CN105772023A - Manufacturing method for efficient three-component catalyst coating - Google Patents
Manufacturing method for efficient three-component catalyst coating Download PDFInfo
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- CN105772023A CN105772023A CN201610200771.4A CN201610200771A CN105772023A CN 105772023 A CN105772023 A CN 105772023A CN 201610200771 A CN201610200771 A CN 201610200771A CN 105772023 A CN105772023 A CN 105772023A
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- 238000000576 coating method Methods 0.000 title claims abstract description 322
- 239000011248 coating agent Substances 0.000 title claims abstract description 314
- 239000003054 catalyst Substances 0.000 title claims abstract description 123
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 91
- 238000000034 method Methods 0.000 claims abstract description 35
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 103
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 80
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 52
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum oxide Inorganic materials [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 50
- KTUFCUMIWABKDW-UHFFFAOYSA-N oxo(oxolanthaniooxy)lanthanum Chemical compound O=[La]O[La]=O KTUFCUMIWABKDW-UHFFFAOYSA-N 0.000 claims description 48
- 239000002994 raw material Substances 0.000 claims description 40
- 239000012190 activator Substances 0.000 claims description 37
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 32
- RCFVMJKOEJFGTM-UHFFFAOYSA-N cerium zirconium Chemical compound [Zr].[Ce] RCFVMJKOEJFGTM-UHFFFAOYSA-N 0.000 claims description 31
- 239000002131 composite material Substances 0.000 claims description 30
- GNRSAWUEBMWBQH-UHFFFAOYSA-N nickel(II) oxide Inorganic materials [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 30
- 239000006104 solid solution Substances 0.000 claims description 30
- 239000010948 rhodium Substances 0.000 claims description 29
- 229910052703 rhodium Inorganic materials 0.000 claims description 26
- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 claims description 25
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical group [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 23
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 claims description 15
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Inorganic materials [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 claims description 10
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium oxide Inorganic materials [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 7
- -1 PrO Inorganic materials 0.000 claims description 6
- 239000000969 carrier Substances 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 57
- 239000010410 layer Substances 0.000 abstract description 52
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 29
- 229910002091 carbon monoxide Inorganic materials 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 11
- 238000013461 design Methods 0.000 abstract description 11
- 239000010970 precious metal Substances 0.000 abstract description 11
- 230000032683 aging Effects 0.000 abstract description 10
- 238000011946 reduction process Methods 0.000 abstract description 7
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- 238000005516 engineering process Methods 0.000 description 17
- 230000003197 catalytic effect Effects 0.000 description 10
- 238000005245 sintering Methods 0.000 description 9
- 238000011144 upstream manufacturing Methods 0.000 description 9
- XSKIUFGOTYHDLC-UHFFFAOYSA-N palladium rhodium Chemical compound [Rh].[Pd] XSKIUFGOTYHDLC-UHFFFAOYSA-N 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 6
- 229910001928 zirconium oxide Inorganic materials 0.000 description 6
- 241000264877 Hippospongia communis Species 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 229910000510 noble metal Inorganic materials 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 150000004706 metal oxides Chemical class 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 4
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- 238000005728 strengthening Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 229910000420 cerium oxide Inorganic materials 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
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- 229910052746 lanthanum Inorganic materials 0.000 description 2
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 2
- 238000003701 mechanical milling Methods 0.000 description 2
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 2
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- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 2
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
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- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 description 1
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- 150000002910 rare earth metals Chemical class 0.000 description 1
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Classifications
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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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/89—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals
- B01J23/8933—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/8946—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with noble metals also combined with metals, or metal oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with alkali or alkaline earth metals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/944—Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
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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
-
- 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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B01J35/30—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0228—Coating in several steps
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a manufacturing method for an efficient three-component catalyst coating. The manufacturing method comprises the following steps: combining coating materials which are formed from a catalysis element, auxiliaries and various coating oxides and have different functions according to CO, HC and NOx oxidation and reduction control mechanism; segmenting a same carrier (at segmenting ratio of 1:2, 1:1 or 2:1), layering (at weight duty ratio of inner layer and surface layer of 2:1 or 1:1) and coating, wherein totally different tail gas control characteristics along axial direction of the carrier (airflow direction) is obtained according to an inner and outer two-layer secondary roasting forming compounding technique, so that the reduction process of nitric oxide (NOx) and the oxidation process for removing hydrocarbon compound (HC) and carbon monoxide (CO) happen in a certain sequence as required. The catalyst activity is effectively utilized, and meanwhile, the high-temperature ageing resisting property is promoted, the defects of alloying of different precious metals and alloying of precious metal and coating metallic oxide material are avoided, the design flexibility of the catalyst is enhanced and the optimal effect of the automobile exhaust control is achieved.
Description
Technical field
The invention belongs to auto-emission control field, particularly relate to the manufacture method of a kind of high-efficiency ternary catalyst coating.
Background technology
The conventional approach of domestic and international auto-emission control three-way catalyst coating is the activator raw material that even application mixes by a certain percentage on ceramic honey comb or honeycomb carrier, and these raw materials include aluminium oxide, zirconium oxide, cerium oxide (or cerium zirconium sosoloid) and other metal-oxides, rare earth oxide and some other additives.The three-way catalytic converter being fabricated to is arranged in the exhaust system of car combustion engine, and when vehicle exhaust flows through three-way catalyst, its three kinds of harmful gas carbon monoxides (CO), Hydrocarbon (HC) are oxidated or reduced into nontoxic carbon dioxide (CO with nitrogen oxides (NOx) simultaneously2), water (H2And nitrogen (N O)2)。
Ceramic honey comb or metallic carrier are generally adopted the two catalyst coat technology arriving three layers by conventional art, each layer is all coated with same coating material, coating covers whole carrier from air flow inlet to each minim channel surface of outlet, coating cladding material covers on nexine coating, by that analogy.The single purifier carrier so making coating is single from import to exporting tail gas control action, it is impossible to play the dual function of forward and backward level catalyst.Auto-emission control requires increasingly stringent, the various load of electromotor, rotating speed, cooling and heating machine state must be adopted different catalysis strategy, formula technique and catalysis material, therefore occur in that the front stage antigravity system that function is different, the three-way catalyst technology before state 4 (Europe 4) discharge standard are generally adopted catalyst coat and the active element of two pieces of honeycomb ceramic carriers of front stage or honeycomb carrier lift-launch high-specific surface area.Along with nearly 10 years modern vehicle and electromotor designing technique develop, specific power is increasing, vehicle is more and more compacter, parts installing space is limited, discharge standard is also more and more tighter simultaneously, parts efficiency requirements is more and more higher, front stage catalyst installation requirement takes up room greatly, the shortcoming that manufacturing cost is high just looms large, therefore the design that single-stage catalyst substitutes front stage catalyst is used to get more and more over nearest 10 years on riding gasoline car, this makes conventional coating techniques cannot meet requirement, innovation catalyst coated technology must be required from many aspects and adopt the new material technology of innovation.Therefore occur in that different coating adopts the new technique of coating material not of the same race and precious metal catalyst element not of the same race, to reach different coating material and catalytic elements plays not same-action utilize new material technology to be greatly promoted the purpose of catalyst efficiency, the exhaust gases of internal combustion engines of gasoline driven is made to control to reach optimal effectiveness.
The three-way catalyst of early stage is uniformly to apply to the same sex all coating materials metal-oxide and precious metals pt, Pd, Rh etc. such as () modified aluminas, cerium oxide, zirconium oxide and lanthanum, neodymium, yttrium, praseodymiums in the inert catalyst carrier that pottery or metal are constituted in numerous minim channels.Developed again the different catalyst technology of front stage later and on single-stage carrier, implemented the technology of inside and outside different coating.But some technology have employed the coating coating technology of more than three layers, this also means that roasting is also wanted more than three times, catalyst coat slurry processing technology is more complicated, production cost is higher.And the specificity of catalyst of each coating is the same, it is unfavorable for oxidation and the reduction chemical reaction optimization process of CO, HC and NOx.nullThe staged and layered coating technology of the present invention can make up disadvantage mentioned above，Can obtain along carrier axially (airflow direction) diverse tail gas control characteristic，Make the reduction process removing nitrogen oxides (NOx) and remove Hydrocarbon (HC)、The oxidizing process of carbon monoxide (CO) definite sequence on request occurs，Make full use of in exhaust gases of internal combustion engines the interaction of each component itself (such as CO、HC under the effect of Rh as the reducing agent of NOx) reach under identical condition optimum control effect、Avoid the alloying shortcoming of different precious metal alloys and noble metal and coating metal oxide material，Strengthen the design flexibility of catalyst，The coating molding technology thereof being maintained with in traditional handicraft double roasting，Reach to optimize control the production cost of product while tail gas control performance well with also maximizing.
Summary of the invention
For solving the problems referred to above, the invention provides the manufacture method of a kind of high-efficiency ternary catalyst coating.Single catalyst carrier will be divided leading portion and back segment two parts to be respectively applied (segmentation scales 1:2,1:1,2:1 not etc.) along airflow direction by the present invention, front and back section ratio and catalyst formulation adjust flexibly according to the requirement that tail gas is controlled respectively, adopt entirely different formula and different catalytic elements, such one pole catalyst can play the dual function of prime, rear stage catalyst, leading portion and back segment may be used without layering coating simultaneously, not only can alleviate the pressure of pts system installing space, also simplified system can design, improve production efficiency, are substantially reduced cost.Fine design, optimizing formula, the integer catalyzer of segmentation coating reaches the control effect of multiple catalysts.
For reaching above-mentioned technique effect, the technical scheme is that
The manufacture method of a kind of high-efficiency ternary catalyst coating, described coating is divided into internal layer coating and outer coating；Carrier is divided into leading portion and back segment to be coated respectively along air current flow direction by one layer of coating of at least a part of which, and the coating material of leading portion coating is different from the coating material that back segment applies and/or coating amount is different；The coating material of internal layer coating coating is different from the coating material that outer coating applies；After leading portion has applied, carry out back segment coating immediately, then carry out roasting；Coating material includes activator raw material and major catalyst element.
Further improving, the length of described leading portion and the length ratio of back segment are 1:2-2:1.
Further improving, total coating number of times is less than 4 times；Total roasting number of times is less than 2 times.
Further improving, described manufacture method applies scheme or the third coating scheme for the first coating scheme or the second；
The first coating scheme described is: the coating of internal layer entirety carries out first time coating, is coated first time roasting immediately；Carrier is divided into leading portion and back segment by outer coating along air current flow direction；Second time coating covers leading portion, and third time coating covers back segment, carries out second time roasting, molding；
Described the second coating scheme is: carrier is divided into leading portion and back segment by internal layer coating along air current flow direction；First time coating covers leading portion, and second time coating covers back segment, carries out first time roasting；Third time coating is outer coating, carries out second time roasting after third time coating；The length of outer coating is less than the length of carrier；
The third coating scheme described is: internal layer coating and outer coating all just carrier is divided into leading portion and back segment along air current flow direction, and wherein first time coating and second time coating are internal layer coating；Third time coating and the 4th coating are outer coating；First time coating covers leading portion, and second time coating covers back segment, carries out first time with roasting；Third time coating covers leading portion, and the 4th coating covers back segment, carries out second time roasting；Coating material used by four coatings all differs.
Further improving, described manufacture method is the second coating scheme, and wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element；The proportioning of activator raw material is: 45wt% aluminium oxide, 18wt%ZrO2, 27wt%CeO2、La2O3、Y2O3, NiO, BaO, wherein La2O3、Y2O3, NiO and BaO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 130g/L, and the load capacity of major catalyst element is 2.26g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 45wt% aluminium oxide, 18wt%ZrO2, 27wt%CeO2、La2O3、Y2O3, NiO, BaO, wherein La2O3、Y2O3, NiO and BaO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 80g/L, and the load capacity of major catalyst element is 0.74g/L；
Third time coating covers the intersection of leading portion and back segment；The coating material that third time coating uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 10wt% aluminium oxide, 55wt%ZrO2, 25wt%CeO2、La2O3、Y2O3, wherein La2O3And Y2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With whole volume computing of carrier, the coating carried amount of coating material of third time coating is 80g/L, and the load capacity of major catalyst element is 0.089g/L；
Further improving, described manufacture method is the second coating scheme；Wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element；The proportioning of activator raw material is: 46wt% aluminium oxide, 29wt%ZrO2, 15wt%CeO2、La2O3、Nd2O3, PrO, NiO, wherein La2O3、Nd2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 125g/L, and the load capacity of major catalyst element is 1.77g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 42wt% aluminium oxide, 18wt%ZrO2, 30wt%CeO2、La2O3、Yi2O3, PrO, NiO, wherein La2O3、Yi2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 125g/L, and the load capacity of major catalyst element is 0.61g/L；
Third time coating covers carrier front end and plays the length of 3/4ths；The coating material that third time coating uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 42wt%ZrO2, 30wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With whole volume computing of carrier, the coating carried amount of coating material of second time coating is 70g/L, and the load capacity of major catalyst element is 0.166g/L.
Further improving, described manufacture method is the third coating scheme；Wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 42wt% aluminium oxide, 18wt%ZrO2, 30wt%CeO2、La2O3、Yi2O3, PrO, NiO, wherein La2O3、Yi2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 125g/L, and the load capacity of major catalyst element is 0.61g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element；The proportioning of activator raw material is: 46wt% aluminium oxide, 29wt%ZrO2, 15wt%CeO2、La2O3、Nd2O3, PrO, NiO, wherein La2O3、Nd2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 125g/L, and the load capacity of major catalyst element is 1.77g/L；
Third time coating covers the coating material that leading portion uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 42wt%ZrO2, 30wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the coating carried amount of coating material of third time coating is 70g/L, and the load capacity of major catalyst element is 0.083g/L；
4th coating covers the coating material that back segment uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 67wt%ZrO2, 5wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of the 4th coating is 70g/L, and the load capacity of major catalyst element is 0.083g/L.
Further improving, described aluminium oxide is modified aluminas.
Further improving, the particle diameter of described internal layer coated coating is 3～20 microns and ranges for 0.1～0.5cc/g with pore volume, and the particle diameter of outer coating coating is 8～25 microns and ranges for 0.3～0.7cc/g with pore volume.
nullThe present invention will play the catalytic elements of not same-action、The coating material that auxiliary agent and multiple coating oxidation thing are formed，According to CO、Oxidation and the reduction control mechanism of HC and NOx are combined，Identical carrier carries out segmentation, and (segmentation ratio is classified as 1:2、1:1 or 2:1 is not etc.)、Layering (nexine top layer mass loading is than row 2:1 or 1:1) coating，The inside and outside group technology of two-layer (three or four coatings) after baking molding，Obtain along carrier axially (airflow direction) diverse tail gas control characteristic，Make the reduction process removing nitrogen oxides (NOx) and remove Hydrocarbon (HC)、The oxidizing process of carbon monoxide (CO) definite sequence on request occurs，Utilize catalyst activity most effectively，Improve high-temperature aging resisting performance simultaneously、Avoid the alloying shortcoming of different precious metal alloys and noble metal and coating metal oxide material，Strengthen the design flexibility of catalyst，Reach the optimal effectiveness to auto-emission control.
Accompanying drawing explanation
Figure 1A is the external structure schematic diagram of the first coating scheme；
Figure 1B is the first coating scheme side structure schematic diagram；
Fig. 2 A is the second coating a kind of structural representation outside scheme；
Fig. 2 B is the second coating another kind of structural representation outside scheme；
Fig. 3 A be the third coating scheme internal layer structural representation；
Fig. 3 B is the structural representation of the third coating scheme outer layer.
Wherein, front end 1, rear end 2, internal layer 3, outer layer 4.
Detailed description of the invention
Below by way of detailed description of the invention and in conjunction with accompanying drawing, technical scheme is illustrated.
Figure 1A and Figure 1B is the first coating scheme of the present invention.1st painting is the coating of internal layer entirety, is coated roasting immediately.Then the 2nd it is coated with: the half carrier of outer layer coating upstream extremity, carries out the 3rd painting immediately at once: the half carrier in outer layer downstream, then roasting molding.2 roasting manufacturing process of whole 3 coatings, bottom 1 is coated with and top layer 2,3 coating adopts activator raw material, catalytic elements concentration and formula are all different, reach to optimize catalytic control characteristic requirements, in addition it is also necessary to be adjusted according to the Drainage feature of concrete vehicle.Coating material (coating material) includes dominant catalyst element (main catalytic element) and activator raw material.
Fig. 2 A and the second coating scheme that Fig. 2 B is the present invention.One is coated with half section, mulching air-flow upstream carrier, and two are coated with half section of carrier in mulching downstream, are painted with roasting molding.Then carrying out the adjustable coating of outer length, its length can determine as required.Therefore interlude can have overlapping coverage areas, and concrete overlay segment length can control to require to determine according to tail gas.So, coating catalysis characteristics three kinds different axially actually it is the formation of along carrier.
Fig. 3 A and Fig. 3 B is the third coating scheme of the present invention.One painting is coated with identical with the second coating scheme with two, carries out the three, the 4th catalyst coated after roasting.So, the actual catalyst formulation coating material that can use four kinds of different catalysis strategies, can the function optimization combination aoxidizing in three-way catalyst, reducing, it is likely in the Catalyst Design that catalyst (as the NOxadsorber technology in gasoline direct igniter motor GDI) for special purposes is introduced single carrier simultaneously, brings huge motility to design.
Coating method described in the invention, it is desirable to redesign to reach higher coating precision to the catalyst metering system of coating machine equipment.Also must be coated with lower semisection at once after first half section slurry (activator raw material) has been coated with, it is ensured that the accurate realization of design philosophy simultaneously.It is that this technology cannot be implemented that first half section has been coated with the greatest problem not carrying out second half section coating at once, because the coating of first paragraph can penetrate into second segment, causes that second segment cannot precisely feeding and control.The coated technique of the present invention is unlike traditional standard complex process but can reach the tail gas control effect that traditional handicraft does not reach.Controlled in order to ensure concise in technology, cost, the present invention adopts at most four coatings, but which kind of situation all only need to adopt double roasting and plastic, and roasting is link the most consuming time in three-way catalyst making moulding process, cost is also higher.
Embodiment 1
Applying the catalyst carrier that three sections two layers two roasting coating scheme described in the second coating scheme of the present invention make, cylindrical, hole density is 600cpsi (per square inch hole count), and diameter is 105.7mm, and length is 130.0, and volume is 1.14 liters.
(one of the second coating scheme as shown in Figure 2 B) ground floor one section (half section, upstream) catalyst coat material, for the formula of hydrocarbon (HC) emission control under engine cold-start operating mode, adopting the precious metal palladium (Pd) of load capacity 2.26g/L as dominant catalyst element, coating material load capacity is 130g/L (calculating with half carrier bulk).Activator raw material is aluminium oxide (45wt%), cerium zirconium composite solid solution (18wt%ZrO2, 27wt%CeO2).All the other (La2O3、Y2O3, NiO, BaO) etc. oxide 10wt%；
The three-element catalytic agent prescription that ground floor two-stage nitration (half section of downstream) catalyst coat material adopts, palladium rhodium total load amount is 0.74g/L (palladium rhodium proportioning is 6:1).Coating material load capacity is 130g/L (calculating with half carrier bulk).Activator raw material is aluminium oxide (45wt%), cerium zirconium composite solid solution (18wt%ZrO2, 27wt%CeO2).All the other (La2O3、Y2O3, NiO, BaO) etc. oxide 10wt%；The CeO2 of ground floor higher percent is as the hydrogen-storing material in coating, its effect can make oxygen content fluctuating margin in the tail gas that air-fuel ratio fluctuation in combustion system of engine (particularly under the transient condition of electromotor) causes reduce, make three-way catalyst be operated in the Lambda window area of the best as far as possible, reach best oxidoreduction effect.
2nd layer the 3rd section (outer layer) is cover the external coating on internal layer.With the rhodium of low-load amount (0.089g/L) for precious metal catalyst element, coating material load capacity is 80g/L (calculating with whole carrier bulk), based on the zirconium oxide of high temperature resistance, activator raw material is aluminium oxide (10wt%), cerium zirconium composite solid solution (55wt%ZrO2, 25wt%CeO2), all the other (La2O3、Y2O3) etc. oxide 10wt%.Response hierarchy first makes full use of oxidized before carbon monoxide (CO), Hydrocarbon (HC) reducing agent effect thus strengthening the reduction process of nitrogen oxides (NOx).Due at outer layer, coating material sintering not only can affect self performance more can directly result in directly contacting of internal layer coating and gas molecule, and therefore the performance of outer layer high-temperature aging resisting and high temperature sintering is even more important.
The raw material of above-mentioned each coating and deionization soften water and mixs and be respectively applied after mechanical milling process is made and washed activator raw material (washcoat).The whole catalyst carrier palladium rhodium noble-metal-supported amount proportioning made is 10:1.
Embodiment 2
Apply the catalyst carrier that two layers of two roasting coating scheme (one of first scheme) of three shown in Fig. 2 A of the present invention section make, cylinder, hole density is 600cpsi (per square inch hole count), and diameter is 93.0mm, length is 101.6, and volume is 0.69 liter.
Ground floor one section (half section, upstream) catalyst coat material, for the formula of hydrocarbon (HC) emission control under engine cold-start operating mode, adopting the precious metals pd (～1.77g/L) that load capacity is higher as dominant catalyst element, total coating material load capacity is 125g/L.Activator raw material is aluminium oxide (46wt%), cerium zirconium composite solid solution (29wt%ZrO2, 15wt%CeO2).All the other (La2O3、Nd2O3, PrO, NiO) etc. oxide 10wt%；
The three-element catalytic agent prescription that ground floor two-stage nitration (half section of downstream) catalyst coat material adopts, palladium rhodium total load amount is 0.61g/L (palladium rhodium proportioning is 6:1).Coating material load capacity is 125g/L (calculating with half carrier bulk).Activator raw material is aluminium oxide (42wt%), cerium zirconium composite solid solution (18wt%ZrO2, 30wt%CeO2).All the other (La2O3、Yi2O3, PrO, NiO) etc. oxide 10wt%；The CeO2 of ground floor higher percent is as the hydrogen-storing material in coating, its effect can make oxygen content fluctuating margin in the tail gas that air-fuel ratio fluctuation in combustion system of engine (particularly under the transient condition of electromotor) causes reduce, make three-way catalyst be operated in the Lambda window area of the best as far as possible, reach best oxidoreduction effect.
2nd layer the 3rd section (outer layer) is cover top trip on internal layer to cover the external coating of 3/4 carrier.With the rhodium of low-load amount (0.166g/L) for precious metal catalyst element, coating material load capacity is 70g/L (calculating with whole carrier bulk), based on the zirconium oxide of high temperature resistance, activator raw material is aluminium oxide (18wt%), cerium zirconium composite solid solution (42wt%ZrO2, 30wt%CeO2), all the other (La2O3、PrO、Yi2O3) etc. oxide 10wt%.Response hierarchy first makes full use of oxidized before carbon monoxide (CO), Hydrocarbon (HC) reducing agent effect thus strengthening the reduction process of nitrogen oxides (NOx).Due at outer layer, coating material sintering not only can affect self performance more can directly result in directly contacting of internal layer coating and gas molecule, and therefore the performance of outer layer high-temperature aging resisting and high temperature sintering is even more important.
Above-described embodiment is passable as required, it is possible to the length of leading portion and the length ratio of back segment are adjusted, it is preferred to 1:2-2:1.
Embodiment 3
This example is the petrol engine of major control object mainly for nitrogen oxides in automobile exhaust composition.Applying the catalyst carrier that 4 sections two layers two roasting coating scheme of the present invention make, cylindrical, hole density is 600cpsi (per square inch hole count), and diameter is 93.0mm, and length is 101.6, and volume is 0.69 liter.
As shown in figs.3 a and 3b, ground floor one section (half section, upstream) catalyst coat material adopts the three-element catalytic agent prescription of standard, and palladium rhodium total load amount is 0.61g/L (palladium rhodium proportioning is 6:1).Coating material load capacity is 125g/L (calculating with half section, upstream carrier bulk).Activator raw material is aluminium oxide (42wt%), cerium zirconium composite solid solution (18wt%ZrO2, 30wt%CeO2).All the other (La2O3、Yi2O3, PrO, NiO) etc. oxide 10wt%.The CeO of ground floor higher percent2As the hydrogen-storing material in coating, its effect can make oxygen content fluctuating margin in the tail gas that air-fuel ratio fluctuation in combustion system of engine (particularly under the transient condition of electromotor) causes reduce, make three-way catalyst be operated in the Lambda window area of the best as far as possible, reach best oxidoreduction effect.
Ground floor two-stage nitration (half section of downstream) catalyst coat material, for the formula of hydrocarbon (HC) emission control under engine cold-start operating mode, adopting the precious metals pd (～1.77g/L) that load capacity is higher as dominant catalyst element, coating material load capacity is 125g/L (calculating with the cumulative volume of half section of downstream i.e. 1/2 carrier of carrier bulk).Activator raw material is aluminium oxide (46wt%), cerium zirconium composite solid solution (29wt%ZrO2, 15wt%CeO2).All the other (La2O3、Nd2O3, PrO, NiO) etc. oxide 10wt%.
2nd layer the 3rd section (outer layer) is the external coating covering half section, internal layer upstream.With the rhodium of low-load amount (0.083g/L) for precious metal catalyst element, coating material load capacity is 70g/L (calculating with half section, upstream carrier bulk), based on the zirconium oxide of high temperature resistance, activator raw material is aluminium oxide (18wt%), cerium zirconium composite solid solution (42wt%ZrO2, 30wt%CeO2), all the other (La2O3、PrO、Yi2O3) etc. oxide 10wt%；Noble metal Rh is 0.0285g.Response hierarchy first makes full use of oxidized before carbon monoxide (CO), Hydrocarbon (HC) reducing agent effect thus strengthening the reduction process of nitrogen oxides (NOx).Due at outer layer, coating material sintering not only can affect self performance more can directly result in directly contacting of internal layer coating and gas molecule, and therefore the performance of outer layer high-temperature aging resisting and high temperature sintering is even more important.
2nd layer the 4th section (outer layer) is the external coating covering half section of internal layer downstream.The rhodium using low-load (0.083g/L) equally is precious metal catalyst element.This section of coating is exhaust gas flow downstream, in the tail gas that air-fuel ratio causes, oxygen content fluctuation has utilized the oxygen storage capacity of the half section of coating in upstream fully to be regulated so as to be in the air-fuel ratio hatch section of the best, therefore this section of coating does not use the cerium oxide composition of oxygen storage capacity substantially, as far as possible based on zirconium oxide that high-temperature resistance is strong.This coating material load capacity is 70g/L (calculating with half section of downstream carrier bulk), and activator raw material is aluminium oxide (18wt%), cerium zirconium composite solid solution (67wt%ZrO2, 5wt%CeO2), all the other (La2O3、PrO、Yi2O3) etc. oxide 10wt%；Noble metal Rh is 0.0285g.Response hierarchy first makes full use of oxidized before carbon monoxide (CO), Hydrocarbon (HC) reducing agent effect thus strengthening nitrogen oxides (NOx) reduction process, be that nitrogen oxides obtains reducing the most fully, convert nitrogen (N to2), water (H2And carbon dioxide (CO O)2).Due at outer layer, coating material sintering not only can affect self performance more can directly result in directly contacting of internal layer coating and gas molecule, and therefore the performance of outer layer high-temperature aging resisting and high temperature sintering is even more important.
All example internal layer coating powder particle sizes and pore volume are less than outer coating powder particle size and pore volume above.So be conducive to exhaust gas molecule to have more chance pass through micropore and particulate interspaces entrance internal layer coating and fully act on catalyst, and still have enough micropores and space after being also beneficial to experience high temperature sintering, reach best high temperature resistant and lasting effect.The particle diameter of interlayer coatings and pore volume range for 3～20 microns and 0.1～0.5cc/g, and the particle diameter of outer coating and pore volume range for 8～25 microns and 0.3～0.7cc/g.
Aluminium oxide used in above-described embodiment, can be adjusted to modified aluminas, and can as required (particle diameter of coating and space scope), select to use different modified aluminas.
The raw material of above-mentioned each coating and deionization soften water and mixs and be respectively coated with after mechanical milling process is made and washed slurry (washcoat).Modified aluminas system used adopts gamma phase alumina powder, and specific surface area scope is at 150～250 every gram square metre, by adding the rare earths such as lanthanum, yttrium, neodymium, praseodymium or the oxide modifying relevant to rare earth lifting high-temperature aging resisting ability.
Leading portion and back segment length ratio range preferably from 1:2-2:1, can be adjusted according to numerical value such as the concrete length of carrier.
Embodiment 1 result
Table 1 is the catalyst initiation temperature experimental result after 100 hours quick high-temps are aging on car engine rack made according to present example 1.
Table 2 be this 100 hours quick high-temp of example 1 catalyst aging after under the atmosphere that Lambda is 1 carbon monoxide, Hydrocarbon and transformation efficiency of the oxides of nitrogen experimental result.
Table 3 is embodiment car load durability experiment result.Meet discharging standards.The catalyst made with traditional standard coating method is compared, and adopts its performance of catalyst sample of the inventive method coating to meet or exceed original catalyst sample.
Embodiment 2 result
Table 4 is the durable emission test results of entrucking.Compared with original-pack catalyst, noble metal amount used by example 2 reduces 10%, but performance has surmounted original-pack catalyst, still meets discharging standards admirably.
Table 1-initiation temperature result of the test (after 100 hours high temperature ageings of catalyst)
| Catalyst sample | CO | HC | NOx |
| Inventive samples | 322℃ | 324℃ | 326℃ |
| Former press proof product | 358℃ | 350℃ | 355℃ |
Conversion ratio result of the test when table 2-sky is so 1 than (Lambda)
| Catalyst sample | CO | HC | NOx |
| Inventive samples | 99.5% | 92.5% | 96.5% |
| Former press proof product | 98.0% | 89.0% | 93.4% |
Ten thousand kilometers of durable emission testings of car load of table 3-8
48 ten thousand kilometers of durable emission testings of table
Above are only the concrete guiding embodiment of the present invention, but the design concept of the present invention is not limited thereto, all changes utilizing this design that the present invention carries out unsubstantiality, the behavior invading protection scope of the present invention all should be belonged to.
Claims (9)
1. the manufacture method of a high-efficiency ternary catalyst coating, it is characterised in that described coating is divided into internal layer coating and outer coating；Carrier is divided into leading portion and back segment to be coated respectively along air current flow direction by one layer of coating of at least a part of which, and the coating material of leading portion coating is different from the coating material that back segment applies and/or coating amount is different；The coating material of internal layer coating coating is different from the coating material that outer coating applies；After leading portion has applied, carry out back segment coating immediately, then carry out roasting；Coating material includes activator raw material and major catalyst element.
2. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 1, it is characterised in that the length of described leading portion and the length ratio of back segment are 1:2-2:1.
3. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 1, it is characterised in that total coating number of times is less than 4 times；Total roasting number of times is less than 2 times.
4. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 1, it is characterised in that described manufacture method applies scheme or the third coating scheme for the first coating scheme or the second；
The first coating scheme described is: the coating of internal layer entirety carries out first time coating, is coated first time roasting immediately；Carrier is divided into leading portion and back segment, second time coating to cover leading portion by outer coating along air current flow direction, and third time coating covers back segment, carries out second time roasting, molding；
Described the second coating scheme is: carrier is divided into leading portion and back segment by internal layer coating along air current flow direction；First time coating covers leading portion, and second time coating covers back segment, carries out first time roasting；Third time coating is outer coating, carries out second time roasting after third time coating；The length of outer coating is less than the length of carrier；
The third coating scheme described is: internal layer coating and outer coating all just carrier is divided into leading portion and back segment along air current flow direction, and wherein first time coating and second time coating are internal layer coating；Third time coating and the 4th coating are outer coating；First time coating covers leading portion, and second time coating covers back segment, carries out first time with roasting；Third time coating covers leading portion, and the 4th coating covers back segment, carries out second time roasting；Coating material used by four coatings all differs.
5. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 4, it is characterised in that described manufacture method is the second coating scheme, and wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element；The proportioning of activator raw material is: 45wt% aluminium oxide, 18wt%ZrO2, 27wt%CeO2、La2O3、Y2O3, NiO, BaO, wherein La2O3、Y2O3, NiO and BaO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 130g/L, and the load capacity of major catalyst element is 2.26g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 45wt% aluminium oxide, 18wt%ZrO2, 27wt%CeO2、La2O3、Y2O3, NiO, BaO, wherein La2O3、Y2O3, NiO and BaO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 80g/L, and the load capacity of major catalyst element is 0.74g/L；
Third time coating covers the intersection of leading portion and back segment；The coating material that third time coating uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 10wt% aluminium oxide, 55wt%ZrO2, 25wt%CeO2、La2O3、Y2O3, wherein La2O3And Y2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With whole volume computing of carrier, the coating carried amount of coating material of third time coating is 80g/L, and the load capacity of major catalyst element is 0.089g/L；
With the volume computing of whole carriers, the load capacity of palladium element: the load capacity=10:1 of rhodium element.
6. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 4, it is characterised in that described manufacture method is the second coating scheme；Wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element；The proportioning of activator raw material is: 46wt% aluminium oxide, 29wt%ZrO2, 15wt%CeO2、La2O3、Nd2O3, PrO, NiO, wherein La2O3、Nd2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 125g/L, and the load capacity of major catalyst element is 1.77g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 42wt% aluminium oxide, 18wt%ZrO2, 30wt%CeO2、La2O3、Yi2O3, PrO, NiO, wherein La2O3、Yi2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 125g/L, and the load capacity of major catalyst element is 0.61g/L；
Third time coating covers carrier front end and plays the length of 3/4ths；The coating material that third time coating uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 42wt%ZrO2, 30wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With whole volume computing of carrier, the coating carried amount of coating material of second time coating is 70g/L, and the load capacity of major catalyst element is 0.166g/L.
7. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 4, it is characterised in that described manufacture method is the third coating scheme；Wherein the length of leading portion is 1:1 with the length ratio of back segment:
First time coating covers the coating material that leading portion uses: major catalyst element is palladium element and rhodium element, and the mass ratio of palladium element and rhodium element is 6:1；The proportioning of activator raw material is: 42wt% aluminium oxide, 18wt%ZrO2, 30wt%CeO2、La2O3、Yi2O3, PrO, NiO, wherein La2O3、Yi2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the first time coating carried amount of coating material of coating is 125g/L, and the load capacity of major catalyst element is 0.61g/L；
Second time coating covers the coating material that back segment uses: major catalyst element is palladium element；The proportioning of activator raw material is: 46wt% aluminium oxide, 29wt%ZrO2, 15wt%CeO2、La2O3、Nd2O3, PrO, NiO, wherein La2O3、Nd2O3, PrO and NiO mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of second time coating is 125g/L, and the load capacity of major catalyst element is 1.77g/L；
Third time coating covers the coating material that leading portion uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 42wt%ZrO2, 30wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of leading portion carrier, the coating carried amount of coating material of third time coating is 70g/L, and the load capacity of major catalyst element is 0.083g/L；
4th coating covers the coating material that back segment uses: major catalyst element is rhodium element；The proportioning of activator raw material is: 18wt% aluminium oxide, 67wt%ZrO2, 5wt%CeO2、La2O3、PrO、Yi2O3, wherein La2O3, PrO and Yi2O3Mass fraction be 10wt% than sum；ZrO2And CeO2Form cerium zirconium composite solid solution；With the volume computing of back segment carrier, the coating carried amount of coating material of the 4th coating is 70g/L, and the load capacity of major catalyst element is 0.083g/L.
8. the manufacture method of the high-efficiency ternary catalyst coating as described in as arbitrary in claim 5-7, it is characterised in that described aluminium oxide is modified aluminas.
9. the manufacture method of high-efficiency ternary catalyst coating as claimed in claim 1, it is characterised in that the particle diameter of described internal layer coated coating is 3～20 microns and ranges for 0.1～0.5cc/g with pore volume；The particle diameter of outer coating coating is 8～25 microns and ranges for 0.3～0.7cc/g with pore volume.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108126698A (en) * | 2018-01-05 | 2018-06-08 | 无锡威孚环保催化剂有限公司 | A kind of selective cleaning three-way catalyst and preparation method thereof |
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| CN110785230A (en) * | 2017-04-28 | 2020-02-11 | 优美科触媒日本有限公司 | Exhaust gas purifying catalyst and exhaust gas purifying method using same |
| CN110785230B (en) * | 2017-04-28 | 2022-09-23 | 优美科触媒日本有限公司 | Exhaust gas purifying catalyst and exhaust gas purifying method using same |
| CN108126698A (en) * | 2018-01-05 | 2018-06-08 | 无锡威孚环保催化剂有限公司 | A kind of selective cleaning three-way catalyst and preparation method thereof |
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| CN113019363A (en) * | 2021-03-23 | 2021-06-25 | 中自环保科技股份有限公司 | Tail gas treatment catalyst and application thereof |
| CN113019363B (en) * | 2021-03-23 | 2022-10-28 | 中自环保科技股份有限公司 | Tail gas treatment catalyst and application thereof |
| CN116510747A (en) * | 2023-06-29 | 2023-08-01 | 中汽研汽车检验中心（天津）有限公司 | Three-way catalyst and preparation method thereof |
| CN116510747B (en) * | 2023-06-29 | 2023-10-10 | 中汽研汽车检验中心（天津）有限公司 | Three-way catalyst and preparation method thereof |
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