CN1160153C - Method of improving performance of Pd catalyst with perovskite type oxide ABO3 - Google Patents
Method of improving performance of Pd catalyst with perovskite type oxide ABO3 Download PDFInfo
- Publication number
- CN1160153C CN1160153C CNB01130863XA CN01130863A CN1160153C CN 1160153 C CN1160153 C CN 1160153C CN B01130863X A CNB01130863X A CN B01130863XA CN 01130863 A CN01130863 A CN 01130863A CN 1160153 C CN1160153 C CN 1160153C
- Authority
- CN
- China
- Prior art keywords
- catalyst
- type oxide
- palladium
- laco
- ceo
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Catalysts (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The present invention discloses a method for increasing the performance of a palladium catalyst by a perovskite-type oxide ABO3. The method mainly uses perovskite-type oxide ABO3 combining with a palladium catalyst so as to increase the performance of the palladium catalyst. The perovskite-type oxide ABO3 has good oxygen storage ability, so the perovskite-type oxide ABO3 can promote the catalytic activity of the palladium catalyst to carbon monoxide. With the characteristic of high structure thermal stability of the perovskite-type oxide ABO3, the heat resistance of the palladium catalyst is increased, and therefore, the service life of the palladium catalyst can be prolonged.
Description
Technical field
The present invention relates to a kind of with perofskite type oxide ABO
3Improve the method for performance of Pd catalyst.
Background technology
New line along with world's environmental consciousness, people also improve day by day for the requirement of environmental quality, air quality for fear of living environment is polluted, countries such as various countries such as Taiwan, Japan, Europe and India have all formulated the strict waste gas emission standard of a cover at the problem of the pollution from exhaust emission of locomotive now.Wherein Europe is to the toxic emission control of 50c.c. motorcycle, from enforcement locomotive first phase rules in 1999, CO and HC+NO
xDischarge standard must be lower than 6g/km respectively and below the 3g/km, and plays the stricter the second stage of rules of enforcement in 2002, CO and HC+NO
xDischarge standard must be lower than 1.0g/km and 1.2g/km respectively.
Yet, for 50c.c. two stroke motorcycles, because of the efficient of intake and exhaust not as 4 stroke engines, especially in idling, acceleration and deceleration and full throttle stage, the not good discharge amount of pollution height that causes of engine combustion efficient, adding European motorcycle has the speed limit regulation, makes that how reducing the pollution of two-stroke engine 50c.c motor exhaust is a challenge.
And, with regard to catalyst converter,, catalyst certainly will be placed near engine exhaust manifold place for energy accelerator activator ignition, raising waste gas purification rate.And catalyst easy deterioration under hot environment for a long time must have good heat endurance, just can keep long service life.
In workplace, normal platinum (Pt), palladium (Pd) and rhodium (Rh) the isoreactivity metal of using made catalyst converter, and at present the employed precious metal of commercialization locomotive catalyst converter still with platinum (Pt), rhodium (Rh) is preferable and palladium (Pd) catalyst has preferable heat-resisting character.
But, palladium (Pd) catalyst also has shortcoming to be overcome, at first be that palladium (Pd) is when high-temperature oxydation hydrocarbon (HC), easily produce the incomplete oxidation reaction and form a large amount of carbon monoxide (CO), palladium (Pd) is not so good as platinum (Pt), rhodium (Rh) catalyst for carbon monoxide oxidation selectivity, particularly under oxygen condition.
Therefore,, and promote the hear resistance of palladium (Pd), will help to strengthen the possibility of palladium (Pd) catalyst practicability, not only can prolong the life-span of catalyst converter, also can adapt to following cold start test rules if can improve the catalytic activity of palladium (Pd).
Summary of the invention
By the above as can be known, the problem that existing palladium catalyst technology exists is its catalytic activity, and especially the catalytic activity to CO is not high, and its hear resistance is not high.
For adapting to along with world's environmental consciousness raises, and the waste gas emission standard of increasingly stringent, inventor's collection is specialized in the experience that catalyst converter is made for many years, has developed a kind of with perofskite type oxide (ABO at this puzzlement spy
3) improve the method for palladium (Pd) catalyst performance, to address the above problem.
