CN112159515A - Based on SiO2Method for preparing TEMPO free radical functionalized hollow conjugated microporous polymer by using template and application - Google Patents
Based on SiO2Method for preparing TEMPO free radical functionalized hollow conjugated microporous polymer by using template and application Download PDFInfo
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- CN112159515A CN112159515A CN202010947267.7A CN202010947267A CN112159515A CN 112159515 A CN112159515 A CN 112159515A CN 202010947267 A CN202010947267 A CN 202010947267A CN 112159515 A CN112159515 A CN 112159515A
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- tempo
- microporous polymer
- conjugated microporous
- sio
- free radical
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- 239000013317 conjugated microporous polymer Substances 0.000 title claims abstract description 69
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 150000003254 radicals Chemical class 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 40
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 34
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims abstract description 30
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims abstract description 30
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 29
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- YNHIGQDRGKUECZ-UHFFFAOYSA-N dichloropalladium;triphenylphosphanium Chemical compound Cl[Pd]Cl.C1=CC=CC=C1[PH+](C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1[PH+](C=1C=CC=CC=1)C1=CC=CC=C1 YNHIGQDRGKUECZ-UHFFFAOYSA-N 0.000 claims description 2
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- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 2
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- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 description 3
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- JCWIWBWXCVGEAN-UHFFFAOYSA-L cyclopentyl(diphenyl)phosphane;dichloropalladium;iron Chemical compound [Fe].Cl[Pd]Cl.[CH]1[CH][CH][CH][C]1P(C=1C=CC=CC=1)C1=CC=CC=C1.[CH]1[CH][CH][CH][C]1P(C=1C=CC=CC=1)C1=CC=CC=C1 JCWIWBWXCVGEAN-UHFFFAOYSA-L 0.000 description 2
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- ZDRMMTYSQSIGRY-UHFFFAOYSA-N 1,3,5-triethynylbenzene Chemical compound C#CC1=CC(C#C)=CC(C#C)=C1 ZDRMMTYSQSIGRY-UHFFFAOYSA-N 0.000 description 1
- YJTKZCDBKVTVBY-UHFFFAOYSA-N 1,3-Diphenylbenzene Chemical group C1=CC=CC=C1C1=CC=CC(C=2C=CC=CC=2)=C1 YJTKZCDBKVTVBY-UHFFFAOYSA-N 0.000 description 1
- MVLGANVFCMOJHR-UHFFFAOYSA-N 1,4-diethynylbenzene Chemical compound C#CC1=CC=C(C#C)C=C1 MVLGANVFCMOJHR-UHFFFAOYSA-N 0.000 description 1
- LJEYERVJYRUKPJ-UHFFFAOYSA-N 1-(3,6,8-triacetylpyren-1-yl)ethanone Chemical compound CC(=O)c1cc(C(C)=O)c2ccc3c(cc(C(C)=O)c4ccc1c2c34)C(C)=O LJEYERVJYRUKPJ-UHFFFAOYSA-N 0.000 description 1
- OYNOCRWQLLIRON-UHFFFAOYSA-N 1-n,3-n-bis(2,2,6,6-tetramethylpiperidin-4-yl)benzene-1,3-dicarboxamide Chemical group C1C(C)(C)NC(C)(C)CC1NC(=O)C1=CC=CC(C(=O)NC2CC(C)(C)NC(C)(C)C2)=C1 OYNOCRWQLLIRON-UHFFFAOYSA-N 0.000 description 1
- KSZVOXHGCKKOLL-UHFFFAOYSA-N 4-Ethynyltoluene Chemical compound CC1=CC=C(C#C)C=C1 KSZVOXHGCKKOLL-UHFFFAOYSA-N 0.000 description 1
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
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- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
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Abstract
Based on SiO2A method for preparing a TEMPO free radical functionalized hollow conjugated microporous polymer by using a template and application thereof. The method comprises the following steps: palladium catalyst, cuprous iodide and SiO2Adding the nano microspheres into an organic solvent, and stirring for 0.5-1.5 h under the nitrogen protection environment to obtain a mixed solution; adding aromatic acetylene monomers and TEMPO free radical functional monomers into the mixed solution, heating to 90-110 ℃, and reacting for 24h-Obtaining the SiO coated by the TEMPO free radical functionalized porous material after 50h2Functionalized conjugated microporous polymer material (SiO)2@ CMPs-TEMPO); mixing SiO2Drying the @ CMPs-TEMPO, adding into hydrofluoric acid water solution, stirring for 2-4 h, and etching SiO2After being washed, the obtained product is centrifuged to obtain the TEMPO free radical functionalized hollow conjugated microporous polymer material (HCMPs-TEMPO). The TEMPO free radical functionalized hollow conjugated microporous polymer material can efficiently catalyze the oxidation of alcohol organic matters.
