CN118045629A - Triazine molecular cage supported palladium catalyst and preparation method and application thereof - Google Patents
Triazine molecular cage supported palladium catalyst and preparation method and application thereof Download PDFInfo
- Publication number
- CN118045629A CN118045629A CN202410059121.7A CN202410059121A CN118045629A CN 118045629 A CN118045629 A CN 118045629A CN 202410059121 A CN202410059121 A CN 202410059121A CN 118045629 A CN118045629 A CN 118045629A
- Authority
- CN
- China
- Prior art keywords
- tmc1
- triazine
- catalyst
- molecular cage
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 title claims abstract description 171
- 239000003054 catalyst Substances 0.000 title claims abstract description 75
- JYEUMXHLPRZUAT-UHFFFAOYSA-N 1,2,3-triazine Chemical compound C1=CN=NN=C1 JYEUMXHLPRZUAT-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000002091 nanocage Substances 0.000 title claims abstract description 63
- 229910052763 palladium Inorganic materials 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 102100033690 Transmembrane channel-like protein 1 Human genes 0.000 claims abstract description 119
- UEXCJVNBTNXOEH-UHFFFAOYSA-N Ethynylbenzene Chemical group C#CC1=CC=CC=C1 UEXCJVNBTNXOEH-UHFFFAOYSA-N 0.000 claims abstract description 76
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000006243 chemical reaction Methods 0.000 claims abstract description 67
- 101000801040 Homo sapiens Transmembrane channel-like protein 1 Proteins 0.000 claims abstract description 64
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 17
- 101100425646 Caenorhabditis elegans tmc-1 gene Proteins 0.000 claims abstract description 4
- 238000011068 loading method Methods 0.000 claims abstract description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 57
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 57
- 239000000243 solution Substances 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 229910000033 sodium borohydride Inorganic materials 0.000 claims description 9
- 239000012279 sodium borohydride Substances 0.000 claims description 9
- 239000007983 Tris buffer Substances 0.000 claims description 8
- 239000011541 reaction mixture Substances 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 7
- 125000002485 formyl group Chemical class [H]C(*)=O 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 238000002390 rotary evaporation Methods 0.000 claims description 6
- 238000000520 microinjection Methods 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 4
- 238000006482 condensation reaction Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- 239000002244 precipitate Substances 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 239000013049 sediment Substances 0.000 claims description 2
- 230000002194 synthesizing effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000000843 powder Substances 0.000 claims 1
- -1 alkyne compounds Chemical class 0.000 abstract description 9
- 229910052751 metal Inorganic materials 0.000 description 16
- 239000002184 metal Substances 0.000 description 16
- 239000000047 product Substances 0.000 description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 239000000758 substrate Substances 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 238000009792 diffusion process Methods 0.000 description 6
- 150000001336 alkenes Chemical class 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000003197 catalytic effect Effects 0.000 description 5
- 150000001345 alkine derivatives Chemical class 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 239000000376 reactant Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000006555 catalytic reaction Methods 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- SNRUBQQJIBEYMU-UHFFFAOYSA-N dodecane Chemical compound CCCCCCCCCCCC SNRUBQQJIBEYMU-UHFFFAOYSA-N 0.000 description 3
- 238000004817 gas chromatography Methods 0.000 description 3
- 229910052736 halogen Inorganic materials 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 229940094933 n-dodecane Drugs 0.000 description 3
- 230000006911 nucleation Effects 0.000 description 3
- 238000010899 nucleation Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 238000010926 purge Methods 0.000 description 3
- 238000004544 sputter deposition Methods 0.000 description 3
- DLGYNVMUCSTYDQ-UHFFFAOYSA-N azane;pyridine Chemical compound N.C1=CC=NC=C1 DLGYNVMUCSTYDQ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002296 dynamic light scattering Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 125000002534 ethynyl group Chemical class [H]C#C* 0.000 description 2
- 125000005843 halogen group Chemical group 0.000 description 2
- 239000002638 heterogeneous catalyst Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000696 nitrogen adsorption--desorption isotherm Methods 0.000 description 2
- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- GHUURDQYRGVEHX-UHFFFAOYSA-N prop-1-ynylbenzene Chemical compound CC#CC1=CC=CC=C1 GHUURDQYRGVEHX-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 239000012696 Pd precursors Substances 0.000 description 1
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- JRXXLCKWQFKACW-UHFFFAOYSA-N biphenylacetylene Chemical group C1=CC=CC=C1C#CC1=CC=CC=C1 JRXXLCKWQFKACW-UHFFFAOYSA-N 0.000 description 1
- 238000006664 bond formation reaction Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013310 covalent-organic framework Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000009904 heterogeneous catalytic hydrogenation reaction Methods 0.000 description 1
- 239000012456 homogeneous solution Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 150000002466 imines Chemical class 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000001819 mass spectrum Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000012621 metal-organic framework Substances 0.000 description 1
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 238000000527 sonication Methods 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002411 thermogravimetry Methods 0.000 description 1
- 238000001757 thermogravimetry curve Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Landscapes
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention discloses a triazine molecular cage supported palladium catalyst and a preparation method and application thereof. The triazine molecular cage supported palladium catalyst comprises a carrier and an active component, wherein the carrier comprises a triazine molecular cage TMC1, the active component is a palladium nanocluster, and the palladium nanocluster is encapsulated in an internal cavity of the triazine molecular cage TMC 1; the Pd@TMC1 catalyst is in a non-smooth sphere shape, the particle size of the Pd@TMC1 catalyst is 50-200 nm, and the particle size of the Pd nanocluster encapsulated in the internal cavity of the triazine molecular cage TMC1 is 0.8-2.8 nm; the palladium loading is 0.3 to 3wt% based on the total mass of the catalyst. The Pd@TMC1 catalyst prepared by the method can be applied to catalyzing phenylacetylene hydrogenation reaction to prepare styrene, and the reaction is carried out for 10 minutes at normal temperature and normal pressure, so that the conversion rate of phenylacetylene reaches 98.2%, and the selectivity of styrene reaches 93%. Pd@TMC1 has stable cycle performance and universality for selective hydrogenation of alkyne compounds, so that the Pd@TMC1 has wide application prospect and commercial value.
