CN111346659A - Hollow yolk-shell structure cobalt-carbon material and preparation method and application thereof - Google Patents
Hollow yolk-shell structure cobalt-carbon material and preparation method and application thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- CODVACFVSVNQPY-UHFFFAOYSA-N [Co].[C] Chemical compound [Co].[C] CODVACFVSVNQPY-UHFFFAOYSA-N 0.000 title claims description 7
- 239000003575 carbonaceous material Substances 0.000 title claims description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
- 239000003054 catalyst Substances 0.000 claims abstract description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 18
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 10
- 239000010941 cobalt Substances 0.000 claims abstract description 10
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052681 coesite Inorganic materials 0.000 claims abstract description 9
- 229910052906 cristobalite Inorganic materials 0.000 claims abstract description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052682 stishovite Inorganic materials 0.000 claims abstract description 9
- 229910052905 tridymite Inorganic materials 0.000 claims abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000005530 etching Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000001301 oxygen Substances 0.000 claims abstract description 7
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 5
- 238000003837 high-temperature calcination Methods 0.000 claims abstract description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 22
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- LXBGSDVWAMZHDD-UHFFFAOYSA-N 2-methyl-1h-imidazole Chemical compound CC1=NC=CN1 LXBGSDVWAMZHDD-UHFFFAOYSA-N 0.000 claims description 9
- 238000006709 oxidative esterification reaction Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 238000001354 calcination Methods 0.000 claims description 4
- 239000012295 chemical reaction liquid Substances 0.000 claims description 4
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 239000012074 organic phase Substances 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Inorganic materials [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000002390 rotary evaporation Methods 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims 2
- UWQOPFRNDNVUOA-UHFFFAOYSA-N dimethyl furan-2,5-dicarboxylate Chemical compound COC(=O)C1=CC=C(C(=O)OC)O1 UWQOPFRNDNVUOA-UHFFFAOYSA-N 0.000 claims 1
- 238000011068 loading method Methods 0.000 claims 1
- 239000002245 particle Substances 0.000 claims 1
- 229910000510 noble metal Inorganic materials 0.000 abstract description 6
- WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005886 esterification reaction Methods 0.000 abstract description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 abstract description 4
- 229910052737 gold Inorganic materials 0.000 abstract description 3
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 229910052763 palladium Inorganic materials 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 abstract description 2
- 230000001590 oxidative effect Effects 0.000 abstract description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 abstract description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 2
- 230000032050 esterification Effects 0.000 abstract 2
- 239000002086 nanomaterial Substances 0.000 abstract 2
- 125000003172 aldehyde group Chemical group 0.000 abstract 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 abstract 1
- 239000010931 gold Substances 0.000 abstract 1
- 239000012924 metal-organic framework composite Substances 0.000 abstract 1
- 239000011148 porous material Substances 0.000 abstract 1
- 239000002243 precursor Substances 0.000 abstract 1
- 239000011943 nanocatalyst Substances 0.000 description 5
- LARLSBWABHVOTC-UHFFFAOYSA-N 1,1-bis(4-chlorophenyl)-2,2,2-trifluoroethanol Chemical compound C=1C=C(Cl)C=CC=1C(C(F)(F)F)(O)C1=CC=C(Cl)C=C1 LARLSBWABHVOTC-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000004705 High-molecular-weight polyethylene Substances 0.000 description 2
- 238000003917 TEM image Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- LQNUZADURLCDLV-UHFFFAOYSA-N nitrobenzene Chemical compound [O-][N+](=O)C1=CC=CC=C1 LQNUZADURLCDLV-UHFFFAOYSA-N 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000005715 Fructose Substances 0.000 description 1
- 229930091371 Fructose Natural products 0.000 description 1
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
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- 229920002678 cellulose Polymers 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007783 nanoporous material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000013341 scale-up Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
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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
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- B01J35/397—
-
- 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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/086—Decomposition of an organometallic compound, a metal complex or a metal salt of a carboxylic acid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D307/00—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom
- C07D307/02—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings
- C07D307/34—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D307/56—Heterocyclic compounds containing five-membered rings having one oxygen atom as the only ring hetero atom not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D307/68—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
Abstract
The invention discloses a cobalt-based nano material with a hollow yolk-shell structure, and a preparation method and application thereof. The material is prepared from ZIF-67@ SiO2The @ ZIF-8 MOF composite material is used as a precursor and is obtained by high-temperature calcination and etching with a sodium hydroxide solution. The material is used as a catalyst, methanol is used as a solvent, an aldehyde group protection reagent and an esterification reagent, and oxygen at normal pressure is used as an oxidant, so that the conversion of HMF to furan-2, 5-dimethyl dicarboxylate can be realized at 80 ℃. The invention adopts heterogeneous hollow yolk-shell structure cobalt-based nano material with larger specific surface area and pore volume as catalystThe catalyst can be recycled after the reaction is finished; the catalyst is cheap and easy to obtain, and noble metal catalysts such as gold, palladium and the like are not needed; the reaction condition is mild, alkaline additives such as sodium methoxide and potassium carbonate are not needed, and the oxidation esterification of HMF can be realized at low temperature and normal pressure in an oxygen atmosphere; the reaction can be carried out at high concentration, which is beneficial to realizing industrial application.
