CN105344371A - Catalyst of vehicle three-way catalytic converter - Google Patents
Catalyst of vehicle three-way catalytic converter Download PDFInfo
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- CN105344371A CN105344371A CN201510689504.3A CN201510689504A CN105344371A CN 105344371 A CN105344371 A CN 105344371A CN 201510689504 A CN201510689504 A CN 201510689504A CN 105344371 A CN105344371 A CN 105344371A
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- catalyst
- zirconium dioxide
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- automobile
- ceria
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Abstract
The invention relates to the field of processing vehicle exhaust, and concretely relates to a catalyst of a vehicle three-way catalytic converter. The catalyst is prepared from: be weight, 1-3 parts of alumina powder, 0.5-1 part of aluminum sol, 0.1-0.3 part of a mixture of modified cerium dioxide and zirconium dioxide, 1-3 parts of palladium nitrate, 0.5-1 part of rhodium nitrate, 0.2-0.3 part of ammonium persulfate, 0.2-0.3 part of sodium hydrogen sulfite, and 1-5 parts of deionized water. Ammonium persulfate and sodium hydrogen sulfite are added to the catalyst, so that the oxidation-reduction ability and the catalytic activity of the catalyst can be improved. Moreover, the catalyst uses chromium to modify the cerium dioxide powder and the zirconium dioxide powder, and the material hardness is improved. The catalyst has good oxygen storage capacity, catalytic effect and anti-compression capability.
Description
Technical field
The present invention relates to vehicle maintenance service field, be specifically related to a kind of catalyst of automobile three-way catalysts.
Background technology
Automobile three-way catalysts is mounted in most important outer purifier in automobile exhaust system, and the pernicious gases such as carbon monoxide, nitrogen oxide and the hydrocarbon that vehicle exhaust can be discharged change harmless carbon dioxide, water and nitrogen into by oxidation and reduction.Be converted to innocuous substance because this catalyst converter can mainly contain harmful substances by red for waste gas three kinds simultaneously, therefore claim ternary catalyzing unit.
At present, the catalyst composition of ternary catalyzing unit is mainly carrier, nitrate noble metal and other catalyst aid, such as rare earth material zirconium, cerium; If when in the unit catalysis area of catalyst converter, the quality of noble metal is determined, be difficult to improve catalytic effect, and due to noble metal economic cost high, be necessary that research improves the material composition of catalytic effect under the condition that the quality of noble metal in unit catalysis area is determined.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of catalyst improving the automobile three-way catalysts of catalytic effect.
The present invention is by the following technical solutions: a kind of catalyst of automobile three-way catalysts, is characterized in that, is mixed by each component of following parts by weight:
The ceria of alumina powder 1-3 part, Alumina gel 0.5-1 part, modification and mixture 0.1-0.3 part of zirconium dioxide, palladium nitrate 1-3 part, rhodium nitrate 0.5-1 part, ammonium persulfate 0.2-0.3 part, sodium hydrogensulfite 0.2-0.3 part, deionized water 1-5 part.
The chemical formula of described Alumina gel is a (Al
2o3nH
2o) bHxcH
2o, wherein: Hx is peptizing agent, b=1, a=2, c=2, n=2.
Form slip after the mixing of each component, slip is coated on the carrier of ternary catalyzing unit, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.
Described carrier is alveolate texture.
The catalyst of aforesaid a kind of automobile three-way catalysts, is mixed by each component of following parts by weight: the ceria of alumina powder 2 parts, Alumina gel 0.5 part, modification and 0.2 part, the mixture of zirconium dioxide, palladium nitrate 2 parts, rhodium nitrate 0.5 part, glossy ganoderma powder 0.3 part, ammonium persulfate 0.2 part, sodium hydrogensulfite 0.2 part, deionized water 3 parts.
Described ammonium persulfate and the mass ratio of sodium hydrogensulfite are 1:1; The mass ratio of ceria and zirconium dioxide is 1:1.