Description
Technical Field
The invention relates to the technical field of catalyst preparation and hydrogenation, relates to a triazine molecular cage supported palladium catalyst, a preparation method and application thereof, and in particular relates to a preparation method of a triazine molecular cage packed palladium nanocluster heterogeneous catalyst and application thereof in selective hydrogenation of alkyne compounds.
Background
Olefins are indispensable in our social industry development and can be used as raw materials for various fine chemicals, for example, styrene as an important chemical intermediate in the polymerization industry. In the prior mature production technology of styrene, the extraction of styrene from pyrolysis petroleum is a main styrene preparation method, and the cost is low and the raw materials are easy to obtain. It is inevitable that small amounts of phenylacetylene are often entrained in the resulting styrene, and that traces of phenylacetylene are sufficient to cause a decrease in the polymerization rate of the styrene in the subsequent polymerization stage, a decrease in the strength of the polymerized product, and poisoning of the catalyst. Selective hydrogenation of acetylenes to purify olefins is the preferred strategy, but the goal of having both high conversion and good selectivity, and maintaining high stability, places more stringent demands on catalyst design and preparation.
The inherent advantage of metallic palladium (Pd) having a high affinity for H 2 makes Pd-based catalysts outstanding in heterogeneous hydrogenation reactions. Large particles of Pd have stable properties but low atom utilization, and single-atom form of Pd can provide sufficient active sites but are easy to agglomerate, and difficult to recycle. The Pd nanocluster on the atomic scale guarantees the adsorption sites of the reaction substrate and hydrogen, and has the advantages of controllable form, adjustable electronic property, easy recycling and the like. On the other hand, excessive activity of Pd metal can cause alkyne compounds to be excessively hydrogenated into alkanes, introducing new impurities. Thus, inhibiting the formation of byproducts is another difficulty that the catalyst breaks through. Common solutions include: isolating the active sites using an organic/inorganic capping agent, introducing another non-active metal to alloy with Pd, encapsulating the metal inside an auxiliary material, etc. In fact, industrially valuable catalysts do not increase selectivity at the expense of conversion. Active metal sites are not wasted, and the adsorption/desorption capacity of the Pd nanocluster to a target product (styrene) is optimized by modifying the electronic property of the Pd nanocluster surface.
In previous studies, various novel supports were used to assist the active metals such as molecular sieves, carbon materials, metal oxides, MOFs, COFs, and the like. The discrete three-dimensional organic cage is an emerging porous material, and has the special properties of discrete internal cavities, flexible pore channel structures, solution treatment and the like. The adjustable cavity size of the organic cage not only can control the nucleation and growth of metal clusters, but also can provide a limited space for the recognition and combination of reaction sites. However, self-assembly of organic precursor units by covalent bond formation tends to be kinetically more difficult to produce large-sized organic cages, while smaller sizes of organic cages result in greater diffusion resistance to the diffusion of reactants and products. Therefore, in order to solve the diffusion resistance of the microporous three-dimensional organic cage to the diffusion of reactants and products, it is necessary to manufacture a large-sized organic cage with stable structure to load metals.
The present invention has been made to solve the above problems.
Disclosure of Invention
In order to solve the technical defects mentioned in the background, the invention aims to provide a triazine molecular cage loaded Pd nanocluster, which is used for realizing in-situ encapsulation of the Pd nanocluster in a large-size cavity of the triazine molecular cage. The catalyst can realize the conversion of phenylacetylene into styrene with high activity, high selectivity and high stability under the reaction conditions of normal temperature and normal pressure hydrogen.
According to the invention, a large-size triazine molecular cage (TMC 1) is prepared as a carrier, and Pd nanoclusters are encapsulated in a cavity of TMC1 by an in-situ reduction method, so that the Pd@TMC1 composite catalyst is prepared. The discrete cage cavities not only control the size of the Pd nanoclusters, but also prevent cluster aggregation and metal leaching. The Pd@TMC1 catalyst prepared by the method can be applied to catalyzing phenylacetylene hydrogenation reaction to prepare styrene, and the reaction is carried out for 10 minutes at normal temperature and normal pressure, so that the conversion rate of phenylacetylene reaches 98.2%, and the selectivity of styrene reaches 93%. Pd@TMC1 has stable cycle performance and universality for selective hydrogenation of alkyne compounds, so that the Pd@TMC1 has wide application prospect and commercial value.
