CN109046349B - Monoatomic palladium catalyst, preparation method thereof and method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF - Google Patents
Monoatomic palladium catalyst, preparation method thereof and method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF Download PDFInfo
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- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims abstract description 176
- 239000003054 catalyst Substances 0.000 title claims abstract description 112
- 229910052763 palladium Inorganic materials 0.000 title claims abstract description 83
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 title claims abstract description 80
- CHTHALBTIRVDBM-UHFFFAOYSA-N dehydromucic acid Natural products OC(=O)C1=CC=C(C(O)=O)O1 CHTHALBTIRVDBM-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 50
- 230000003647 oxidation Effects 0.000 title claims abstract description 44
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims description 47
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 35
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 34
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 18
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 17
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 17
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 17
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 17
- 229940099596 manganese sulfate Drugs 0.000 claims description 17
- 239000011702 manganese sulphate Substances 0.000 claims description 17
- 235000007079 manganese sulphate Nutrition 0.000 claims description 17
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 17
- GPNDARIEYHPYAY-UHFFFAOYSA-N palladium(ii) nitrate Chemical compound [Pd+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O GPNDARIEYHPYAY-UHFFFAOYSA-N 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 14
- 239000002244 precipitate Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 8
- 230000035484 reaction time Effects 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 description 13
- 239000008367 deionised water Substances 0.000 description 10
- 229910021641 deionized water Inorganic materials 0.000 description 10
- 239000000843 powder Substances 0.000 description 10
- 239000002585 base Substances 0.000 description 6
- 239000000706 filtrate Substances 0.000 description 6
- 238000003912 environmental pollution Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- -1 5-HMF) Chemical compound 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- WMWLMWRWZQELOS-UHFFFAOYSA-N bismuth(III) oxide Inorganic materials O=[Bi]O[Bi]=O WMWLMWRWZQELOS-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- PXJJKVNIMAZHCB-UHFFFAOYSA-N 2,5-diformylfuran Chemical compound O=CC1=CC=C(C=O)O1 PXJJKVNIMAZHCB-UHFFFAOYSA-N 0.000 description 1
- UBTOVQLIWMTLCD-UHFFFAOYSA-N C(=O)C1(OC=CC1)C(=O)O Chemical compound C(=O)C1(OC=CC1)C(=O)O UBTOVQLIWMTLCD-UHFFFAOYSA-N 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
- 239000005715 Fructose Substances 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
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 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
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- 229920006351 engineering plastic Polymers 0.000 description 1
- 150000002240 furans Chemical class 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 238000006053 organic 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
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/56—Platinum group metals
- B01J23/64—Platinum group metals with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/656—Manganese, technetium or rhenium
- B01J23/6562—Manganese
-
- 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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Abstract
The invention relates to a monoatomic palladium catalyst, a preparation method thereof and a method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, belonging to the field of preparation of 2,5-FDCA by selective oxidation of 5-HMF. The structure of the monatomic palladium catalyst is as follows: the active component palladium is highly dispersed and uniformly distributed on the surface of the manganese dioxide in a monoatomic mode; wherein the content of palladium is 0.2-3 wt%, and the content of manganese dioxide is 97-99.8 wt%. The catalyst provided by the invention is simple in preparation method, is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, is simple in use method, and is good in selectivity and reusability during catalytic oxidation.
Description
Technical Field
The invention relates to a monoatomic palladium catalyst, a preparation method thereof and a method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, belonging to the field of preparation of 2,5-FDCA by selective oxidation of 5-HMF.
Background
The energy problem is a worldwide problem, and nowadays, the society has an increasing demand for fossil energy, and many organic materials in life are derived from the fossil energy, and in addition, due to the non-renewable property of the fossil energy such as coal, petroleum and natural gas and environmental problems caused by the heavy use, the search for alternatives of the energy is inevitably a focus of common attention of all countries in the world. The biomass energy source is wide and can be regenerated, and the biomass energy source has good potential value in the aspect of replacing fossil energy, and becomes a hot spot of research in recent years.
5-hydroxymethylfurfural, converted from glucose or fructose, is considered a versatile platform compound that can be used to prepare a range of furan compounds by catalytic oxidation, such as 2, 5-furandicarboxylic acid, 2-formyl-furan-2-carboxylic acid, 2, 5-diformylfuran, and the like.
