CN107715875B - GPF quaternary catalyst and preparation method thereof - Google Patents
GPF quaternary catalyst and preparation method thereof Download PDFInfo
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- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
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- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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Abstract
The invention discloses a GPF quaternary catalyst and a preparation method thereof. The catalyst coating is coated on the wall surface of a port at the air inlet end of the GPF carrier and comprises the following components in percentage by mass: 0-13% of catalytic metal oxide, 30-60% of activated alumina, 30-60% of rare earth-transition metal composite oxide, 0-3% of active component and the balance of binder; the active component comprises a first noble metal and an oxide of Rh, wherein the first noble metal is selected from Pd or Pt; the catalyst coating is formed by coating slurry obtained by mixing first noble metal and Rh catalyst powder formed by loading the first noble metal and Rh on active alumina and rare earth-transition metal composite oxide, and the coating amount is 30-70 g/L; the mass ratio of the active components is that: rh = 1-1.5:1, high precious metal content of 4-20g/ft and high Rh content of 3-15 g/ft. The invention can efficiently purify CO, HC, NOx and particulate matters while reducing the back pressure of the catalyst without blocking GPF ceramic channels, thereby realizing quaternary catalysis.
Description
Technical Field
The invention relates to the field of automobile exhaust emission, in particular to a GPF catalyst and a preparation method thereof.
Background
With the rapid development of the automobile industry in recent years, the life of people is facilitated, and meanwhile, the ecological environment is seriously damaged. The vehicle emission pollutants mainly include carbon monoxide (CO), Hydrocarbons (HC), nitrogen oxides (NOx), particulate matters, and the like. In order to limit the pollution of the automobile exhaust to the environment, a series of regulations are set by the state to regulate the emission limit.
With the release of GB18352.6-2016 light-duty vehicle pollutant emission limits and measurement methods (the sixth stage of China), the six national standards will be fully implemented from 7/1/2020. Compared with the GB18352.5-2013 light automobile pollutant emission limit and measurement method, the national standard five, six, more strict requirements, not only the CO and HC are tightened by about 30% on the basis of the national limit five, but also the control requirement on NOx is tightened, and simultaneously, the direct injection gasoline engine is required to be applied to each national standard fiveThe operating conditions are kept stable and low in Particulate Matter (PM) and particulate matter (PN). The emission standard of China 6a is that the PM limit value is 4.5mg/km and the PN limit value is 6.0 multiplied by 1011One per km; national 6b emission Standard, PM Limit of 3mg/km, PN Limit of 6.0 × 1011One per km.
To meet the requirements of the emissions limits of the nation, GPF becomes the standard configuration in gasoline engine after-treatment systems as a surface type particulate trap. Its importance will be equivalent to a diesel particulate trap (DPF) on a diesel engine. The filtering mechanism of GPF is basically the same as that of DPF, i.e. the exhaust gas passes through the porous wall surface at a certain flow rate, referred to as "wall flow". The filtering main body of the GPF wall-flow type trap consists of a plurality of square pore channels, adjacent pore channels are separated by thin-wall breathable ceramics, when the inlet of one pore channel is blocked, the outlet is open, and the outlets of the adjacent pore channels at the periphery are blocked. Due to the structure, when entering from the open pore channel, the tail gas can be discharged from the adjacent pore channel with the open outlet only through the air-permeable thin-wall ceramic, and the particulate matters in the tail gas are attached to the wall surface of the inlet channel, so that the purpose of trapping the particulate matters is achieved.
The research on GPF by international well-known companies such as NGK, Corning and Pasteur in Japan has made great progress, and some commercialized products have appeared; CN 203702290U is a cordierite wall-flow GPF disclosed by Wuweifu nationwide, and can effectively trap particulate matters in automobile exhaust. Although their research on GPF supports has gradually stepped into the mature stage, there has been little research on this aspect of GPF catalysts.
