CN108609633A - A kind of NaY molecular sieve synthetic method of high-efficiency cleaning - Google Patents
A kind of NaY molecular sieve synthetic method of high-efficiency cleaning Download PDFInfo
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- CN108609633A CN108609633A CN201810936078.2A CN201810936078A CN108609633A CN 108609633 A CN108609633 A CN 108609633A CN 201810936078 A CN201810936078 A CN 201810936078A CN 108609633 A CN108609633 A CN 108609633A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/20—Faujasite type, e.g. type X or Y
- C01B39/24—Type Y
Abstract
The invention discloses a kind of NaY molecular sieve synthetic methods of high-efficiency cleaning, it is characterised in that synthesizes without acid silicon source in the raw material of NaY molecular sieve, while at least containing one of following characteristics：Aluminum silicon powder is also added with when a), preparing gel reaction mixture as the NaY silicon sources synthesized and silicon source；B), in NaY molecular sieve crystallization mother liquor direct reuse to the synthesis of NaY molecular sieve.Using method provided by the invention, the environmental problem that the discharge of sodium salt is brought is eliminated, also significantly reduces the processing cost of NaY mother liquors, the production cost of NaY molecular sieve reduces by 20% or more.
Description
Technical field
The present invention relates to a kind of NaY molecular sieve synthetic methods, belong to molecular sieve field of inorganic materials and field of environment protection.
Background technology
Y type molecular sieve is made with flourishing 3 D pore canal, acid adjustable, good heat and hydrothermal stability, as catalysis
Agent or adsorbent are widely used in petrochemical industry, about 80,000 tons of China's NaY molecular sieve Year's consumption, are most large molecules
Sieve catalysis material.The method of industrial synthesis NaY molecular sieve mostly uses greatly GRACE companies of the similar U.S. in US3639099 at present
With the directing agent method proposed in US3671191, mixed by certain proportioning with water, at 15-80 DEG C with waterglass, sodium metaaluminate
At a temperature of, place 4-60 hour, obtained directed agents, be then added to by weight 1-15% prepare with silicon source, silicon source,
In gel made of water, silicon source refers to that waterglass or sodium metasilicate, silicon source refer to sodium metaaluminate, aluminum sulfate, aluminum nitrate, chlorination
Aluminium etc..
In all these NaY synthetic methods, because having acid silicon source (such as aluminum sulfate, aluminum nitrate, aluminium chloride)
In the presence of the inevitable generation for having sodium salt in NaY processes, most common acidity silicon source is aluminum sulfate, therefore, is generated in NaY synthesis
A large amount of sodium sulphate, due to that need to control the discharge capacity of salt in sewage, this just brings very big environmental protection treatment pressure.
Invention content
The purpose of the present invention is to provide a kind of efficient, cleaning, the NaY molecular sieve synthetic methods of low cost.
NaY molecular sieve synthetic method provided by the invention, it is characterised in that：It synthesizes and is free of acid silicon source in the raw material of NaY,
At least contain one of following characteristics simultaneously：
Aluminum silicon powder is also added with when a), preparing gel reaction mixture as the NaY silicon sources synthesized and silicon source；Described aluminum silicon powder
Molar ratio be (0.01 ~ 15) SiO2：(0.02~10)Al2O3：H2O, specific surface area is in 80 ~ 800m2/ g, pore volume 0.10 ~
2.8ml/g；
B), in NaY crystallization mother liquors direct reuse to the synthesis of NaY.
NaY molecular sieve synthetic method provided by the invention, further includes following procedure：
1) directed agents, are prepared：Sodium metasilicate, sodium metaaluminate and water are pressed into mol ratio (10-30) Na20：A1203：(10-30)
Si02：(120-400) H20 mixing, by mixture at 15 DEG C ~ 60 DEG C, directed agents are made in 2 ~ 40h of aging；
2) gel reaction mixture, is prepared：It is under 10 DEG C ~ 90 DEG C stirring conditions, directed agents, silicon source, alkaline solution, NaY is female
Liquid, aluminum silicon powder or silicon source mix, and stir evenly, and gel reaction mixture are made, wherein gel reaction mixture rubs
Your proportioning is (1.3 ~ 3.8) Na20 :A1203 : (6-18) Si02 : (100-300) H20, the directed agents dosage accounts for solidifying
The 1% ~ 30% of glue reaction mixture total weight；
3) NaY zeolite, is synthesized：Above-mentioned gel reaction mixture is warming up to 80-120 DEG C of crystallization 6-40h, using filtering, wash
It washs, dry, NaY molecular sieve is made.