Description
Technical Field
The invention relates to a SiO-based material2A functionalized hollow conjugated microporous polymer nano-catalyst prepared by a template belongs to the technical field of nano-catalysts.
Background
The catalytic oxidation reaction of alcohol plays an important role in chemical production, and catalysts used in the catalytic oxidation reaction of alcohol in chemical production, such as oxidants of manganese oxide, chromium oxide, high-valence iodine and the like, may be associated with pollutants containing heavy metal elements in the using process, and easily cause the alcohol to be over-oxidized. Based on the necessity and urgency of environmental protection, in chemical experiments and production, how to search for more environmentally friendly and efficient environmentally friendly catalysts becomes a research focus.
Conjugated Microporous Polymers (CMPs) are a class of organic porous materials with a microporous structure, a high specific surface area, high chemical stability and thermal stability. The functionalized CMPs can be constructed by reasonably designing structures and monomers with different functional groups, and can be applied to the fields of gas adsorption/storage, toxic pollutant capture, sensors, catalysis and the like. However, conventional CMPs are typically spherical or bulk solid powders on the micron or even millimeter scale, limiting the rate of diffusion of substrates and products in the catalyzed reaction. Therefore, the preparation of the CMPs with the nano-scale and hollow structures can effectively improve the specific surface area of the CMPs and the diffusion rate of the substrate and the product, and is expected to become a new generation of high-efficiency heterogeneous catalyst.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a SiO-based material2Template preparation of functionalized hollow conjugated microporous polymer (SiO)2@ CMPs-TEMPO).
The invention also aims to provide a functionalized hollow conjugated microporous polymer nano-catalyst.
It is a further object of the present invention to provide a catalyst for the catalytic oxidation of alcohols.
In order to achieve any one of the above objects, the present invention provides a SiO-based material2Template preparation of TEMPO free radicalsA method of functionalizing hollow conjugated microporous polymers (HCMPs-TEMPO), the method comprising:
palladium catalyst, cuprous iodide and SiO2Adding the nano microspheres into an organic solvent, and stirring for 0.5-1.5 h (preferably 1h) in a nitrogen-protected room-temperature environment (350-450 rpm) to obtain a mixed solution;
adding an aromatic acetylene monomer and a TEMPO free radical functional monomer into the mixed solution, heating to 90-110 ℃ (preferably 100 ℃), reducing the stirring speed to 90-110 rpm (preferably 100rpm), and reacting for 24-50 h (preferably 48h) to obtain the porous material coated SiO2Functionalized conjugated microporous polymer (SiO)2@ CMPs-TEMPO); wherein the molar ratio of the acetylene monomer to the TEMPO free radical functionalized monomer is 2:1-1:3, and the dosage of the palladium catalyst and the cuprous iodide is 8% -12% of the dosage of the aromatic acetylene monomer respectively; SiO22The dosage of the nano-microsphere is SiO2The dosage of the nano microspheres is 700-7000% of the dosage of the aromatic acetylene monomers, and the concentration of the aromatic acetylene monomers in the organic solvent is 0.008mmol/mL-0.016 mmol/mL;
coating porous material with SiO2Functionalized conjugated microporous polymer material (SiO)2@ CMPs-TEMPO), adding into hydrofluoric acid aqueous solution, stirring vigorously for 2-4 h (preferably 3h), cleaning, and centrifuging to obtain TEMPO free radical functionalized hollow conjugated microporous polymer (HCMPs-TEMPO).
