CN115999541A - Exhaust gas purifying catalyst and preparation method and application thereof - Google Patents
Exhaust gas purifying catalyst and preparation method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title abstract description 4
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 239000011148 porous material Substances 0.000 claims abstract description 35
- 239000011230 binding agent Substances 0.000 claims abstract description 26
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000011247 coating layer Substances 0.000 claims abstract description 7
- 239000002002 slurry Substances 0.000 claims description 28
- 239000007789 gas Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical group [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 4
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 4
- PLDDOISOJJCEMH-UHFFFAOYSA-N neodymium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Nd+3].[Nd+3] PLDDOISOJJCEMH-UHFFFAOYSA-N 0.000 claims description 4
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 4
- 229910000314 transition metal oxide Inorganic materials 0.000 claims description 4
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 3
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 2
- 229910000428 cobalt oxide Inorganic materials 0.000 claims description 2
- IVMYJDGYRUAWML-UHFFFAOYSA-N cobalt(ii) oxide Chemical compound [Co]=O IVMYJDGYRUAWML-UHFFFAOYSA-N 0.000 claims description 2
- 239000002808 molecular sieve Substances 0.000 claims description 2
- 229910000480 nickel oxide Inorganic materials 0.000 claims description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 2
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- MMKQUGHLEMYQSG-UHFFFAOYSA-N oxygen(2-);praseodymium(3+) Chemical compound [O-2].[O-2].[O-2].[Pr+3].[Pr+3] MMKQUGHLEMYQSG-UHFFFAOYSA-N 0.000 claims description 2
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 2
- 229910003447 praseodymium oxide Inorganic materials 0.000 claims description 2
- 229910001954 samarium oxide Inorganic materials 0.000 claims description 2
- 229940075630 samarium oxide Drugs 0.000 claims description 2
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims description 2
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 2
- 239000011232 storage material Substances 0.000 claims description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000000746 purification Methods 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 5
- 230000001070 adhesive effect Effects 0.000 abstract description 4
- 239000000853 adhesive Substances 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 21
- 239000000843 powder Substances 0.000 description 14
- 229910052878 cordierite Inorganic materials 0.000 description 9
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 9
- 238000000498 ball milling Methods 0.000 description 7
- 239000007787 solid Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 238000005470 impregnation Methods 0.000 description 6
- 239000002202 Polyethylene glycol Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 5
- 229920001223 polyethylene glycol Polymers 0.000 description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- DDPNPTNFVDEJOH-UHFFFAOYSA-N [O-2].[Zr+4].[O-2].[Ce+3] Chemical compound [O-2].[Zr+4].[O-2].[Ce+3] DDPNPTNFVDEJOH-UHFFFAOYSA-N 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 102220043159 rs587780996 Human genes 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Images
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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
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Abstract
The invention relates to an exhaust gas purifying catalyst, a preparation method and application thereof. The waste purification catalyst comprises: a substrate and a coating layer on the substrate, wherein the coating layer comprises a catalytic component and a binder component; pore volume V of pore diameter smaller than 300nm in the coating 1 And pore volume V greater than or equal to 300nm 2 Ratio V of 1 /V 2 Between 0.1 and 5. The invention regulates and controls the influence on the adhesive property of the catalyst coating by controlling the ratio of the particle sizes of the adhesive and the catalytic performance component, and the coating has the specific obtained pore size distribution, thereby improving the performance of the catalyst.
Description
Technical Field
The invention relates to an exhaust gas purifying catalyst, a preparation method and application of the catalyst.
Background
The monolithic catalyst has wide application in the purification of tail gas of mobile sources and fixed sources. Such catalysts are typically formed by coating a surface of a monolith substrate with a catalytically active component to form a catalyst coating having a thickness of from about ten to several tens of micrometers. Thus, the nature of the catalyst coating will significantly affect the macroscopic performance exhibited by the catalyst.
Taking the pore structure of the catalyst coating as an example, the different pore size distribution has a significant effect on the multistage diffusion of the gas phase components from the boundary to the interior of the coating and further to the catalytically active sites. Experiments and simulations by Marek et al demonstrate that the presence of micro macropores helps to increase the diffusion coefficient with the gas phase components and promote the catalytic oxidation of CO when certain gaps and voids exist between the particles in the coating.