The present invention is for addressing the above problem, and it is achieved through the following technical solutions:
A kind of with perofskite type oxide (ABO
3) improve the method for palladium (Pd) catalyst performance, mainly be to utilize perofskite type oxide (ABO
3) combine with palladium (Pd) catalyst, to improve the performance of palladium (Pd) catalyst, it is characterized in that:
This perofskite type oxide (ABO
3) mainly be by La
1-xSr
xCo
1-yMn
yO
3Form, it is combined with palladium (Pd) catalyst, its chemical element composition system is LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3
Wherein, this LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Element set proportional between LaCo
0.88Pd
0.02Mn
0.1O
3/ Al
2O
3To LaCo
0.80Pd
0.10Mn
0.1O
3/ Al
2O
3Between.
By technique scheme, the present invention has promoted palladium (Pd) catalyst to carbon monoxide (CO) catalytic activity, and has improved the performance of palladium (Pd) catalyst, and utilizes perofskite type oxide (ABO
3) characteristic that structure thermal stability is high, improved the hear resistance of palladium (Pd) catalyst and then the service life that can improve palladium (Pd) catalyst.
Be the effect that can describe characteristics of the present invention in detail and reach, now enumerate experimental data of the present invention and be described in detail as follows:
The specific embodiment
The present invention is a kind of with perofskite type oxide (ABO
3) improve the method for palladium (Pd) catalyst performance, mainly be to utilize perofskite type oxide (ABO
3) combine with palladium (Pd) catalyst, to improve the performance of palladium (Pd) catalyst, wherein,
This perofskite type oxide (ABO
3) it mainly is by La
1-xSr
xCo
1-yMn
yO
3Form, it is combined with palladium (Pd) catalyst, its chemical element composition system is LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3
Table 1 platinum (Pt)-rhodium (Rh) catalyst, palladium (Pd) catalyst and utilize perofskite type oxide (ABO
3) catalyst that combines with palladium (Pd), the three is for the T of HC and CO oxidation
50Temperature relatively
As shown in table 1, it has disclosed LaCo of the present invention
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3With Pd-CeO
2/ Al
2O
3And Pt-Rh/CeO
2/ Al
2O
3For the oxidability of propylene and CO, and the experimental data of each catalyst tolerates thermal property is with the locomotive waste gas of the different air-fuel ratios of differential responses condition (S＞1, S=1 and S＜1) simulation under the differential responses condition for catalyst.Experiment purpose is to understand with perofskite type oxide (ABO
3) in conjunction with palladium (Pd) catalyst, whether its response characteristic is promoted to some extent.
This Pd-CeO
2/ Al
2O
3Representative for palladium (Pd) catalyst.
This Pt-Rh/CeO
2/ Al
2O
3Representative for platinum (Pt)-rhodium (Rh) catalyst.
At first, under the reaction condition of oxygen excess (S＞1), LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst is for the initiation temperature (T from CO and HC oxidation
50) identical, slightly than Pt-Rh/CeO
2/ Al
2O
3Initiation temperature low.After catalyst is through 1000 ℃ of high temperature deteriorations, Pt-Rh/CeO
2/ Al
2O
3Catalyst is for the T of CO and HC oxidation
50Temperature obviously improves more than 40 ℃, but LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst has only risen 15～20 ℃, apparent LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst is subjected to the influence of high-temperature process slight, as shown in table 1 for CO and HC oxidation activity.
And under chemical equivalent point (S=1) reaction condition, LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3-, Pd-CeO
2/ Al
2O
3And Pt-Rh/CeO
2/ Al
2O
3Catalyst is for the T of HC oxidation
50Temperature is all close to be 195 ℃, but for the catalytic activity of CO relatively down, with Pd-CeO
2/ Al
2O
3Catalyst is relatively poor, its T
50Temperature is 185 ℃ the highest, and with Pt-Rh/CeO
2/ Al
2O
3And LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Be the best, its T
50Temperature only is 160 ℃ and 159 ℃, and is as shown in table 1.