The technical scheme of the invention is as follows:
the invention provides a triazine molecular cage supported palladium catalyst, which is Pd@TMC1 catalyst, and comprises a carrier and an active component, wherein the carrier comprises a triazine molecular cage TMC1, the active component is a palladium nanocluster, and the palladium nanocluster is encapsulated in an internal cavity of the triazine molecular cage TMC 1; the Pd@TMC1 catalyst is in a non-smooth sphere shape, the particle size of the Pd@TMC1 catalyst is 50-200 nm, and the particle size of the Pd nanocluster encapsulated in the internal cavity of the triazine molecular cage TMC1 is 0.8-2.8 nm; the palladium loading is 0.3 to 3wt% based on the total mass of the catalyst.
Preferably, the triazine molecular cage TMC1 is obtained by reacting 8 pieces of 2,4, 6-tris (4-aldehyde phenyl) -1,3, 5-triazine and 12 pieces of (R, R) -cyclohexanediamine to generate 24 imine bonds and removing 24 water molecules.
Preferably, the specific surface area of the triazine molecular cage TMC1 is 500m 2/g.
Preferably, the cavity size of the triazine molecular cage TMC1 obtained by structure optimization simulation calculation is 1.67nm; the molecular weight of the triazine molecular cage TMC1 is 4084.05.
Preferably, the average particle size of the Pd@TMC1 catalyst is 100nm, and the average particle size of the Pd nanoclusters encapsulated in the internal cavity of the triazine molecular cage TMC1 is 1.62nm.
The second aspect of the invention provides a preparation method of the triazine molecular cage supported palladium catalyst according to the first aspect of the invention, which comprises the following steps:
(1) Synthesizing an organic cage material triazine molecular cage TMC1 containing triazine units;
(2) Taking the triazine molecular cage TMC1 prepared in the step (1) as a carrier-supported palladium active component.
Preferably, step (1) comprises the steps of:
(11) Dissolving 2,4, 6-tris (4-aldehyde phenyl) -1,3, 5-triazine in dichloromethane to obtain an aldehyde solution; dissolving (R, R) -cyclohexanediamine in methylene dichloride to obtain an amine solution;
(12) Injecting the amine solution obtained in the step (11) into aldehyde solution by using a microinjection pump, and stirring to perform an amine-aldehyde condensation reaction;
(13) Filtering to remove insoluble impurities after the reaction is finished, and concentrating the organic solvent by rotary evaporation to obtain a concentrated reaction mixture;
(14) And (3) adding methanol into the concentrated reaction mixture obtained in the step (13), centrifugally collecting precipitate, and drying to obtain the triazine molecular cage TMC1.
Preferably, in step (11), 180 to 250mg of 2,4, 6-tris (4-aldehydophenyl) -1,3, 5-triazine is dissolved in 50 to 200mL of methylene chloride to obtain an aldehyde solution; dissolving 70-120 mg (R, R) -cyclohexanediamine in 10-50mL of methylene dichloride to obtain an amine solution;
in the step (12), the flow rate of the microinjection pump is 5 mL/h-100 mL/h;
In the step (12), the reaction temperature is 0-25 ℃, and the reaction stirring time is 12-48 h;
in the step (13), the organic solvent is concentrated by rotary evaporation until the reaction mixture is 2-10 mL;
In the step (14), 20 to 200mL of methanol is added, and the volume ratio of the methanol to the reaction mixture remained in the step (13) is (15 to 30): 1, centrifugally collecting sediment; the drying conditions are as follows: vacuum drying at 40-70 deg.c for 8-12 hr.
Preferably, step (2) comprises the steps of:
(21) Dissolving the triazine molecular cage TMC1 in dichloromethane, adding Pd (OAc) 2/CH2Cl2 drops into the solution, and continuously stirring for 8-12 h;
(22) Adding a methanol solution containing sodium borohydride into the third mixture obtained in the step (21), and continuing stirring to react;
(23) And after the reaction is finished, evaporating the solvent by rotation, adding methanol for soaking, centrifugally collecting the solid, and drying to obtain the triazine molecular cage supported palladium catalyst Pd@TMC1.
Preferably, in the step (21), 100-300 mg of triazine molecular cage TMC1 is dissolved in 20-50 mL of dichloromethane, 2.1-6.4 mg of Pd (OAc) 2/CH2Cl2 drops are added into the solution, and the volume of the Pd (OAc) 2/CH2Cl2 drops is 0.1-1 mL;
in the step (21), the continuous stirring time is 8-12 h;
In the step (22), the methanol solution containing sodium borohydride is 10-40 mg of methanol solution containing sodium borohydride, and the volume of the methanol solution containing sodium borohydride is 0.5-2 mL;
in the step (22), stirring and reacting for 2-6 h;
in step (23), the drying conditions are: vacuum drying at 50-100 deg.c for 3-6 hr.
The third aspect of the invention provides an application of the triazine molecular cage supported palladium catalyst of the first aspect of the invention, wherein the Pd@TMC1 catalyst is used as a catalyst for selective hydrogenation reaction of alkyne compounds.
Preferably, the Pd@TMC1 catalyst is used as a catalyst for the selective hydrogenation reaction of phenylacetylene, the reaction is carried out for 10 minutes under normal temperature and normal pressure hydrogen, the conversion rate of the phenylacetylene reaches 98.2%, and the selectivity of the styrene reaches 93%.
