CN115501909A - Synthesis method and application of Ce-modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst - Google Patents
Synthesis method and application of Ce-modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst Download PDFInfo
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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
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/82—Phosphates
- B01J29/84—Aluminophosphates containing other elements, e.g. metals, boron
- B01J29/85—Silicoaluminophosphates (SAPO compounds)
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- 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
- F01N3/021—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
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
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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
- B01J2229/00—Aspects of molecular sieve catalysts not covered by B01J29/00
- B01J2229/10—After treatment, characterised by the effect to be obtained
- B01J2229/18—After treatment, characterised by the effect to be obtained to introduce other elements into or onto the molecular sieve itself
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention provides a preparation method of a Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst, which at least comprises the following steps: s1, mixing a copper sulfate solution and a TEPA template agent, and stirring for more than 2 hours; s2, adding cerous nitrate hexahydrate into the solution prepared in the S1, and stirring for more than 2 hours; s3, mixing phosphoric acid and pseudo-boehmite, adding deionized water, and stirring for more than 6 hours; s4, adding a mixed solution of Cu-TEPA and Ce into the gel in the S3 and stirring for more than 2 hours; s5, mixing the white carbon black and propylamine, adding the mixture into deionized water, and stirring for more than 2 hours; s6, adding the solution obtained in the S5 into the mixture prepared in the S4, and stirring for more than 2 hours; s7, adding the mixture in the S6 into a hydrothermal reaction kettle, and crystallizing for over 72 hours in a constant-temperature oven; s8, naturally cooling the mixture in the reaction kettle, filtering, washing and drying at 100 ℃; and S9, roasting the solid obtained in the S8 in a muffle furnace. The method provided by the invention enhances the low-temperature hydrothermal stability and durability of the Cu-SAPO-34 molecular sieve catalyst.
Description
The technical field is as follows:
the invention relates to a synthesis method and application of a Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst, belonging to the field of chemical synthesis technology and application thereof.
Background art:
nitrogen oxides, a major atmospheric pollutant, are mainly derived from plant exhaust gases and motor vehicle exhaust gases, and their environmental hazards are of increasing concern. The pollution of nitrogen oxide (NOx) in the tail gas of the diesel vehicle becomes one of the most prominent problems in the air pollution in China. In the denitration with a mobile source, the elimination of nitrogen oxides (NOx) by ammonia selective catalytic reduction (NH 3-SCR) becomes the most potential and widely applied denitration technology at present due to the advantages of high efficiency and low cost.
The chabazite molecular sieve is a CHA-type topological structure and has a three-dimensional pore structure and orthogonal symmetry, a one-dimensional main pore channel is formed by double eight-membered rings, the pore size is 0.38nm multiplied by 0.38nm, and the framework density is 14.5. The topological structure of the CHA molecular sieve is characterized in that double 6 rings (d 6 r) are connected through 4-membered rings to form a CHA big cage, the crystal face of the d6r faces the CHA big cage, cu ions can be stabilized in the d6r at high temperature, and the Cu ions in the molecular sieve can migrate, so that the CHA molecular sieve is the Cu-SSZ-13 molecular sieve with the unique physicochemical characteristics of SCR reaction potential of a small-pore molecular sieve. The study shows that Cu 2+ Unique on the d6r face, and (CuOH) + Is located near the 8-membered ring and exists as an active component. The SSZ-13 and SSZ-62 molecular sieves are chabazite molecular sieves having a typical CHA structure, and are widely used as cracking catalysts, MTO reaction catalysts, nitrogen oxide reduction catalysts, and nitrogen oxide reduction catalysts using Selective Catalytic Reduction (SCR).
The Cu-SAPO-34 molecular sieve catalyst has a typical CHA structure, al and P atoms are used as frameworks, the catalytic activity is excellent, the hydrothermal stability is good, but a phosphorus framework is easy to collapse under a low-temperature hydrothermal condition, so that the low-temperature hydrothermal performance of the catalyst is poor.
