CN110479357A - A kind of preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer - Google Patents
A kind of preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer Download PDFInfo
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- CN110479357A CN110479357A CN201910658915.4A CN201910658915A CN110479357A CN 110479357 A CN110479357 A CN 110479357A CN 201910658915 A CN201910658915 A CN 201910658915A CN 110479357 A CN110479357 A CN 110479357A
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- porous ceramics
- integral catalyzer
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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
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
- B01J29/72—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65 containing iron group metals, noble metals or copper
- B01J29/76—Iron group metals or copper
- B01J29/7676—MWW-type, e.g. MCM-22, ERB-1, ITQ-1, PSH-3 or SSZ-25
Abstract
The present invention provides a kind of preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer characterized by comprising step 1: being pre-processed using dust technology to cellular ceramic substrate；Step 2: silicon source and silicon source being mixed, adjusting pH is alkalinity, obtains precursor liquid, and organic formwork agent Cu-TEPA complex compound is added, obtains mixed liquor；Step 3: resulting mixed liquor being placed in hydrothermal reaction kettle together with pretreated cellular ceramic substrate and carries out crystallization, is taken out, roasting removal organic formwork agent obtains Cu-SSZ-13/ porous ceramics integral catalyzer.The present invention goes out Cu-SSZ-13/ porous ceramics integral catalyzer as template fabricated in situ using cheap Cu-TEPA, and simple process, pollution is few, at low cost, is suitble to industrialization large-scale application.
Description
Technical field
The present invention relates to the preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer, belong to compound technology of preparing
Field.
Background technique
SSZ-13 is by AlO4And SiO2Tetrahedron is end to end by oxygen atom, is arranged in an orderly manner with octatomic ring knot
The spherical cage (0.73nm × 1.2nm) and three dimensional intersection cellular structure of structure, pore size 0.38nm × 0.38nm, due to SSZ-13
Have the characteristics that orderly cellular structure, good hydrothermal stability, there is more surface plasmon acid site and tradable cation to exist
Having good denitration performance after supported copper, thus to be widely used in vehicle exhaust out of stock.Patent CN103157505 B is just reported
A kind of preparation method of Cu-SSZ-13 catalyst is used for denitration reaction, excellent activity and hydrothermal stability, is applicable in very much
The catalytic purification of nitroxide in diesel vehicle.In industrial application, it is necessary to be prepared into integral catalyzer, such as honeycomb
Catalyst improves catalysis and heat transfer efficiency.Patent CN102099293B, which is just reported, to be urged using the method for coating with regard to Cu-SSZ-13
Agent achieves efficient catalytic activity coated in monolithic catalyst is prepared on porous ceramics for denitration reaction.But it applies
The catalyst of the method for applying preparation, coated weight is few, and strength of coating is poor, the preparation easy to fall off for restricting catalyst always.
Existing technology uses N, N mostly, and N- trimethyl adamantane ammonium hydroxide synthesizes SSZ-13 as template, but
It is N, N, the price is very expensive for N- trimethyl adamantane ammonium hydroxide, and it is high to frequently can lead to molecular sieve cost.
Summary of the invention
It is an object of the present invention to provide a kind of using cheap Cu-TEPA as template, and fabricated in situ goes out Cu-SSZ-13/
The method of porous ceramics integral catalyzer.
In order to achieve the above object, the present invention provides a kind of preparations of Cu-SSZ-13/ porous ceramics integral catalyzer
Method characterized by comprising
Step 1: cellular ceramic substrate being pre-processed using dust technology；
Step 2: silicon source and silicon source being mixed, adjusting pH is alkalinity, obtains precursor liquid, and organic formwork agent Cu-TEPA is added
Complex compound obtains mixed liquor；
Step 3: resulting mixed liquor being placed in hydrothermal reaction kettle together with pretreated cellular ceramic substrate and is carried out
Crystallization is taken out, and roasting removal organic formwork agent obtains Cu-SSZ-13/ porous ceramics integral catalyzer.
Preferably, the hole density of the cellular ceramic substrate in the step 1 is in (the hole per square inch 200~400cpsi
Number) and wall thickness be 2~6.5mil.
Preferably, the mass content of the dust technology in the step 1 is 15%~20%.