Disclosure of Invention
The object of the present invention is to provide an exhaust gas purifying catalyst, which aims at the problems of the prior art. The catalyst comprises a catalytic performance component and a binder component, can improve the cohesiveness of a catalyst coating and prolong the service life of the catalyst.
In one aspect of the present invention, there is provided an exhaust gas purifying catalyst comprising: a substrate and a coating layer on the substrate, wherein the coating layer comprises a catalytic component and a binder component; pore volume V of pore diameter smaller than 300nm in the coating 1 And pore volume V greater than or equal to 300nm 2 Ratio V of 1 /V 2 Between 0.1 and 5.
According to some preferred embodiments of the invention, V 1 /V 2 0.5-5. In some embodiments, V 1 /V 2 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, 1.8, 2.0, 2.2, 2.5, 2.8, 3.0, 3.5, 3.8, 4.0, 4.5, 4.8, etc.
According to some embodiments of the invention, the D50 of the catalytic performance component is between 0.1 μm and 15 μm, preferably between 1 μm and 15 μm. In some embodiments, the D50 of the catalytic performance component is 1 μm, 5 μm, 10 μm, 15 μm.
Those skilled in the art know that D50 refers to a particle size with a cumulative distribution of particles of 50%, also known as median or median particle size.
According to some embodiments of the invention, the catalytic performance component comprises one or more of an oxide comprising alumina, a platinum group metal, a molecular sieve, an oxygen storage material comprising ceria. In some embodiments, the catalytic performance component includes Pt, la, and Al 2 O 3 。
According to some embodiments of the invention, the binder component comprises a binder selected from the group consisting of Al 2 O 3 、SiO 2 、TiO 2 One or more of transition metal oxides and rare earth metal oxides.
According to some embodiments of the invention, the transition metal oxide is one or more of zirconium oxide, iron oxide, nickel oxide, cobalt oxide.
According to some embodiments of the invention, the rare earth metal oxide is one or more of cerium oxide, lanthanum oxide, neodymium oxide, yttrium oxide, praseodymium oxide, and samarium oxide.
According to some embodiments of the invention, the binder component comprises 1% to 50%, preferably 5% to 20% by mass of the coating. In some embodiments, the binder component comprises 5%, 10%, 15%, 18%, 20%, etc., by mass of the coating.
According to some embodiments of the invention, the thickness of the coating is in the range of 10 μm to 200 μm.
According to some embodiments of the invention, the substrate comprises a honeycomb structure having parallel cells, a corrugated board structure, or a foam structure with 3-dimensional cells in communication. In some preferred embodiments, the substrate is a cordierite honeycomb carrier.
In a second aspect of the present invention, there is provided a method for preparing a waste purification catalyst as described above, comprising the steps of: s1, preparing slurry A with a catalytic component; s2, dispersing the binder component in the slurry A to obtain slurry B; s3, coating the slurry B on the surface of a substrate to obtain a catalyst, wherein the ratio of D50 of the binder component used in the step S2 to D50 of the catalytic performance component used in the step S1 is less than or equal to 1:50.
according to some embodiments of the invention, the ratio of D50 of the binder component used in step S2 to D50 of the catalytic component used in step S1 is 0.001:1 to 0.02:1. in some embodiments, the ratio of D50 of the binder component used in step S2 to D50 of the catalytic performance component used in step S1 is 0.0012: 1. 0.0024: 1. 0.003: 1. 0.004: 1. 0.005: 1. 0.006: 1. 0.007: 1. 0.009: 1. 0.01: 1. 0.02:1, etc.
According to some embodiments of the invention, the D50 of the binder component used in step S2 is in the range of 0.001 μm to 0.2 μm (i.e. 1nm to 200 nm), preferably in the range of 0.01 μm to 0.2 μm (i.e. 10nm to 200 nm. In some embodiments, the D50 of the binder component used in step S2 is 10nm, 20nm, 30nm, 50nm, 80nm, 100nm, 120nm, 150nm, 180nm, etc.
According to some embodiments of the invention, the substrate comprises a honeycomb structure having parallel cells, a corrugated board structure, or a foam structure with 3-dimensional cells in communication. In some preferred embodiments, the substrate is a cordierite honeycomb carrier.
