CN105797708A - Preparation method of ternary tail gas catalyst - Google Patents
Preparation method of ternary tail gas catalyst Download PDFInfo
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- CN105797708A CN105797708A CN201610267754.2A CN201610267754A CN105797708A CN 105797708 A CN105797708 A CN 105797708A CN 201610267754 A CN201610267754 A CN 201610267754A CN 105797708 A CN105797708 A CN 105797708A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/002—Mixed oxides other than spinels, e.g. perovskite
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2523/00—Constitutive chemical elements of heterogeneous catalysts
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to an automobile tail gas catalyst, in particular relates to a preparation process of a ternary tail gas catalyst. The preparation process comprises the following steps: mixing zirconium oxide, cerium oxide and lanthanum powder in parts by weight and carrying out ball milling on a mixture; then adding aluminum oxide powder and continually carrying out ball milling to obtain compound powder; preparing the compound powder into paste with de-ionized water; immersing a pre-treated cordierite carrier into the paste; taking out the carrier and blowing away the surplus paste in a pore channel; drying and roasting to obtain the catalyst. By carrying out ball milling to refine catalyst powder particles, the size of crystal grains reaches a nano grade; meanwhile, metal lanthanum is adopted so that the activity of the catalyst is improved; the obtained catalyst has a uniform and dense plated layer and also has good chemical stability.
Description
Technical field
The present invention relates to auto-exhaust catalyst, specifically the preparation technology of ternary tail-gas catalyst.
Background technology
Along with the increase of automobile pollution, CO, HC, NO that automobile discharges in airXMore and more.At present, motor vehicle exhaust emission has been taken strict control emission measure by many countries.Therefore the process of vehicle exhaust is increasingly becoming important problem.In the prior art, be realize by installing catalytic cleaner additional the control of motor vehicle exhaust emission, and catalytic cleaner it is crucial that catalyst.Catalyst generally adopts three-decker to be namely made up of active component, washcoat and carrier.From RE perovskite oxide (PTO) for since tail gas catalyzed, having produced Lacking oxygen owing to its A, B position can replace, noble metal catalyst is had bigger price advantage by such catalyst simultaneously so that such catalyst becomes the focus of research.But, the PTO catalytic performance of existing one-component is not good, poor stability, it is impossible to meets increasingly serious motor vehicle exhaust emission and pollutes.
Summary of the invention
For above-mentioned technical problem, the present invention provides the preparation technology of a kind of stable performance, lower-cost ternary tail-gas catalyst.
The technical solution used in the present invention is: the preparation technology of a kind of ternary tail-gas catalyst, and it comprises the following steps:
(1) by mass fraction by zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling, it is subsequently adding alumina powder and continues ball milling, obtain composite powder；
(2) above-mentioned composite powder deionized water is configured to slurry, more pretreated cordierite carrier is immersed in slurry；
(3) then take out, and blow away slurry unnecessary in duct, then carry out drying, roasting.
As preferably, in described composite powder, zirconium oxide accounts for 4 8wt%, and cerium oxide accounts for 15 20wt%, and lanthanum accounts for 2 4wt%, and surplus is aluminium oxide.
As preferably, the mixing and ball milling time is 30 50h, and continuing Ball-milling Time is 20 40h.
As preferably, ball milling adopts the rotating speed of 180 220r/min, and ratio of grinding media to material is (9 10): 1.
As preferably, the immersion time in step (2) is 2min..
As preferably, step (3) adopts 130 DEG C of dry 3h, 600 DEG C of roasting 1h.
As preferably, the pretreatment of described cordierite adopts the salpeter solution of 1mol/L to soak 1h, then cleans with deionized water, last 120 DEG C of dry 3h.
As can be known from the above technical solutions, the present invention makes catalyst fines grain refine by ball milling, and its crystallite dimension reaches nanoscale；Meanwhile, adopt lanthanoid metal the activity of catalyst is improved, it is thus achieved that catalyst not only coating uniform, fine and close, chemical stability is good.
Detailed description of the invention
The present invention is described more detail below, and illustrative examples and explanation in this present invention are used for explaining the present invention, but not as a limitation of the invention.
A kind of preparation technology of ternary tail-gas catalyst, it comprises the following steps:
First pressing mass fraction by zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling 30 50h, add aluminium oxide and continue Ball-milling Time 20 40h, obtain composite powder, wherein zirconium oxide accounts for 4 8wt%, and cerium oxide accounts for 15 20wt%, and lanthanum accounts for 2 4wt%, and surplus is aluminium oxide；Mechanical milling process adopts the rotating speed of 180 220r/min, (9 10): the ratio of grinding media to material of 1, so can obtain nano level composite powder.In mechanical milling process, owing to stress-induced isomer phase transformation can occur aluminium oxide ball milling, the α-Al of generation2O3Catalytic performance is unfavorable, so should participate in again grinding after ball milling zirconium oxide, cerium oxide and lanthanum powder；And lanthanum powder answers early stage and zirconium oxide, cerium oxide to be mixed together ball milling, otherwise it is difficult to refinement.The present invention first avoids aluminium oxide and only ball milling zirconium oxide, cerium oxide and lanthanum powder be to a certain extent, then add aluminium oxide and continue ball milling, zirconium oxide can be made to be solidly soluted into completely in cerium oxide, reduce the lattice paprmeter of cerium oxide, can make lanthanum highly dispersed in the solid solution of cerium oxide-cerium oxide simultaneously；Therefore, this ball-milling technology not only can obtain cerium oxide-cerium oxide solid solution, and has refined lanthanum powder, and whole composite powder particle diameter can reach 60 90nm.