Preferably, the silicon source in the step 2 is SiO2, one or more of ethyl orthosilicate and silicic acid.
Preferably, the silicon source in the step 2 is aluminium isopropoxide, aluminum sulfate, sodium metaaluminate, aluminium hydroxide, aluminum sulfate
Potassium, one or more of aluminium chloride and aluminium oxide.
Preferably, the raw material for preparing of the Cu-TEPA complex compound includes copper source and tetraethylenepentamine.
Preferably, the copper source be one of copper sulphate, copper acetate, copper nitrate, copper chloride and cuprammonium complex or
It is several.
Preferably, in the copper source molar ratio of the copper contained and tetraethylenepentamine be 0.5~2:1, preferably 1~
1.5:1.
Preferably, SiO in reaction system when the amount ratio of the silicon source in the step 2 and silicon source meets crystallization2With
Al2O3Initial molar ratio be 10~50:1, preferably 15~35:1.
Preferably, when the dosage of the Cu-TEPA complex compound meets crystallization in reaction system Cu-TEPA complex compound with
SiO2Initial molar ratio be 0.1~0.5:1, preferably 0.1~0.3:1.
Preferably, the pH is 10~14, preferably 13~14.
Preferably, the crystallization time is 1~7 day, preferably 3~5 days.
Preferably, the maturing temperature is 450~600 DEG C, preferably 550~600 DEG C.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention goes out Cu-SSZ-13/ porous ceramics monoblock type as template fabricated in situ using cheap Cu-TEPA
Catalyst, simple process, pollution is few, at low cost, is suitble to industrialization large-scale application.
2, it is monolithic porous to prepare Cu-SSZ-13/ in porous ceramics previous step method fabricated in situ Cu-SSZ-13 by the present invention
Ceramic catalyst, coating are firmly combined with carrier, and coating uniform is not easily to fall off, and catalytic performance is high.
3, preparation process of the present invention is simple, prepares catalyst compared to coating process and greatly shortens preparation time, reduces cost,
It can industrialization large-scale production.
4, catalyst prepared by the present invention is used for the purposes of diesel car tail gas refining denitration, and it is living to be applied to catalytic eliminating NOx
Property it is high, water resistant heat ageing activity is good.
Detailed description of the invention
Fig. 1 is the XRD diagram of Cu-SSZ-13/ porous ceramics integral catalyzer obtained in Examples 1 and 2；
Fig. 2 is the XRD diagram of Cu-SSZ-13/ porous ceramics integral catalyzer obtained in embodiment 3 and 4.
Specific embodiment
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, those skilled in the art
Member can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Range.
Used each raw material is commercial product in following embodiment.
Embodiment 1
The present embodiment provides a kind of preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer, comprising:
(1) pretreatment of cellular ceramic substrate
Cellular cellular ceramic substrate cordierite (specification: 400cpsi, 6.5mil) is cut into 10mm × 10mm × 10mm
The square of size is blocky, is then soaked in the dilute nitric acid solution that mass content is 15%, is located in advance at 80 DEG C
2h is managed, neutrality is then washed with deionized, it is stand-by after drying.
(2) catalyst preparation
Using ethyl orthosilicate as silicon source, aluminium isopropoxide is silicon source.Silicon source and water are mixed, isopropanol is stirring evenly and then adding into
Aluminium mixing adds sodium hydroxide and adjusts pH=13~14, obtains precursor liquid.The amount ratio of silicon source, silicon source and water meets crystallization
When reaction system in SiO2、Al2O3Molar ratio with water is 30:1:120.Copper acetate is added in tetraethylenepentamine (TEPA)
(Cu:TEPA molar ratio is 0.5:1), is stirred, obtains Cu-TEPA complex compound.After precursor liquid is emulsified 2h, organic mould is added
Plate agent Cu-TEPA complex compound, Cu-TEPA complex compound and SiO in reaction system when the dosage of Cu-TEPA complex compound meets crystallization2
Initial molar ratio be 0.1:1, obtain mixed liquor.After stirring 2 hours by above-mentioned mixed liquor together with pretreated cordierite
It is placed in hydrothermal reaction kettle, crystallization 3 days at 170 DEG C, takes out cordierite and wash to neutrality, 3 hours removal moulds are roasted at 600 DEG C
Plate agent obtains Cu-SSZ-13/ porous ceramics integral catalyzer, sees attached drawing 1, shows that the molecular sieve being synthesized is by XRD
The characteristic peak of SSZ-13, and copper content high degree of dispersion does not have apparent characteristic peak.