The self-assembled triazine molecular cage TMC1 is successfully synthesized through dynamic covalent chemistry, and the palladium nanocluster is further encapsulated. TMC1 not only provides a strong backbone and large cavity size, but also promotes diffusion of reactant and product molecules. Meanwhile, the pyridine nitrogen rich in the triazine group not only provides nucleation sites for the palladium precursor, but also provides additional electrons for the palladium cluster, and the adsorption of the catalyst to alkyne is enhanced by modifying the electron state of the palladium surface. The discrete cage cavities, in addition to controlling the size of the palladium nanoclusters, also prevent cluster aggregation and leakage. In addition, the strong hydrophobic effect of TMC1 is effective in enriching the reaction substrate. Therefore, pd@TMC1 shows ultrahigh activity, cycle stability and universality of selective hydrogenation of different acetylene compounds in the selective hydrogenation reaction of phenylacetylene.
The invention has the following specific beneficial effects:
1. The invention successfully prepares the triazine molecular cage TMC1 with large-size cavities (1.67 nm), stable frameworks and high specific surface area (500 m 2/g), and takes the triazine molecular cage TMC1 as a carrier to successfully prepare the triazine molecular cage supported palladium catalyst. The Pd@TMC1 catalyst is in a matte spherical shape, the particle size of the Pd@TMC1 catalyst is 50-200 nm, the average particle size is 100nm, the particle size of the Pd nanocluster encapsulated in the internal cavity of the triazine molecular cage TMC1 is 0.8-2.8 nm, and the average particle size is 1.62nm.
2. The TMC1 molecular cage prepared by the invention has a cavity size (1.67 nm) in a solid state which is larger than that of a majority of multi-cage organic cages with microporous properties, so that the diffusion resistance of reactants and products in heterogeneous catalytic reaction is reduced. When the Pd@TMC1 catalyst prepared by the method is applied to the preparation of styrene by catalyzing the hydrogenation reaction of phenylacetylene, the reaction is carried out for 10 minutes under normal temperature and normal pressure hydrogen, the conversion rate of phenylacetylene can reach 98.2%, the selectivity of styrene reaches 93%, and the catalytic performance is far higher than that of palladium nanoclusters loaded by carrier-free palladium powder and other organic molecular cages.
3. According to the Pd@TMC1 catalyst, the palladium nanoclusters are encapsulated in the internal cavity of the triazine molecular cage TMC1, and the palladium nanoclusters are encapsulated in the TMC1, so that the size of the nanoclusters is limited, and the single clusters are isolated, so that the clusters are difficult to agglomerate in the reaction process, and the stability of efficient utilization of active metal sites is ensured. The catalyst provided by the invention has excellent cycle stability when being used for catalyzing phenylacetylene to prepare styrene through selective hydrogenation. Under normal temperature and normal pressure hydrogen, pd@TMC1 still maintains higher catalytic activity after being recycled for 5 times, so that the conversion rate of phenylacetylene reaches 91%, and the selectivity of styrene reaches 96%. In addition, the invention has simple reaction system and mild reaction condition, and the solid catalyst is easy to recycle.
4. The triazine functional group on the TMC1 skeleton prepared by the invention not only accelerates the encapsulation of the metal precursor through strong interaction with metal ions, but also promotes the controllable nucleation of the metal nanocluster through the stabilization of the aromatic skeleton. The triazine group has rich nitrogen atoms, and unshared local electrons on pyridine nitrogen modify the electron cloud density of the palladium nanocluster, so that the adsorption strength of Pd@TMC1 to phenylacetylene is directly promoted.
5. The invention takes 2,4, 6-tri (4-aldehyde phenyl) -1,3, 5-triazine (R, R) -cyclohexanediamine as a precursor, synthesizes an [8+12] organic cage material TMC1 through imine condensation reaction, then complexes an organic cage carrier completely dissolved in methylene dichloride solution with the metal precursor, and reduces the complex to a catalyst of an active metal cluster in situ.
6. The Pd@TMC1 catalyst prepared by the method has good universality on high-efficiency selective hydrogenation of alkyne compounds, including aliphatic alkynes, terminal alkynes and internal alkynes, aromatic hydrocarbons containing electron withdrawing/donating groups and halogen substitution, and the like.
7. Even if styrene exists in the reaction, pd@TMC1 is not hindered from realizing high-selectivity hydrogenation of phenylacetylene to styrene. The Pd@TMC1 catalyst disclosed by the invention is suitable for hydrofining of a styrene and phenylacetylene mixed raw material in actual industrial production.
8. The triazine molecular cage TMC1 prepared by the method can be used as a novel metal carrier to regulate and control the size and electronic state of metal, and the strong hydrophobicity of TMC1 is beneficial to most heterogeneous catalytic reactions.