2, 5-furandicarboxylic acid is used as a high value-added product obtained by selective oxidation of 5-hydroxymethylfurfural, can be used as a raw material to synthesize some polyester materials with excellent performance, and further can be widely used in the fields of packaging material engineering plastics and the like. Many organic materials synthesized by using stone resources such as petroleum and the like as raw materials are difficult to degrade, waste gas and waste residues generated in the synthesis process can cause environmental pollution to a great extent, and the polyester material synthesized by using FDCA (fully drawn yarn) derived from biomass and 2, 5-furandicarboxylic acid as a monomer can be degraded, so that the requirements of sustainable development and environmental protection are met.
In an organic reaction for preparing 2, 5-furandicarboxylic acid (i.e., 2,5-FDCA) by catalytic oxidation of 5-hydroxymethylfurfural (i.e., 5-HMF), often accompanied by the formation of some by-products, catalytic oxidation of 5-hydroxymethylfurfural using a noble metal catalyst is a method effective for increasing the conversion of reactants and the yield of the desired product.
Patent publication No. CN106749130A discloses a method for preparing 2, 5-furandicarboxylic acid by catalytic oxidation of 5-hydroxymethylfurfural with a Pt catalyst. However, the preparation method of the catalyst is complex, the catalyst needs to be prepared under the condition of high temperature of 280 ℃, and ozone is used as a precursor. The oxygen pressure required by the catalyst in the process of preparing 2, 5-furandicarboxylic acid by catalytic oxidation of 5-hydroxymethylfurfural is 0.4Mpa, which is higher than the normal pressure reaction condition of the invention.
Patent publication No. CN104277020A discloses the use of Pd/Bi2O3A process for preparing 2, 5-furandicarboxylic acid by catalytic oxidation of 5-hydroxymethylfurfural and Pd/Bi are disclosed2O3The preparation method of the catalyst is a deposition precipitation method. But the Pd/Bi2O3The using method of the catalyst is complex, the catalyst needs to be reduced for 1-5 hours at 150-250 ℃ in a hydrogen atmosphere before use, the complexity of operation is increased, andthe safety risk is increased due to the need to handle in a high temperature hydrogen atmosphere.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a monoatomic palladium catalyst. When the monatomic palladium catalyst is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, the problem of environmental pollution caused by the need of strong alkali (sodium hydroxide, potassium hydroxide and the like) in the oxidation reaction process of 5-hydroxymethylfurfural catalyzed by the traditional catalyst is solved, and the conversion rate of 5-HMF and the yield of 2,5-FDCA are improved.
A monatomic palladium catalyst, the catalyst structure being: the active component palladium is highly dispersed and uniformly distributed on the surface of the manganese dioxide in a monoatomic mode; wherein the content of palladium is 0.2-3 wt%, and the content of manganese dioxide is 97-99.8 wt%. The monoatomic palladium catalyst prepared by the invention can be Pd/MnO2To indicate.
The second technical problem to be solved by the invention is to provide a preparation method of the monatomic palladium catalyst, which is simple and low in cost, and can ensure that the active component palladium is highly dispersed and uniformly distributed on the surface of manganese dioxide in a monatomic manner without agglomeration.
The preparation method of the monoatomic palladium catalyst comprises the following steps: taking raw materials according to the weight ratio of 5-7: 2-3: 0.05-0.08: 1-2 of ammonium sulfate, ammonium persulfate, palladium nitrate and manganese sulfate, adding water, stirring to obtain a mixture, placing the mixture at 120-160 ℃, reacting for 9-14 h, cooling, filtering, washing to neutrality to obtain black precipitates, drying and crushing the black precipitates to obtain the monatomic palladium catalyst.
Preferably: the weight ratio of ammonium sulfate to ammonium persulfate to palladium nitrate to manganese sulfate is 5.24-6.24: 2.36-2.86: 0.066-0.077: 1.56-1.81; more preferably, the weight ratio of the ammonium sulfate to the ammonium persulfate to the palladium nitrate to the manganese sulfate is 5.24-6.08: 2.36-2.74: 0.066-0.077: 1.56-1.81; further preferably, the weight ratio of ammonium sulfate, ammonium persulfate, palladium nitrate and manganese sulfate is 6.08:2.74:0.077: 1.81.
Preferably: the mixture was left to react at 140 ℃ for 12 h.
Preferably: the drying temperature of the black precipitate is 120 ℃, and the drying time is 12 h.
The third technical problem to be solved by the invention is the application of the monatomic palladium catalyst, and the monatomic palladium catalyst prepared by the invention is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, and the method is simple and easy to operate. The method does not require the addition of strong base (sodium hydroxide, potassium hydroxide, etc.).
The method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF by using the monoatomic palladium catalyst comprises the following steps: and mixing the prepared monoatomic palladium catalyst, anhydrous potassium carbonate and an aqueous solution of 5-HMF, and reacting at 80-110 ℃ in an oxygen atmosphere to obtain the 2, 5-FDCA.
Preferably: the weight ratio of the monoatomic palladium catalyst to the anhydrous potassium carbonate to the 5-HMF is 0.9-1.1: 3-4: 0.7-0.9; preferably, the weight ratio of the monoatomic palladium catalyst to the potassium carbonate to the 5-HMF is 1-1.1: 3.35-3.5: 0.77-0.8; more preferably, the weight ratio of the monatomic palladium catalyst, potassium carbonate, and 5-HMF is 1.1:3.5: 0.8.
Preferably: the oxygen flow rate was 25 ml/min.
Preferably: the reaction temperature is 90-110 ℃; further preferably, the reaction temperature is 110 ℃.
Preferably: the reaction time is at least 3 h; the preferred reaction time is 5 h.
The invention has the beneficial effects that:
1. the monoatomic palladium catalyst Pd/MnO of the invention2The structure is unique, the active component palladium is highly dispersed and uniformly distributed on the surface of manganese dioxide in a monoatomic mode, and the problem of poor catalytic performance caused by the agglomeration of noble metal atoms into atomic groups with different particle sizes is solved.
2. Pd/MnO of the invention2Medium Pd and carrier MnO2The acting force between the catalyst and the carrier is strong, and the defect of poor reusability caused by weak acting force between the traditional supported catalyst and the carrier is overcome. The palladium catalyst is adopted to catalyze and oxidize 5-HMF to prepare 2,5-FDCA, the 5-HMF can be oxidized in a short time, the conversion rate reaches more than 98 percent, the yield of the 2,5-FDCA reaches more than 90 percent, and the catalyst is reusableAnd the 5-HMF oxidation reaction conversion rate is basically kept unchanged, and the yield of the 2,5-FDCA is reduced by only 2 percent after the 5-HMF oxidation reaction is repeatedly used.
3. In the process of catalyzing the oxidation reaction of the 5-hydroxymethylfurfural by adopting the palladium catalyst, strong alkali (sodium hydroxide, potassium hydroxide and the like) is not needed, so that the conversion rate of the 5-hydroxymethylfurfural is high, the yield of the 2, 5-furandicarboxylic acid is high, and the problems of equipment corrosion and environmental pollution caused by the strong alkali needed in the traditional catalyst catalysis are solved.
4. The palladium catalyst of the invention has simple preparation method, does not need any treatment before use, is simple and convenient to use, can be used under normal pressure, and has wide application prospect.
Drawings
FIG. 1 is a graph showing the oxidation conversion of 5-hydroxymethylfurfural and the yield of p-2, 5-furandicarboxylic acid with time in example 1.
FIG. 2 is a graph of the reusability of catalyst A1 in example 1.
FIG. 3 is an electron microscope structural view of the catalyst A1 in example 1.
Detailed Description
The first technical problem to be solved by the invention is to provide a monoatomic palladium catalyst. When the monatomic palladium catalyst is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, the problem of environmental pollution caused by the need of strong alkali (sodium hydroxide, potassium hydroxide and the like) in the oxidation reaction process of 5-hydroxymethylfurfural catalyzed by the traditional catalyst is solved, and the conversion rate of 5-HMF and the yield of 2,5-FDCA are improved.
The conversion and yield of the invention are calculated as follows:
wherein, the 5-HMF is 5-hydroxymethylfurfural; 2,5-FDCA is 2, 5-furandicarboxylic acid.
The monatomic palladium catalyst has the following structure: the active component palladium is highly dispersed and uniformly distributed on the surface of the manganese dioxide in a monoatomic mode; wherein the content of palladium is 0.2-3 wt%, and the content of manganese dioxide is 97-99.8 wt%. The monoatomic palladium catalyst of the invention can be Pd/MnO2To indicate.