The invention content is as follows:
in view of the above, the invention aims to provide a preparation method and application of a Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst, so that the low-temperature hydrothermal aging resistance of Cu-SAPO-34 is enhanced, the durability of the catalyst is further improved on the basis of meeting the national six-standard requirements, the catalytic performance of the catalyst is maintained and even improved, and the reliability and the service life of the catalyst are improved when the catalyst is used for an after-treatment device of a motor vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a preparation method of a Ce modified Cu-SAPO-34 molecular sieve catalyst with low-temperature hydrothermal aging resistance at least comprises the following steps:
s1, mixing a copper sulfate solution with a certain mass fraction and a TEPA template agent with a certain mass fraction, and stirring for more than 2 hours to prepare Cu-TEPA;
and S2, adding a certain mass of cerous nitrate hexahydrate into the solution prepared in the S1, and stirring for more than 2 hours until the cerous nitrate hexahydrate is completely dissolved.
And S3, mixing phosphoric acid and pseudo-boehmite with a certain mass, adding deionized water with a certain mass, and stirring for more than 6 hours until uniform gel appears.
And S4, adding the mixed solution of Cu-TEPA and Ce into the gel in the S3, and stirring for more than 2h.
And S5, mixing a certain mass of white carbon black and propylamine, adding into deionized water, and stirring for more than 2 hours.
And S6, adding the solution obtained in the S5 into the mixture prepared in the S4, and stirring for more than 2 hours.
And S7, adding the mixture in the S6 into a hydrothermal reaction kettle, and putting the hydrothermal reaction kettle into a constant-temperature oven for crystallization for over 72 hours.
And S8, pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ for 12 hours.
S9, roasting the dried sample in a muffle furnace for a certain time to obtain the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst.
The Ce modified Cu-SAPO-34 molecular sieve catalyst with low-temperature hydrothermal aging resistance enhances the low-temperature hydrothermal aging resistance of the SAPO-34 molecular sieve carrier, further improves the durability of the catalyst on the basis of meeting the national six-standard requirements, maintains and even improves the catalytic performance of the catalyst, and improves the reliability and the service life of the catalyst when being used for a post-treatment device of a motor vehicle.
The method further improves the performance of the traditional SAPO-34 molecular sieve catalyst, so that the catalyst maintains higher catalytic activity at the temperature of below 400 ℃, and the catalytic activity at the temperature of above 400 ℃ is improved. The structure and the stability of active components of the molecular sieve can be still maintained to a certain degree under the low-temperature hydrothermal aging condition of more than 16h at 70 ℃, the hydrothermal aging resistance of the molecular sieve is improved on the whole, the working effect of the catalyst under severe conditions is improved obviously, the reliability and the service life of a post-treatment device are obviously improved, and the catalyst has higher practical popularization and application values.
Furthermore, various raw materials required by the cerium modified SAPO-34 molecular sieve catalyst prepared by the one-pot method need to be prepared separately.
Further, S1 is a template for preparing Cu-TEPA.
Furthermore, the mass fraction of the copper sulfate solution in S1 is between 20 and 30 percent, the mass of the TEPA template agent is about 10g, the volume of the prepared solution is between 100 and 200ml, and the stirring is carried out for more than 2 hours so as to ensure that the copper sulfate solution and the TEPA template agent are completely dissolved.
Further, the mass of the cerium nitrate hexahydrate in the S2 is 1 g-10 g, and the cerium nitrate hexahydrate is selected to control the content of Ce according to needs.
Furthermore, the mass of the phosphoric acid and the pseudo-boehmite in the S3 is less than 20g, the phosphoric acid and the pseudo-boehmite are added into deionized water of less than 200ml, gel formed by stirring is uniform and shows good colloid property, the gel has moderate viscosity which is a raw material formed by a molecular sieve framework, and the good proportion is beneficial to the forming of the molecular sieve framework.
Furthermore, all the stirring speeds are between 100 and 300 revolutions per minute, and the constant stirring speed is kept.