Acquisition nanometer grade composit powder is last, it is configured to slurry with deionized water, again pretreated cordierite carrier is immersed in slurry, take out after about 1min, and blow away slurry unnecessary in duct, immersing 1min in slurry after drying again, then 130 DEG C of dry 3h, 600 DEG C of roasting 1h, so can obtain the catalyst of even compact on carrier.The pretreatment of cordierite adopts the salpeter solution of 1mol/L to soak 1h, then cleans with deionized water, last 120 DEG C of dry 3h；It is greatly promoted the performance of catalyst.
Embodiment 1
By mass fraction, zirconium oxide, cerium oxide and lanthanum powder are mixed, adopt the rotating speed of 180r/min, the ratio of grinding media to material ball milling 30h of 9:1, adding aluminium oxide and continue Ball-milling Time 20h, obtain composite powder, wherein zirconium oxide accounts for 4wt%, cerium oxide accounts for 15wt%, and lanthanum accounts for 2wt%, and surplus is aluminium oxide；Followed by deionized water, composite powder is configured to slurry, the salpeter solution that then cordierite adopts 1mol/L soaks 1h, then clean with deionized water, cool down after last 120 DEG C of dry 3h, be re-used as carrier and immerse in slurry, take out after about 1min, and blow away slurry unnecessary in duct, 1min in slurry is immersed again, then 130 DEG C of dry 3h, 600 DEG C of roasting 1h, it is thus achieved that three-way catalyst after drying；This catalyst is tested, and the conversion ratio of CO, HC and NO is reached 97.7% by it, and initiation temperature is between 180 200 DEG C.
Embodiment 2
By mass fraction, zirconium oxide, cerium oxide and lanthanum powder are mixed, adopt the rotating speed of 200r/min, the ratio of grinding media to material ball milling 40h of 10:1, adding aluminium oxide and continue Ball-milling Time 30h, obtain composite powder, wherein zirconium oxide accounts for 6wt%, cerium oxide accounts for 18wt%, and lanthanum accounts for 3wt%, and surplus is aluminium oxide；Followed by deionized water, composite powder is configured to slurry, the salpeter solution that then cordierite adopts 1mol/L soaks 1h, then clean with deionized water, cool down after last 120 DEG C of dry 3h, be re-used as carrier and immerse in slurry, take out after about 1min, and blow away slurry unnecessary in duct, 1min in slurry is immersed again, then 130 DEG C of dry 3h, 600 DEG C of roasting 1h, it is thus achieved that three-way catalyst after drying；This catalyst is tested, and the conversion ratio of CO, HC and NO is reached 98.2% by it, and initiation temperature is between 160 180 DEG C.
Embodiment 3
By mass fraction, zirconium oxide, cerium oxide and lanthanum powder are mixed, adopt the rotating speed of 220r/min, the ratio of grinding media to material ball milling 50h of 10:1, adding aluminium oxide and continue Ball-milling Time 40h, obtain composite powder, wherein zirconium oxide accounts for 8wt%, cerium oxide accounts for 20wt%, and lanthanum accounts for 4wt%, and surplus is aluminium oxide；Followed by deionized water, composite powder is configured to slurry, the salpeter solution that then cordierite adopts 1mol/L soaks 1h, then clean with deionized water, cool down after last 120 DEG C of dry 3h, be re-used as carrier and immerse in slurry, take out after about 1min, and blow away slurry unnecessary in duct, 1min in slurry is immersed again, then 130 DEG C of dry 3h, 600 DEG C of roasting 1h, it is thus achieved that three-way catalyst after drying；This catalyst is tested, and the conversion ratio of CO, HC and NO is reached 97.8% by it, and initiation temperature is between 170 190 DEG C.
The technical scheme above embodiment of the present invention provided is described in detail, principle and the embodiment of the embodiment of the present invention are set forth by specific case used herein, and the explanation of above example is only applicable to help to understand the principle of the embodiment of the present invention；Simultaneously for one of ordinary skill in the art, according to the embodiment of the present invention, all will change in detailed description of the invention and range of application, in sum, this specification content should not be construed as limitation of the present invention.