The invention is based on SiO2A method for preparing a TEMPO free radical functionalized hollow conjugated microporous polymer by using a template is characterized in that silicon dioxide microspheres are used as the template, and TEMPO free radical functionalized hollow conjugated microporous polymer microspheres with different sizes and different thicknesses of hollow spheres are obtained through polymerization reaction and silica at different times. The polymer microsphere can be used for catalyzing alcohol oxidation reaction, the conversion rate can reach 100%, and the selectivity of the polymer microsphere on the generation of aldehyde by the catalytic oxidation of alcohol can reach more than 99%.
In the invention based on SiO2The method for preparing the TEMPO free radical functionalized hollow conjugated microporous polymer by the template comprises the step of preparing a mixed solution.
Wherein, SiO2The size of the microspheres is uniformUniform and regular shape, and the particle diameter is 100nm-500 nm.
In one embodiment of the invention, the palladium catalyst used is selected from the group consisting of tetrakistriphenylphosphine palladium (Pd (pph)3)4) Bis (triphenylphosphine) palladium dichloride (Pd (pph)3)2Cl2) [1, 1-bis (diphenylphosphino) ferrocene]Palladium dichloride (Pd (dppf)2Cl2) One kind of (1).
In one embodiment of the present invention, the organic solvent is selected from two or three of triethylamine, toluene and methanol. In a further specific embodiment, a mixed solution of triethylamine and toluene in a volume ratio of 1:1 to 1:15 is used as the organic solvent.
In the invention based on SiO2In the method for preparing the TEMPO free radical functionalized hollow conjugated microporous polymer by the template, the method comprises the steps of preparing a porous material coated SiO2The step of functionalizing the conjugated microporous polymer material. After the reaction is finished, cleaning the product by using a solvent and centrifugally collecting the porous material to coat SiO2The functionalized conjugated microporous polymer material of (1). Wherein the molar ratio of the acetylene monomer to the functional monomer is 1:1, 1:2 or 3: 2.
In one embodiment of the present invention, the aromatic acetylene monomer is selected from one of 1, 4-diacetylene benzene, 1,3, 5-tri-acetylene benzene, tetra (4-ethynylbenzene) methane, tetra (4-ethynylbenzene) ethylene, 1,3, 5-tri (4-ethynylphenyl) benzene, and 1,3,6, 8-tetra-acetylenic pyrene. Wherein the structure of the acetylene monomer is shown in table 1.
TABLE 1
In one embodiment of the invention, the TEMPO-functionalised monomer employed is selected from the group consisting of 2, 5-dibromo-N- (2,2,6, 6-tetramethylpiperidine) benzamide (2, 5-dibromo-TEMPO), 2, 5-dibromo-N, N' -bis (2,2,6, 6-tetramethylpiperidine) p-diphenyleneCarboxamide (2, 5-dibromo-TEMPO)2) One kind of (1). The structural formula of the TEMPO free radical functionalized monomer is shown in Table 2.
TABLE 2
In the invention based on SiO2The method for preparing the TEMPO free radical functionalized hollow conjugated microporous polymer by the template comprises the step of preparing the TEMPO free radical functionalized hollow conjugated microporous polymer material.
In one embodiment of the present invention, the hydrofluoric acid aqueous solution is used at a concentration of 10% by mass.
The invention also provides a TEMPO free radical functionalized hollow conjugated microporous polymer, which is prepared by the method2The preparation method of the TEMPO free radical functionalized hollow conjugated microporous polymer by the template. The TEMPO free radical functionalized hollow conjugated microporous polymer has the particle size of 100-500 nm, the thickness of 10-100 nm and the specific surface area of 50m2/g-1000m2/g。
The TEMPO free radical functionalized hollow conjugated microporous polymer can be used for catalytic oxidation of alcohol organic matters. When the TEMPO free radical functionalized hollow conjugated microporous polymer is used for catalyzing and oxidizing alcohol organic matters, a catalyst and a substrate are added into an organic solvent, and the reaction is carried out for 6 hours at 80 ℃.