When catalyst after 1100 ℃ of high temperature deteriorations, be Pt-Rh/CeO equally
2/ Al
2O
3The active deterioration of catalyst is the most serious, and its active degradation is again under S＞1 situation, the Pt-Rh/CeO after the high temperature deterioration
2/ Al
2O
3Catalyst, the T that oxidation CO and HC are required
50The obvious increase rate maximum of temperature is more than 80 ℃.Hence one can see that, LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3The hear resistance of catalyst still is better than Pt-Rh/CeO
2/ Al
2O
3Catalyst.And it should be noted that LaCo especially
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Catalyst activity is subjected to the minimum that influences of high temperature ageing, because of its after the high temperature degradation treatment, LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Catalyst is for the T of CO or HC oxidation
50Temperature rising degree minimum only has only and rises 14～16 ℃, apparent LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Catalyst has preferable heat-resisting character, and is as shown in table 1.
And under the situation of dysoxidation (S＜1), LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3, Pd-CeO
2/ Al
2O
3And Pt-Rh/CeO
2/ Al
2O
3Catalyst is for the T of HC oxidation
50Temperature is all close, but Pd-CeO
2/ Al
2O
3Catalyst is relatively poor for the catalytic activity of CO, because of its T
50Temperature is up to 187 ℃, and is as shown in table 1.
When catalyst after 1000 ℃ of high temperature deteriorations, be Pt-Rh/CeO equally
2/ Al
2O
3The active deterioration of catalyst is the most serious, and its active degradation is again apparently higher than the S=1 situation, the Pt-Rh/CeO after the high temperature deterioration
2/ Al
2O
3Catalyst, the T that oxidation CO and HC are required
50The obvious increase rate maximum of temperature is more than 80 ℃.And LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst activity is close because of high temperature ageing processing degradation, but the LaCo after the high temperature deterioration
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Catalyst is for the T of HC and CO oxidation reaction
50Temperature is minimum, apparent LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Catalyst promptly is the catalyst of catalytic activity the best, and is as shown in table 1.
Show Pt-Rh/CeO with regard to above-mentioned experimental data
2/ Al
2O
3Catalyst is influenced by reaction condition for HC and CO oxidability the slightest, but Pt-Rh/CeO
2/ Al
2O
3The hear resistance of catalyst is the poorest, in case through behind the high temperature ageing, Pt-Rh/CeO
2/ Al
2O
3Catalyst is for the highest can the rising about 100 ℃ of initiation temperature of HC and CO oxidation.Relatively, LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst has preferable hear resistance, LaCo behind high temperature ageing
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3And Pd-CeO
2/ Al
2O
3Catalyst is for the T of HC and CO oxidation
50Temperature is obviously than Pt-Rh/CeO
2/ Al
2O
3Catalyst is low more than 5O ℃, and is as shown in table 1.
Simultaneously, LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Compare Pd-CeO
2/ Al
2O
3Catalyst has preferable catalytic activity and hear resistance, may be because of perofskite type oxide (ABO
3) the heat endurance height, can suppress the speed of Pd metal sintering when high-temperature situation, and slow down LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3The degradation of catalyst activity, as shown in table 1.
In addition, perofskite type oxide (ABO
3) have good oxygen storage capacity, even under oxygen condition, still can promote the oxidation activity of palladium (Pd).
In addition, perofskite type oxide (ABO of the present invention
3), for convenient illustrations only with La
1-xSr
xCo
1-yMn
yO
3As embodiment, when not limiting meaning of the present invention with this, promptly the various shift design of doing according to claim generally all should be included in the claim of the present invention.
In sum, the present invention is a kind of with perofskite type oxide (ABO
3) improve the method for palladium (Pd) catalyst performance, not only can improve the catalytic activity of palladium (Pd) catalyst for carbon monoxide (CO), also can improve the service life of palladium (Pd) catalyst, really possessed the desired novelty of Patent Law, progressive and practicality, application for a patent for invention is now proposed in accordance with the law, earnestly ask early and authorize, will be deeply grateful.
