CN108529642A - A kind of preparation method of Cu-SSZ-13 molecular sieves - Google Patents
A kind of preparation method of Cu-SSZ-13 molecular sieves Download PDFInfo
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- C01B39/06—Preparation of isomorphous zeolites characterised by measures to replace the aluminium or silicon atoms in the lattice framework by atoms of other elements, i.e. by direct or secondary synthesis
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- 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
- C01B39/04—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 using at least one organic template directing agent, e.g. an ionic quaternary ammonium compound or an aminated compound
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Abstract
The present invention provides a kind of preparation methods of 13 molecular sieves of Cu SSZ, include the following steps：(1) silicon source, sodium hydroxide, Cu TEPA complex compounds and template are mixed with deionized water, is stirring evenly and then adding into silicon source, continued stirring to being uniformly mixed, obtain mixture；(2) by the mixture at 120~170 DEG C crystallization 48~96 hours, obtain crystallization product；(3) crystallization product is 8~12 hours dry at 80~120 DEG C, obtain desciccate；(4) desciccate is roasted 6~10 hours at 500~600 DEG C, obtains 13 molecular sieves of Cu SSZ.The molecular sieve is with a wide range of applications in fields such as petrochemical industry, MTO reactions, tail gas clean-up and fine chemistry industries, can be used to the NO in vehicle exhaust as catalystx。
Description
Technical field
The present invention relates to modified catalyst technical fields, and in particular to a kind of preparation method of Cu-SSZ-13 molecular sieves.
Background technology
In in the past few decades, nitrogen oxides (NOx) many environmental problems are had resulted in, such as：In acid rain and city
Photochemical fog, nitrogen oxides etc. in motor-vehicle tail-gas.In the U.S., European Union and Japan are a series of strictly to control nitrogenous oxygen
The regulation of compound exhaust emissions has been promulgated, the NO in exhaust gas is dischargedxContent be required control in a lower level.Cause
This development update, more effective tail gas clean-up technology become the hot spot studied instantly and the task of top priority.
In addition, in recent years since oil price rises suddenly and sharply, the technology for converting methanol into low-carbon alkene (MTO) causes people
Concern, in terms of research emphasis is concentrated mainly on screening of catalyst and preparation.The pore size of molecular sieve is smaller, catalysis choosing
Selecting property is better.
Since micro porous molecular sieve has unique physicochemical properties, it is set to be shown in more and more fields wide
Application prospect becomes the emphasis of research in recent years.Since 1948 successfully synthesize artificial zeolite, new zeolite constantly gushes
It is existing, it has been widely used in the fields such as petrochemical industry, metallurgy, intermetallic composite coating, machine-building, pesticide, environmental protection, has become industry
With a kind of important materials irreplaceable in agricultural.In the 1980s, passing through hydro-thermal method by Americanized scholar Zones S I
A kind of new molecular sieve SSZ-13 is synthesized.This zeolite is a kind of chabasie (CHA), its structure is by AlO4And SiO4Four
Face body is end to end by oxygen atom, and orderly is arranged in the elliposoidal crystal structure with octatomic ring structure, and pore size is only
There is 0.3nm.It is divided according to zeolite cavity size, SSZ-13 belongs to pore zeolite, and specific surface area reaches as high as 700m2/g.By
It is larger in specific surface area and with octatomic ring design feature, SSZ-13 have good thermal stability, can be used as adsorbent or
Carrier of catalyst, such as air purifying preparation, auto-exhaust catalyst etc..SSZ-13 also has cationic exchangeability and acid simultaneously
Property adjustability, thus to kinds of reaction have good catalytic performance, including hydrocarbon compound catalytic cracking, plus hydrogen split
Change and the construction reaction of alkene and aromatic hydrocarbons etc..For example, SSZ-13 is urged due to the features such as pore size is small, specific surface area is high in MTO
Changing has good catalytic effect in reaction, can obtain the low-carbon alkene of high yield, development prospect is extremely wide.