Claims (7)
1. a preparation technology for ternary tail-gas catalyst, it comprises the following steps:
(1) by mass fraction by zirconium oxide, cerium oxide and lanthanum powder mixing and ball milling, it is subsequently adding alumina powder and continues ball milling, obtain composite powder；
(2) above-mentioned composite powder deionized water is configured to slurry, more pretreated cordierite carrier is immersed in slurry；
(3) then take out, and blow away slurry unnecessary in duct, then carry out drying, roasting.
2. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: in described composite powder, zirconium oxide accounts for 4 8wt%, and cerium oxide accounts for 15 20wt%, and lanthanum accounts for 2 4wt%, and surplus is aluminium oxide.
3. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: the mixing and ball milling time is 30 50h, and continuing Ball-milling Time is 20 40h.
4. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: ball milling adopts the rotating speed of 180 220r/min, and ratio of grinding media to material is (9 10): 1.
5. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: the immersion time in step (2) is 2min.
6. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: step (3) adopts 130 DEG C of dry 3h, 600 DEG C of roasting 1h.
7. the preparation technology of ternary tail-gas catalyst according to claim 1, it is characterised in that: the pretreatment of described cordierite adopts the salpeter solution of 1mol/L to soak 1h, then cleans with deionized water, last 120 DEG C of dry 3h.
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| CN201610267754.2A CN105797708B (en) | 2016-04-27 | 2016-04-27 | A kind of preparation technology of ternary tail-gas catalyst |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107519857A (en) * | 2017-08-16 | 2017-12-29 | 柳州申通汽车科技有限公司 | The processing technology of ternary catalyst for automobile tail gas |
| CN112808260A (en) * | 2020-12-28 | 2021-05-18 | 江门市科恒实业股份有限公司 | Method for preparing cerium-zirconium solid solution by ball milling method |
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| CN101003023A (en) * | 2006-01-19 | 2007-07-25 | 清华大学 | Method for preparing catalyst to purify automobile tail gas |
| WO2011092521A1 (en) * | 2010-02-01 | 2011-08-04 | Johnson Matthey Plc | Extruded scr filter |
| US20130004391A1 (en) * | 2010-04-14 | 2013-01-03 | Umicore Ag & Co. Kg | Reduction-catalyst-coated diesel particle filter having improved characteristics |
| CN104190438A (en) * | 2014-08-12 | 2014-12-10 | 淄博加华新材料资源有限公司 | High-performance cerium zirconium oxide and production method of high-performance cerium zirconium oxide |
| CN104772162A (en) * | 2015-04-11 | 2015-07-15 | 桂林理工大学 | Zr-Ce-Mn-Fe/ZSM-5 composite oxide catalyst for NOx reduction by using low-temperature NH3 and preparation method thereof |
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2016
- 2016-04-27 CN CN201610267754.2A patent/CN105797708B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101003023A (en) * | 2006-01-19 | 2007-07-25 | 清华大学 | Method for preparing catalyst to purify automobile tail gas |
| WO2011092521A1 (en) * | 2010-02-01 | 2011-08-04 | Johnson Matthey Plc | Extruded scr filter |
| US20130004391A1 (en) * | 2010-04-14 | 2013-01-03 | Umicore Ag & Co. Kg | Reduction-catalyst-coated diesel particle filter having improved characteristics |
| CN104190438A (en) * | 2014-08-12 | 2014-12-10 | 淄博加华新材料资源有限公司 | High-performance cerium zirconium oxide and production method of high-performance cerium zirconium oxide |
| CN104772162A (en) * | 2015-04-11 | 2015-07-15 | 桂林理工大学 | Zr-Ce-Mn-Fe/ZSM-5 composite oxide catalyst for NOx reduction by using low-temperature NH3 and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107519857A (en) * | 2017-08-16 | 2017-12-29 | 柳州申通汽车科技有限公司 | The processing technology of ternary catalyst for automobile tail gas |
| CN107519857B (en) * | 2017-08-16 | 2020-07-14 | 柳州申通汽车科技有限公司 | Processing technology of automobile exhaust three-way catalyst |
| CN112808260A (en) * | 2020-12-28 | 2021-05-18 | 江门市科恒实业股份有限公司 | Method for preparing cerium-zirconium solid solution by ball milling method |
| CN112808260B (en) * | 2020-12-28 | 2023-10-20 | 江门市科恒实业股份有限公司 | Method for preparing cerium-zirconium solid solution by ball milling method |
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| CN105797708B (en) | 2018-02-16 |
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Effective date of registration: 20230112 Address after: 545616 room 2-2, 2nd floor, No.60 zhengtongdao, Luorong Town, Liuzhou City, Guangxi Zhuang Autonomous Region Patentee after: Liuzhou Xinkai Chaohua Technology Co.,Ltd. Address before: 545000 Liudong New District, Liuzhou City, Guangxi Zhuang Autonomous Region, No. 2 Shuiwan Road, No. 2 Liudong Standard Factory Building, Second Floor 212 Patentee before: LIUZHOU SHENTONG AUTOMOBILE TECHNOLOGY Co.,Ltd. |
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