CN115193481A - Co (II) -salicylaldimine based catalyst with stable in-situ derived MOF heterojunction and preparation method and application thereof - Google Patents
Co (II) -salicylaldimine based catalyst with stable in-situ derived MOF heterojunction and preparation method and application thereof Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 72
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000013216 MIL-68 Substances 0.000 claims abstract description 85
- 239000012621 metal-organic framework Substances 0.000 claims abstract description 59
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims abstract description 48
- SMQUZDBALVYZAC-UHFFFAOYSA-N salicylaldehyde Chemical compound OC1=CC=CC=C1C=O SMQUZDBALVYZAC-UHFFFAOYSA-N 0.000 claims abstract description 32
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000001257 hydrogen Substances 0.000 claims abstract description 27
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 27
- 235000019253 formic acid Nutrition 0.000 claims abstract description 24
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims abstract description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 150000001868 cobalt Chemical class 0.000 claims abstract description 20
- 230000001699 photocatalysis Effects 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 238000000746 purification Methods 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 4
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea group Chemical group NC(=S)N UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims description 10
- 238000001212 derivatisation Methods 0.000 claims description 9
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 150000002471 indium Chemical class 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 239000003446 ligand Substances 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- BSUSEPIPTZNHMN-UHFFFAOYSA-L cobalt(2+);diperchlorate Chemical compound [Co+2].[O-]Cl(=O)(=O)=O.[O-]Cl(=O)(=O)=O BSUSEPIPTZNHMN-UHFFFAOYSA-L 0.000 claims description 4
- 238000005286 illumination Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- VDFIVJSRRJXMAU-UHFFFAOYSA-N 1,3-dimethyl-2-phenyl-2h-benzimidazole Chemical group CN1C2=CC=CC=C2N(C)C1C1=CC=CC=C1 VDFIVJSRRJXMAU-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- GVPFVAHMJGGAJG-UHFFFAOYSA-L cobalt dichloride Chemical compound [Cl-].[Cl-].[Co+2] GVPFVAHMJGGAJG-UHFFFAOYSA-L 0.000 claims description 2
- UFMZWBIQTDUYBN-UHFFFAOYSA-N cobalt dinitrate Chemical compound [Co+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O UFMZWBIQTDUYBN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001981 cobalt nitrate Inorganic materials 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000006213 oxygenation reaction Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- YUKQRDCYNOVPGJ-UHFFFAOYSA-N thioacetamide Chemical compound CC(N)=S YUKQRDCYNOVPGJ-UHFFFAOYSA-N 0.000 claims description 2
- DLFVBJFMPXGRIB-UHFFFAOYSA-N thioacetamide Natural products CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims description 2
- 238000007146 photocatalysis Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 230000003197 catalytic effect Effects 0.000 abstract description 10
- 238000005215 recombination Methods 0.000 abstract description 2
- 230000006798 recombination Effects 0.000 abstract description 2
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 11
- 238000000354 decomposition reaction Methods 0.000 description 10
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 5
- 238000003917 TEM image Methods 0.000 description 4
- 239000012264 purified product Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- BPELEZSCHIEMAE-UHFFFAOYSA-N salicylaldehyde imine Chemical compound OC1=CC=CC=C1C=N BPELEZSCHIEMAE-UHFFFAOYSA-N 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001027 hydrothermal synthesis Methods 0.000 description 3
- 239000011941 photocatalyst Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000006356 dehydrogenation reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002674 ointment Substances 0.000 description 2
- 238000013032 photocatalytic reaction Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XURCIPRUUASYLR-UHFFFAOYSA-N Omeprazole sulfide Chemical compound N=1C2=CC(OC)=CC=C2NC=1SCC1=NC=C(C)C(OC)=C1C XURCIPRUUASYLR-UHFFFAOYSA-N 0.000 description 1
- 239000002262 Schiff base Substances 0.000 description 1
- 150000004753 Schiff bases Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 150000001450 anions Chemical class 0.000 description 1