Drawings
FIG. 1 is a schematic diagram showing the synthesis of TMC1 in example 1;
FIG. 2 is a schematic diagram of the synthesis of Pd@TMC1 catalyst prepared in example 2;
FIG. 3 is a graph of (a) an IR spectrum, (b) a thermogram, (c) an N 2 adsorption-desorption isotherm, and (d) a pore size distribution of the TMC1 prepared in example 1 and the Pd@TMC1 catalyst prepared in example 2;
FIG. 4 is a graph of (a) a scanning electron microscope and (b) a transmission electron microscope and a distribution graph of particle size of TMC1 prepared in example 1 and Pd@TMC1 catalyst prepared in example 2;
FIG. 5 is an X-ray photoelectron spectrum of (a) a dynamic light scattering profile and (b) Pd 3d after ion sputtering of the TMC1 prepared in example 1 and the Pd@TMC1 catalyst prepared in example 2;
FIG. 6 is a graph of the performance of the Pd@TMC1 catalyst prepared in example 2 for phenylacetylene hydrogenation reaction;
FIG. 7 is a graph showing the stability of Pd@FT-RCC3 prepared in example 2 in a cyclic stability test during phenylacetylene hydrogenation reaction;
FIG. 8 is a graph showing the selective hydrogenation results of Pd@TMC1 catalyst prepared in example 2 when different phenylacetylene and styrene molar ratios are used as raw materials.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the present application and should not be construed as limiting the scope of the application. Further, it is understood that various changes and modifications of the present application may be made by those skilled in the art after reading the contents of the present application, and such equivalents are also within the scope of the present application as defined in the appended claims. The specific techniques or conditions are not identified in the examples and are performed according to techniques or conditions described in the literature in this field or according to the product specifications. The materials or equipment used are conventional products available from commercial sources, not identified to the manufacturer.
Example 1: the synthesis of TMC1 is shown in FIG. 1, and the specific process is as follows:
200mg of 2,4, 6-tris (4-aldehydophenyl) -1,3, 5-triazine and 100mL of methylene chloride were successively added to a 250mL flask, and the mixture was sufficiently dissolved by sonication. 95mg of (R, R) -cyclohexanediamine were dissolved in 20mL of methylene chloride and the amine solution was injected into the aldehyde solution using a microinjection pump at a flow rate of 10mL/h. The temperature of the amine aldehyde condensation reaction is 0 ℃, and the mixed solution is continuously stirred for 24 hours after the dripping is completed. After the reaction is finished, insoluble impurities are removed by filtration, the organic solvent is concentrated to 5mL by rotary evaporation, and the temperature in the rotary evaporation process is not more than 25 ℃. Adding 95mL of methanol, centrifuging to collect white precipitate after the solution is completely and uniformly mixed, and vacuum drying at 50 ℃ for 10 hours to obtain triazine molecular cage TMC1.
The TMC1 obtained was structurally characterized:
1 The identification result of the H NMR nuclear magnetic characterization is ：1H NMR(CDCl3,600MHz),δ8.31(s,24H,-CH＝N),8.59(d,48H,-ArH),7.77(d,48H,-ArH),3.48(s,24H,-CHN),1.26-1.90(m,96H,CH2 on cyclohexane)ppm.
The mass spectrum detection result is as follows: 2043.52 ([ M+2H ] 2+),1362.68([M+3H]3+) and 1022.01 ([ M+4H ] 4+).
The cavity size of the triazine molecular cage TMC1 obtained by simulation calculation after structure optimization is 1.67nm; the molecular weight of the triazine molecular cage TMC1 is 4084.05.
The specific surface area of the prepared triazine molecular cage TMC1 is 500m 2/g.
Example 2: the synthesis of Pd@TMC1 is shown in FIG. 2, and the specific process is as follows:
200mg of TMC1 and 30mL of methylene chloride were added to the flask, stirred for 30 minutes to sufficiently dissolve TMC1, and 4.3mg of Pd (OAc) 2/CH2Cl2 droplets (0.2 mL) were added to the solution, followed by stirring for 10 hours. A freshly prepared methanol solution (0.5 mL) containing 30mg of sodium borohydride was added and stirring continued for 3h. After the reaction is finished, evaporating the solvent by rotation, adding methanol for soaking for 2 hours, centrifugally collecting the solid, and drying in vacuum at 70 ℃ for 3 hours to obtain the triazine molecular cage supported palladium nanocluster Pd@TMC1.
Example 3: various characterization analyses were performed on the triazine molecular cage TMC1 support of example 1 and the pd@tmc1 catalyst obtained in example 2.
The result shows that:
According to the infrared spectrum (fig. 3 a), both the-c=oh function (1703 cm -1) in 2,4, 6-tris (4-aldylphenyl) -1,3, 5-triazine and the-NH 2 function (3161-3344 cm -1) in (R, R) -cyclohexanediamine disappeared in TMC1, accompanied by the appearance of an imine bond (1642 cm -1). After Pd is introduced, the IR spectra of Pd@TMC1 and TMC1 are consistent, and reduction of an imine bond and destruction of a triazine structure do not occur. Thermogravimetric analysis (fig. 3 b) showed that no weight loss due to TMC1 structural decomposition was observed at 300 ℃, indicating that the organic cage was thermally stable. The samples were tested for N 2 adsorption-desorption isotherms at 77K (FIG. 3 c) and pore size was plotted (FIG. 3 d), with TMC1 and Pd@TMC1 each exhibiting a typical type I isotherm and type IV isotherms characteristic at high pressure. The cage molecules are randomly accumulated to generate microporous channels (1.2 nm) after the solvent is removed, and according to the rapid increase of the adsorption of N 2 when P/P 0 is more than 0.9, partial macropores can be deduced to exist in the cage material at the same time. Even in the case of partial collapse of the TMC1 material, an intrinsic cavity of 1.7nm was detected (fig. 3 d).