Disclosure of Invention
The invention aims to solve the technical problem and provides a GPF quaternary catalyst and a preparation method thereof. Carbon monoxide, hydrocarbon, oxynitride and particles can be effectively intercepted while GPF ceramic pore channels are not blocked and the back pressure of the catalyst is reduced.
The technical scheme of the invention is as follows: the invention relates to a GPF quaternary catalystThe catalyst comprises a GPF carrier and a catalyst coating, and is characterized in that: the catalyst coating is coated on the wall surface of a port at the air inlet end of the GPF carrier and comprises the following components in percentage by mass: the catalyst-promoting metal oxide is less than or equal to 13% and more than 0%, the activated alumina is 30-60%, the rare earth-transition metal composite oxide is 30-60%, the active component is less than or equal to 3% and more than 0%, and the balance is the binder; the active component comprises an oxide of a first noble metal selected from Pd or Pt and an oxide of a noble metal Rh; the catalyst coating is formed by coating slurry obtained by fully mixing first noble metal catalyst powder formed by loading a first noble metal on active alumina and a rare earth-transition metal composite oxide with Rh catalyst powder formed by loading Rh on the active alumina and the rare earth-transition metal composite oxide, wherein the coating amount is 30-70 g/L; the mass ratio of the active components is that: rh 1-1.5:1, the content of the first noble metal is 4-20g/ft3Rh content of 3-15g/ft3。
The first noble metal is Pd or Pt, is mainly used for converting CO and HC, and has the advantages of low price, rich resources, good heat resistance and the like; rh is a main component for controlling the content of nitrogen oxides, can effectively treat NOx, and has good durability and is not easy to be poisoned.
Further, in the GPF quaternary catalyst, the GPF carrier is a wall-flow filter and has the porosity of 50-70%. Therefore, when entering from the open pore channel of the GPF carrier, the tail gas can be discharged from the adjacent pore channel with the open outlet only through the ventilated thin-wall ceramic, and the particulate matters in the tail gas are attached to the wall surface of the inlet channel, so that the aims of particulate matter trapping and catalytic conversion can be efficiently achieved.
Furthermore, in the GPF quaternary catalyst, the catalytic metal oxide is selected from one or more of La, Ce, Zr, Fe, Mn, Ni and Ba oxides, and the function of the catalyst is to improve the thermal stability and mechanical strength of the carrier/active coating, inhibit the sintering of the catalyst and promote the uniform distribution of the catalyst.
Further, in the GPF quaternary catalyst of the invention, the catalyst isThe activated alumina is composite alumina containing 1-20% of dopant selected from La2O3、ZrO2、CeO2、Y2O3The specific surface area of the activated alumina is 120-200 square meters per gram, and the pore volume is 0.4-0.8 cc/g. The dopant is selected from rare earth-transition metal, so that the stability of the active alumina structure and the catalytic activity of base metal can be effectively improved.
Further, in the GPF quaternary catalyst of the present invention, the rare earth-transition metal composite oxide comprises the following components and contents: 40-60% ZrO2、20-50％CeO2、10-20％La2O3、0-10％Y2O3、0-10％Pr6O11、0-10％Nd2O3、0-10％MnO2、0-10％Sr2O3、0-10％Co2O3. The rare earth-transition metal composite oxide is used as an oxygen storage material, can achieve a good oxygen storage effect, and can supply oxygen in time when the air-fuel ratio changes; in addition, the catalyst has a certain catalytic action and can reduce the emission of CO, HC and NOx.