In one embodiment of the invention, the addition ratio of the catalyst, the substrate and the organic solvent is 10-50 mg: 0.1mmol-0.5 mmol: 10mL-30 mL.
The invention is based on SiO2The functionalized hollow conjugated microporous polymer with a hollow structure can be synthesized by the preparation method of the functionalized hollow conjugated microporous polymer with the nano microspheres as the template. Wherein SiO is used as a template2The preparation of the nano-microsphere is simple, convenient and feasible, and SiO2The nano-microsphere is clean and environment-friendly, and is SiO2The nano-microsphere only needs to be placed in hydrofluoric acid aqueous solutionThe functionalized conjugated microporous polymer can be removed under simple stirring operation at room temperature, and the functionalized conjugated microporous polymer is kept stable in hydrofluoric acid aqueous solution, so that the hollow functionalized conjugated microporous polymer can be obtained. Compared with the solid conjugated microporous polymer, the hollow functionalized conjugated microporous polymer can ensure that a substrate can enter the interior of the porous material through the gaps of the porous material in the catalytic reaction, so that the substrate and the functionalized oxygen free radicals on the porous material can have larger contact area, and the catalytic efficiency of the functionalized conjugated microporous polymer in alcohol catalytic oxidation is further improved. And as the functionalized nitroxide free radical TMEPO heterogeneous loaded catalyst, the catalyst can be recovered by centrifugal separation after the catalysis is finished, and can be recycled.
Drawings
FIG. 1 is a schematic diagram of the synthetic route of the hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 1.
FIG. 2 is a SiO coating of the porous material of example 12Functionalized conjugated microporous polymers (SiO) for templates2@ CMP-4-TEMPO) TEM image.
FIG. 3 is a TEM image of a hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 1.
FIG. 4 is an SEM image of a hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 1.
FIG. 5 is a solid state electron resonance spectrum of hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 1.
FIG. 6 is a BET plot of the hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 1.
FIG. 7 is a schematic representation of the hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 2.
FIG. 8 is a schematic representation of the hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 8.
FIG. 9 is a schematic representation of hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO) of example 12.
Detailed Description
The invention is based on the use of SiO2Preparation method of functionalized hollow conjugated microporous polymer with nano microspheres as templateThe method comprises the following steps:
(a) the palladium catalyst is mixed with cuprous iodide (CuI) and SiO2Adding the nano-microspheres into an organic solvent, and violently stirring for 1h in a nitrogen-protected room-temperature environment to ensure that SiO is dissolved in the organic solvent2Fully dispersing the nano microspheres in a solvent;
(b) adding an acetylene monomer and a functional monomer into the reaction system in the step (a), raising the reaction temperature from room temperature to 100 ℃, reducing the stirring speed to 100rpm, and reacting for 48 hours. After the reaction is finished, sequentially using chloroform, methanol and acetone to clean the product, and centrifugally collecting the product;
(c) SiO coats the porous material obtained in the step (b)2Drying the functionalized conjugated microporous polymer material (SiO2@ CMP-4-TEMPO) of the template, adding the dried material into a 10% hydrofluoric acid aqueous solution, and stirring vigorously for 3 hours. And after being respectively washed by water and ethanol, the obtained hollow functionalized conjugated microporous polymer material (H-CMP-4-TEMPO) is collected by centrifugation.
The invention is based on the use of SiO2The preparation method of the functionalized hollow conjugated microporous polymer with the nano-microsphere as the template utilizes SiO2The nano-microsphere is used as a template, and the catalytic condition is adjusted to induce the organic monomer to generate Sonogashira coupling reaction on the surface of the template to obtain the porous material coated SiO with the core-shell structure2A functionalized conjugated microporous polymer material of a template. And etching SiO with hydrofluoric acid in a simple operation2And (4) nano microspheres to obtain the hollow functionalized conjugated microporous polymer material.
