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Carbon-based double-confinement interface loaded monatomic catalyst and preparation method thereof

A catalyst and confinement technology, applied in the field of single-atom catalysts and their preparation, can solve the problems of low content and limited application scope, and achieve the effects of strengthening physical confinement, convenient operation and increasing metal loading.

Pending Publication Date: 2020-09-15
ZHUHAI FUDAN INNOVATION INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal loading of this catalyst is only 0.3wt.%, which is low, which limits its application range.

Method used

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  • Carbon-based double-confinement interface loaded monatomic catalyst and preparation method thereof
  • Carbon-based double-confinement interface loaded monatomic catalyst and preparation method thereof
  • Carbon-based double-confinement interface loaded monatomic catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Synthesis of Pd1 / NC-RGO-CN single-atom catalyst:

[0036] (1) Synthesis of PDA-RGO-PDA composite material: 5 mL (10 mg / mL) of GO dispersion was added to 100 mL of tris (15 mM) solution to obtain a dispersion, and then hydrochloric acid was added Dopamine 300 mg, stirred and reacted for 6 hours, the dopamine hydrochloride was polymerized to form polydopamine and wrapped on the GO sheet to obtain the PDA-RGO-PDA composite material;

[0037] (2) Synthesis of NC-RGO-CN composite material: the PDA-RGO-PDA composite material obtained in the step (2) was annealed at 700°C for 3 hours under the protection of an inert gas atmosphere, Obtain NC-RGO-CN composite material;

[0038] (3) Synthesis of Pd1 / NC-RGO-CN single-atom catalyst: Disperse 50 mg NC-RGO-CN composite material in 100 mL deionized water to obtain NC-RGO-CN aqueous dispersion, and then, in an ice bath (0 ℃) environment with 2.0 mg metal salt precursor K 2 PdCl 4 Added into the solution, stirred and reacted for 2 ...

Embodiment 2

[0041] Synthesis of Pd1 / NC-RGO-CN single-atom catalyst:

[0042] (1) Synthesis of PDA-RGO-PDA composite material: 10 mL (5 mg / mL) of GO dispersion was added to 100 mL of tris (20 mM) solution to obtain a dispersion, and then hydrochloric acid was added Dopamine 250 mg, stirred and reacted for 10 hours, the dopamine hydrochloride was polymerized to form polydopamine and wrapped on the GO sheet to obtain the PDA-RGO-PDA composite material;

[0043] (2) Synthesis of NC-RGO-CN composite material: the PDA-RGO-PDA composite material obtained in the step (2) was annealed at 900°C for 0.5 hours under the protection of an inert gas atmosphere, Obtain NC-RGO-CN composite material;

[0044] (3) Synthesis of Pd1 / NC-RGO-CN single-atom catalyst: Disperse 50 mg NC-RGO-CN composite material in 100 mL deionized water to obtain NC-RGO-CN aqueous dispersion, and then, in an ice bath (0 ℃) with 1.5 mg metal salt precursor K 2 PdCl 4 Added to the solution, stirred and reacted for 3 hours, suct...

Embodiment 3

[0046] (1) Synthesis of PDA-RGO-PDA composite material: Add 7 mL (7.2 mg / mL) of GO dispersion to 100 mL of tris (12 mM) solution to obtain a dispersion, and then add hydrochloric acid Dopamine 250 mg, stirred and reacted for 12 hours, the dopamine hydrochloride was polymerized to form polydopamine and wrapped on the GO sheet to obtain the PDA-RGO-PDA composite material;

[0047] (2) Synthesis of NC-RGO-CN composite material: the PDA-RGO-PDA composite material obtained in the step (2) was annealed at 500°C for 3 hours under the protection of an atmosphere of an inert gas, Obtain NC-RGO-CN composite material;

[0048] (3) Synthesis of Pd1 / NC-RGO-CN single-atom catalyst: Disperse 50 mg NC-RGO-CN composite material in 100 mL deionized water to obtain NC-RGO-CN aqueous dispersion, then, in an ice bath (2 ℃) environment with 0.8 mg metal salt precursor K 2 PdCl 4 Added to the solution, stirred and reacted for 2.5 hours, suction filtered, and freeze-dried to obtain the Pd1 / NC-RGO-...

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Abstract

The invention belongs to the technical field of catalysts, and particularly relates to a carbon-based double-confinement interface loaded monatomic catalyst and a preparation method thereof. The preparation method comprises the following steps: synthesizing a PDA-GO-PDA composite material in which graphene oxide (GO) is coated with polydopamine (PDA); synthesizing an NC-RGO-CN double-confinement interface composite material in which reduced graphene oxide (RGO) is coated with nitrogen-doped carbon (NC); and synthesizing the M1 / NC-RGO-CN double-confinement interface monatomic catalyst of the NC-RGO-CN double-confinement interface composite material loaded with the metal monatomic (M1). By improving the whole process flow and the reaction conditions and parameters of each key process step, the dispersity, the catalyst activity and the cycling stability of metal single atoms can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a single-atom catalyst and a preparation method thereof. Background technique [0002] The metal in the single-atom catalyst exists in the form of a single atom, so it has excellent catalytic activity and exhibits the maximum atomic efficiency[Confined-interface-directed synthesis of Palladium single-atomcatalysts on graphene / amorphous carbon. Appl. Catal. B - Environ. 2018, 225,291-297.]. In recent years, single-atom catalysts have been widely studied in the field of heterogeneous catalysis, and have been applied in many fields such as photocatalysis, electrocatalysis, and organocatalysis [Supported Noble-Metal Single Atoms for Heterogeneous Catalysis. Adv. Mater. 2019, 1902031] . However, it is difficult for single atoms to exist stably, especially when the loading is high, it is easy to agglomerate into nanoparticles. Therefore, the preparation of stable and h...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/00B01J35/02B01J37/08
CPCB01J27/24B01J37/082B01J35/391B01J35/00B01J35/30
Inventor 王帅奚江波池凯
Owner ZHUHAI FUDAN INNOVATION INST
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