Scanning electron microscopy showed that powdered TMC1 exhibited a non-independent spherical structure with particle sizes between 50 and 200nm, with an average size of about 100nm, while the surface of the similarly sized spheres of Pd@TMC1 were slightly roughened (FIG. 4 a). The transmission electron microscopy image demonstrated that the Pd nanoclusters were uniformly dispersed on the organic cage support (fig. 4 b). 300 Pd clusters are randomly selected and the diameters are measured, the sizes of the 300 Pd clusters are between 0.8 and 2.8nm, and finally the average size of Pd nanoclusters in Pd@TMC1 is counted to be 1.62+/-0.4 nm, and the average size of the Pd nanoclusters is basically consistent with the size of the inner cavity of a host TMC1 cage. In addition, the (111) crystal face is exposed on the surface of the Pd nanoclusters.
The actual Pd content in the Pd@TMC1 catalyst of example 2 was 0.996wt% as determined by ICP.
Example 4: the spatial positions of Pd nanoclusters in the pd@tmc1 catalyst obtained in example 2 were analyzed by characterization.
The result shows that:
dynamic light scattering analysis showed that TMC1 and Pd@TMC1 had similar kinetic diameters (4-5 nm) in homogeneous solution, i.e. Pd species were completely encapsulated inside the cage. Peaks greater than 100nm in the results were assigned to the aggregation of metal particles that were left outside the cage (fig. 5 a). The loading position of Pd was further characterized by a combination of sputtering technique and X-ray photoelectron spectroscopy (XPS) analysis, the results are shown in fig. 5b. The Pd signal detected by XPS on the surface of the pd@tmc1 sample was very weak and the signal was enhanced with increasing sputtering depth, indicating that the Pd nanoclusters were more encapsulated inside the TMC1 carrier than outside.
Example 5: the Pd@TMC1 catalyst prepared in example 2 is used for catalyzing the reaction of preparing styrene by selectively hydrogenating phenylacetylene. The specific method comprises the following steps: 10mg of the catalyst, 1mmol of phenylacetylene, 10mL of ethanol as a solvent, and 40. Mu.L of n-dodecane (an internal standard substance) were charged into a 50mL three-necked flask. The reaction temperature was room temperature (20-25 ℃), and the hydrogen balloon provided a source of hydrogen. After purging with high purity N 2 times and H 2 displacement of N 2 in the flask, stirring and reaction were started, samples were taken every two minutes as the reaction proceeded, and analyzed by gas chromatography. As a result, as shown in FIG. 6, the Pd@TMC1 catalyst had a phenylacetylene conversion of 98.2% in 10min at normal temperature and pressure, wherein the styrene selectivity in the product was 93%.
Example 6: the Pd@TMC1 catalyst prepared in example 2 was evaluated for its cycling stability in the reaction of preparing styrene by selective hydrogenation of phenylacetylene. The specific method comprises the following steps: 10mg of the catalyst, 1mmol of phenylacetylene, 10mL of ethanol as a solvent, and 40. Mu.L of n-dodecane (an internal standard substance) were charged into a 50mL three-necked flask. The reaction temperature was room temperature (20-25 ℃), and the hydrogen balloon provided a source of hydrogen. After purging with high purity N 2 times and H 2 displacement of N 2 in the flask, stirring and reaction were started, and after 10 minutes the reaction was stopped and analyzed by gas chromatography. The catalyst after the reaction is filtered and recovered, centrifugally washed by ethanol for 10 times, then put into a vacuum oven for drying at 70 ℃, and continuously used in the next round of reaction, and the operation steps of the five reactions are consistent. After 5 times of cyclic reaction, the Pd@TMC1 catalyst can still keep excellent catalytic activity, the conversion rate of phenylacetylene is 91%, and the selectivity of styrene is 96%. This shows that the triazine molecular cage has a very strong anchoring effect on the active metal site Pd, so that it does not agglomerate or leach out during the reaction process and the activity is greatly lost.
Examples 7 to 11: the Pd@TMC1 catalyst prepared in example 2 is used for catalyzing the selective addition reaction of phenylacetylene mixed styrene. The molar ratio of phenylacetylene to styrene in the reaction substrate is sequentially 1: 9. 1:7,5: 5. 7:3 and 9:1, the total amount of phenylacetylene and styrene was 1mmol. The specific method comprises the following steps: 10mg of the catalyst, 1mmol of the reaction substrate, 10mL of ethanol as a solvent, and 40. Mu.L of n-dodecane (an internal standard substance) were charged into a 50mL three-necked flask. The reaction temperature was room temperature (20-25 ℃), and the hydrogen balloon provided a source of hydrogen. After 5 purges with high purity N 2 and H 2 displacement of N 2 in the flask, stirring and reaction were started, samples were taken at intervals, and the product was analyzed by gas chromatography until the phenylacetylene conversion exceeded 97%. As a result of the reaction, as shown in FIG. 8, the reaction substrate consisted of five different molar ratios of phenylacetylene and styrene, and the Pd@TMC1 catalyst was able to preferentially add the C.ident.C bond to C=C. The proportion of styrene in the composition of the product after the reaction can exceed 92%, which means that even if styrene is present in the reaction, the Pd@TMC1 is not hindered from realizing the high selectivity hydrogenation of phenylacetylene to styrene. This example demonstrates that the Pd@TMC1 catalyst is suitable for hydrofining of a styrene and phenylacetylene mixed feedstock in actual industrial production.
Examples 12 to 24: examples of the use of the Pd@TMC1 heterogeneous catalyst prepared in example 2 for the preparation of olefinic compounds by hydrogenation of various acetylenic compounds the procedure of examples 12 to 24 is the same as that of example 5, except that certain reaction conditions (type of reaction substrate, reaction time) are changed, and the specific changed reaction conditions and corresponding reaction results of each example are shown in Table 1.