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- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 239000007810 chemical reaction solvent Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000003635 deoxygenating effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010952 in-situ formation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-M perchlorate Inorganic materials [O-]Cl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-M 0.000 description 1
- VLTRZXGMWDSKGL-UHFFFAOYSA-N perchloric acid Chemical group OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 1
- 238000005424 photoluminescence Methods 0.000 description 1
- 238000000628 photoluminescence spectroscopy Methods 0.000 description 1
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- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- B01J35/39—
-
- 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
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/16—Catalysts comprising hydrides, coordination complexes or organic compounds containing coordination complexes
- B01J31/22—Organic complexes
- B01J31/2204—Organic complexes the ligands containing oxygen or sulfur as complexing atoms
- B01J31/2208—Oxygen, e.g. acetylacetonates
- B01J31/2226—Anionic ligands, i.e. the overall ligand carries at least one formal negative charge
- B01J31/223—At least two oxygen atoms present in one at least bidentate or bridging ligand
- B01J31/2239—Bridging ligands, e.g. OAc in Cr2(OAc)4, Pt4(OAc)8 or dicarboxylate ligands
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/22—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of gaseous or liquid organic compounds
-
- 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
- B01J2531/00—Additional information regarding catalytic systems classified in B01J31/00
- B01J2531/30—Complexes comprising metals of Group III (IIIA or IIIB) as the central metal
- B01J2531/33—Indium
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2203/00—Integrated processes for the production of hydrogen or synthesis gas
- C01B2203/02—Processes for making hydrogen or synthesis gas
- C01B2203/0266—Processes for making hydrogen or synthesis gas containing a decomposition step
- C01B2203/0277—Processes for making hydrogen or synthesis gas containing a decomposition step containing a catalytic decomposition step
Abstract
The invention discloses a Co (II) -salicylaldimine-based catalyst with stable in-situ derived MOF heterojunction, and a preparation method and application thereof. The preparation method comprises the following steps: reacting NH 2 ‑MIL‑68(In)@In 2 S 3 The alcohol solution and the salicylaldehyde are mixed according to the solid-to-liquid ratio (mg/mu L) of (2-20) to (1-2), then the mixture reacts for 18-30 h at the temperature of 80-120 ℃, and the salicylaldehyde-NH is obtained after purification and drying 2 ‑MIL‑68(In)@In 2 S 3 (ii) a Then evenly mixing the catalyst with divalent cobalt salt according to the mass ratio of (4-10) to (1-3), reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction. The catalyst can effectively inhibit the recombination of photo-generated electrons and holes, thereby prolonging the service life of the electrons and the holes, increasing the electron concentration and leading the prepared catalyst to have good charge transferThe efficiency, and the catalyst has excellent catalytic activity and catalytic stability when being used for photocatalytic hydrogen production from formic acid.
Description
Technical Field
The invention relates to the technical field of catalytic materials, in particular to a Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction, and a preparation method and application thereof.
Background
Hydrogen is a sustainable and benign energy source that is expected to replace the traditional fossil energy, and is concerned by high energy density, no toxicity, abundant earth resources and high energy efficiency. However, the challenges of efficient, low-cost, safe storage, handling, and distribution and rapid release of hydrogen gas have limited the use of hydrogen energy in industry and academia. Formic acid (HCOOH) is taken as a unique liquid organic hydrogen carrier and has good H 2 Capacity (4.4 wt%,53.4 g/L) and low toxicity, and can provide the fuel cell with in-situ hydrogen supply for direct use at normal temperature. Formic acid is generally obtained by dehydrogenation
And dehydration reaction
Decomposition proceeds, but the dehydration reaction process is thermodynamically more unfavorable, and the generated CO is toxic to the catalyst and even the fuel cell. In contrast, the dehydrogenation reaction produces CO 2 Has no adverse side effects, and can be used for producing high value-added chemicals (HCOOH, CH) with other catalysts 3 OH、C 2 H 5 OH、CH 4 、C 2 H 4 Etc.), the desired carbon cycling reaction can be achieved.