Further, Cu-SSZ-13 molecular sieves receive extensive concern because of its high catalytic activity and high hydrothermal stability.However
At present about Cu-SSZ-13 molecular sieves, due to the fact that, domestic and foreign literature is also relatively fewer.Cu-SSZ-13 points are prepared first
The template of son sieve is difficult to buy and expensive at home；Secondly, it is longer reaction time that Cu-SSZ-13 molecular sieves are prepared, this
Sample increases the cost for preparing molecular sieve Cu-SSZ-13.For these reasons, it needs to select best preparation process, reduces system
Standby cost, one-step method prepare Cu-SSZ-13 molecular sieve catalysts, it are made to be more advantageous to industrialized production.
In consideration of it, special propose the present invention.
Invention content
The purpose of the present invention is to provide a kind of preparation methods of Cu-SSZ-13 molecular sieves.
To achieve the above object, technical scheme is as follows：
The present invention relates to a kind of preparation methods of Cu-SSZ-13 molecular sieves, include the following steps：
(1) silicon source, sodium hydroxide, Cu-TEPA complex compounds and template are mixed with deionized water, is stirring evenly and then adding into
Silicon source continues stirring to being uniformly mixed, obtains mixture；
(2) by the mixture at 120~170 DEG C crystallization 48~96 hours, obtain crystallization product；
(3) crystallization product is 8~12 hours dry at 80~120 DEG C, obtain desciccate；
(4) desciccate is roasted 6~10 hours at 500~600 DEG C, obtains Cu-SSZ-13 molecular sieves.
Preferably, source of aluminium is selected from least one of sodium metaaluminate, aluminum hydroxide solid elastomer and boehmite.
Preferably, the silicon source is selected from least one of gas-phase silicon, ethyl orthosilicate, Ludox and white carbon.
Preferably, the molar ratio of source of aluminium, silicon source, sodium hydroxide, template and Cu-TEPA complex compounds be (0.02~
0.09):1：(0.02~0.26)：(0.01~0.35)：(0.01~0.08)：(10~43).
Preferably, the template is selected from N, N, and at least one in N- trimethyl adamantane ammonium hydroxide and choline chloride
Kind.
Preferably, the template is by N, N, the compound die of N- trimethyl adamantane ammonium hydroxide and choline chloride composition
The molar ratio of plate agent, the two is (1~5)：1.
Preferably, cetyl trimethylammonium bromide is additionally added as organic amine promoter in step (1).
Preferably, the molar ratio of organic amine promoter and the template is (0.1~0.5)：1.
Preferably, step (2) includes secondary crystallization process：
(i) by the mixture at 120~130 DEG C crystallization 10~15 hours, obtain crystallization intermediate product；
(ii) by the crystallization intermediate product at 150~170 DEG C crystallization 30~50 hours, obtain crystallization product.
Preferably, the crystallization product is carried out repeatedly washing to solution and is in neutrality by step (3) before being dried.
Beneficial effects of the present invention：
The silica alumina ratio of Cu-SSZ-13 molecular sieves prepared by the present invention is adjustable in the range of 10-40, and uses compound die
Plate agent, greatly reduces N, N, and dosage of the N- trimethyl adamantane ammonium hydroxide as single template reduces production cost.
The molecular sieve crystallinity is high, has good hydrothermal stability, specific surface area is up to 850m2/ g, average grain diameter 5-15 μm with
Interior, the yield of crystallization product is up to 95% or more.The molecular sieve is in petrochemical industry, MTO reactions, tail gas clean-up and fine chemistry industry etc.
Field is with a wide range of applications：It can be used to the NO in vehicle exhaust as catalystx, catalyst can be used as to use
In methanol-to-olefins (MTO) reaction process, adsorbent is also used as CO in methane gas2Separation.
Description of the drawings
Fig. 1 is the XRD spectra for the Cu-SSZ-13 molecular sieves that embodiment 1-1 is prepared.
Fig. 2 a and Fig. 2 b are the SEM figures for the Cu-SSZ-13 molecular sieves that embodiment 1-1 is prepared.
Fig. 3 a and Fig. 3 b are the SEM figures for the Cu-SSZ-13 molecular sieves that embodiment 1-5 is prepared.