Description
Technical Field
The invention belongs to the field of preparation of nano porous materials, and particularly relates to a cobalt-based nano catalyst with a hollow yolk-shell structure, a preparation method and application thereof in HMF (high molecular weight polyethylene) oxidative esterification.
Background
HMF is an important chemical generated by dehydration of biomass such as glucose, fructose, cellulose, etc., and it can be used to convert into various commercial chemicals, where FDMC generated by oxidative esterification of HMF is an important unit for the synthesis of PEF plastics and is therefore of great interest to the industry and academia.
The conventional HMF oxidative esterification method mainly includes the following two methods: (1) HMF oxidation esterification reaction catalyzed by noble metals such as Pd, Au and the like (ChemSus chem 2008,1, 75-78; J.Catal.2015,326, 1-8; Greenchem.2018,20, 3050-3058.); (2) the catalyst is used for HMF oxidation esterification reaction (ChemSusChem 2014,7, 3334-3340; ChemCisChem 2016,8, 2907-2911; Catal. Commun.2017,90,91-94.) which is catalyzed by non-noble metals such as Co, Cu and the like.
However, the above methods have some disadvantages, for example, the use of noble metal catalysts such as Pd, Au, etc. increases the reaction cost, which is not favorable for industrial application; the use of sodium methoxide, potassium carbonate and other alkalis can cause water pollution, which is not favorable for environmental protection; additives such as K-OMS-2 and the like are additionally added in the reaction; the temperature and pressure required by the reaction are high, side reactions can be caused, and potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a cobalt-based nano catalyst with a hollow yolk-shell structure, which has the advantages of simple experimental method, easy realization of experimental conditions and high selectivity and yield of obtained products, a preparation method and application thereof in HMF (high molecular weight polyethylene) oxidative esterification.
The technical solution for realizing the purpose of the invention is as follows:
the invention relates to a hollow yolk-shell structure catalyst (Co @ CN) and a preparation method thereof, which comprises the following steps:
step 1, sequentially adding ZIF-67@ SiO into methanol2，Zn(NO3)2·6H2Stirring O and 2-methylimidazole at room temperature for reaction, washing with ethanol, centrifuging and drying to obtain ZIF-67@ SiO2@ZIF-8；
Step 2, ZIF-67@ SiO2@ ZIF-8 is calcined in a tube furnace at high temperature;
and 3, etching the obtained calcined product by using a sodium hydroxide solution, centrifuging, cleaning by using ethanol, and drying in vacuum to obtain the Co @ CN material.
Further, in step 1, ZIF-67@ SiO2With Zn (NO)3)2·6H2The mass ratio of O to 2-methylimidazole is 0.4:5.95: 6.16.
Further, in the step 2, the high-temperature calcination temperature is 900 +/-10 ℃, the heating rate is 5 ℃/min, and the calcination time is 3-4 h.
Further, in step 3, the concentration of the sodium hydroxide solution is 0.5M, and the etching time is 48 hours.
Further, in step 3, vacuum drying is carried out for 12 hours at 80 ℃.
The method takes Co @ CN material as a catalyst, and under the condition of no addition of alkali and noble metal, HMF (5-hydroxymethylfurfural) is catalyzed to be oxidized and esterified to prepare FDMC (furan-2, 5-dimethyl diformate) under the low temperature and normal pressure of oxygen.