Refer to without aluminum sulfate, aluminum nitrate, aluminium chloride, fluorination without acid silicon source in the raw material of described synthesis NaY
Or mixtures thereof aluminium, aluminum phosphate, aluminium triformate, aluminum acetate.
The aluminum silicon powder is to prepare with the following method：Quartz sand, aluminium hydrate powder and soda ash are in molar ratio (0.1 ~ 15)
SiO2：(0.1~10)Al2O3：Na2O melts at 1100 DEG C ~ 1450 DEG C after mixing, adds water that solution is made, with CO2Gas is anti-
It answers, sediment obtains aluminum silicon powder through being filtered, washed, drying.
Described NaY crystallization mother liquors, refer to process 3) the NaY slurries after crystallization contain sodium metasilicate through what is be filtered, washed
Liquid, SiO2Content is usually no more than 110g/l.
The alkaline matter for preparing gel reaction mixture refer to sodium hydroxide, waterglass, sodium carbonate/bicarbonate and
Any one or more in sodium metaaluminate.
The silicon source for preparing gel reaction mixture refers in aluminum silicon powder, Ludox, waterglass, white carbon, sodium metasilicate
Any one or more.
The silicon source for preparing gel reaction mixture refers to any one in aluminum silicon powder, sodium metaaluminate, boehmite
Kind is a variety of.
In method provided by the invention, process 1) described in prepare the methods of directed agents and can be oriented to by existing conventional preparation
The method of agent carries out, and is carried out according to the method for the present invention without special or limitation, remaining process.
In method provided by the invention, process 2) described in prepare the method for gel reaction mixture can be solidifying by existing synthesis
The method of glue carries out, and without particular/special requirement, can sequentially add continuously to mix, but must be uniformly mixed, remaining
Process is carried out according to the method for the present invention.
In method provided by the invention, process 3) crystallization method of synthesis NaY zeolite is the conventional crystallization of synthesis of molecular sieve
Method, the present invention limit not to this, and also without particular/special requirement, being filtered, washed, drying after crystallization is existing skill
Art, the present invention do not have particular/special requirement.
The advantages of method provided by the invention, is：
Method provided by the invention does not use acid silicon source, or makees silicon source/silicon source using aluminum silicon powder, is not present in the synthesis process
Acidic anionic does not just have acidic anionic sodium salt yet, has been inherently eliminated the emission problem of acidic anionic sodium salt.
Using method provided by the invention, NaY mother liquors can be in direct reuse to synthesis, to significantly reduce NaY mothers
The production cost of the processing cost of liquid, NaY molecular sieve reduces by 20% or more.
Using method provided by the invention, NaY synthesizes the acidic anionic sodium salt that high concentration is not present in crystallization process, can
Relatively easily simply to directly obtain SiO2/Al2O3Molar ratio reaches 6.0 or more NaY molecular sieve.
Specific implementation mode
Method provided by the invention will be further detailed in the following examples, but therefore not limit this hair
It is bright.
Waterglass used in embodiment is commercial solid sodium metasilicate product, is dissolved into SiO2Content is 250g/l, mould
Number is 3.1, proportion 1.25.
High alkali deflection aluminium acid sodium solution is aluminium hydroxide liquid feeding alkali soluble solution, Al2O3Content is 41g/l, Na2O content 280g/l,
It is 1.36 for proportion.
Low alkali aluminium acid sodium solution is aluminium hydroxide liquid feeding alkali soluble solution, Al2O3Content is 100g/l, Na2O content 150g/l,
It is 1.24 for proportion.
Liquid caustic soda is ordinary commercial products, sodium hydrate content 30%wt.
Ludox is ordinary commercial products, pH value 9.0, SiO2Content 30%wt.