The preparation is carried out by stirring in a water bath constant temperature state, and the preparation method has the following advantages: the heating keeps the temperature invariable and even under the water bath condition, prevents that local temperature from being too high and being too low to cause the deviation of structure shaping, maintains the invariable of solution volume and prevents that rapid evaporation of moisture from causing premature crystallization and precipitation, and the length is favorable to the intensive mixing of each raw materials for invariable stirring speed and sufficient stirring.
Further, a mixed solution of Cu-TEPA and Ce was added to the gel prepared in S3, followed by stirring.
Further, less than 20g of white carbon black and propylamine in S5 are added into deionized water less than 200 ml.
Further, the stirring in S6 requires heating to maintain a constant temperature between 50 and 100 ℃.
After S6 is finished, all the raw materials with the Cu-SAPO-34 structure forming are obtained, and then the slow crystallization forming can be realized by giving certain crystallization conditions.
Further, the hydrothermal reaction kettle in S7 is kept well sealed, and is put into an oven at 180 ℃ for crystallization for more than 72 hours.
Furthermore, the filtration in S8 is suction filtration, so that the filtration speed can be increased and the environmental influence can be reduced.
Further, the ratio of distilled water to the solution required for washing in S8 was 5:1 or more to ensure that the surface of the catalyst is substantially free from metal ions.
Further, the drying in S8 is more than 12h, and the finished catalyst powder is prepared primarily.
Furthermore, the method can be used for rapidly performing suction filtration and washing, and preventing the deposition of metal ions on the surface of the molecular sieve catalyst from generating adverse effects on the performance of the catalyst and evaluation tests.
Further, the finished catalyst powder is roasted in a muffle furnace to remove impurities, the roasting temperature is 500-800 ℃, and the roasting time is more than 5 hours.
The application of the Ce modified Cu-SAPO-34 molecular sieve catalyst with low-temperature hydrothermal aging resistance is characterized in that slurry of the catalyst is coated on a carrier to prepare an integral catalyst which is used for catalyzing and purifying nitrogen oxides in motor vehicle exhaust.
Compared with the conventional molecular sieve catalyst, under the same test condition, the catalytic efficiency of the catalyst is not reduced in a temperature window below 400 ℃ in NH3-SCR reaction, and the catalytic efficiency of the catalyst is improved at 400-500 ℃. Meanwhile, the efficiency of the catalyst is obviously improved after the catalyst is subjected to low-temperature hydrothermal aging after Ce modification.
Further, the catalytic activity is calculated by the following formula:
compared with the prior art, the preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst has the following advantages:
the low-temperature hydrothermal aging resistance of the SAPO molecular sieve is enhanced, the durability of the catalyst is further improved on the basis of meeting the national six-standard requirements, the catalytic performance of the catalyst is maintained and even improved, and the catalyst is used for an after-treatment device of a motor vehicle, so that the reliability of the catalyst is improved, and the service life of the catalyst is prolonged.
The catalyst can replace the traditional copper molecular sieve catalyst, improves the tolerance and the working capacity of an aftertreatment system under unfavorable working conditions while not changing or even slightly improving the catalytic performance of the catalyst, and has higher practical popularization and application values.
According to the invention, the Ce modified Cu-SAPO-34 molecular sieve based catalyst is synthesized by using a one-pot method, the Ce element is added in the synthesis process, so that the trouble of subsequent ion exchange is avoided, meanwhile, the Ce content is easy to control, and the low-temperature hydrothermal aging resistance of the Cu-SAPO-34 molecular sieve based catalyst is greatly improved.
At NH 3 In the SCR technology, the Ce modified Cu-SAPO-34 molecular sieve catalyst prepared by the invention realizes the simulation of tail gas conditions (total flow V =500ml/min, [ NO ]]＝500ppm、[NH 3 ]＝500 ppm、[O 2 ]＝5％、N 2 As balance gas, the airspeed is 40000h -1 )。
Drawings
FIG. 1 shows Cu-SAPO-34 molecular sieve SCR catalyst NO after modification of Ce elements with different contents x Removing ofEfficiency.