Chromium is mixed, to realize modification in described ceria and the mixture of zirconium dioxide.The mass ratio of ceria, zirconium dioxide, chromium is 1:1:0.3.The concrete grammar of modification is: pave after cerium oxide powder and Zirconium dioxide powder mixing, coat cerium oxide powder and Zirconium dioxide powder by after chromium heating and melting.
The present invention adds ammonium persulfate and sodium hydrogensulfite, improves the redox property of catalyst, and then improves the catalytic activity of catalyst; Adopt chromium to cerium oxide powder and Zirconium dioxide powder modification, improve material hardness and taken into account oxygen storage capacity, having taken into account catalytic effect and anti-pressure ability.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is further described in detail.
Embodiment 1
Catalyst is mixed by each component of following parts by weight: the ceria of alumina powder 2 parts, Alumina gel 0.5 part, modification and 0.3 part, the mixture of zirconium dioxide, palladium nitrate 2 parts, rhodium nitrate 0.5 part, ammonium persulfate 0.2 part, sodium hydrogensulfite 0.2 part, deionized water 3 parts.Form slip after the mixing of each component, slip is coated on the carrier of ternary catalyzing unit, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.Described carrier is alveolate texture.Described ammonium persulfate and the mass ratio of sodium hydrogensulfite are 1:1; Chromium is mixed, to realize modification in described ceria and the mixture of zirconium dioxide.The mass ratio of ceria, zirconium dioxide, chromium is 1:1:0.3.The concrete grammar of modification is: pave after cerium oxide powder and Zirconium dioxide powder mixing, coat cerium oxide powder and Zirconium dioxide powder by after chromium heating and melting.
Embodiment 2
Catalyst is mixed by each component of following parts by weight: the ceria of alumina powder 3 parts, Alumina gel 1 part, modification and 0.1 part, the mixture of zirconium dioxide, palladium nitrate 1 part, rhodium nitrate 1 part, ammonium persulfate 0.3 part, sodium hydrogensulfite 0.2 part, deionized water 3 parts.Form slip after the mixing of each component, slip is coated on the carrier of ternary catalyzing unit, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.Described carrier is alveolate texture.Described ammonium persulfate and the mass ratio of sodium hydrogensulfite are 1:1; Chromium is mixed, to realize modification in described ceria and the mixture of zirconium dioxide.The mass ratio of ceria, zirconium dioxide, chromium is 1:1:0.3.The concrete grammar of modification is: pave after cerium oxide powder and Zirconium dioxide powder mixing, coat cerium oxide powder and Zirconium dioxide powder by after chromium heating and melting.
Embodiment 3
Catalyst is mixed by each component of following parts by weight: the ceria of alumina powder 1 part, Alumina gel 0.5 part, modification and 0.1 part, the mixture of zirconium dioxide, palladium nitrate 1 part, rhodium nitrate 0.5 part, ammonium persulfate 0.2 part, sodium hydrogensulfite 0.2 part, deionized water 3 parts.Form slip after the mixing of each component, slip is coated on the carrier of ternary catalyzing unit, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.Described carrier is alveolate texture.Described ammonium persulfate and the mass ratio of sodium hydrogensulfite are 1:1; Chromium is mixed, to realize modification in described ceria and the mixture of zirconium dioxide.The mass ratio of ceria, zirconium dioxide, chromium is 1:1:0.3.The concrete grammar of modification is: pave after cerium oxide powder and Zirconium dioxide powder mixing, coat cerium oxide powder and Zirconium dioxide powder by after chromium heating and melting.
Comparative example 1
Catalyst is mixed by each component of following parts by weight: 0.3 part, the mixture of alumina powder 2 parts, Alumina gel 0.5 part, ceria and zirconium dioxide, palladium nitrate 2 parts, rhodium nitrate 0.5 part, deionized water 3 parts.Form slip after the mixing of each component, slip is coated on the carrier of ternary catalyzing unit, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.Described carrier is alveolate texture.The mass ratio of ceria, zirconium dioxide is 1:1.
