Monatomic catalyst and application thereof
A catalyst and atom technology, applied in single-atom catalysts and their application fields, can solve the problems of low overall structural stability, loss, and small disorder of metal sites.
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[0053] The single-atom catalyst of the embodiment of the present invention is a type of crystalline porous material with a periodic network structure formed by connecting a transition metal salt and a nitrogen-containing organic ligand through self-assembly. The preparation method includes the following steps:
[0054] S1, dissolving nitrogen-containing organic ligands and transition metal salts in an organic solvent to form a solution;
[0055] Wherein, the nitrogen-containing organic ligand is selected from heterocyclic compounds whose heteroatoms are nitrogen atoms, and the transition metal salt is selected from the soluble compounds of at least 5 elements in chromium, manganese, iron (II), cobalt, nickel, copper, zinc, and cadmium. Salt;
[0056] S2. The solution is stirred, refluxed, centrifuged, washed and dried to obtain a solid powder, that is, a multi-component MOF precursor; preferably, the particle size of the multi-component MOF precursor is 100-500 nm, preferably ...
Embodiment 1
[0074] A single-atom catalyst is a nitrogen-doped carbon skeleton loaded with Zn, Cu, Ni, Co, Fe.
[0075] Concrete preparation method is:
[0076] 1. Mix 3.4g Zn(NO 3 ) 2 ·6H 2 O, 120mg Cu(NO 3 ) 2 ·3H 2 O, 145mg Ni(NO 3 ) 2 ·6H 2 O, 30mg Co(NO 3 ) 2 ·6H 2 O and 144mg Fe(NO 3 ) 2 ·6H 2 O was dissolved in 150mL methanol, stirred and mixed evenly;
[0077] 2. Dissolve 3.94g of dimethylimidazole in another portion of 150mL of methanol, stir and mix evenly;
[0078] 3. Mix the above two parts of methanol solution evenly, heat to reflux, and make it fully react; centrifuge, wash and dry the mixed solution to obtain a solid powder, which is the multi-element MOF precursor (referred to as ZnCuNiCoFe-ZIF);
[0079] 4. After heat-treating the above solid powder in an inert gas atmosphere, prepare a nitrogen-doped carbon material loaded with five single-atom sites such as ZnCuNiCoFe, (denoted as (Zn 1 Cu 1 Ni 1 co 1 Fe 1 ) / NC).
[0080] Zn will be prepared 1 Cu ...
Embodiment 2
[0090] A single-atom catalyst is a nitrogen-doped carbon skeleton loaded with Zn, Cu, Ni, Co, and Mn.
[0091] Concrete preparation method is:
[0092] 1. Mix 3.4g Zn(NO 3 ) 2 ·6H 2 O, 120mg Cu(NO 3 ) 2 ·3H 2 O, 145mg Ni(NO 3 ) 2 ·6H 2 O, 30mg Co(NO 3 ) 2 ·6H 2 O and 125mg Mn(NO 3 ) 2 4H 2 O was dissolved in 150mL methanol, stirred and mixed evenly;
[0093] 2. Dissolve 3.94g of dimethylimidazole in another portion of 150mL of methanol, stir and mix evenly;
[0094] 3. Mix the above two methanol solutions evenly, heat to reflux, and make them fully react; centrifuge, wash, and dry the mixed solution to obtain a solid powder that is the multi-element MOF precursor (referred to as ZnCuNiCoMn-ZIF);
[0095] 4. Prepare the nitrogen-doped carbon material (denoted as (Zn 1 Cu 1 Ni 1 co 1 mn 1 ) / NC).
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