Compared with other energy conversion forms, the method for preparing H by decomposing formic acid by using solar energy 2 Is one of the hottest novel energy conversion forms studied at present. However, for photocatalytic FA decomposition to produce H 2 The photocatalyst has the defects of light corrosion, low solar energy utilization rate, low photoproduction charge separation efficiency and the like, and needs to be improved. For example, the prior art discloses an NH 2 half-MIL-68The conductor photocatalyst has good chemical stability, a high-porosity structure and a function of freely adjusting in a system, but has the problem of low catalytic activity caused by poor photo-generated charge separation efficiency and carrier transfer efficiency.
Disclosure of Invention
The invention aims to overcome the defects and defects of low catalytic activity of the existing photocatalyst caused by low photo-generated charge separation efficiency and low carrier transfer efficiency, and provides a preparation method of Co (II) -salicylaldimine based catalyst with stable in-situ derived MOF heterojunction, which uses NH 2 the-MIL-68 (In) metal organic framework is used as a substrate, a homologous heterojunction is constructed In situ through semi-vulcanization, salicylaldehyde is grafted, a metal active site is anchored by salicylaldehyde imine while a highly ordered porous structure of the homologized heterojunction is maintained, and photo-generated charge separation and carrier migration are promoted under the combined action of the salicylaldehyde imine and the heterojunction, so that the catalytic activity of the catalyst is improved.
It is another object of the invention to provide an in situ derived MOF heteroj unction stable Co (II) -salicylaldimine based catalyst.
The invention further aims to provide application of the in-situ derivative MOF heterojunction-stable Co (II) -salicylaldimine catalyst in photocatalytic hydrogen production from formic acid.
The above purpose of the invention is realized by the following technical scheme:
a preparation method of an in-situ derivative MOF heterojunction stable Co (II) -salicylaldimine group catalyst comprises the following steps:
s1, adding NH 2 -MIL-68(In)@In 2 S 3 The alcohol solution is mixed with salicylaldehyde and then reacts for 18 to 30 hours at the temperature of between 80 and 120 ℃, and the salicylaldehyde-NH is obtained after purification and drying 2 -MIL-68(In)@In 2 S 3 ；
S2, leading salicylaldehyde-NH in S1 2 -MIL-68(In)@In 2 S 3 Uniformly mixing divalent cobalt salt and tetrahydrofuran, reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction;
wherein, NH is described in S1 2 -MIL-68(In)@In 2 S 3 The solid-to-liquid ratio (mg/mu L) of the salicylic aldehyde to the salicylic aldehyde is (2-20) to (1-2); salicylaldehyde-NH in S2 2 -MIL-68(In)@In 2 S 3 The weight ratio of the cobalt salt to the bivalent cobalt salt is (4-10) to (1-3).
The invention uses NH 2 In situ formation of NH with matrix-MIL-68 (In) 2 -MIL-68(In)@In 2 S 3 Semiconductor heterojunction to improve light absorption capability, and grafting salicylaldehyde through salicylaldehyde and NH 2 Schiff base formed by the-MIL-68 (In) ligand promotes the transfer of photogenerated electrons and holes, and further improves the carrier efficiency. Co (II) is anchored on salicylaldehyde under the action of chemical bonds, can receive photoproduction electrons to carry out reduction reaction so as to decompose formic acid to prepare hydrogen, and can avoid the reduction of catalytic activity caused by aggregation with other active sites.
Specifically, NH as described in S1 2 -MIL-68(In)@In 2 S 3 The preparation method comprises the following steps:
first NH 2 adding-MIL-68 (In) and a sulfur source into an alcohol solvent, and then reacting for 0.5-5 h at the temperature of 150-200 ℃ to obtain NH 2 -MIL-68(In)@In 2 S 3 (In)。
The NH 2 The mass ratio of the MIL-68 (In) to the sulfur source is 1 (1.5-2.5).
Specifically, the sulfur source may be thiourea and/or thioacetamide.
In a specific embodiment, the divalent cobalt salt in step S2 of the present invention may be one or more of cobalt perchlorate, cobalt chloride and cobalt nitrate; preferably cobalt perchlorate.
When the anion in the divalent cobalt salt is perchlorate, an open coordination environment can be provided, and further the formation of a cobalt hydride intermediate in the proton reduction process is promoted, so that the activity of cobalt hydride is improved.