Detect the catalyst that embodiment 1-3 and comparative example 1 are formed, its slip is coated on the carrier of ternary catalyzing unit and after roasting, calculates and after catalyst converter, continue to pass into a certain amount of gas (gas is 50N/cm to the pressure that catalyst converter causes
2) afterwards ternary catalyzing unit there is the time of obviously distortion, the time detecting embodiment 1-3 and the comparative example 1 obtained is respectively 10h, 11h, 11.5h, 8h.
Detect the catalyst of embodiment 1-3 and comparative example 1 formation, its slip be coated on ternary catalyzing unit carrier and after roasting, test it to isodose tail gas in same equal time internal absorption factor, find that the vent gas treatment rate of embodiment 1-3 and comparative example 1 is respectively 93.5%, 93.8%, 92.6%, 89.6%.
It should be noted that; the foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other correlative technology fields, be all in like manner included in scope of patent protection of the present invention.
Claims (7)
1. a catalyst for automobile three-way catalysts, is characterized in that, is mixed by each component of following parts by weight:
The ceria of alumina powder 1-3 part, Alumina gel 0.5-1 part, modification and mixture 0.1-0.3 part of zirconium dioxide, palladium nitrate 1-3 part, rhodium nitrate 0.5-1 part, ammonium persulfate 0.2-0.3 part, sodium hydrogensulfite 0.2-0.3 part, deionized water 1-5 part.
2. the catalyst of a kind of automobile three-way catalysts according to claim 1, is characterized in that, the chemical formula of described Alumina gel is a (Al
2o3nH
2o) bHxcH
2o, wherein: Hx is peptizing agent, b=1, a=2, c=2, n=2.
3. the catalyst of a kind of automobile three-way catalysts according to claim 1, is characterized in that, forms slip, be coated on the carrier of ternary catalyzing unit by slip after the mixing of each component, and and roasting 1-3 hour between 500 degrees Celsius-600 degrees Celsius.
4. the catalyst of a kind of automobile three-way catalysts according to claim 3, is characterized in that, described carrier is alveolate texture.
5. the catalyst of a kind of automobile three-way catalysts according to claim 1, is characterized in that, is mixed by each component of following parts by weight:
The ceria of alumina powder 2 parts, Alumina gel 0.5 part, modification and 0.2 part, the mixture of zirconium dioxide, palladium nitrate 2 parts, rhodium nitrate 0.5 part, glossy ganoderma powder 0.3 part, ammonium persulfate 0.2 part, sodium hydrogensulfite 0.2 part, deionized water 3 parts.
6. the catalyst of a kind of automobile three-way catalysts according to claim 1, is characterized in that, described ammonium persulfate and the mass ratio of sodium hydrogensulfite are 1:1; The mass ratio of ceria and zirconium dioxide is 1:1.
7. the catalyst of a kind of automobile three-way catalysts according to claim 6, is characterized in that, mixes chromium, to realize modification in described ceria and the mixture of zirconium dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510689504.3A CN105344371A (en) | 2015-10-23 | 2015-10-23 | Catalyst of vehicle three-way catalytic converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510689504.3A CN105344371A (en) | 2015-10-23 | 2015-10-23 | Catalyst of vehicle three-way catalytic converter |
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| CN105344371A true CN105344371A (en) | 2016-02-24 |
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| CN201510689504.3A Pending CN105344371A (en) | 2015-10-23 | 2015-10-23 | Catalyst of vehicle three-way catalytic converter |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430403A (en) * | 2011-08-29 | 2012-05-02 | 重庆海特汽车排气系统有限公司 | Low-precious metal content high-efficiency ternary catalyst and preparation method thereof |
-
2015
- 2015-10-23 CN CN201510689504.3A patent/CN105344371A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102430403A (en) * | 2011-08-29 | 2012-05-02 | 重庆海特汽车排气系统有限公司 | Low-precious metal content high-efficiency ternary catalyst and preparation method thereof |
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Application publication date: 20160224 |
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