Embodiment 2
The present embodiment provides a kind of preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer, comprising:
(1) pretreatment of cellular ceramic substrate
It is big that cellular cellular ceramic substrate cordierite (specification: 600cpsi, 4mil) is cut into 10mm × 10mm × 10mm
Small square is blocky, is then soaked in the dilute nitric acid solution that mass content is 20%, 3h is pre-processed at 85 DEG C, so
After neutrality is washed with deionized, it is stand-by after drying.
(2) catalyst preparation
Using ethyl orthosilicate as silicon source, aluminium isopropoxide is silicon source, and silicon source and water are mixed, isopropanol is stirring evenly and then adding into
Aluminium mixing adds sodium hydroxide and adjusts pH=13~14, obtains precursor liquid.The amount ratio of silicon source, silicon source and water meets crystallization
When reaction system in SiO2、Al2O3Molar ratio with water is 30:1:120.Copper acetate is added in tetraethylenepentamine (Cu:
TEPA molar ratio is 2:1), it is stirred, obtains Cu-TEPA complex compound, after precursor liquid is emulsified 2h, organic formwork agent is added
Cu-TEPA complex compound, Cu-TEPA complex compound and SiO in reaction system when the dosage of Cu-TEPA complex compound meets crystallization2Just
Beginning molar ratio is 0.4:1, obtains mixed liquor.Above-mentioned mixed liquor is placed in by stirring after 2 hours together with pretreated cordierite
In hydrothermal reaction kettle, crystallization 3 days at 170 DEG C are taken out cordierite and are washed to neutrality, roast 3 hours at 600 DEG C and remove removing template
Agent obtains Cu-SSZ-13/ porous ceramics integral catalyzer, sees attached drawing 1, shows that the molecular sieve being synthesized is by XRD
The characteristic peak of SSZ-13, and copper content high degree of dispersion does not have apparent characteristic peak)
Embodiment 3
The present embodiment provides a kind of preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer, comprising:
(1) pretreatment of cellular ceramic substrate
It is big that cellular cellular ceramic substrate cordierite (specification: 600cpsi, 4mil) is cut into 10mm × 10mm × 10mm
Small square is blocky, is then soaked in the dilute nitric acid solution that mass content is 20%, 3h is pre-processed at 85 DEG C, so
After neutrality is washed with deionized, it is stand-by after drying.
(2) catalyst preparation
Using ethyl orthosilicate as silicon source, aluminum sulfate is silicon source, and silicon source and water are mixed, and it is mixed to be stirring evenly and then adding into aluminum sulfate
It closes, adds sodium hydroxide and adjust pH=13~14, obtain precursor liquid.The amount ratio of silicon source, silicon source and water meets anti-when crystallization
Answer SiO in system2、Al2O3Molar ratio with water is 30:1:120.Copper sulphate is added in tetraethylenepentamine, (Cu:TEPA rubs
You are than being 2:1), it is stirred, obtains Cu-TEPA complex compound, after precursor liquid is emulsified 2h, organic formwork agent Cu-TEPA is added
Complex compound, Cu-TEPA complex compound and SiO in reaction system when the dosage of Cu-TEPA complex compound meets crystallization2Initial molar ratio
For 0.4:1, mixed liquor is obtained.Above-mentioned mixed liquor is placed in hydro-thermal reaction together with pretreated cordierite after stirring 2 hours
In kettle, crystallization 3 days at 170 DEG C are taken out cordierite and are washed to neutrality, roast 3 hours at 600 DEG C and remove template agent removing, obtain Cu-
SSZ-13/ porous ceramics integral catalyzer.See attached drawing 2, shows that the molecular sieve being synthesized is the feature of SSZ-13 by XRD
Peak, and copper content high degree of dispersion does not have apparent characteristic peak.