Further, the specific application conditions are as follows:
adding 0.2mmol of HMF, 20mg of Co @ CN and 1mL of methanol into a reaction container, reacting for 12 hours at 80 ℃ under the condition of normal pressure and oxygen, cooling after the reaction is finished, separating a catalyst and a reaction liquid, removing a solvent from an organic phase through rotary evaporation, and recrystallizing to obtain a reaction product FDMC.
Compared with the prior art, the invention has the following remarkable advantages:
(1) the reaction conditions are simple and no noble metal catalyst is used.
(2) The reaction condition is mild, alkali and strong oxidant are not needed, and the reaction can be carried out at low temperature and normal pressure, which is beneficial to environmental protection.
(3) The reaction can be carried out at a high concentration (2M), with the possibility of scale-up of production.
(4) High yield of reaction, good selectivity and easy separation of products.
(5) The catalyst can be recycled after the reaction.
Drawings
Fig. 1 is an SEM image of a hollow yolk-shell structure cobalt-based nanocatalyst prepared in example 1 of the present invention.
Fig. 2 is a TEM image of a hollow yolk-shell structure cobalt-based nanocatalyst prepared in example 1 of the present invention.
Detailed Description
Example 1: preparation of catalyst Co @ CN
To 70mL of water were added 2-methylimidazole (5.4g), TEOS (0.75mL) and Co (NO) respectively3)2·6H2O (0.35g), stirring and reacting for 3h at room temperature, washing with ethanol after the reaction is finished, and centrifugally drying to obtain ZIF-67@ SiO2. Then adding ZIF-67@ SiO into 300mL of methanol respectively2(400mg)，Zn(NO3)2·6H2O (5.95g) and 2-methylimidazole (6.16g) are stirred at room temperature for 24 hours to react, washed by ethanol and centrifugally dried to obtain ZIF-67@ SiO2@ ZIF-8. The resulting ZIF-67@ SiO2@ ZIF-8 was calcined in a tube furnace at a rate of 5 ℃/min 900 ℃ for 3h, followed by etching with 0.5M sodium hydroxide for 48h, centrifuged and washed with ethanol three times after the etching was completed, and the resulting catalyst was placed in a vacuum oven and dried at 80 ℃ for 12 h. The cobalt-based nano catalyst with a hollow yolk-shell structure is obtained, wherein the cobalt content is 2.2 wt.%. The SEM image and TEM image are shown in FIG. 1 and FIG. 2, respectively.
Comparative example 1: preparation of catalyst Co/CN
To 70mL of water were added 2-methylimidazole (5.4g) and Co (NO) respectively3)2·6H2O (0.35g), stirred at room temperature for reaction for 3h, washed with ethanol after the reaction is finished, and centrifugally dried to obtain ZIF-67. And calcining the obtained ZIF-67 in a tubular furnace at the temperature rise rate of 5 ℃/min and 900 ℃ for 3h to obtain Co/CN.
Comparative example 2: preparation of catalyst Co-CN
To 70mL of water were added 2-methylimidazole (5.4g), and Co (NO) respectively3)2·6H2O (0.35g), stirred at room temperature for reaction for 3h, washed with ethanol after the reaction is finished, and centrifugally dried to obtain ZIF-67. Thereafter, ZIF-67(280mg) and Zn (NO) were added to 300mL of methanol, respectively3)2·6H2O (5.95g) and 2-methylimidazole (6.16g) were stirred at room temperature for 24 hours, washed with ethanol and dried by centrifugation to give ZIF-67@ ZIF-8. Calcining the obtained ZIF-67@ ZIF-8 in a tube furnace at a heating rate of 5 ℃/min at 900 DEG CAnd 3h, obtaining Co-CN.
Comparative example 3: preparation of catalyst Co/AC
AC (500mg) was dispersed in 25mL of water, followed by the addition of Co (NO)3)2·6H2O (55mg), stirred at room temperature for 6h, then NaBH was added4(0.93mmol), stirring was continued for 6h, centrifuged and washed three times with ethanol and the catalyst was placed in a vacuum oven and dried at 80 ℃ for 12 h.