Boehmite is Yueyang Hui Jing new materials Co., Ltd product, Al2O3Content is 71%wt, Na2O content is
0.01%wt。
Embodiment 1
The present embodiment is the preparation of aluminum silicon powder.
Quartz sand, aluminium hydroxide and sodium carbonate press SiO2：Al2O3：Na2The molar ratio of O is 2.7：0.3：1 is uniformly mixed, and send
It is to be roasted in 1400 ~ 1420 DEG C of high temperature kilns to enter temperature, forms high temperature melting melt body, is contacted with water, generates liquid, adjusts concentration
(with SiO2+ Al2O3Meter) 40g/l is arrived, it is sent into carbonators and CO2Gas reaction, control PH are 8.0-8.5, and temperature is in 40-65
℃。
React qualified material with deionized water carries out it is repeated multiple times be filtered, washed, filter cake is dry at 300 DEG C into drier
It is dry, obtain aluminum silicon powder A.
Through analysis, the group of aluminum silicon powder A becomes：Al2O3Content 12.41%wt, SiO2Content 65.69%wt, water content 21.90%
Wt, molecular structure can be expressed as 0.9SiO with molar ratio2.0.1Al2O3.H2O, specific surface area 445m2/g, pore volume
0.48ml/g, Na2O content are 0.05%wt.
Embodiment 2
The present embodiment is the preparation of aluminum silicon powder.
Quartz sand, aluminium hydroxide and sodium carbonate press SiO2：Al2O3：Na2The molar ratio of O is 2.8：0.4：1 is uniformly mixed, and send
It is to be roasted in 1400 ~ 1420 DEG C of high temperature kilns to enter temperature, forms high temperature melting melt body, is contacted with water, generates liquid, adjusts concentration
(with SiO2+ Al2O3Meter) 30g/l is arrived, it is sent into carbonators and CO2Gas reaction, control PH are 9.0-9.5, and temperature is in 40-65
℃。
React qualified material with deionized water carries out it is repeated multiple times be filtered, washed, filter cake is dry at 300 DEG C into drier
It is dry, obtain aluminum silicon powder B.
Through analysis, the group of aluminum silicon powder B becomes：Al2O3Content 15.9%wt, SiO2Content 65.42%wt, water content 18.7%
Wt, molecular structure can be expressed as 1.05SiO with molar ratio2.0.15Al2O3.H2O, specific surface area 345m2/g, pore volume
0.68ml/g、Na2O content is 0.02%wt.
Embodiment 3
The present embodiment is prepared for directed agents.
9000ml water glass solutions, 6220ml high alkali deflection aluminium acid sodium solution are added in the stainless steel barrel of 25L, is sufficiently mixed
Uniformly, aging 20 hours at 20 DEG C, mol ratio 16SiO2：Al2O3：15Na2O：320H2O, it is spare.
Embodiment 4
2.4SiO in molar ratio2：Al2O3：8.7Na2O：210H2Under O, room temperature and stirring, deionized water 1445g, water are sequentially added
Glass 74.1g, low alkali aluminium acid sodium solution 76.9g, liquid caustic soda 117g, aluminum silicon powder A 340.5g, directed agents 222g, stir evenly
Afterwards, gel reaction mixture is obtained, 100 DEG C is then warming up to and stands aging 24 hours, be filtered, washed, be dried to obtain NaY molecules
Sieve, it is 89.6%, SiO to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches2/Al2O3Molar ratio is 6.5.
The mother liquor being filtered, washed is collected, mother liquor A is remembered, analyzes its SiO2Content is 37g/l, Na2O content is 17.2g/l, than
Weight is 1.04.
Embodiment 5
2.6SiO in molar ratio2：Al2O3：9.0Na2O：210H2Under O, room temperature and stirring, deionized water 600g, mother are sequentially added
Liquid A (embodiment 4 obtains) 848g, it waterglass 276.8g, boehmite 25g, liquid caustic soda 78g, aluminum silicon powder A 247.4g, is oriented to
Agent 222g after stirring evenly, obtains gel reaction mixture, is then warming up to 100 DEG C and stands aging 24 hours, be filtered, washed,
It is dried to obtain NaY molecular sieve, it is 87.3%, SiO to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches2/Al2O3Mole
Than being 6.7.