The invention also discloses a preparation method of the GPF quaternary catalyst, which is characterized by comprising the following steps: the method comprises the following steps:
step 1, weighing raw materials and pretreating: according to the content of each component in the catalyst coating, calculated by the total mass of oxides: the mass ratio of the promoter metal oxide is less than or equal to 13% and more than 0%, the activated alumina is 30-60%, the rare earth-transition metal composite oxide is 30-60%, the active component is less than or equal to 3% and more than 0%, the rest is binder, the active component is first noble metal: rh 1-1.5:1, the content of the first noble metal is 4-20g/ft3Rh content of 3-15g/ft3Calculating and weighing a catalysis-assisting metal oxide soluble salt, active alumina powder, rare earth-transition metal composite oxide powder, a nitrate solution of a first noble metal, a nitrate solution of Rh, a binder and glacial acetic acid, wherein the first noble metal is selected from Pd or Pt; the active alumina powder and the rare earth-transition metal composite oxide powder are processed for 1 to 5 hours at the temperature of 800-The treated material is substantially free of micropores;
step 3, preparing Rh catalyst powder: taking a certain amount of cocatalyst metal oxide soluble salt, active alumina powder, rare earth-transition metal composite oxide powder and Rh nitrate solution obtained in the step 1, dissolving the cocatalyst metal oxide soluble salt in a proper amount of pure water, adding the active alumina powder, the rare earth-transition metal composite oxide powder and the cocatalyst metal oxide soluble salt solution into a ball milling tank, ball milling for 3-8min, standing for 20-60min, adding Rh nitrate solution, continuing ball milling for 1-5min, and standing for 30-90min to form slurry; pouring the slurry out, drying at the temperature of 100-150 ℃, crushing, and roasting at the temperature of 850 ℃ for 1-3h at the temperature of 500-850 ℃ to obtain Rh catalyst powder;
The preparation process adopts a negative pressure or pressure difference mode for coating, and the coating is coated on the thin wall of the GPF carrier from the air inlet end in an adsorption or pressure difference mode, so that the coating can be uniformly distributed on the ceramic thin wall of the GPF carrier, and the catalytic effect on CO, HC and NOx is enhanced. Meanwhile, the catalyst coating can be more effectively fixed on the ceramic thin wall of the GPF carrier by roasting the coated GPF carrier at high temperature.
Further, in the preparation method of the GPF quaternary catalyst, the GPF carrier is a wall-flow filter and has the porosity of 50-70%.
Further, in the preparation method of the GPF quaternary catalyst, the cocatalytic metal oxide soluble salt is selected from one or more of nitrates or acetates of La, Ce, Zr, Fe, Mn, Ni, Ba.
Furthermore, in the preparation method of the GPF quaternary catalyst, the active alumina powder is composite alumina containing 1-20% of dopant, and the dopant is selected from La2O3、ZrO2、CeO2、Y2O3The specific surface area of the activated alumina powder is 120-200 square meters per gram, and the pore volume is 0.4-0.8 cc/g.
Further, in the preparation method of the GPF quaternary catalyst, the rare earth-transition metal composite oxide powder comprises the following components in parts by weight: 40-60% ZrO2、20-50％CeO2、10-20％La2O3、0-10％Y2O3、0-10％Pr6O11、0-10％Nd2O3、0-10％MnO2、0-10％Sr2O3、0-10％Co2O3。
The invention has the beneficial effects that:
1. compared with the traditional GPF, the invention not only ensures that Pd, Pt, Rh, catalysis-promoting metals and the like cannot block GPF ceramic pore passages, can reduce the back pressure of the catalyst and keep good particulate matter interception effect, but also can effectively purify and treat carbon monoxide, hydrocarbon and oxynitride at the air inlet end, realizes quaternary high-efficiency catalysis, is especially suitable for high-rotation-speed state and can show better particulate matter interception effect.
2. The preparation method is simple, the first noble metal, Rh and different cocatalyst oxides are loaded on different active alumina and rare earth-transition metal composite oxides to form first noble metal and Rh catalyst powder, and the first noble metal and Rh catalyst powder are bonded and mixed to form slurry for coating, and the single-coating mode simplifies the production process and reduces the production cost; the coating is uniform and compact, the adhesion performance is good, the amount of PM and PN in exhaust gas cannot be increased due to the existence of the coating, the noble metal and the cocatalyst metal oxide are uniformly dispersed, and the catalytic effect of the noble metal and the cocatalyst metal oxide on CO, HC and NOx can be obviously improved.