Example 2: oxidative esterification of HMF
0.2mmol of HMF, 20mg of Co @ CN and 1mL of methanol are added into a reaction vessel and reacted for 12 hours at 80 ℃ under the condition of normal pressure and oxygen. After the reaction is finished and the temperature is reduced, the catalyst and the reaction liquid are separated, the organic phase is evaporated by rotation to remove the solvent, and the reaction product is obtained by recrystallization. As shown by the results in the table, the selectivity and yield of FDMC are superior to other catalysts under the catalysis of the catalyst Co @ CN.
Example 3: oxidative esterification of high concentration HMF (2M)
2mmol of HMF, 200mg of Co @ CN and 1mL of methanol are added into a reaction vessel and reacted for 24 hours at 80 ℃ under the condition of normal pressure and oxygen. After the reaction is finished and the temperature is reduced, the catalyst and the reaction liquid are separated, the organic phase is evaporated by rotation to remove the solvent, and the reaction product is obtained by recrystallization.
Table one:
areaction conditions 1a (0.2mmol), catalyst (3.8 mol% of Co), MeOH (1mL),0.1MPa O2,80℃,12h.bThe yield was determined by GC using nitrobenzene as an internal standard.c1a (2mmol), catalyst (3.8 mol% of Co), MeOH (1mL),0.1MPa O2,80℃,24h.dIsolated yield.
Claims (9)
1. The preparation method of the hollow yolk-shell structure cobalt-carbon material is characterized by comprising the following specific steps of:
step 1, sequentially adding ZIF-67@ SiO into methanol2，Zn(NO3)2·6H2Stirring O and 2-methylimidazole at room temperature for reaction, washing with ethanol, centrifuging and drying to obtain ZIF-67@ SiO2@ZIF-8；
Step 2, ZIF-67@ SiO2@ ZIF-8 is calcined in a tube furnace at high temperature;
and 3, etching the obtained calcined product by using a sodium hydroxide solution, centrifuging, cleaning by using ethanol, and drying in vacuum to obtain the material.
2. The method of claim 1, wherein in step 1, ZIF-67@ SiO is applied2With Zn (NO)3)2·6H2The mass ratio of O to 2-methylimidazole is 0.4:5.95: 6.16.
3. The preparation method according to claim 1, wherein in the step 2, the high-temperature calcination temperature is 900 ± 10 ℃, the temperature rise rate is 5 ℃/min, and the calcination time is 3-4 h.
4. The method according to claim 1, wherein in step 3, the concentration of the sodium hydroxide solution is 0.5M, and the etching time is 48 hours.
5. The method of claim 1, wherein in step 3, 80 ° foAnd C, vacuum drying for 12 h.
6. A hollow yolk-shell structured cobalt carbon material prepared by the method of any one of claims 1 to 5.
7. The hollow yolk-shell structured cobalt carbon material of claim 6, wherein the material has a hollow yolk-shell structure and the active component is cobalt-based nanoparticles, wherein the loading of Co is 2.2%; the cobalt-based nanoparticles have an average particle size of 34 nm.
8. Use of a hollow yolk-shell structure cobalt carbon material prepared by the method according to any one of claims 1 to 5 for catalyzing the oxidative esterification of 5-hydroxymethylfurfural to furan-2, 5-dicarboxylic acid dimethyl ester.
9. The use according to claim 8, characterized in that the specific method is as follows: adding 0.2mmol of 5-hydroxymethylfurfural, 20mg of hollow yolk-shell structure cobalt carbon material and 1mL of methanol into a reaction vessel, reacting for 12h at 80 ℃ under the condition of normal pressure and oxygen, separating a catalyst and a reaction liquid after the reaction is finished and the temperature is reduced, removing a solvent from an organic phase through rotary evaporation, and recrystallizing to obtain a reaction product of furan-2, 5-dimethyl dicarboxylate.
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| CN108962618A (en) * | 2018-07-17 | 2018-12-07 | 合肥工业大学 | A kind of bivalve layer, the hollow porous carbon of yolk shell N doping and its preparation method and application |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112133933A (en) * | 2020-09-20 | 2020-12-25 | 湖南科技大学 | Preparation method of iron-cobalt-platinum-loaded three-dimensional network surface hollow carbon sphere compound, product and application thereof |
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