The hollow functionalized conjugated microporous polymer material (H-CMP-4-TEMPO) prepared by the method can be used for catalytic oxidation reaction of alcohol, and specifically comprises the following steps: the H-CMP-4-TEMPO nano catalyst is placed in an organic solvent, fully dispersed, an alcohol organic substrate is added into the organic solvent, tert-butyl nitrite (TBN) is used as a cocatalyst, oxygen is filled into a reaction system, and the reaction is carried out at the temperature of 80 ℃.
Example 1
This example provides a method for preparing an H-CMP-4-TEMPO nanocatalyst, the process of which is shown in fig. 1, and includes the following steps:
(a) mixing SiO2Nanometer micro-meterBalls (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) Adding tetra (4-ethynyl phenylmethane 0.12mmol, 50mg) and 2, 5-dibromo-TEMPO (0.24mmol, 103.4mg) into the reaction system of the step (a), introducing nitrogen for protection, raising the reaction temperature from room temperature to 100 ℃, and reducing the stirring speed to 100rpm for reaction for 48 h.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature to obtain the porous material coated SiO2Functionalized conjugated microporous polymers (SiO) for templates2@ CMP-4-TEMPO), the TEM of which is shown in FIG. 2.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3H, carrying out centrifugal separation, then respectively cleaning with water and ethanol for multiple times, and freeze-drying the product under vacuum to obtain the hollow functionalized conjugated microporous polymer (H-CMP-4-TEMPO), wherein a TEM (transmission electron microscope) is shown in a figure 3, an SEM (scanning electron microscope) is shown in a figure 4, and the prepared H-CMP-4-TEMPO nano catalyst is obvious in hollow structure and uniform in size. The characteristic peak of nitroxide radical at 3320-3420G magnetic field can be observed in the solid-state paramagnetic electron resonance spectrum (FIG. 5), indicating that a large amount of nitroxide radical exists in the H-CMP-4-TEMPO microporous structure.
FIG. 6 shows N of H-CMP-4-TEMPO of the present example2Adsorption/desorption curve with BET specific surface area of 252m2/g。
Taking H-CMP-4-TMEPO (10mg) nano catalyst into a polytetrafluoroethylene reaction kettle, adding trifluorotoluene (0.8mL) into the reaction kettle to serve as a reaction solvent, and fully dispersing the catalyst into the solvent by ultrasonic. And adding a cocatalyst of tert-butyl nitrite (TBN) (8.4 mu L), performing ultrasonic dispersion, adding 5-hydroxymethylfurfural (5-HMF) (0.28 mu L) serving as a catalytic reaction substrate, and finally performing ultrasonic dispersion, and placing the reaction in an oven at 80 ℃ for reaction for several hours. After the reaction is finished, cooling the reaction kettle to room temperature, taking the reaction liquid for high-speed centrifugation (10000rpm, 5min), taking supernate, and analyzing the components in the reaction liquid by a gas-mass spectrometer to obtain the conversion rate and selectivity of converting 5-HMF into 2, 5-furandicarboxaldehyde (2, 5-DFF). The results are shown in Table 3.
TABLE 3 Performance Table for catalyzing alcohol Oxidation of H-CMP-4-TEMPO samples prepared in Experimental example 1
| Reaction time/h | |
| 1 | 50％ |
| 2 | 59.49％ |
| 3 | 65.7％ |
| 4 | 83.6％ |
| 5 | 88％ |
| 6 | 100％ |
Example 2
This example provides a method for preparing H-CMP-2-TEMPO nanocatalyst, which includes the following steps:
(a) mixing SiO2Nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) Was charged with CuI (2.3mg) into a round-bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) Adding 1, 4-diethynylbenzene (0.24mmol, 30mg) and 2, 5-dibromo-TEMPO (0.24mmol, 103.4mg) into the reaction system in the step (a), introducing nitrogen for protection, raising the reaction temperature from room temperature to 100 ℃, and reducing the stirring speed to 100rpm for 48 h.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3H, carrying out centrifugal separation, then respectively cleaning with water and ethanol for multiple times, and freeze-drying the product under vacuum to obtain the H-CMP-2-TEMPO nano catalyst, as shown in figure 7.