3. The high-temperature pretreatment of the active alumina powder and the rare earth-transition metal composite oxide powder in the preparation process can ensure that the material has no micropores basically, improve the durability of the catalyst, better bear active components and cocatalyst metals and ensure that the loaded noble metals are not easy to bury.
Drawings
FIG. 1 is a graph of PM emission concentration versus rotational speed for different catalytic treatment states during a 1.5L bench test of an engine.
FIG. 2 is a graph showing the relationship between PN emission concentration and rotation speed under different catalytic treatment states during a 1.5L bench test of an engine.
FIG. 3 is a plot of backpressure versus speed for different catalytic conditions during a 1.5L bench test of an engine.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example 1
In this embodiment, a wall-flow GPF carrier of cordierite material with a specification of Φ 118.4 × 127(mm) and a mesh number of 300cpsi is selected; of co-promoting metal oxidesThe dissolved salt solution is selected from cerium nitrate (mass fraction is 39%), lanthanum nitrate (mass fraction is 37.00%) and zirconium acetate solution (mass fraction is 25%); the active alumina powder body is 2.5 percent of La2O3And 97.5% Al2O3The specific surface area is 197.494 square meters per gram, and the pore volume is 0.7624 cc/g; the rare earth-transition metal composite oxide powder is prepared from cerium-zirconium-lanthanum-yttrium and cerium-zirconium-lanthanum-neodymium, wherein the main component of the cerium-zirconium-lanthanum-yttrium is 40% CeO2、50％ZrO2、5％La2O3、5％Y2O3The main component of cerium, zirconium, lanthanum and neodymium is 25 percent of CeO2、68％ZrO2、3％La2O3、4％Nd2O3(ii) a The adhesive is alumina sol with the mass fraction of 10%, glacial acetic acid is chemical pure, the first noble metal is Pd, the nitrate solution of the Pd is palladium nitrate with the mass fraction of 15.03%, the nitrate solution of Rh is rhodium nitrate with the mass fraction of 9.77%, and the active component is Pd: Rh which is 1: 1.
(1) Weighing raw materials and pretreating: according to the content of each component (calculated by the total mass of the oxides) in the catalyst coating, 3.298% of the promoter metal oxide (comprising 1.358% of cerium oxide, 0.97% of lanthanum oxide, 0.97% of zirconium oxide), 46.621% of active alumina, 46.233% of the rare earth-transition metal composite oxide (comprising 22.795% of cerium zirconium lanthanum yttrium, 23.438% of cerium zirconium lanthanum neodymium), 0.848% of the active component (comprising 0.424% of palladium oxide and 0.424% of rhodium oxide), 3% of the binder, and the mass ratio of the active components is Pd: rh 1:1, total noble metal content 12g/ft3Calculating and weighing the catalysis-assisting metal oxide soluble salt, the activated alumina powder, the rare earth-transition metal composite oxide powder, the palladium nitrate solution, the rhodium nitrate solution and the binder, and carrying out high-temperature treatment on the activated alumina powder and the rare earth-transition metal composite oxide powder at 1000 ℃ for 5 hours in a muffle furnace to ensure that the treated material has no micropores basically.
(2) Preparation of Pd catalyst powder 205 g: taking out cerium nitrate, lanthanum nitrate, zirconium acetate, activated alumina powder, cerium zirconium lanthanum yttrium and palladium nitrate solution in the step (1) according to the mass ratio of oxides in the Pd catalyst powder of 2%, 1%, 2%, 47.126%, 47% and 0.874% respectively; dissolving cerium nitrate, lanthanum nitrate and zirconium acetate in a proper amount of pure water, adding activated alumina powder, cerium zirconium lanthanum yttrium, cerium nitrate, lanthanum nitrate and zirconium acetate solution into a ball milling tank, ball milling for 5min, standing for 30min, adding palladium nitrate solution, continuing ball milling for 3min, and standing for 1h to form slurry; pouring the slurry out, drying at 120 ℃, crushing, and roasting at 600 ℃ for 2h to obtain Pd catalyst powder.