It can be seen from examples 12 to 24 that the Pd NCs defined by the large-size triazine organic cage TMC1 have no specificity in achieving both high activity and high selectivity of phenylacetylene hydrogenation. In view of the high activity of pd@tmc1, the reaction substrates tested all gave excellent olefin selectivity (greater than 88%) at conversions greater than 90%. The different electron-nature substituents (-NO 2,-NH2,-CH3,-OCH3) at the para-position of the benzene ring have NO significant adverse effect on the catalytic efficiency and selectivity of the reaction (examples 12-15). The higher olefin yields that are readily achieved by the more sterically hindered ortho substituent-CH 3 (example 17) and the centrally located 1-phenyl-1-propyne (example 18) and the bulky substrate molecule diphenylacetylene (example 16) under the catalysis of Pd@TMC1, benefit from the large size of the cavity provided by the TMC1 support to eliminate the steric hindrance. In addition, phenylacetylene substituted with halogen (F, cl, br) can completely retain halogen after hydrogenation, and is not limited in industrial application due to equipment damage (examples 19-21). For alkynes on paraffins having different substituents, the reaction system was rapidly and selectively hydrogenated to the corresponding olefins at normal temperature and pressure (examples 22 to 24). In summary, these results strongly demonstrate the potential of Pd@TMC1 for use in the catalytic selective hydrogenation of a wide range of acetylenic compounds.
TABLE 1 reaction results under different reaction conditions
Claims (10)
1. The triazine molecular cage supported palladium catalyst is characterized by comprising a carrier and an active component, wherein the carrier comprises a triazine molecular cage TMC1, the active component is a palladium nanocluster, and the palladium nanocluster is encapsulated in an inner cavity of the triazine molecular cage TMC 1; the Pd@TMC1 catalyst is in a non-smooth sphere shape, the particle size of the Pd@TMC1 catalyst is 50-200 nm, and the particle size of the Pd nanocluster encapsulated in the internal cavity of the triazine molecular cage TMC1 is 0.8-2.8 nm; the palladium loading is 0.3 to 3wt% based on the total mass of the catalyst.
2. The triazine molecular cage supported palladium catalyst of claim 1, wherein the triazine molecular cage TMC1 is obtained by reacting 82, 4, 6-tris (4-aldehydylphenyl) -1,3, 5-triazines with 12 (R, R) -cyclohexanediamines to form 24 imine bonds and removing 24 water molecules; the specific surface area of the triazine molecular cage TMC1 is 500m 2/g; the cavity size of the triazine molecular cage TMC1 is 1.67nm; the molecular weight of the triazine molecular cage TMC1 is 4084.05.
3. The triazine molecular cage supported palladium catalyst of claim 1, wherein the average particle size of the pd@tmc1 catalyst is 100nm and the average particle size of the Pd nanoclusters encapsulated in the internal cavity of the triazine molecular cage TMC1 is 1.62nm.
4. A process for the preparation of a triazine molecular cage supported palladium catalyst according to any one of claims 1 to 3, comprising the steps of:
(1) Synthesizing an organic cage material triazine molecular cage TMC1 containing triazine units;
(2) Taking the triazine molecular cage TMC1 prepared in the step (1) as a carrier-supported palladium active component.
5. The method of claim 4, wherein step (1) comprises the steps of:
(11) Dissolving 2,4, 6-tris (4-aldehyde phenyl) -1,3, 5-triazine powder in dichloromethane to obtain aldehyde solution; dissolving (R, R) -cyclohexanediamine in methylene dichloride to obtain an amine solution;
(12) Injecting the amine solution obtained in the step (11) into aldehyde solution by using a microinjection pump, and stirring to perform an amine-aldehyde condensation reaction;
(13) Filtering to remove insoluble impurities after the reaction is finished, and concentrating the organic solvent by rotary evaporation to obtain a concentrated reaction mixture;
(14) And (3) adding methanol into the concentrated reaction mixture obtained in the step (13), centrifugally collecting precipitate, and drying to obtain the triazine molecular cage TMC1.
6. The process according to claim 5, wherein 180 to 250mg of 2,4, 6-tris (4-aldehydophenyl) -1,3, 5-triazine is dissolved in 50 to 200mL of methylene chloride to obtain an aldehyde solution in step (11); dissolving 70-120 mg (R, R) -cyclohexanediamine in 10-50mL of methylene dichloride to obtain an amine solution;
in the step (12), the flow rate of the microinjection pump is 5 mL/h-100 mL/h;
In the step (12), the reaction temperature is 0-25 ℃, and the reaction stirring time is 12-48 h;
in the step (13), the organic solvent is concentrated by rotary evaporation until the reaction mixture is 2-10 mL;
In the step (14), 20 to 200mL of methanol is added, and the volume ratio of the methanol to the reaction mixture remained in the step (13) is (15 to 30): 1, centrifugally collecting sediment; the drying conditions are as follows: vacuum drying at 40-70 deg.c for 8-12 hr.