The mother liquor being filtered, washed is collected, mother liquor B is remembered, analyzes its SiO2Content is 38.7g/l, Na2O content is 21.2g/l,
Proportion is 1.04.
Embodiment 6
2.8SiO in molar ratio2：Al2O3：8.6Na2O：210H2Under O, room temperature and stirring, deionized water 641g, mother are sequentially added
Liquid A (embodiment 4 obtains) 954g, waterglass 14.4g, boehmite 20g, liquid caustic soda 151.5g, aluminum silicon powder A 276g, silicon are molten
Glue 60g, directed agents 222g after stirring evenly, obtain gel reaction mixture, are then warming up to 100 DEG C and stand aging 26 hours,
It is filtered, washed, is dried to obtain NaY molecular sieve, it is 93.3% to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches,
SiO2/Al2O3Molar ratio is 5.7.
The mother liquor being filtered, washed is collected, mother solution C is remembered, analyzes its SiO2Content is 48.7g/l, Na2O content is 24.3g/l,
Proportion is 1.05.
Mother liquor A, mother liquor B, mother solution C are mixed and stirred evenly, note mixing mother liquor D analyzes its SiO2Content is
43.5g/l Na2O content is 22.6g/l, proportion 1.04.
Embodiment 7
2.6SiO in molar ratio2：Al2O3：8.8Na2O：210H2Under O, room temperature and stirring, sequentially adds deionized water 666g, mixes
Mother liquor D (embodiment 6 obtains) 963g, waterglass 14.25g, liquid caustic soda 114.6g, aluminum silicon powder B 305g, directed agents 222g are closed, is stirred
After mixing uniformly, gel reaction mixture is obtained, 100 DEG C is then warming up to and stands aging 20 hours, be filtered, washed, be dried to obtain
NaY molecular sieve, it is 91.3%, SiO to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches2/Al2O3Molar ratio is 6.3.
The mother liquor being filtered, washed is collected, mother liquor E is remembered, analyzes its SiO2Content is 42.5g/l, Na2O content is 21.1g/l,
Proportion is 1.04.
Embodiment 8
2.8SiO in molar ratio2：Al2O3：9.0Na2O：210H2Under O, room temperature and stirring, sequentially adds deionized water 469g, mixes
Mother liquor D (embodiment 6 obtains) 1177g, liquid caustic soda 123.5g, aluminum silicon powder B 305g, directed agents 222g are closed, after stirring evenly, is obtained
To gel reaction mixture, then it is warming up to 100 DEG C and stands aging 16 hours, be filtered, washed, be dried to obtain NaY molecular sieve, use
It is 92.5%, SiO that X- diffraction approaches, which measure prepared NaY molecular sieve crystallinity,2/Al2O3Molar ratio is 5.5.
The mother liquor being filtered, washed is collected, mother liquor F is remembered, analyzes its SiO2Content is 59.5g/l, Na2O content is 24.6g/l,
Proportion is 1.06.
Embodiment 9
3.2SiO in molar ratio2：Al2O3：12Na2O：210H2Under O, room temperature and stirring, deionized water 180g, mixing are sequentially added
Mother liquor D (embodiment 6 obtains) 1177g, waterglass 450g, liquid caustic soda 64.5g, aluminum silicon powder B 305g, directed agents 222g, stirring are equal
After even, gel reaction mixture is obtained, 100 DEG C is then warming up to and stands aging 16 hours, is filtered, washed, is dried to obtain NaY points
Son sieve, it is 90.5%, SiO to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches2/Al2O3Molar ratio is 6.2.
The mother liquor being filtered, washed is collected, mother liquor G is remembered, analyzes its SiO2Content is 101g/l, Na2O content is 32.6g/l,
Proportion is 1.10.
Embodiment 10
2.4SiO in molar ratio2：Al2O3：8.8Na2O：210H2Under O, room temperature and stirring, deionized water 1447g, liquid are sequentially added
Alkali 165g, aluminum silicon powder B 305g, Ludox 140g, directed agents 222g after stirring evenly, obtain gel reaction mixture, then
It is warming up to 100 DEG C and stands aging 26 hours, be filtered, washed, be dried to obtain NaY molecular sieve, measured with X- diffraction approaches prepared
NaY molecular sieve crystallinity is 90.8%, SiO2/Al2O3Molar ratio is 6.8.
The mother liquor being filtered, washed is collected, mother liquor H is remembered, analyzes its SiO2Content is 35.0g/l, Na2O content is 18.5g/l,
Proportion is 1.03.
Mixing mother liquor D, mother liquor E, mother liquor F, mother liquor G, mother liquor H are mixed and stirred evenly, note mixing mother liquor J,
Analyze its SiO2Content is 58.0g/l, Na2O content is 24.0g/l, proportion 1.06.
Embodiment 11
2.3SiO in molar ratio2：Al2O3：9.2Na2O：210H2Under O, room temperature and stirring, sequentially adds deionized water 695g, mixes
Mother liquor J (coming from embodiment 10) 986g, liquid caustic soda 80g, aluminum silicon powder B 305g, directed agents 222g are closed, after stirring evenly, obtains gel
Then reaction mixture is warming up to 100 DEG C and stands aging 32 hours, is filtered, washed, is dried to obtain NaY molecular sieve, with X- diffraction
It is 91.8%, SiO that method, which measures prepared NaY molecular sieve crystallinity,2/Al2O3Molar ratio is 7.3.
The mother liquor being filtered, washed is collected, mother liquor K is remembered, analyzes its SiO2Content is 33.0g/l, Na2O content is 16.2g/l,
Proportion is 1.03.
Embodiment 12
2.3SiO in molar ratio2：Al2O3：9.5Na2O：210H2Under O, room temperature and stirring, sequentially adds deionized water 551g, mixes
Mother liquor J (coming from embodiment 10) 1150g, liquid caustic soda 68g, aluminum silicon powder B 305g, directed agents 222g are closed, after stirring evenly, is coagulated
Then glue reaction mixture is warming up to 100 DEG C and stands aging 36 hours, is filtered, washed, is dried to obtain NaY molecular sieve, spread out with X-
It is 86.8%, SiO that the method for penetrating, which measures prepared NaY molecular sieve crystallinity,2/Al2O3Molar ratio is 7.3.
The mother liquor being filtered, washed is collected, mother liquor M is remembered, analyzes its SiO2Content is 35.0g/l, Na2O content is 16.2g/l,
Proportion is 1.03.
Embodiment 13
2.5SiO in molar ratio2：Al2O3：8.8Na2O：210H2Under O, room temperature and stirring, sequentially adds deionized water 360g, mixes
It closes mother liquor J (coming from embodiment 10) 848g, waterglass 375g, liquid caustic soda 28g, boehmite 68.2g, Ludox 400g, be oriented to
Agent 222g after stirring evenly, obtains gel reaction mixture, is then warming up to 100 DEG C and stands crystallization 30 hours, be filtered, washed,
It is dried to obtain NaY molecular sieve, it is 89.8%, SiO to measure prepared NaY molecular sieve crystallinity with X- diffraction approaches2/Al2O3Mole
Than being 6.5.
The mother liquor being filtered, washed is collected, mother liquor N is remembered, analyzes its SiO2Content is 40.0g/l, Na2O content is 20.0g/l,
Proportion is 1.04.
Finally it should be noted that：It is above to implement to be merely illustrative of the technical solution of the present invention, rather than its limitations；Although ginseng
According to previous embodiment, invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be with
Technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；And
These modifications or replacements, the spirit and model of various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (8)
1. a kind of NaY molecular sieve synthetic method of high-efficiency cleaning, it is characterised in that：It synthesizes in the raw material of NaY molecular sieve without acid
Property silicon source, while at least containing one of following characteristics：
Aluminum silicon powder is also added with when a), preparing gel reaction mixture as the NaY silicon sources synthesized and silicon source, the aluminum silicon powder
Molecule molar ratio is (0.01 ~ 15) SiO2：(0.02~10)Al2O3：H2O, specific surface area is in 80 ~ 800m2/ g, pore volume exist
0.10~2.8ml/g；B), in NaY molecular sieve crystallization mother liquor direct reuse to the synthesis of NaY molecular sieve.