(3) Preparation of Rh catalyst powder 205 g: taking out lanthanum nitrate, zirconium acetate, active alumina powder, cerium-zirconium-lanthanum-neodymium and rhodium nitrate solution in the step (1) according to the mass ratio of the oxide in the Rh catalyst powder of 0.8%, 1%, 49%, 48.326% and 0.874% respectively; dissolving lanthanum nitrate and zirconium acetate in a proper amount of pure water, adding activated alumina powder, cerium zirconium lanthanum neodymium, lanthanum nitrate and zirconium acetate solution into a ball milling tank, ball milling for 5min, standing for 30min, adding rhodium nitrate solution, continuing ball milling for 3min, and standing for 1h to form slurry; pouring the slurry out, drying at 120 ℃, crushing, and roasting at 600 ℃ for 2h to obtain Rh catalyst powder.
(4) Preparation of slurry 400 g: according to Pd catalyst powder: adding 3% of Rh catalyst powder, 48.5% of Rh catalyst powder and 48.5% of Rh catalyst powder in the slurry according to the mass ratio of 1:1, adding a binder, the Pd catalyst powder and the Rh catalyst powder into a ball milling tank, adding glacial acetic acid accounting for 3% of the total amount of the oxides and a proper amount of water, carrying out ball milling for 10min, adding pure water to adjust the solid content to 33%, carrying out ball milling for 2min, and filtering to obtain the slurry.
(5) Coating a coating: and quantitatively uploading 211.76g of slurry to the air inlet end of the GPF carrier by using a coating machine according to the coating amount of 50g/L, taking most of water in the slurry out of the air outlet end by using the coating machine, uniformly coating the slurry on the ceramic wall surface of the through hole of the air inlet end of the GPF, and finishing the GPF coating.
(6) And (3) drying the coating: and drying the coated GPF catalyst for 0.5h by using a hot air drying line, and roasting at 550 ℃ for 3h to obtain the GPF quaternary catalyst.
The catalyst prepared above is GPF catalyst A.
Example 2
GPF catalyst B was prepared in a similar manner, except that it was coated in an amount of 30 g/L.
Example 3
GPF catalyst C was prepared in a similar manner, except that it was coated in an amount of 70 g/L.
Example 4
The other parts of the catalyst are the same as those of the GPF catalyst A, and the mass ratio of active components is changed to Pd: rh-4: 3, and the total content of Pd and Rh is 14g/ft3The coating application amount was 50g/L, giving GPF catalyst D.
Example 5
The other parts of the catalyst are the same as those of the GPF catalyst A, the first noble metal is Pt, and the mass ratio of active components is changed to Pt: rh 1:1, and the total content of the Pt and Rh noble metals is 12g/ft3The coating application amount was 50g/L, giving GPF catalyst E.
Example 6
In this embodiment, a cordierite wall-flow GPF carrier with a specification of Φ 118.4 × 127(mm) and a mesh number of 300cpsi is selected; the active alumina powder is selected from 1% La2O3、3％CeO2And 96% Al2O3Specific surface area of 187.24m2The pore volume is 0.6954 cc/g; the soluble salt solution of the promoter metal oxide is selected from cerous nitrate (mass fraction is 39%), lanthanum nitrate (mass fraction is 37.00%) and zirconium acetate solution (mass fraction is 25%); the adhesive is alumina sol with the mass fraction of 10 percent; the glacial acetic acid is selected from chemical purity, the first noble metal is selected from Pd, the nitrate solution of the Pd nitrate is 15.03 percent by mass, and the nitrate solution of Rh is 9.77 percent by mass of rhodium nitrate.
In the present embodiment, the mass ratio of the active components is Pd: rh 1:1, noble metal coating 12g/ft3The coating amount of the coating is 50g/L, ball milling is carried out by adopting a planetary ball mill, and coating is carried out by adopting a noble metal coating machine. The activated alumina powder and cerium zirconium lanthanum yttrium and cerium zirconium lanthanum neodymium are processed for 5 hours at 1000 ℃ by a muffle furnace.
The other preparation processes are the same as those of the GPF catalyst A to prepare the GPF catalyst F.
Test example 1
Aiming at seven catalytic treatment states of an empty pipe, a TWC + GPF carrier, a TWC + GPF catalyst A, TWC + a GPF catalyst B, TWC + a GPF catalyst C, TWC + a GPF catalyst D, TWC + a GPF catalyst E, a whole vehicle is used for carrying out emission test by 1.5L, and pollutant detection items are five items of CO, THC, NOx, PM and PN. In the test, the same TWC catalytic assembly was used, with only the GPF portion removed.
Table 1 shows the emission concentrations of the respective pollutants after passing through the respective catalytic treatment states described above.
As can be seen from table 1, the GPF catalysts A, B, C, D, E, F prepared in examples 1 to 6 have a good catalytic action for CO, HC, and NOx, and have an excellent effect of treating PM and PN.
Test example 2
Bench tests were performed with an engine of 1.5L for five conditions, empty pipe, TWC + GPF support, TWC + GPF catalyst A, TWC + GPF catalyst B, TWC + GPF catalyst C.
As can be seen from the combination of FIGS. 1 to 3, the GPF quaternary catalysts prepared in examples 1 to 3 have better treatment effects on PM and PN; and the back pressure increase is smaller. Compared with a GPF quaternary catalyst, the PM and PN treatment effects and the backpressure of the GPF carrier are basically the same in a low-rotating-speed test, although the backpressure of the GPF quaternary catalyst is slightly higher than that of the GPF carrier at a high rotating speed, the increase amplitude is smaller, and the PM and PN treatment effects are obviously improved.
The specific embodiments described herein are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. A preparation method of a GPF quaternary catalyst is characterized by comprising the following steps: the method comprises the following steps:
step 1, weighing raw materials and pretreating: according to the content of each component in the catalyst coating, calculated by the total mass of oxides: the mass ratio of the promoter metal oxide is less than or equal to 13% and more than 0%, the activated alumina is 30-60%, the rare earth-transition metal composite oxide is 30-60%, the active component is less than or equal to 3% and more than 0%, the rest is binder, the active component is first noble metal: rh 1-1.5:1, the content of the first noble metal is 4-20g/ft3Rh content of 3-15g/ft3Calculating and weighing a catalysis-assisting metal oxide soluble salt, active alumina powder, rare earth-transition metal composite oxide powder, a nitrate solution of a first noble metal, a nitrate solution of Rh, a binder and glacial acetic acid, wherein the first noble metal is selected from Pd or Pt; the active alumina powder and the rare earth-transition metal composite oxide powder are processed at the temperature of 800-1050 ℃ for 1-5 hours through a muffle furnace, so that the processed material basically has no micropores;
step 2, preparing first noble metal catalyst powder: taking a certain amount of cocatalyst metal oxide soluble salt, activated alumina powder, rare earth-transition metal composite oxide powder and nitrate solution of first noble metal in the step 1, dissolving the cocatalyst metal oxide soluble salt in a proper amount of pure water, adding the activated alumina powder, the rare earth-transition metal composite oxide powder and the cocatalyst metal oxide soluble salt solution into a ball milling tank, ball milling for 3-8min, standing for 20-60min, adding nitrate solution of the first noble metal, continuing ball milling for 1-5min, and standing for 30-90min to form slurry; pouring the slurry, drying at the temperature of 100-150 ℃, crushing, and roasting at the temperature of 850 ℃ for 1-3h at the temperature of 500-850 ℃ to obtain first noble metal catalyst powder;
step 3, preparing Rh catalyst powder: taking a certain amount of cocatalyst metal oxide soluble salt, active alumina powder, rare earth-transition metal composite oxide powder and Rh nitrate solution obtained in the step 1, dissolving the cocatalyst metal oxide soluble salt in a proper amount of pure water, adding the active alumina powder, the rare earth-transition metal composite oxide powder and the cocatalyst metal oxide soluble salt solution into a ball milling tank, ball milling for 3-8min, standing for 20-60min, adding Rh nitrate solution, continuing ball milling for 1-5min, and standing for 30-90min to form slurry; pouring the slurry out, drying at the temperature of 100-150 ℃, crushing, and roasting at the temperature of 850 ℃ for 1-3h at the temperature of 500-850 ℃ to obtain Rh catalyst powder;
step 4, preparing slurry: according to the first noble metal catalyst powder: adding a certain amount of binder, first noble metal catalyst powder and Rh catalyst powder into a ball milling tank, adding glacial acetic acid accounting for 2-5% of the total mass of oxides and a proper amount of pure water, carrying out ball milling for 5-20min, adding pure water to adjust the solid content to 25-36%, carrying out full ball milling for 1-5min to uniformly mix, and filtering to obtain slurry;
step 5, coating a coating: quantitatively loading the slurry on the air inlet end of the GPF carrier by using a coating machine according to the coating amount of 30-70g/L of the coating, taking most of water in the slurry out of the air outlet end by using the coating machine, and uniformly coating the slurry on the wall surface of the air inlet end port of the GPF carrier;
step 6, drying the coating: and drying the coated GPF carrier for 0.3-1h by using a hot air drying line, and roasting at 850 ℃ for 1-5h at 500-.
2. The method of making a GPF quaternary catalyst according to claim 1, characterized in that: the GPF support is a wall-flow filter with a porosity of 50-70%.
3. The method of making a GPF quaternary catalyst according to claim 1, characterized in that: the promoter metal oxide soluble salt is selected from one or more of nitrates or acetates of La, Ce, Zr, Fe, Mn, Ni and Ba.
4. The method of making a GPF quaternary catalyst according to claim 1, characterized in that: the active alumina powder is composite alumina containing 1-20% of dopant, and the dopant is selected from La2O3、ZrO2、CeO2、Y2O3The specific surface area of the activated alumina powder is 120-200 square meters per gram, and the pore volume is 0.4-0.8 cc/g.
5. Root of herbaceous plantThe method of preparing a GPF quaternary catalyst according to claim 1, characterized in that: the rare earth-transition metal composite oxide powder comprises the following components in percentage by weight: 40-60% ZrO2、20-50％CeO2、10-20％La2O3、0-10％Y2O3、0-10％Pr6O11、0-10％Nd2O3、0-10％MnO2、0-10％Sr2O3、0-10％Co2O3。
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| US11305260B2 (en) * | 2018-02-26 | 2022-04-19 | Basf Corporation | Catalyst for gasoline engine exhaust gas aftertreatment |
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| CN114505074A (en) * | 2022-03-03 | 2022-05-17 | 无锡威孚环保催化剂有限公司 | Catalyst for double-reduction type non-road gasoline engine and preparation method thereof |
| CN115382540A (en) * | 2022-07-29 | 2022-11-25 | 凯龙蓝烽新材料科技有限公司 | Preparation method of modified alumina carrier supported noble metal catalyst for lean burn CNG |
| CN115773170B (en) * | 2022-11-25 | 2024-03-26 | 同济大学 | Lean burn gasoline engine NO x Exhaust aftertreatment device and control method |
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