7. The method of claim 4, wherein step (2) comprises the steps of:
(21) Dissolving the triazine molecular cage TMC1 in dichloromethane, adding Pd (OAc) 2/CH2Cl2 drops into the solution, and continuously stirring for 8-12 h;
(22) Adding a methanol solution containing sodium borohydride into the third mixture obtained in the step (21), and continuing stirring to react;
(23) And after the reaction is finished, evaporating the solvent by rotation, adding methanol for soaking, centrifugally collecting the solid, and drying to obtain the triazine molecular cage supported palladium catalyst Pd@TMC1.
8. The method according to claim 7, wherein in the step (21), 100 to 300mg of triazine molecular cage TMC1 is dissolved in 20 to 50mL of methylene chloride, 2.1 to 6.4mg of Pd (OAc) 2/CH2Cl2 droplets are added to the solution, and the volume of the Pd (OAc) 2/CH2Cl2 droplets is 0.1 to 1mL;
in the step (21), the continuous stirring time is 8-12 h;
In the step (22), the methanol solution containing sodium borohydride is 10-40 mg of methanol solution containing sodium borohydride, and the volume of the methanol solution containing sodium borohydride is 0.5-2 mL;
in the step (22), stirring and reacting for 2-6 h;
in step (23), the drying conditions are: vacuum drying at 50-100 deg.c for 3-6 hr.
9. Use of a triazine molecular cage supported palladium catalyst according to any one of claims 1-3, wherein the pd@tmc1 catalyst is used as a catalyst for the selective hydrogenation of acetylenic compounds.
10. The use according to claim 9, wherein the Pd@TMC1 catalyst is used as a catalyst for the selective hydrogenation of phenylacetylene, the reaction is carried out for 10 minutes under normal temperature and normal pressure hydrogen, the conversion rate of phenylacetylene reaches 98.2%, and the selectivity of styrene reaches 93%; after recycling for 5 times, the conversion rate of phenylacetylene reaches 91%, and the selectivity of styrene reaches 96%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410059121.7A CN118045629A (en) | 2024-01-15 | 2024-01-15 | Triazine molecular cage supported palladium catalyst and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410059121.7A CN118045629A (en) | 2024-01-15 | 2024-01-15 | Triazine molecular cage supported palladium catalyst and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118045629A true CN118045629A (en) | 2024-05-17 |
Family
ID=91045948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410059121.7A Pending CN118045629A (en) | 2024-01-15 | 2024-01-15 | Triazine molecular cage supported palladium catalyst and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118045629A (en) |
-
2024
- 2024-01-15 CN CN202410059121.7A patent/CN118045629A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Liu et al. | In situ one-step synthesis of metal–organic framework encapsulated naked Pt nanoparticles without additional reductants | |
| CN110016126B (en) | Conjugated microporous polymer and preparation method and application thereof | |
| Yu et al. | Cobalt-based metal organic framework as precursor to achieve superior catalytic activity for aerobic epoxidation of styrene | |
| EP2746226B1 (en) | Method for preparing composites comprising crystalline hybrid nanoporous material powders | |
| Frindy et al. | Copper nanoparticles supported on graphene as an efficient catalyst for A 3 coupling of benzaldehydes | |
| CN113751076B (en) | Bis-imidazolium palladium-supported porous organic polymer catalyst and preparation method and application thereof | |
| Liu et al. | Synthesis, post-modification and catalytic properties of metal-organic framework NH2-MIL-53 (Al) | |
| CN102516222B (en) | Method for preparing cyclohexyl crown ether by catalytic hydrogenation of carbon supported ruthenium catalyst | |
| CN111359671B (en) | Preparation method of palladium-loaded or platinum-loaded zirconium-based microporous coordination polymer composite material | |
| YeonáShin et al. | Palladium nanoparticles captured onto spherical silica particles using a urea cross-linked imidazolium molecular band | |
| CN101028604A (en) | Multi-phase chiral metal catalyst and its production | |
| CN113617388A (en) | Silver nano catalyst based on porous pyridyl covalent organic framework and preparation method and application thereof | |
| CN113372525B (en) | Covalent organic framework material with molecular imprinting type and preparation method and application thereof | |
| CN105727990A (en) | Preparation method of Pd-Cu-series supported hydrogenation catalyst | |
| CN118045629A (en) | Triazine molecular cage supported palladium catalyst and preparation method and application thereof | |
| CN114797929A (en) | Porous nitrogen modified carbon material loaded cobalt-based catalyst and preparation and application thereof | |
| CN114515604A (en) | Quaternary phosphonium salt polymer loaded bimetallic monatomic catalyst, preparation method and application | |
| WO2023207584A1 (en) | Eggshell-type catalyst, preparation method therefor, and use thereof in propylene hydroformylation reaction | |
| Veeramani et al. | Decoration of silver nanoparticles on nitrogen-doped nanoporous carbon derived from zeolitic imidazole framework-8 (ZIF-8) via in situ auto-reduction | |
| Karimi et al. | Highly dispersed palladium nanoparticles supported on an imidazolium-based ionic liquid polymer: an efficient catalyst for oxidation of alcohols | |
| KR101911173B1 (en) | Method for preparing metal-organic composite of containing 4b group metal elements | |
| CN105727992A (en) | Pd-Ni-series supported hydrogenation catalyst | |
| CN114797928B (en) | Core-shell ZIFs pyrolysis-derived porous carbon material cobalt catalyst and preparation method thereof | |
| CN114849753A (en) | Preparation method and application of palladium metal cluster catalyst | |
| CN105732284A (en) | Selective hydrogenation method for C3 fraction |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |