material is good more.Experimental result shows: work as La
2O
3The material oxygen sensitivity was best when doping was 0.5～4% (mass percentage concentration).
Description of drawings:
Fig. 1: La
2O
3Addition content is to CeO
2The oxygen sensitivity influence;
Fig. 2: the synoptic diagram of experimental provision;
Fig. 3: La
2O
3Doped Ce O
2The specimen preparation process flow diagram.
Embodiment:
A.La
2O
3Doped Ce O
2Specimen preparation such as Fig. 3.
B. test sample preparation
With various powder of preparing and the circle sheet that is pressed into φ 10mm, thick 1mm, put into batch-type furnace thermal treatment, then at sample surfaces silver coating slurry, extraction electrode, using voluntarily, the experimental provision of the simulated automotive exhaust emissions of assembling carries out the test of oxygen sensitivity.Though proving installation is not real environment for use, the trend of performance change when test result can reflect real use sensor.
C. method of testing
The experimental system for simulating of design and assembly is made up of three parts voluntarily: gas distributing system, measurement partial pressure of oxygen part and sample resistance test part.The synoptic diagram of experimental provision is as shown in Figure 6:
(1) gas distributing system
Pure nitrogen and pure compression air mixed are adopted in this experiment, obtain measuring required gaseous environment, regulate the mixing air that two kinds of gas flows obtain different proportioning partials pressure of oxygen by gas meter, send into conduit and decide oxygen system and measuring system.
(2) partial pressure of oxygen measuring system
The partial pressure of oxygen measurement obtains by oxygen probe.Oxygen probe is by Y
2O
3Stablize ZrO
2Pipe, Cu and CuO contrast electrode and some encapsulants are formed.
(3) resistance measurement system
The testing sample of connection electrode is put into silicon carbide rod furnace, be warming up to the sensor actual work temperature, temperature is regulated (temperature control error ± 2 ℃) by transformer in the stove, measure temperature in the stove (temperature measurement error ± 2 ℃) with nickel chromium-nickel silicon thermocouple, with DT-9927 type multimeter measuring samples resistance, thereby obtain the oxygen sensitivity of material.
Claims (3)
1. one kind with CeO
2Automobile exhaust sensor for catalyzer is made is characterized in that micron CeO
2Blended micrometer La
2O
3
2. sensor as claimed in claim 1 is characterized in that La
2O
3Doping is 0.5～4% mass percentage concentration.
3. one kind to micron CeO
2Blended micrometer La
2O
3The preparation method of material for automobile exhaust sensor, it is characterized in that micron CeO
2With micron La
2O
3Powder is after 50～100MPa is pressed into the thin slice of diameter 5～30mm by pressure, again through 1000～1500 ℃, 1～5 hour sintering after magnetic agitation was mixed in 0.5～2 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410088758 CN1616955A (en) | 2003-01-03 | 2003-01-03 | Mixed lanthanum material for automobile exhaust sensor and its preparing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410088758 CN1616955A (en) | 2003-01-03 | 2003-01-03 | Mixed lanthanum material for automobile exhaust sensor and its preparing method |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031000134A Division CN1238143C (en) | 2003-01-03 | 2003-01-03 | Material for car tail gas sensor and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1616955A true CN1616955A (en) | 2005-05-18 |
Family
ID=34766104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410088758 Pending CN1616955A (en) | 2003-01-03 | 2003-01-03 | Mixed lanthanum material for automobile exhaust sensor and its preparing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1616955A (en) |
-
2003
- 2003-01-03 CN CN 200410088758 patent/CN1616955A/en active Pending
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