Fig. 4 is the BET figures for the Cu-SSZ-13 molecular sieves that embodiment 1-1 is prepared.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, technical scheme of the present invention will be carried out below
Detailed description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art are obtained all without making creative work
Other embodiment belongs to the range that the present invention is protected.
The present invention relates to a kind of preparation methods of Cu-SSZ-13 molecular sieves, include the following steps：
(1) silicon source, sodium hydroxide, Cu-TEPA complex compounds and template are mixed with deionized water, is stirring evenly and then adding into
Silicon source continues stirring to being uniformly mixed, obtains mixture；
(2) by mixture at 120~170 DEG C crystallization 48~96 hours, obtain crystallization product；
(3) crystallization product is 8~12 hours dry at 80~120 DEG C, obtain desciccate；
(4) desciccate is roasted 6~10 hours at 500~600 DEG C, obtains Cu-SSZ-13 molecular sieves.
Wherein, Cu-TEPA complex compounds, which are reacted by copper sulphate with tetraethylenepentamine, is prepared.
In one embodiment of the invention, silicon source is in sodium metaaluminate, aluminum hydroxide solid elastomer and boehmite
It is at least one.
In one embodiment of the invention, silicon source in gas-phase silicon, ethyl orthosilicate, Ludox and white carbon extremely
Few one kind.
In one embodiment of the invention, mole of silicon source, silicon source, sodium hydroxide, template and Cu-TEPA complex compounds
Than for (0.02~0.09):1：(0.02~0.26)：(0.01~0.35)：(0.01~0.08)：(10~43).
In one embodiment of the invention, template is selected from N, N, N- trimethyl adamantane ammonium hydroxide and choline chloride
At least one of.
Further, it is preferable to which the template of the present invention is by N, N, N- trimethyl adamantane ammonium hydroxide and choline chloride group
At composite mould plate agent, the molar ratio of the two is (1~5)：1.N, N, N- trimethyl Buddha's warrior attendants can be reduced using composite mould plate agent
The dosage of alkane ammonium hydroxide reduces the synthesis cost of molecular sieve under the premise of ensureing molecular sieve quality.
In one embodiment of the invention, cetyl trimethylammonium bromide is additionally added as organic amine in step (1)
Accelerating agent.It acts as solubility of the organic amine template in gel is improved, to be prepared uniform Cu-SSZ-13 points
Son sieve synthesis initial gel mixture.
In one embodiment of the invention, the molar ratio of organic amine promoter and template is (0.1~0.5)：1.
In one embodiment of the invention, step (2) includes secondary crystallization process：
(i) by mixture at 120~130 DEG C crystallization 10~15 hours, obtain crystallization intermediate product；
(ii) by crystallization intermediate product at 150~170 DEG C crystallization 30~50 hours, obtain crystallization product.
In one embodiment of the invention, crystallization product repeatedly wash to molten by step (3) before being dried
Liquid is in neutrality.
In one particular embodiment of the present invention, Cu-SSZ-13 molecular sieves are prepared by the following method to obtain：
(1) according to aforementioned proportion, silicon source, sodium hydroxide, Cu-TEPA complex compounds, composite mould plate agent and organic amine are promoted
Agent is mixed with deionized water, is stirring evenly and then adding into silicon source, is continued stirring to being uniformly mixed, is obtained mixture；
(2) said mixture is fitted into the stainless steel synthesis reactor of inner liner polytetrafluoroethylene, closed carry out secondary crystallization, i.e.,
Crystallization 10~15 hours at 120~130 DEG C, then crystallization 30~50 hours at 150~170 DEG C, obtain crystallization product；
(3) crystallization product is carried out repeatedly washing to solution to be in neutrality, then by crystallization product dry 8 at 80~120 DEG C
~12 hours, obtain desciccate；
(4) desciccate is roasted 6~10 hours at 500~600 DEG C, obtains Cu-SSZ-13 molecular sieves.
Embodiment 1
(1) sodium metaaluminate, sodium hydroxide, Cu-TEPA complex compounds, template and organic amine promoter and deionized water are mixed
It closes, is stirring evenly and then adding into Ludox, continue stirring to being uniformly mixed, obtain mixture.The molar ratio of each material is shown in Table 1；
(2) by mixture at 120~170 DEG C crystallization 48~96 hours, obtain crystallization product, crystallization parameter is shown in Table 1；
(3) crystallization product is 10 hours dry at 100 DEG C, obtain desciccate；
(4) desciccate is roasted 8 hours at 550 DEG C, obtains Cu-SSZ-13 molecular sieves.
Table 1
X-ray diffraction test is carried out to the Cu-SSZ-13 molecular sieves that embodiment 1-1 is prepared, XRD spectra is shown in Fig. 1.
It can be seen that spectral line is smooth, and free from admixture peak, and crystallinity is good.
Electronic Speculum test is scanned to embodiment 1-1 and 1-5 the Cu-SSZ-13 molecular sieves being prepared, SEM figures are shown in figure
2a and Fig. 2 b (corresponding embodiment 1-1) and Fig. 3 a and Fig. 3 b (corresponding embodiment 1-5).As can be seen that passing through secondary crystallization mistake
The particle of journey, molecular sieve surface significantly reduces, and crystal grain obtains more regular pattern.
The Cu-SSZ-13 molecular sieves that embodiment 1-1 is prepared are carried out comparing table using nitrogen adsorption-desorption (BET) method
Area and test, BET spectrograms are shown in Fig. 4.It can be seen that its adsorptivity is relatively stable, it is reachable that its specific surface area is calculated
850m2/g。
Diesel car tail gas refining is carried out to the Cu-SSZ-13 molecular sieves that embodiment 1-1 to 1-5 is prepared, is in air speed
400000h-1Under conditions of tested, 250 DEG C of reaction temperature, NOxConversion results are shown in Table 2.
Table 2
| Embodiment | NOxConversion ratio/% |
| 1-1 | 98 |
| 1-2 | 95 |
| 1-3 | 90 |
| 1-4 | 91 |
| 1-5 | 94 |
As known from Table 2, the NO of embodiment 1-1 to 1-5x90% or more, wherein embodiment 1-1 can reach conversion ratio
98%, there is very excellent catalytic activity.When using single template, not using organic amine promoter, or carry out a crystallization
When, NOxConversion ratio has different degrees of decline.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
Claims (10)
1. a kind of preparation method of Cu-SSZ-13 molecular sieves, which is characterized in that include the following steps：
(1) silicon source, sodium hydroxide, Cu-TEPA complex compounds and template are mixed with deionized water, is stirring evenly and then adding into silicon
Source continues stirring to being uniformly mixed, obtains mixture；
(2) by the mixture at 120~170 DEG C crystallization 48~96 hours, obtain crystallization product；
(3) crystallization product is 8~12 hours dry at 80~120 DEG C, obtain desciccate；
(4) desciccate is roasted 6~10 hours at 500~600 DEG C, obtains Cu-SSZ-13 molecular sieves.
2. according to the method described in claim 1, it is characterized in that, source of aluminium be selected from sodium metaaluminate, aluminum hydroxide solid elastomer and
At least one of boehmite.
3. according to the method described in claim 1, it is characterized in that, the silicon source is selected from gas-phase silicon, ethyl orthosilicate, Ludox
At least one of with white carbon.
4. according to the method described in claim 1, it is characterized in that, source of aluminium, silicon source, sodium hydroxide, template and Cu-
The molar ratio of TEPA complex compounds is (0.02~0.09):1：(0.02~0.26)：(0.01~0.35)：(0.01~0.08):(10
~43).
5. according to the method described in claim 1, it is characterized in that, the template is selected from N, N, N- trimethyl adamantane hydrogen-oxygens
Change at least one of ammonium and choline chloride.
6. according to the method described in claim 5, it is characterized in that, the template is by N, N, N- trimethyl adamantane hydrogen-oxygens
Change the composite mould plate agent of ammonium and choline chloride composition, the molar ratio of the two is (1~5)：1.
7. according to the method described in claim 1, it is characterized in that, being additionally added cetyl trimethylammonium bromide in step (1)
As organic amine promoter.
8. the method according to the description of claim 7 is characterized in that the molar ratio of organic amine promoter and the template
For (0.1~0.5)：1.
9. according to the method described in claim 1, it is characterized in that, step (2) includes secondary crystallization process：
(i) by the mixture at 120~130 DEG C crystallization 10~15 hours, obtain crystallization intermediate product；
(ii) by the crystallization intermediate product at 150~170 DEG C crystallization 30~50 hours, obtain crystallization product.
10. according to the method described in claim 1, it is characterized in that, step (3) before being dried, by the crystallization product
Repeatedly washing to solution is carried out to be in neutrality.
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Cited By (9)
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| CN109319806A (en) * | 2018-10-08 | 2019-02-12 | 中海油天津化工研究设计院有限公司 | A kind of method of the integral formula SSZ-13 molecular sieve of mixed templates dry glue |
| CN109364989A (en) * | 2018-11-20 | 2019-02-22 | 中国科学院生态环境研究中心 | A kind of modified Cu-SSZ-13 catalyst and its preparation method and application |
| CN109399661A (en) * | 2018-12-02 | 2019-03-01 | 天津大沽化工股份有限公司 | A kind of preparation method of Fe-SSZ-24 molecular sieve |
| CN110201711A (en) * | 2019-07-11 | 2019-09-06 | 中国华能集团有限公司 | A kind of catalyst and preparation method thereof of hydrogenation of carbon dioxide synthesizing low-carbon mixed alcohol |
| CN111298831A (en) * | 2019-11-25 | 2020-06-19 | 上海绿强新材料有限公司 | Preparation method of SSZ-13 molecular sieve for MTO catalytic reaction |
| CN111943224A (en) * | 2020-08-18 | 2020-11-17 | 桂林理工大学 | Preparation method of Cu-SSZ-13 molecular sieve catalyst, obtained product and application |
| CN112939020A (en) * | 2021-04-09 | 2021-06-11 | 南京诚志清洁能源有限公司 | Stepped crystallization preparation method and application of Cu-SSZ-13 molecular sieve catalyst |
| CN114655963A (en) * | 2022-03-31 | 2022-06-24 | 山东泓泰恒瑞新材料有限公司 | Preparation method of SSZ-13 molecular sieve composite material |
| CN115140745A (en) * | 2021-03-30 | 2022-10-04 | 中国石油化工股份有限公司 | Metal modified hierarchical pore ZSM-5 molecular sieve and preparation method thereof |
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| CN111298831B (en) * | 2019-11-25 | 2022-10-25 | 上海绿强新材料有限公司 | Preparation method of SSZ-13 molecular sieve for MTO catalytic reaction |
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| CN111943224A (en) * | 2020-08-18 | 2020-11-17 | 桂林理工大学 | Preparation method of Cu-SSZ-13 molecular sieve catalyst, obtained product and application |
| CN115140745A (en) * | 2021-03-30 | 2022-10-04 | 中国石油化工股份有限公司 | Metal modified hierarchical pore ZSM-5 molecular sieve and preparation method thereof |
| CN115140745B (en) * | 2021-03-30 | 2023-11-10 | 中国石油化工股份有限公司 | Metal modified hierarchical pore ZSM-5 molecular sieve and preparation method thereof |
| CN112939020A (en) * | 2021-04-09 | 2021-06-11 | 南京诚志清洁能源有限公司 | Stepped crystallization preparation method and application of Cu-SSZ-13 molecular sieve catalyst |
| CN112939020B (en) * | 2021-04-09 | 2023-09-29 | 南京诚志清洁能源有限公司 | Stepped crystallization preparation method and application of Cu-SSZ-13 molecular sieve catalyst |
| CN114655963A (en) * | 2022-03-31 | 2022-06-24 | 山东泓泰恒瑞新材料有限公司 | Preparation method of SSZ-13 molecular sieve composite material |
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