The in-situ derivative MOF heterojunction stable Co (II) -salicylaldimine group catalyst prepared by the preparation method is also within the protection scope of the invention.
In particular, the NH of the invention 2 -MIL-68 (In) can be prepared fromThe preparation method comprises the following steps:
will dissolve H 2 BDC-NH 2 The solution of ligand and indium salt is put into the temperature of 100 to 150 ℃ for reaction for 2 to 7 hours to obtain NH 2 -MIL-68 (In). Wherein, the H 2 BDC-NH 2 The mass ratio of the ligand to the indium salt is (0.1-1): (0.6-6). In addition, indium salts conventional in the art may be used in the present invention, for example, the indium salt may be indium nitrate.
The invention also protects the application of the in-situ derived MOF heterojunction stable Co (II) -salicylaldimine molecule in the photocatalytic hydrogen production from formic acid.
A method for preparing hydrogen by photocatalytic formic acid comprises the following steps: uniformly mixing the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction, formic acid, a sacrificial agent and a solvent, and reacting under the conditions of no oxygen and illumination to obtain hydrogen; the sacrificial agent is 1, 3-dimethyl-2-phenylbenzimidazole, and the solvent is a mixture of N, N-dimethylacetamide and water.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a preparation method of Co (II) -salicylaldimine based catalyst with stable in-situ derived MOF heterojunction, which uses NH 2 MIL-68 (In) is used as a matrix, a homojunction is constructed In situ through semi-vulcanization, and salicylaldehyde is grafted to anchor a metal catalytic active site, so that the composition of photo-generated electrons and holes can be effectively inhibited, the service lives of the electrons and the holes are prolonged, the electron concentration is increased, the prepared catalyst has good charge transfer efficiency, and can be used for preparing hydrogen by photocatalytic formic acid, and the hydrogen production rate reaches 18746 mu mol/gh; meanwhile, the catalyst has excellent catalytic stability, the good performance of photocatalytic decomposition of formic acid for hydrogen production is still maintained when the reaction lasts for 48 hours, and the physicochemical properties after the reaction are basically kept unchanged.
The preparation method can replace the catalytic sites with Fe, ni or Cu, and the prepared catalyst has excellent photocatalytic activity for producing hydrogen from formic acid.
Drawings
FIG. 1 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine in example 1Base catalyst and NH 2 -XRD pattern of MIL-68 (In);
FIG. 2 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 SEM picture of MIL-68 (In);
FIG. 3 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 TEM image of MIL-68 (In);
FIG. 4 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 -photocurrent response (i-t) curves and PL plots for MIL-68 (In);
FIG. 5 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 Comparison graph of hydrogen production effect of photocatalytic decomposition of formic acid by MIL-68 (In);
FIG. 6 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 -photocatalytic decomposition of MIL-68 (In) formic acid hydrogen production stability profile;
FIG. 7 is an XRD pattern of in situ derived MOF heteroj-stabilized Co (II) -salicylaldimine based catalyst after catalytic reaction in example 1;
FIG. 8 is an SEM and TEM image of an in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst catalyzed reaction in example 1.
Detailed Description
In order to more clearly and completely describe the technical scheme of the invention, the invention is further described in detail by the specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the invention, and are not used for limiting the invention, and various changes can be made within the scope defined by the claims of the invention.
Example 1
A preparation method of an in-situ derivative MOF heterojunction stable Co (II) -salicylaldimine group catalyst comprises the following steps:
s1, adding NH 2 -MIL-68(In)@In 2 S 3 The ethanol solution is mixed with salicylaldehyde and then reacts for 10 hours at the temperature of 100 ℃, and after purification and drying, the salicylaldehyde-NH is obtained 2 -MIL-68(In)@In 2 S 3 ；
S2, leading salicylaldehyde-NH in S1 2 -MIL-68(In)@In 2 S 3 Uniformly mixing divalent cobalt salt and tetrahydrofuran, reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction;
wherein, NH is described in S1 2 -MIL-68(In)@In 2 S 3 The solid-to-liquid ratio (mg/μ L) to salicylaldehyde is 5; salicylaldehyde-NH in S2 2 -MIL-68(In)@In 2 S 3 The weight ratio of the divalent cobalt salt to the divalent cobalt salt is 10.
Wherein, the above NH 2 -MIL-68 (In) can be prepared by the following preparation method:
0.234g of H 2 BDC-NH 2 And 1.156g In (NO) 3 ) 3 ·xH 2 Dissolving O in 12.4mL DMF, stirring and mixing for 10min, reacting at 125 deg.C for 5h, centrifuging to separate out light yellow powder, washing with DMF, purifying in anhydrous methanol at 60 deg.C for 48h, centrifuging the purified product, and vacuum drying at room temperature overnight to obtain NH 2 -MIL-68(In)。
NH as described above 2 -MIL-68(In)@In 2 S 3 Can be prepared by the following preparation method:
reacting NH 2 -MIL-68 (In) (100 mg) and thiourea (200 mg) were dissolved In 15mL ethanol, followed by hydrothermal reaction at 180 ℃ for 2h, cooled to room temperature, the resulting product was purified In absolute ethanol at 60 ℃ for 48h, and finally the purified product was centrifuged and vacuum dried at room temperature overnight to obtain NH 2 -MIL-68(In)@In 2 S 3 。
Example 2
A preparation method of an in-situ derivative MOF heterojunction stable Co (II) -salicylaldimine group catalyst comprises the following steps:
s1, adding NH 2 -MIL-68(In)@In 2 S 3 The ethanol solution and the salicylaldehyde are mixed and then react for 10 hours at the temperature of 100 ℃, and the salicylaldehyde-NH is obtained after purification and drying 2 -MIL-68(In)@In 2 S 3 ；
S2, leading salicylaldehyde-NH in S1 2 -MIL-68(In)@In 2 S 3 Uniformly mixing divalent cobalt salt and tetrahydrofuran, reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction;
wherein, the NH in S1 2 -MIL-68(In)@In 2 S 3 The solid-to-liquid ratio (mg/mu L) of the salicylic aldehyde to the salicylic aldehyde is 2; salicylaldehyde-NH in S2 2 -MIL-68(In)@In 2 S 3 The mass ratio of the divalent cobalt salt to the divalent cobalt salt is 4.
Wherein the above NH 2 -MIL-68 (In) can be prepared by the following preparation method:
0.180g of H 2 BDC-NH 2 And 0.78g In (NO) 3 ) 3 ·xH 2 Dissolving O in 5mL DMF, stirring and mixing for 10min, reacting at 100 deg.C for 7h, centrifuging to separate out light yellow powder, washing with DMF, purifying in anhydrous methanol at 60 deg.C for 48h, centrifuging the purified product, and vacuum drying at room temperature overnight to obtain NH 2 -MIL-68(In)。
NH as described above 2 -MIL-68(In)@In 2 S 3 Can be prepared by the following preparation method:
reacting NH 2 -MIL-68 (In) (50 mg) and thiourea (100 mg) were dissolved In 15mL ethanol, followed by hydrothermal reaction at 185 ℃ for 3h, cooling to room temperature, purifying the resulting product In absolute ethanol at 60 ℃ for 48h, and finally centrifuging and vacuum drying at room temperature overnight to obtain NH 2 -MIL-68(In)@In 2 S 3 。
Example 3
A preparation method of an in-situ derivative MOF heterojunction stable Co (II) -salicylaldimine group catalyst comprises the following steps:
s1, adding NH 2 -MIL-68(In)@In 2 S 3 The ethanol solution and the salicylaldehyde are mixed and then react for 10 hours at the temperature of 110 ℃, and the salicylaldehyde-NH is obtained after purification and drying 2 -MIL-68(In)@In 2 S 3 ；
S2, leading salicylaldehyde-NH in S1 2 -MIL-68(In)@In 2 S 3 Uniformly mixing divalent cobalt salt and tetrahydrofuran, reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction;
wherein, NH is described in S1 2 -MIL-68(In)@In 2 S 3 The solid-to-liquid ratio (mg/μ L) to salicylaldehyde is 20; salicylaldehyde-NH in S2 2 -MIL-68(In)@In 2 S 3 The mass ratio of the divalent cobalt salt to the divalent cobalt salt is 4.
Wherein, the above NH 2 -MIL-68 (In) can be prepared by the following preparation method:
0.45g of H 2 BDC-NH 2 And 2.3g In (NO) 3 ) 3 ·xH 2 Dissolving O in 25mL DMF, stirring and mixing for 10min, reacting at 130 deg.C for 6h, centrifuging to separate light yellow powder, washing with DMF, purifying in anhydrous methanol at 60 deg.C for 48h, centrifuging, and vacuum drying at room temperature overnight to obtain NH 2 -MIL-68(In)。
NH as described above 2 -MIL-68(In)@In 2 S 3 Can be prepared by the following preparation method:
reacting NH 2 -MIL-68 (In) (150 mg) and thiourea (300 mg) were dissolved In 15mL ethanol, followed by hydrothermal reaction at 180 ℃ for 2h, cooled to room temperature, the resulting product was purified In absolute ethanol at 60 ℃ for 48h, and finally the purified product was centrifuged and vacuum dried at room temperature overnight to obtain NH 2 -MIL-68(In)@In 2 S 3 。
Performance testing
(1) XRD test
Co (II) -salicylaldimine based catalyst and NH stabilized against in-situ derived MOF heterojunctions in example 1 using an X-ray diffractometer 2 The results of the crystal structure analysis of-MIL-68 (In) are shown In FIG. 1, and from FIG. 1, it can be seen that MOF heterojunction-stabilized Co (II) -salicylaldimine catalyst (b) and NH are derivatized In situ 2 MIL-68 (In) (a) was prepared successfully, co (II) -Water stabilized by In-situ derivatization of MOF heterojunctions In examples 2 and 3The XRD pattern of the salicylaldimine based catalyst was substantially identical to that of example 1.
(2) SEM and TEM testing
FIG. 2 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 SEM photograph of-MIL-68 (In), as seen from FIG. 2 (a), NH 2 MIL-68 (In) is a long rod-like structure with a relatively smooth surface, which is well documented In TEM images (fig. 3 (a)); as can be seen from FIG. 2 (b), in NH 2 -MIL-68 (In) surface-derivatized semiconductor In 2 S 3 And constructing a stable [ Co ] from salicylaldimine groups via site isolation]After the active center is catalyzed, the main body appearance of the catalyst is not changed, the catalyst is still in a rod-shaped structure, a granular covering can be observed on the surface of the rod-shaped structure, and a TEM image (figure 3 (b)) of the in-situ derivative MOF heterojunction-stable Co (II) -salicylaldimine catalyst can also clearly observe NH 2 -a covering of MIL-68 (In) surface. SEM images of in-situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalysts in examples 2-3 are substantially the same as those of example 1, all having a rod-like structure with an overlayer.
(3) Photocurrent testing and photoluminescence spectroscopy testing
NH as described in example 1 2 MIL-68 (In) and In situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalysts were subjected to photocurrent testing and photoluminescence spectral characterization. FIG. 4 (a) shows NH in example 1 2 -photocurrent response (i-t) curves for MIL-68 (In) and In situ derivatized MOF heteroj stabilized Co (II) -salicylaldimine based catalysts; wherein curve a is NH 2 The photocurrent response of MIL-68 (In), curve b is that of an In situ derivatized MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst. From the figure, it can be known that the photocurrent response value of Co (II) -salicylaldimine group catalyst with stable in-situ derivative MOF heterojunction is obviously higher than that of original NH 2 MIL-68 (In), which shows that the photocurrent density of the Co (II) -salicylaldimine-based catalyst stabilized by the In-situ derivatization MOF heterojunction is obviously enhanced, namely the Co (II) -salicylaldimine-based catalyst stabilized by the In-situ derivatization MOF heterojunction can generate more photogenerated carriers under the condition of illumination. Furthermore, in situ derivatization of MOF heterojunction stabilization can also be demonstratedThe charge transfer efficiency of the Co (II) -salicylaldimine catalyst is obviously higher than that of NH 2 -MIL-68(In)。
FIG. 4 (b) shows NH in example 1 2 Photoluminescence spectra of-MIL-68 (In) and In situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst, where curve a is NH 2 MIL-68 (In), curve b is the MOF heteroj unction stable Co (II) -salicylaldimine based catalyst derivatized In situ. As can be seen from the figure, the PL intensity of the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst is significantly lower than the original NH 2 MIL-68 (In), which shows that photo-generated electrons and holes In the Co (II) -salicylaldimine catalyst with stable In-situ derived MOF heterojunction can be efficiently separated, and further has higher photocatalytic activity.
(4) Photocatalytic hydrogen formate production test
Co (II) -salicylaldimine based catalyst stabilized by in situ derivatization of MOF heterojunctions in example 1 and NH 2 MIL-68 (In) was subjected to photocatalytic hydrogen formate production test, respectively.
The specific test method is as follows: in a 5.0mL septum-sealed glass vial, 0.1mg of test sample was dispersed in 1.80mL of N, N-Dimethylacetamide (DMA), 10. Mu.L of FA, 0.20mL of H 2 O and 45mg BIH, wherein N, N-Dimethylacetamide (DMA) and H 2 O as a reaction solvent to disperse the catalyst, BIH as a sacrificial agent to suppress carrier recombination, deoxygenating the reaction mixture with nitrogen for 5min to ensure complete removal of air, irradiating the reactor for 24h at room temperature using a 300W Xe lamp (PLS-SXE 300+ > 420 nm), and after reaction, analyzing the gas in the headspace of the vial by GC (GC 9790 PLUS) to determine the amount of hydrogen generated.
FIG. 5 shows the in situ derived MOF heterojunction stabilized Co (II) -salicylaldimine based catalyst and NH in example 1 2 Comparison graph of photocatalytic decomposition of formic acid to hydrogen of-MIL-68 (In), wherein curve a is NH 2 MIL-68 (In), and curve b is the hydrogen production performance of the Co (II) -salicylaldimine based catalyst with stable In-situ derived MOF heterojunction through photocatalytic decomposition of formic acid. The results show that compared to NH 2 MIL-68 (In), in situ derivatization of MOF heterojunction-stabilized Co (II) -salicylaldimine based catalystsThe hydrogen production performance is obviously enhanced, which shows that the hydrogen production performance of the Co (II) -salicylaldimine molecular catalyst with stable MOF heterojunction through photocatalytic decomposition of formic acid is obviously improved.
(5) Stability test of hydrogen production by photocatalytic decomposition of formic acid
FIG. 6 shows NH in example 1 2 MIL-68 (In) (curve a) MOF heterojunction-stabilized Co (II) -salicylaldimine catalyst derivatized In situ (curve b) Hydrogen production Rate as a function of catalyst time, as can be seen from FIG. 6, with NH 2 Compared with MIL-68 (In), the Co (II) -salicylaldimine catalyst with stable In-situ derived MOF heterojunction still keeps better performance of hydrogen production by photocatalytic decomposition of formic acid when the reaction lasts for 48 hours. After the in-situ derivatization MOF heterojunction-stabilized Co (II) -salicylaldimine catalyst is subjected to photocatalytic reaction, from an XRD (shown as figure 7), an SEM (scanning electron microscope) and a TEM (shown as figure 8), the physical and chemical properties of the in-situ derivatization MOF heterojunction-stabilized Co (II) -salicylaldimine catalyst are basically the same as those of the Co (II) -salicylaldimine catalyst before photocatalytic reaction, and the excellent photocatalytic stability is fully demonstrated.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A preparation method of an in-situ derivatization MOF heterojunction-stable Co (II) -salicylaldimine catalyst is characterized by comprising the following steps:
s1, adding NH 2 -MIL-68(In)@In 2 S 3 The alcohol solution is mixed with salicylaldehyde and then reacts for 18 to 30 hours at the temperature of between 80 and 120 ℃, and the salicylaldehyde-NH is obtained after purification and drying 2 -MIL-68(In)@In 2 S 3 ；
S2, leading salicylaldehyde-NH in S1 2 -MIL-68(In)@In 2 S 3 Uniformly mixing divalent cobalt salt and tetrahydrofuran, reacting for 12-36 h at room temperature, and purifying and drying to obtain the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction;
wherein, the NH in S1 2 -MIL-68(In)@In 2 S 3 The solid-to-liquid ratio (mg/mu L) of the salicylic aldehyde to the salicylic aldehyde is (2-20) to (1-2); salicylaldehyde-NH in S2 2 -MIL-68(In)@In 2 S 3 The weight ratio of the cobalt salt to the divalent cobalt salt is (4-10) to (1-3).
2. The method of claim 1, wherein the NH in S1 2 -MIL-68(In)@In 2 S 3 The preparation method comprises the following steps:
reacting NH 2 adding-MIL-68 (In) and a sulfur source into an alcohol solvent, and reacting for 0.5-5 h at 160-200 ℃ to obtain NH 2 -MIL-68(In)@In 2 S 3 (In)。
3. The method of claim 2, wherein the NH is 2 The mass ratio of-MIL-68 (In) to the sulfur source is 1 (1.5-2.5).
4. The process of claim 3, wherein the sulfur source is thiourea and/or thioacetamide.
5. The method according to claim 1, wherein the divalent cobalt salt is one or more of cobalt perchlorate, cobalt chloride and cobalt nitrate.
6. The method according to claim 5, wherein the divalent cobalt salt is cobalt perchlorate.
7. The method of claim 2, wherein the NH is 2 -MIL-68 (In) was prepared by the following preparation method:
will contain H 2 BDC-NH 2 Placing the solution of ligand and indium salt inReacting for 2-7 h at 100-150 ℃ to obtain NH 2 -MIL-68 (In); wherein, the H 2 BDC-NH 2 The mass ratio of the ligand to the indium salt is (0.1-1) to (0.6-6).
8. An in-situ derived MOF heterojunction-stable Co (II) -salicylaldimine catalyst prepared by the preparation method of any one of claims 1 to 7.
9. The application of the in-situ derived MOF heterojunction stable Co (II) -salicylaldimine based catalyst in the photocatalysis of formic acid to prepare hydrogen.
10. A method for preparing hydrogen by photocatalytic formic acid is characterized in that the Co (II) -salicylaldimine catalyst with stable in-situ derived MOF heterojunction, formic acid, a sacrificial agent and a solvent are uniformly mixed and then react under the conditions of no oxygen and illumination to obtain hydrogen;
the sacrificial agent is 1, 3-dimethyl-2-phenylbenzimidazole, and the solvent is a mixture of N, N-dimethylacetamide and water.
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| US20170182486A1 (en) * | 2014-03-28 | 2017-06-29 | The University Of Chicago | Metal-organic frameworks containing nitrogen-donor ligands for efficient catalytic organic transformations |
| CN113663716A (en) * | 2021-09-28 | 2021-11-19 | 南京工业大学 | Indium oxide loaded metal monatomic catalyst and application thereof |
| CN113976144A (en) * | 2021-11-22 | 2022-01-28 | 南昌大学 | S-type heterojunction catalyst and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20170182486A1 (en) * | 2014-03-28 | 2017-06-29 | The University Of Chicago | Metal-organic frameworks containing nitrogen-donor ligands for efficient catalytic organic transformations |
| CN113663716A (en) * | 2021-09-28 | 2021-11-19 | 南京工业大学 | Indium oxide loaded metal monatomic catalyst and application thereof |
| CN113976144A (en) * | 2021-11-22 | 2022-01-28 | 南昌大学 | S-type heterojunction catalyst and preparation method and application thereof |
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| MEIJIN ZHANG等: "An in situ derived MOF@In2S3 heterojunction stabilizes Co(II)-salicylaldimine for efficient photocatalytic formic acid dehydrogenation", CHEM. COMMUN., vol. 58, no. 51, pages 7140 - 7143 * |
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