The second technical problem to be solved by the invention is to provide a preparation method of the monatomic palladium catalyst, which is simple and low in cost, and can ensure that the active component palladium is highly dispersed and uniformly distributed on the surface of manganese dioxide in a monatomic manner without agglomeration.
The preparation method of the monoatomic palladium catalyst comprises the following steps: taking raw materials according to the weight ratio of 5-7: 2-3: 0.05-0.08: 1-2 of ammonium sulfate, ammonium persulfate, palladium nitrate and manganese sulfate, adding water, magnetically stirring to obtain a mixture, placing the mixture at 120-160 ℃, reacting for 9-14 h, naturally cooling, taking out, filtering, washing filtrate to neutrality to obtain black precipitate, drying and crushing the black precipitate to obtain the monatomic palladium catalyst Pd/MnO2。
In order to improve the performance of the catalyst, it is preferable that: the weight ratio of ammonium sulfate to ammonium persulfate to palladium nitrate to manganese sulfate is 5.24-6.24: 2.36-2.86: 0.066-0.077: 1.56-1.81; more preferably, the weight ratio of the ammonium sulfate to the ammonium persulfate to the palladium nitrate to the manganese sulfate is 5.24-6.08: 2.36-2.74: 0.066-0.077: 1.56-1.81; when the weight ratio of ammonium sulfate to ammonium persulfate to palladium nitrate to manganese sulfate is 6.08:2.74:0.077:1.81, the prepared monatomic palladium catalyst has the best performance, when the monatomic palladium catalyst is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, the conversion rate of 5-HMF is high, the yield of 2,5-FDCA is high, and the reusability of the catalyst is the best.
To improve the performance of the monatomic palladium catalyst, it is preferable that: the mixture was left to react at 140 ℃ for 12 h.
Preferably: the drying temperature of the black precipitate is 120 ℃, and the drying time is 12 h.
The third technical problem to be solved by the invention is the application of the monatomic palladium catalyst, and the monatomic palladium catalyst prepared by the invention is used for preparing 2,5-FDCA by catalytic oxidation of 5-HMF, and the method is simple and easy to operate. The method does not require the addition of strong base (sodium hydroxide, potassium hydroxide, etc.).
The method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF by using the monoatomic palladium catalyst is characterized by comprising the following steps: and mixing the prepared monoatomic palladium catalyst, anhydrous potassium carbonate and an aqueous solution of 5-HMF, and reacting at 80-110 ℃ in an oxygen atmosphere to obtain the 2, 5-FDCA.
In the prior art, strong base (sodium hydroxide, potassium hydroxide and the like) is needed to reduce the loss of active components of the catalyst in the catalytic oxidation reaction process of the 5-HMF, the basic salt potassium carbonate is used for replacing the strong base to provide an alkaline environment for the conversion of the 5-HMF, and the problems of equipment corrosion and environmental pollution caused by the use of the strong base are avoided because the strong base is not used.
To improve the performance of the monatomic palladium catalyst, it is preferable that: the weight ratio of the monoatomic palladium catalyst to the anhydrous potassium carbonate to the 5-HMF is 0.9-1.1: 3-4: 0.7-0.9; more preferably, the weight ratio of the monoatomic palladium catalyst to the potassium carbonate to the 5-HMF is 1-1.1: 3.35-3.5: 0.77-0.8; further preferably, the weight ratio of the monatomic palladium catalyst, potassium carbonate, and 5-HMF is 1.1:3.5: 0.8.
Preferably: the oxygen flow rate was 25 ml/min.
Preferably: the reaction temperature is 90-110 ℃; further preferably, the reaction temperature is 110 ℃.
Preferably: the reaction time is at least 3 h; the preferred reaction time is 5 h.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the scope of the present invention.
Example 1
TABLE 1
Catalytic oxidation time/h | Conversion of 5-HMF/%) | Yield of 2, 5-FDCA/%) |
1 | 38.2 | 17.1 |
2 | 64.0 | 42.5 |
3 | 98.1 | 85.3 |
4 | 100 | 89.2 |
5 | 100 | 94.2 |
The catalyst after 5 hours of reaction was recovered by filtration and reused 4 more times according to the above procedure 2 for 5 hours of reaction each time, and the results are shown in FIG. 2. The conversions of 5-HMF at 4 times were all 100% and the yields of 2,5-FDCA were 93.8%, 93.2%, 93.0%, 92.2%, respectively.