Embodiment 4
The present embodiment provides a kind of preparation methods of Cu-SSZ-13/ porous ceramics integral catalyzer, comprising:
(1) pretreatment of cellular ceramic substrate
It is big that cellular cellular ceramic substrate cordierite (specification: 400cpsi, 2mil) is cut into 10mm × 10mm × 10mm
Small square is blocky, is then soaked in the dilute nitric acid solution that mass content is 20%, 3h is pre-processed at 85 DEG C, so
After neutrality is washed with deionized, it is stand-by after drying.
(2) catalyst preparation
Using silica as silicon source, sodium metaaluminate is silicon source.Silicon source and water are mixed, it is mixed to be stirring evenly and then adding into aluminum sulfate
It closes, adds sodium hydroxide and adjust pH=13~14, obtain precursor liquid.The amount ratio of silicon source, silicon source and water meets anti-when crystallization
Answer SiO in system2、Al2O3Molar ratio with water is 30:2:120.Copper nitrate is added in tetraethylenepentamine to (Cu:TEPA rubs
You are than being 2:1), it is stirred, obtains Cu-TEPA complex compound.After precursor liquid is emulsified 2h, organic formwork agent Cu-TEPA is added
Complex compound, Cu-TEPA complex compound and SiO in reaction system when the dosage of Cu-TEPA complex compound meets crystallization2Initial molar ratio
For 0.4:1, mixed liquor is obtained.Above-mentioned mixed liquor is placed in hydro-thermal reaction together with pretreated cordierite after stirring 2 hours
In kettle, crystallization 3 days at 170 DEG C are taken out cordierite and are washed to neutrality, roast 3 hours at 600 DEG C and remove template agent removing, obtain Cu-
SSZ-13/ porous ceramics integral catalyzer.See attached drawing 2, shows that the molecular sieve being synthesized is the feature of SSZ-13 by XRD
Peak, and copper content high degree of dispersion does not have apparent characteristic peak)
Catalyst prepared by above-described embodiment is investigated into its catalytic denitration performance, experiment condition is as follows: 500ppm NO,
500ppm NH3, 10%O2, 10%H2O, volume space velocity 80000h-1.Catalytic performance is as shown in table 1.
The catalytic performance of 1 fresh catalyst of table
| Embodiment | Temperature (DEG C) | NO conversion ratio (%) | Temperature (DEG C) | NO conversion ratio (%) |
| 1 | 150 | 65 | 400 | 80 |
| 2 | 150 | 72 | 400 | 86 |
| 3 | 150 | 70 | 400 | 84 |
| 4 | 150 | 67 | 400 | 82 |
In practical applications, catalyst anti-aging property index is also extremely important, thus by re-test after catalyst aging its
Denitration performance.Denitration performance experiment condition is same as above, hydrothermal aging conditions: 10%H at 800 DEG C2O pre-processes 50h.Catalytic performance is shown in
Table 2.
The catalytic performance of 2 aging rear catalyst of table
| Embodiment | Temperature (DEG C) | NO conversion ratio (%) | Temperature (DEG C) | NO conversion ratio (%) |
| 1 | 150 | 55 | 400 | 70 |
| 2 | 150 | 64 | 400 | 76 |
| 3 | 150 | 61 | 400 | 70 |
| 4 | 150 | 60 | 400 | 72 |
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.
Claims (10)
1. a kind of preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer characterized by comprising
Step 1: cellular ceramic substrate being pre-processed using dust technology；
Step 2: silicon source and silicon source being mixed, adjusting pH is alkalinity, obtains precursor liquid, and organic formwork agent Cu-TEPA complexing is added
Object obtains mixed liquor；
Step 3: resulting mixed liquor is placed in hydrothermal reaction kettle together with pretreated cellular ceramic substrate and carries out crystallization,
It takes out, roasting removal organic formwork agent obtains Cu-SSZ-13/ porous ceramics integral catalyzer.
2. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
The hole density of cellular ceramic substrate in the step 1 stated is in 200~400cpsi and wall thickness is 2~6.5mil.
3. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
The mass content of dust technology in the step 1 stated is 15%~20%.
4. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
Silicon source in the step 2 stated is SiO2, one or more of ethyl orthosilicate and silicic acid；Silicon source in the step 2 is
Aluminium isopropoxide, aluminum sulfate, sodium metaaluminate, aluminium hydroxide, aluminum aluminum sulfate, one or more of aluminium chloride and aluminium oxide.
5. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
The raw material for preparing for the Cu-TEPA complex compound stated includes copper source and tetraethylenepentamine；The copper source is copper sulphate, copper acetate, nitre
One or more of sour copper, copper chloride and cuprammonium complex；Mole of the copper and tetraethylenepentamine that contain in the copper source
Than for 0.5~2:1.
6. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
SiO in reaction system when the amount ratio of silicon source and silicon source in the step 2 stated meets crystallization2And Al2O3Initial molar ratio be 10
~50:1.
7. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
Cu-TEPA complex compound and SiO in reaction system when the dosage for the Cu-TEPA complex compound stated meets crystallization2Initial molar ratio be
0.1~0.5:1.
8. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
The pH stated is 10~14.
9. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that institute
The crystallization time stated is 1~7 day.
10. the preparation method of Cu-SSZ-13/ porous ceramics integral catalyzer as described in claim 1, which is characterized in that
The maturing temperature is 450~600 DEG C.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103157505A (en) * | 2013-03-25 | 2013-06-19 | 中国科学院生态环境研究中心 | Cu-SSZ-13 catalyst, and preparation method and application thereof |
| CN106238092A (en) * | 2016-07-13 | 2016-12-21 | 无锡威孚环保催化剂有限公司 | The method of one-step synthesis method Cu SSZ 13 molecular sieve catalyst |
| CN108786900A (en) * | 2018-06-21 | 2018-11-13 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of Cu-SSZ-13 molecular sieve catalysts and products thereof and application |
| CN109499608A (en) * | 2019-01-07 | 2019-03-22 | 上海国瓷新材料技术有限公司 | A kind of Cu-SSZ-13/ porous ceramic catalyst and the preparation method and application thereof |
| CN109731609A (en) * | 2019-01-07 | 2019-05-10 | 上海国瓷新材料技术有限公司 | A kind of Cu-SSZ-13/ porous ceramic catalyst and the preparation method and application thereof that coating is controllable |
| CN109761244A (en) * | 2019-01-16 | 2019-05-17 | 山东国瓷功能材料股份有限公司 | A kind of Cu-SSZ-13 molecular sieve and the preparation method and application thereof |
-
2019
- 2019-07-22 CN CN201910658915.4A patent/CN110479357A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103157505A (en) * | 2013-03-25 | 2013-06-19 | 中国科学院生态环境研究中心 | Cu-SSZ-13 catalyst, and preparation method and application thereof |
| CN106238092A (en) * | 2016-07-13 | 2016-12-21 | 无锡威孚环保催化剂有限公司 | The method of one-step synthesis method Cu SSZ 13 molecular sieve catalyst |
| CN108786900A (en) * | 2018-06-21 | 2018-11-13 | 上海纳米技术及应用国家工程研究中心有限公司 | Preparation method of Cu-SSZ-13 molecular sieve catalysts and products thereof and application |
| CN109499608A (en) * | 2019-01-07 | 2019-03-22 | 上海国瓷新材料技术有限公司 | A kind of Cu-SSZ-13/ porous ceramic catalyst and the preparation method and application thereof |
| CN109731609A (en) * | 2019-01-07 | 2019-05-10 | 上海国瓷新材料技术有限公司 | A kind of Cu-SSZ-13/ porous ceramic catalyst and the preparation method and application thereof that coating is controllable |
| CN109761244A (en) * | 2019-01-16 | 2019-05-17 | 山东国瓷功能材料股份有限公司 | A kind of Cu-SSZ-13 molecular sieve and the preparation method and application thereof |
Non-Patent Citations (2)
| Title |
|---|
| 彭兆亮 等: "HF对Cu-SSZ-13/堇青石的原位合成及脱除NOx的影响", 《环境化学》 * |
| 高志娟: "Cu-SAPO-34/堇青石和Cu-SSZ-13/堇青石的原位合成及其对柴油车尾气中NOx的脱除", 《中国优秀博硕士学位论文全文数据库（硕士） 工程科技I缉》 * |
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Application publication date: 20191122 |