The specific implementation mode is as follows:
it should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention will be described in detail with reference to the following examples.
In the present invention, NH 3 Simulated smoke composition used for SCR performance testing: 500ppm NO,500 ppm NH 3 ，5％O 2 ，N 2 The total flow rate is 500ml/min for balancing gas, and the reaction space velocity is 40000h -1 。
Example 1
Firstly, 20 percent of CuSO by mass fraction 4 Preparing 100ml of solution by 10ml of solution and 10g of TEPA, and stirring for 2 hours; adding 2.5g of cerous nitrate hydrate into the template agent and stirring for 2 hours; adding 10g of phosphoric acid and 10g of pseudo-boehmite into 50ml of deionized water, and stirring for 2 hours until uniform gel appears; adding the mixed solution of Cu-TEPA and Ce into the gel and stirring for more than 2h; mixing 10g of white carbon black and 10g of propylamine, adding the mixture into 50ml of deionized water, and stirring for more than 2 hours; then all the solutions are mixed and stirred for 2 hours; pouring the mixed solution into a reaction kettle, and putting the reaction kettle into a 180 ℃ oven for crystallization for 72 hours; pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ for 12 hours; the solid obtained was calcined in a muffle furnace at 500 ℃ for 5h.
Example 2
Firstly, 20 percent of CuSO by mass 4 Preparing 100ml of solution by 10ml of solution and 10g of TEPA, and stirring for 2 hours; adding 5g of cerous nitrate hydrate into the template agent and stirring for 2 hours; adding 10g of phosphoric acid and 10g of pseudo-boehmite into 50ml of deionized water, and stirring for 2 hours until uniform gel appears; adding the mixed solution of Cu-TEPA and Ce into the gel and stirring for more than 2h; mixing 10g of white carbon black and 10g of propylamine, adding the mixture into 50ml of deionized water, and stirring for more than 2 hours; then all the solutions are mixed and stirred for 2 hours; pouring the mixed solution into a reaction kettle, and putting the reaction kettle into a 180 ℃ oven for crystallization for 72 hours; pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ for 12 hours; the obtained solidThe mixture is roasted in a muffle furnace for 5 hours at 500 ℃.
Example 3
Firstly, 20 percent of CuSO by mass fraction 4 Preparing 100ml of solution by 10ml of solution and 10g of TEPA, and stirring for 2 hours; adding 7.5g of cerous nitrate hydrate into the template agent, and stirring for 2h; adding 10g of phosphoric acid and 10g of pseudo-boehmite into 50ml of deionized water, and stirring for 2 hours until uniform gel appears; adding the mixed solution of Cu-TEPA and Ce into the gel and stirring for more than 2h; mixing 10g of white carbon black and 10g of propylamine, adding the mixture into 50ml of deionized water, and stirring for more than 2 hours; then all the solutions are mixed and stirred for 2 hours; pouring the mixed solution into a reaction kettle, and putting the reaction kettle into a 180 ℃ oven for crystallization for 72 hours; pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ for 12 hours; the solid obtained was calcined in a muffle furnace at 500 ℃ for 5h.
Comparative example
Firstly, 20 percent of CuSO by mass fraction 4 Preparing 100ml of solution by 10ml of solution and 10g of TEPA, and stirring for 2 hours; adding 10g of phosphoric acid and 10g of pseudo-boehmite into 50ml of deionized water, and stirring for 2 hours until uniform gel appears; adding the mixed solution of Cu-TEPA and Ce into the gel and stirring for more than 2h; mixing 10g of white carbon black and 10g of propylamine, adding the mixture into 50ml of deionized water, and stirring for more than 2 hours; then all the solutions are mixed and stirred for 2 hours; pouring the mixed solution into a reaction kettle, and putting the reaction kettle into a 180 ℃ oven for crystallization for 72 hours; pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ for 12 hours; the solid obtained is calcined in a muffle furnace at 500 ℃ for 5h.