Example 2
Example 3
The catalyst was recovered by filtration and reused 4 more times as described above for 5h each time. The conversions of 5-HMF at 4 times were determined to be 98%, 98.3%, 97.5%, 97.2%, 97.6%, respectively, and the yields of 2,5-FDCA were 90.1%, 89.5%, 89.4%, 88.9%, respectively.
Example 4
Example 5
Claims (15)
1. A monatomic palladium catalyst useful in the catalytic oxidation of 5-HMF to produce 2,5-FDCA, wherein the catalyst structure is: the active component palladium is highly dispersed and uniformly distributed on the surface of the manganese dioxide in a monoatomic mode; wherein the content of palladium is 0.2-3 wt%, and the content of manganese dioxide is 97-99.8 wt%;
the preparation method of the monoatomic palladium catalyst comprises the following steps: taking raw materials according to the weight ratio of 5-7: 2-3: 0.05-0.08: 1-2 of ammonium sulfate, ammonium persulfate, palladium nitrate and manganese sulfate, adding water, stirring to obtain a mixture, placing the mixture at 120-160 ℃, reacting for 9-14 h, cooling, filtering, washing to neutrality to obtain black precipitates, drying and crushing the black precipitates to obtain the monatomic palladium catalyst.
2. The monatomic palladium catalyst for the catalytic oxidation of 5-HMF to 2,5-FDCA according to claim 1, characterized in that: the weight ratio of the ammonium sulfate to the ammonium persulfate to the palladium nitrate to the manganese sulfate is 5.24-6.24: 2.36-2.86: 0.066-0.077: 1.56-1.81.
3. The monatomic palladium catalyst for the catalytic oxidation of 5-HMF to 2,5-FDCA according to claim 2, characterized in that: the weight ratio of the ammonium sulfate to the ammonium persulfate to the palladium nitrate to the manganese sulfate is 5.24-6.08: 2.36-2.74: 0.066-0.077: 1.56-1.81.
4. The monatomic palladium catalyst for the catalytic oxidation of 5-HMF to 2,5-FDCA according to claim 3, characterized in that: the weight ratio of ammonium sulfate, ammonium persulfate, palladium nitrate and manganese sulfate is 6.08:2.74:0.077: 1.81.
5. The monatomic palladium catalyst for the catalytic oxidation of 5-HMF to 2,5-FDCA according to claim 1, characterized in that: the mixture was left to react at 140 ℃ for 12 h.
6. The monatomic palladium catalyst for the catalytic oxidation of 5-HMF to 2,5-FDCA according to claim 1, characterized in that: the drying temperature of the black precipitate is 120 ℃, and the drying time is 12 h.
7. The method for preparing 2,5-FDCA by catalytic oxidation of 5-HMF by using the monoatomic palladium catalyst is characterized by comprising the following steps: mixing the monoatomic palladium catalyst according to any one of claims 1 to 6, anhydrous potassium carbonate and an aqueous solution of 5-HMF, and reacting at 80-110 ℃ in an oxygen atmosphere to obtain 2, 5-FDCA.
8. The method of claim 7 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the weight ratio of the monoatomic palladium catalyst to the anhydrous potassium carbonate to the 5-HMF is 0.9-1.1: 3-4: 0.7-0.9.
9. The method of claim 8 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the weight ratio of the monoatomic palladium catalyst to the potassium carbonate to the 5-HMF is 1-1.1: 3.35-3.5: 0.77-0.8.
10. The method of claim 7 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the weight ratio of the monatomic palladium catalyst, potassium carbonate, and 5-HMF was 1.1:3.5: 0.8.
11. The method of claim 7 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the oxygen flow rate was 25 ml/min.
12. The method of claim 7 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the reaction temperature is 90-110 ℃.
13. The process for the preparation of 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst according to claim 12, wherein: the reaction temperature was 110 ℃.
14. The method of claim 7 for preparing 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst, wherein: the reaction time is at least 3 h.
15. The process for the preparation of 2,5-FDCA by the catalytic oxidation of 5-HMF with a monoatomic palladium catalyst according to claim 14, wherein: the reaction time was 5 h.
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