Claims (2)
1, a kind of with perofskite type oxide ABO
3Improving the method for performance of Pd catalyst, mainly is to utilize perofskite type oxide ABO
3Combine with palladium catalyst,, it is characterized in that to improve the performance of palladium catalyst:
This perofskite type oxide ABO
3Mainly be by La
1-xSr
xCo
1-yMn
yO
3Form, it is combined with palladium (Pd) catalyst, its chemical element composition system is LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3
2, according to claim 1 with perofskite type oxide ABO
3Improve the method for performance of Pd catalyst, it is characterized in that: this LaCo
0.84Pd
0.06Mn
0.1O
3/ Al
2O
3Element set proportional between LaCo
0.88Pd
0.02Mn
0.1O
3/ Al
2O
3To LaCo
0.80Pd
0.10Mn
0.O3/ Al
2O
3Between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01130863XA CN1160153C (en) | 2001-08-28 | 2001-08-28 | Method of improving performance of Pd catalyst with perovskite type oxide ABO3 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01130863XA CN1160153C (en) | 2001-08-28 | 2001-08-28 | Method of improving performance of Pd catalyst with perovskite type oxide ABO3 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403196A CN1403196A (en) | 2003-03-19 |
| CN1160153C true CN1160153C (en) | 2004-08-04 |
Family
ID=4670201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01130863XA Expired - Fee Related CN1160153C (en) | 2001-08-28 | 2001-08-28 | Method of improving performance of Pd catalyst with perovskite type oxide ABO3 |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1160153C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3843091B2 (en) * | 2003-08-25 | 2006-11-08 | 本田技研工業株式会社 | Exhaust gas purification catalyst, method for producing the same, and exhaust gas purification catalyst device for vehicles |
| FR2859115B1 (en) | 2003-08-28 | 2005-10-28 | Centre Nat Rech Scient | ELECTRONIC CONDUCTION MEMBRANES AND OXYGEN ION COMPRISING A MIXED OXIDE LAYER OF VANADIUM AND MAGNESIUM |
| CN107486204A (en) * | 2017-07-26 | 2017-12-19 | 上海纳米技术及应用国家工程研究中心有限公司 | Palladium RE perovskite auto-exhaust catalyst preparation method and products thereof and application |
-
2001
- 2001-08-28 CN CNB01130863XA patent/CN1160153C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403196A (en) | 2003-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Gandhi et al. | Automotive exhaust catalysis | |
| US5996338A (en) | Exhaust gas purifying device for engine | |
| EP1537309B1 (en) | Process for treating compression ignition engine exhaust gas | |
| US7390768B2 (en) | Stabilized tin-oxide-based oxidation/reduction catalysts | |
| US9764286B2 (en) | Zoned catalyst system for reducing N2O emissions | |
| US8058205B2 (en) | Nitrogen oxide purification system | |
| EP0351197A2 (en) | Improvements in pollution control | |
| AU625277B2 (en) | Method for reducing methane exhaust emissions from natural gas-fuelled engines | |
| RU2009102771A (en) | THREE-COMPONENT CATALYTIC EXHAUST GAS NEUTRALIZER | |
| US7318915B2 (en) | Oxidation-reduction catalyst and its process of use | |
| CN111495360A (en) | Ammonia generation catalyst and aftertreatment system | |
| CN1160153C (en) | Method of improving performance of Pd catalyst with perovskite type oxide ABO3 | |
| Keenan | Exhaust Emissions Control: 60 Years of Innovation and Development | |
| CN111939898A (en) | Methanol fuel automobile exhaust purification catalyst and preparation method thereof | |
| CN102482975A (en) | Exhaust purifier of internal combustion engine | |
| JP2013220402A (en) | Catalyst apparatus for purifying of exhaust gas | |
| JP2013220401A (en) | Exhaust gas purification catalyst | |
| WO2010140780A2 (en) | Three-way catalyst having a triple layer coating structure | |
| Wu et al. | Emission control technologies for 50 and 125 cc motorcycles in Taiwan | |
| JP4236488B2 (en) | Exhaust gas purification catalyst | |
| CN2718228Y (en) | Electric heatable vehicle tail gas catalytic purifier | |
| Takeori et al. | A Study of Aftertreatment System for Spark-Assisted HCCI Engine | |
| D O'Sullivan | Meeting the Indian 2000 Emission Standards for 2-stroke 2-Wheelers-Aspects of Catalytic Converter Design | |
| KR100300179B1 (en) | catalyst system reducing NOx for gasoline GDI/lean burn engine | |
| JP6364433B2 (en) | Method and three-way catalyst material for reducing nitrogen oxides |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040804 Termination date: 20090928 |