Example 3
This example provides a method for preparing H-CMP-3-TEMPO nanocatalyst, which includes the following steps:
(a) mixing SiO2Nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) 1,3, 5-Triethynylbenzene (0.12mmol, 18mg) and 2, 5-dibromo-TEMPO (0.18mmol, 78mg) were added to the reaction system of step (a), the reaction temperature was raised from room temperature to 100 ℃ under a nitrogen blanket, and the stirring speed was decreased to 100 rpm. And reacting for 48 hours.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3 hours, and respectively cleaning with water and ethanol for multiple times after centrifugal separation. And (3) freeze-drying the product under vacuum to obtain the H-CMP-3-TEMPO nano catalyst.
Example 4
This example provides a method for preparing H-CMP-ene-TEMPO nanocatalysts, which includes the following steps:
(a) mixing SiO2Nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) Adding tetra (4-ethynylstyrene) ethylene (0.12mmol, 51mg) and 2, 5-dibromo-TEMPO (0.24mmol, 103.4mg) into the reaction system in the step (a), introducing nitrogen for protection, raising the reaction temperature from room temperature to 100 ℃, and reducing the stirring speed to 100rpm for 48 h.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3 hours, and respectively cleaning with water and ethanol for multiple times after centrifugal separation. The product was freeze dried under vacuum, H-CMP-ene-TEMPO nano catalyst.
Example 5
This example provides a method for preparing H-CMP-benzene-TEMPO nanocatalyst, which includes the following steps:
(a) mixing SiO2Nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) 1,3, 5-tris (4-ethynylphenyl) benzene (0.12mmol,45mg) and 2, 5-dibromo-TEMPO (0.18mmol, 78mg) were added to the reaction system of step (a), the reaction temperature was raised from room temperature to 100 ℃ under a nitrogen blanket, and the stirring speed was lowered to 100 rpm. And reacting for 48 hours.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3 hours, and respectively cleaning with water and ethanol for multiple times after centrifugal separation. And (3) freeze-drying the product under vacuum to obtain the H-CMP-benzene-TEMPO nano catalyst.
Example 6
The embodiment provides a preparation method of an H-CMP-pyrene-TEMPO nano catalyst, which comprises the following steps:
(a) mixing SiO2Nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) Adding 1,3,6, 8-tetraacetylpyrene (0.12mmol,35.8mg) and 2, 5-dibromo-TEMPO (0.24mmol, 103.4mg) into the reaction system of the step (a), introducing nitrogen for protection, raising the reaction temperature from room temperature to 100 ℃, and reducing the stirring speed to 100rpm for 48 h.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3 hours, and respectively cleaning with water and ethanol for multiple times after centrifugal separation. And (3) freeze-drying the product under vacuum to obtain the H-CMP-pyrene-TEMPO nano catalyst.
Example 7
This example provides a method for preparing H-CMP-4-TEMPO nano-catalyst, which comprises the following steps:
(a) SiO2 nanospheres (500mg) and catalyst Pd (PPh)3)2Cl2(8.4mg) and CuI (2.3mg) were charged to a round bottom flask, and triethylamine (15mL) and toluene (15mL) were added under a nitrogen atmosphere. After dispersing the solid by sonication, it was stirred vigorously at room temperature for 1 h.
(b) Adding tetra (4-ethynylbenzene) methane (0.12mmol, 50mg) and 2, 5-dibromo-N, N' -bis (2,2,6, 6-tetramethylpiperidine) p-dibenzoamide (0.24mmol, 151.3mg) into the reaction system of the step (a), introducing nitrogen for protection, raising the reaction temperature to 100 ℃ from room temperature, and reducing the stirring speed to 100rpm for reaction for 48 hours.
(c) Ultrasonically cleaning the product obtained in the step (b) by using chloroform, methanol and acetone respectively, collecting the product by centrifugal separation, and drying the product at low temperature.