In a third aspect, the present invention also provides the use of the exhaust gas purifying catalyst as described above in an exhaust gas purifying process.
The invention regulates and controls the influence on the adhesive property of the catalyst coating by controlling the ratio of the particle sizes of the adhesive and the catalytic performance component, and the coating has the specific obtained pore size distribution, thereby improving the performance of the catalyst.
Drawings
Figure 1 shows the pore size distribution of the catalyst coating prepared according to example 1.
FIG. 2 shows the performance of the catalyst prepared in example 1 compared with that of comparative example 1.
Detailed Description
The present invention is further illustrated by, but not limited to, the following examples.
Example 1
Taking Pt/La-Al prepared by adopting an immersion method 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=9.3 μm. Then adding silica sol binder with particle size of 15.8nm, wherein the addition amount is 5% based on the total mass of the coating after roasting. And an organic aid polyethylene glycol is added to regulate the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Example 2
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=9.3 μm. Subsequently, a silica sol binder having a particle size of 27nm was added in an amount of 5% based on the total mass of the coating after firing. And an organic aid polyethylene glycol is added to regulate the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pores with a pore diameter of 300nm or moreV container 2 And the ratio thereof are shown in Table 1.
Example 3
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=9.3 μm. Then, a cerium oxide sol binder having a particle diameter of 89nm was added in an amount of 5% based on the total mass of the coating after firing. And an organic aid polyethylene glycol is added to regulate the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Example 4
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder is put into water for dispersion, and the agglomerated powder is ground and dispersed by a ball milling method, wherein D50=9.3 μm. Then, a cerium oxide-zirconium oxide sol binder having a particle diameter of 167nm was added in an amount of 5% based on the total mass of the coating after firing. And an organic aid polyethylene glycol is added to regulate the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Example 5
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=4.2 μm. Then adding silica sol binder with particle size of 15.8nm, adding the following steps of roastingThe total mass of the coating was 8%. And an organic aid polyethylene glycol is added to regulate the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Example 6
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=14.8 μm. Then, an aluminum sol binder having a particle diameter of 100nm was added in an amount of 5% based on the total mass of the coating after firing. And an organic auxiliary agent is added to adjust the stability of the catalyst slurry, wherein the addition amount is 2 percent of the total mass of the coating after roasting. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, and after drying, it was calcined at 550℃for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Comparative example 1
Taking Pt/La-Al prepared by impregnation method as in example 1 2 O 3 The catalyst powder (containing 1wt% pt element) was dispersed in water, and the agglomerated powder was ground and dispersed by ball milling, d50=4.1 μm. Then, an aluminum sol binder having a particle size of 200nm was added in an amount of 5% based on the total mass of the coating after firing. The solid content of the slurry was controlled to 27wt%, and then the slurry was coated on a cordierite honeycomb carrier having a pore density of 200 mesh, dried and calcined at 550 c for 4 hours to obtain a catalyst having a catalytically active coating. Wherein the pore volume V is less than 300nm 1 Pore volume V of 300nm or more 2 And the ratio thereof are shown in Table 1.
Application examples
In the application examples, toluene was used as a typical model compound, and the performance of the catalyst was evaluated by examining the removal efficiency of toluene, and specific gas compositions are shown in table 2.
The catalysts prepared in examples 1 to 6 and comparative example 1 were subjected to performance evaluation. The catalyst is placed in a fixed bed reactor, and the flow rate of the gas is controlled to ensure that the reaction space velocity is 20000h -1 Is a common airspeed in industrial applications. The purification efficiency of the catalyst means the purification efficiency of toluene in the gas, and is calculated according to the following formula:
X＝(c tn -c out )/c tn ×100％
wherein X is purification efficiency, C in Ppmv, the toluene concentration in the pre-reaction gas; c (C) out In order to obtain a toluene concentration in the tail gas after the reaction, ppmv.
In addition, T in Table 3 90 The reaction temperature is the reaction temperature corresponding to the purification efficiency reaching 90 percent. In the present invention, T is 90 The reaction temperature at which the purification efficiency of toluene reaches 90%.