In the figure, cu-F is a comparative example, the Ce element is not modified, the other three examples are examples, the Ce element with different contents is added for modification, the same fresh sample can be seen, and the catalytic efficiency of the catalyst at 400-500 ℃ is improved by about 15 percent on average after the Ce is modified. The catalytic efficiency of the comparative example is obviously reduced after the catalyst is subjected to low-temperature hydrothermal aging at 70 ℃ for more than 16h, but one example still keeps high catalytic activity after the hydrothermal aging, and the Ce modification can obviously improve the low-temperature hydrothermal aging resistance of the Cu-SAPO-34 molecular sieve catalyst.
In conclusion, the preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst for resisting high-temperature hydrothermal aging provided by the invention enhances the low-temperature hydrothermal aging resistance of the molecular sieve, further improves the durability of the catalyst on the basis of meeting the national six-standard requirements, maintains and even improves the catalytic performance of the catalyst, and improves the reliability and the service life of the catalyst when the catalyst is used for an after-treatment device of a motor vehicle.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (10)
1. A preparation method of a Ce modified Cu-SAPO-34 molecular sieve catalyst with low-temperature hydrothermal aging resistance is characterized by comprising the following steps:
at least comprises the following steps:
s1, mixing a copper sulfate solution with a certain mass fraction and a TEPA template agent with a certain mass fraction, and stirring for more than 2 hours to prepare Cu-TEPA;
and S2, adding a certain mass of cerous nitrate hexahydrate into the solution prepared in the S1, and stirring for more than 2 hours until the cerous nitrate hexahydrate is completely dissolved.
And S3, mixing phosphoric acid and pseudo-boehmite with a certain mass, adding deionized water with a certain mass, and stirring for more than 6 hours until uniform gel appears.
And S4, adding the mixed solution of Cu-TEPA and Ce into the gel in the S3, and stirring for more than 2h.
And S5, mixing a certain mass of white carbon black and propylamine, adding into deionized water, and stirring for more than 2 hours.
And S6, adding the solution obtained in the S5 into the mixture prepared in the S4, and stirring for more than 2 hours.
And S7, adding the mixture in the S6 into a hydrothermal reaction kettle, and putting the hydrothermal reaction kettle into a constant-temperature oven for crystallization for over 72 hours.
And S8, pouring out the mixture in the reaction kettle, naturally cooling, filtering, washing, and drying at 100 ℃ overnight.
2. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
and S9, roasting the solid obtained in the S8 in a muffle furnace for a certain time.
3. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
the mass fraction of the copper sulfate solution in S1 is between 20 and 30 percent, the mass of the TEPA template agent is about 10g, and the volume of the prepared solution is between 100 and 200 ml.
4. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
all the stirring operations need to maintain a constant stirring speed between 300 and 500 revolutions per minute.
5. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
the mass of the cerous nitrate hexahydrate in the S2 is between 1g and 10 g.
6. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, wherein the preparation method comprises the following steps:
the mass of the phosphoric acid and the pseudo-boehmite in the S3 is less than 20g, the phosphoric acid and the pseudo-boehmite are added into deionized water of less than 200ml, and the gel formed by stirring is uniform, shows good colloid property and has moderate viscosity.
7. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, wherein the preparation method comprises the following steps:
and adding the white carbon black and the propylamine in the S5 into deionized water of which the amount is less than 20g and less than 200 ml.
8. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
and the temperature of the oven in the S7 is maintained between 100 and 200 ℃.
9. The preparation method of the Ce modified low-temperature hydrothermal aging resistant Cu-SAPO-34 molecular sieve catalyst according to claim 1, which is characterized in that:
the temperature of the muffle furnace in the S9 is 500-800 ℃, and the roasting time is more than 5h.
10. The application of the Ce modified Cu-SAPO-34 molecular sieve catalyst with low-temperature hydrothermal aging resistance is characterized in that: coating a slurry of the catalyst of any one of claims 1 to 9 on a support to prepare a monolithic catalyst for the catalytic purification of nitrogen oxides in the exhaust gases of motor vehicles.
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