(d) And (c) adding the dried product cleaned in the step (c) into 10% hydrofluoric acid aqueous solution, violently stirring for 3 hours, and respectively cleaning with water and ethanol for multiple times after centrifugal separation. And (3) freeze-drying the product under vacuum to obtain the H-CMP-4-TEMPO nano catalyst.
Example 8
This example provides a process for the preparation of a H-CMP-4-TEMPO nanocatalyst, which is essentially the same as that described in example 1, SiO2The template particle size was 500nm, except that: SiO22The amount of nanoparticles used was 300mg, as shown in fig. 8.
Example 9
This example provides a method of preparing an H-CMP-4-TEMPO nanocatalyst, which is substantially identical to the procedure of example 1, except that: the catalyst Pd (PPh)3)2Cl2(8.4mg) was changed to tetrakistriphenylphosphoropadium (Pd (pph)3)4)(14mg)。
Example 10
This example provides a method of preparing an H-CMP-4-TEMPO nanocatalyst, which is substantially identical to the procedure of example 1, except that: the catalyst Pd (PPh)3)2Cl2(8.4mg) to [1, 1-bis (diphenylphosphino) ferrocene]Palladium dichloride (Pd (dppf)2Cl2)(8.8mg)。
Example 11
This example provides a method of preparing an H-CMP-4-TEMPO nanocatalyst, which is substantially identical to the procedure of example 1, except that: the amount of triethylamine solvent was changed to 10 mL.
Example 12
This example provides a method of preparing an H-CMP-4-TEMPO nanocatalyst, which is substantially identical to the procedure of example 1, except that: the amount of triethylamine solvent was changed to 5 mL. As shown in fig. 9.
Comparative example 1
Comparative example 1 is essentially identical to the procedure in example 1, except that: the palladium catalyst used was palladium chloride.
Comparative example 2
Comparative example 2 is essentially identical to the procedure in example 1, except that: the solvent used was hexanol.
Comparative example 3
Comparative example 3 is essentially identical to the procedure in example 1, except that: the aromatic acetylene monomer used is triphenyl (phenylethynyl).
Comparative example 4
Comparative example 4 is essentially identical to the procedure in example 1, except that: the adopted functional monomer is N, N' -bis (2,2,6, 6-tetramethyl-4-piperidyl) -1, 3-benzenedicarboxamide.
The above-mentioned materials of example 1, and comparative examples 1 to 4 were subjected to the catalytic test of example 1 for 6 hours, and the conversion and selectivity (selectivity to 2, 5-furandicarboxaldehyde) of each material were measured. The results are shown in Table 4.
TABLE 4
As can be seen from the above examples and comparative examples, the nano-catalyst prepared by the method of the present invention can effectively catalyze and oxidize alcohols.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. Based on SiO2A method for preparing a TEMPO free radical functionalized hollow conjugated microporous polymer as a template, the method comprising:
palladium catalyst, cuprous iodide and SiO2Adding the nano microspheres into an organic solvent, and stirring for 0.5-1.5 h under the protection of nitrogen to obtain a mixed solution;
adding an aromatic acetylene monomer and a TEMPO free radical functional monomer into the mixed solution, heating to 90-110 ℃, and reacting for 24-50 h to obtain porous material coated SiO2The functionalized conjugated microporous polymer of (a); wherein the molar ratio of the acetylene monomer to the TEMPO free radical functionalized monomer is 2:1-1:3, and the using amounts of the palladium catalyst and the cuprous iodide are respectively 8% -12% of the using amount of the aromatic acetylene monomer; SiO22The dosage of the nano microspheres is 700-7000% of the dosage of the aromatic acetylene monomers, and the concentration of the aromatic acetylene monomers in the organic solvent is 0.008mmol/mL-0.016 mmol/mL;
coating the porous material with SiO2After being dried, the functionalized hollow conjugated microporous polymer is added into hydrofluoric acid aqueous solution to be stirred vigorously for 2h-4h, and then is cleaned and centrifuged to obtain the TEMPO free radical functionalized hollow conjugated microporous polymer.
2. The method of claim 1 wherein the TEMPO radical functional monomer is selected from the group consisting of 2, 5-dibromo-N- (2,2,6, 6-tetramethylpiperidine) benzamide, 2, 5-dibromo-N, N' -bis (2,2,6, 6-tetramethylpiperidine) p-dibenzoamide.
3. The method according to claim 1, wherein the aromatic acetylenic monomer is selected from one of 1, 4-diacetylene benzene, 1,3, 5-triacetylene benzene, tetrakis (4-ethynylbenzene) methane, tetrakis (4-ethynylbenzene) ethylene, 1,3, 5-tris (4-ethynylphenyl) benzene, 1,3,6, 8-tetraacetylene pyrene.
4. The method according to claim 1, wherein the organic solvent is selected from two or three of triethylamine, toluene, methanol;
preferably, the organic solvent is a mixed solution of triethylamine and toluene in a volume ratio of 1:1-1: 15.
5. The process of claim 1, wherein the palladium catalyst is selected from one of tetrakistriphenylphosphine palladium, bis (triphenylphosphine) palladium dichloride, [1, 1-bis (diphenylphosphino) ferrocene ] palladium dichloride.
6. A TEMPO radical functionalized hollow conjugated microporous polymer prepared by the SiO-based hollow conjugated microporous polymer of any one of claims 1 to 52The preparation method of the TEMPO free radical functionalized hollow conjugated microporous polymer by the template.
7. The TEMPO radical functionalized hollow conjugated microporous polymer of claim 6, wherein the TEMPO radical functionalized hollow conjugated microporous polymer has a particle size of 100nm to 500nm, a thickness of 10nm to 100nm, and a specific surface area of 50m2/g-1000m2/g。
8. Use of the TEMPO radical functionalized hollow conjugated microporous polymer according to claim 6 for the catalytic oxidation of alcoholic organics.
9. The use of claim 8, wherein when the TEMPO free radical functionalized hollow conjugated microporous polymer is used for catalyzing and oxidizing alcohol organic matters, the catalyst and the substrate are added into an organic solvent and reacted for 6 hours at 80 ℃.
10. The use according to claim 9, wherein the organic solvent is one or more of toluene, trifluorotoluene, acetonitrile, and 1, 4-dichloroethane.
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| CN112920382A (en) * | 2021-01-29 | 2021-06-08 | 齐齐哈尔大学 | In-situ method for preparing conjugated microporous polymer TiO2Method for compounding nano antibacterial agent |
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| CN113321787A (en) * | 2021-06-02 | 2021-08-31 | 贵州师范大学 | Nitroxide free radical functionalized porous organic polymer nanotube and preparation method and application thereof |
| CN113413917A (en) * | 2021-06-02 | 2021-09-21 | 贵州师范大学 | Preparation and application of Tb-MOF nanosheet based on pyrenetetracarboxylic acid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112920382A (en) * | 2021-01-29 | 2021-06-08 | 齐齐哈尔大学 | In-situ method for preparing conjugated microporous polymer TiO2Method for compounding nano antibacterial agent |
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| CN113321787A (en) * | 2021-06-02 | 2021-08-31 | 贵州师范大学 | Nitroxide free radical functionalized porous organic polymer nanotube and preparation method and application thereof |
| CN113413917A (en) * | 2021-06-02 | 2021-09-21 | 贵州师范大学 | Preparation and application of Tb-MOF nanosheet based on pyrenetetracarboxylic acid |
| CN113321787B (en) * | 2021-06-02 | 2022-06-17 | 贵州师范大学 | Nitroxide free radical functionalized porous organic polymer nanotube and preparation method and application thereof |
| CN115521441A (en) * | 2022-09-13 | 2022-12-27 | 东华理工大学 | Conjugated microporous polymer and preparation method and application thereof |
| CN115521441B (en) * | 2022-09-13 | 2024-05-31 | 东华理工大学 | Conjugated microporous polymer and preparation method and application thereof |
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