TABLE 1
| V 1 (mL/g) | V 2 (mL/g) | V 1 /V 2 | |
| Example 1 | 0.065 | 0.097 | 0.67 |
| Example 2 | 0.071 | 0.077 | 0.92 |
| Example 3 | 0.086 | 0.040 | 2.15 |
| Example 4 | 0.088 | 0.037 | 2.31 |
| Example 5 | 0.076 | 0.082 | 0.93 |
| Example 6 | 0.058 | 0.102 | 0.57 |
| Comparative example 1 | 0.091 | 0.012 | 7.6 |
TABLE 2
| Content of | |
| Toluene (ppmv) | 2000 |
| H 2 O(vol％) | 5 |
| O 2 (vol％) | 10 |
| N 2 (vol％) | Balance air |
TABLE 3 Table 3
| Catalyst | GHSV(h -1 ) | T 90 (℃) |
| Example 1 | 20000 | 186 |
| Example 2 | 20000 | 190 |
| Example 3 | 20000 | 192 |
| Example 4 | 20000 | 200 |
| Example 5 | 20000 | 188 |
| Example 6 | 20000 | 187 |
| Comparative example 1 | 20000 | 206 |
It should be noted that the above-described embodiments are only for explaining the present invention and do not limit the present invention in any way. The invention has been described with reference to exemplary embodiments, but it is understood that the words which have been used are words of description and illustration, rather than words of limitation. Modifications may be made to the invention as defined in the appended claims, and the invention may be modified without departing from the scope and spirit of the invention. Although the invention is described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, as the invention extends to all other means and applications which perform the same function.
Claims (10)
1. An exhaust gas purifying catalyst comprising: a substrate and a coating layer on the substrate, wherein the coating layer comprises a catalytic component and a binder component; in the case of the coating layer,pore volume V smaller than 300nm 1 And pore volume V greater than or equal to 300nm 2 Ratio V of 1 /V 2 In the range of 0.1-5.
2. The catalyst of claim 1, wherein V 1 /V 2 In the range of 0.5-5.
3. Catalyst according to claim 1 or 2, characterized in that the D50 of the catalytic component is in the range of 0.1 μm to 15 μm, preferably in the range of 1 μm to 15 μm.
4. A catalyst according to any one of claims 1 to 3, wherein the catalytic performance component comprises one or more of an oxide comprising alumina, a platinum group metal, a molecular sieve, an oxygen storage material comprising ceria.
5. The catalyst of any one of claims 1-4, wherein the binder component comprises a metal selected from the group consisting of Al 2 O 3 、SiO 2 、TiO 2 One or more of transition metal oxides, rare earth metal oxides; preferably, the transition metal oxide is one or more of zirconium oxide, iron oxide, nickel oxide, cobalt oxide, and the rare earth metal oxide is one or more of cerium oxide, lanthanum oxide, neodymium oxide, yttrium oxide, praseodymium oxide, and samarium oxide.
6. Catalyst according to any one of claims 1 to 5, characterized in that the binder component is in the range of 1% to 50% by mass of the coating, preferably in the range of 5% to 20%.
7. The catalyst of any one of claims 1-6 wherein the substrate comprises a honeycomb structure having parallel cells, a corrugated plate structure, or a foam structure of 3-dimensional cell intercommunication.
8. A process for preparing a catalyst according to any one of claims 1 to 7, comprising the steps of:
s1, preparing slurry A with a catalytic component;
s2, dispersing the binder component in the slurry A to obtain slurry B;
s3, coating the slurry B on the surface of a substrate to obtain a catalyst,
wherein the ratio of the average particle diameter D50 of the binder component used in step S2 to the average particle diameter D50 of the catalytic performance component used in step S1 is less than or equal to 0.02:1, preferably 0.001:1 to 0.02:1.
9. the method of claim 8, wherein the D50 of the binder component used in step S2 is in the range of 0.001 μm to 0.2. Mu.m.
10. Use of the exhaust gas purifying catalyst according to any one of claims 1 to 7 or the exhaust gas purifying catalyst produced by the production method of claim 8 or 9 in an exhaust gas purifying process.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1932591A2 (en) * | 2006-12-15 | 2008-06-18 | Nissan Motor Co., Ltd. | Exhaust gas purging catalyst and method for producing the exhaust gas purging catalyst |
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