2. NaY molecular sieve synthetic method as described in claim 1, feature include following procedure：
1) directed agents, are prepared：Sodium metasilicate, sodium metaaluminate and water are pressed into mol ratio (10-30) Na20：A1203：(10-30)
Si02：(120-400) H20 mixing, by mixture at 15 DEG C ~ 60 DEG C, directed agents are made in 2 ~ 40h of aging；
2) gel reaction mixture, is prepared：It is under 10 DEG C ~ 90 DEG C stirring conditions, directed agents, silicon source, alkaline solution, NaY is female
Liquid, aluminum silicon powder or silicon source mix, and stir evenly, and gel reaction mixture are made, wherein gel reaction mixture rubs
Your proportioning is (1.3 ~ 3.8) Na20 :A1203 : (6-18) Si02 : (100-300) H20, the directed agents dosage accounts for solidifying
The 1% ~ 30% of glue reaction mixture total weight;
3) NaY zeolite, is synthesized：Above-mentioned gel reaction mixture is warming up to 80-120 DEG C of crystallization 6-40h, using filtering, wash
It washs, dry, NaY molecular sieve is made.
3. NaY molecular sieve synthetic method according to claim 1, it is characterised in that：The original of the synthesis NaY molecular sieve
Without acid silicon source in material, refer to without aluminum sulfate, aluminum nitrate, aluminium chloride, aluminum fluoride, aluminum phosphate, aluminium triformate, aluminum acetate or its
Mixture.
4. NaY molecular sieve synthetic method according to claim 1 or 2, it is characterised in that：The aluminum silicon powder is using as follows
It is prepared by method：Quartz sand, aluminium hydrate powder and soda ash (0.1 ~ 15) SiO in molar ratio2：(0.1~10)Al2O3：Na2O mixing is equal
Melt at 1100 DEG C ~ 1450 DEG C after even, add water that solution is made, with CO2Gas reaction, sediment through being filtered, washed, drying,
Obtain aluminum silicon powder.
5. NaY molecular sieve synthetic method according to claim 1, it is characterised in that：The NaY molecular sieve crystallization mother liquor
Refer to claim 2 process 3) liquid containing sodium metasilicate of the molecular sieve pulp through being filtered, washed of NaY after crystallization,
Its SiO2Content is usually no more than 110g/l.
6. NaY molecular sieve synthetic method according to claim 2, it is characterised in that：The process 2) in alkaline matter
For any one or more in sodium hydroxide, waterglass, sodium carbonate/bicarbonate and sodium metaaluminate.
7. NaY molecular sieve synthetic method according to claim 2, it is characterised in that：The process 2) in silicon source be silicon
Any one or more in aluminium powder, Ludox, waterglass, white carbon, sodium metasilicate.
8. NaY molecular sieve synthetic method according to claim 2, it is characterised in that：The process 2) in silicon source be silicon
Any one or more in aluminium powder, sodium metaaluminate, boehmite.
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| CN113149028A (en) * | 2021-05-31 | 2021-07-23 | 斯瑞尔环境科技股份有限公司 | Method for preparing NaY molecular sieve by using active silicon powder and recycling mother liquor |
| CN113277528A (en) * | 2021-05-31 | 2021-08-20 | 斯瑞尔环境科技股份有限公司 | Method for preparing NaY molecular sieve by using polyaluminium chloride as aluminum source and recycling mother liquor |
| CN116037195A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Low-coke catalytic cracking catalyst and preparation method thereof |
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| CN113104859A (en) * | 2021-05-31 | 2021-07-13 | 斯瑞尔环境科技股份有限公司 | Method for preparing NaY molecular sieve by using polyaluminium sulfate as aluminum source and recycling mother liquor |
| CN113149028A (en) * | 2021-05-31 | 2021-07-23 | 斯瑞尔环境科技股份有限公司 | Method for preparing NaY molecular sieve by using active silicon powder and recycling mother liquor |
| CN113277528A (en) * | 2021-05-31 | 2021-08-20 | 斯瑞尔环境科技股份有限公司 | Method for preparing NaY molecular sieve by using polyaluminium chloride as aluminum source and recycling mother liquor |
| CN116037195A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Low-coke catalytic cracking catalyst and preparation method thereof |
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