Preparation method of carbon nitride supported monoatomic metal catalysis material

A technology of metal catalysis and carbon nitride, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as easy agglomeration and catalyst deactivation, and achieve inhibition of agglomeration and good dispersion , Improve the effect of stability and dispersion

Active Publication Date: 2017-07-14
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When metal single atoms are easily agglomerated during the preparation and reaction process, resulting in catalyst deactivation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Disperse 2 g of melamine in 100 mL of N,N-dimethylformamide and stir at room temperature for 3 h to obtain a melamine solution. Disperse 10 mg of palladium nitrate in 10 mL of N,N-dimethylformamide, and ultrasonicate for 30 min to obtain a palladium nitrate solution. Transfer the melamine solution to a 250mL round-bottomed flask, then add 5mL palladium nitrate solution into the melamine solution, configure a condensation reflux tube, heat to 120°C under nitrogen protection, stir for 36 hours in the dark, and then naturally cool to room temperature. The solvent was removed from the mixed solution by rotary evaporation to obtain a solid metal carbon-nitrogen adduct, which was dried in vacuum for 24 hours and then ground to 80 mesh. Put the solid powder in a ceramic crucible, put it into a tube furnace, and heat it under the condition of nitrogen protection. First, heat to 300°C at a rate of 2°C / min and keep for 2h, then heat to 500°C at a rate of 7°C / min and keep for 2h....

Embodiment 2

[0019] Disperse 2 g of melamine in 100 mL of N,N-dimethylformamide and stir at room temperature for 3 h to obtain a melamine solution. Disperse 10 mg of platinum nitrate in 10 mL of N,N-dimethylformamide, and ultrasonicate for 30 min to obtain a platinum nitrate solution. Transfer the melamine solution to a 250mL round-bottomed flask, then add 5mL of platinum nitrate solution into the melamine solution, configure a condensation reflux tube, heat to 120°C under nitrogen protection, stir for 24 hours in the dark, and then naturally cool to room temperature. The solvent was removed from the mixed solution by rotary evaporation to obtain a solid metal carbon-nitrogen adduct, which was dried in vacuum for 24 hours and then ground to 80 mesh. Put the solid powder in a ceramic crucible, put it into a tube furnace, and heat it under the condition of nitrogen protection. First, heat to 300°C at a rate of 2°C / min and keep for 2h, then heat to 550°C at a rate of 5°C / min and keep for 4h....

Embodiment 3

[0021] Disperse 2 g of melamine in 100 mL of methanol and stir at room temperature for 3 h to obtain a melamine solution. Disperse 20mg of silver nitrate in 10mL of methanol and ultrasonically treat it for 30min to obtain a silver nitrate solution. Transfer the melamine solution to a 250mL round-bottomed flask, then add the silver nitrate solution to the melamine solution, configure a condensation reflux tube, heat to 60°C under nitrogen protection, stir for 24 hours in the dark, and then cool naturally to room temperature. The solvent was removed from the mixed solution by rotary evaporation to obtain a solid metal carbon-nitrogen adduct, which was dried in vacuum for 24 hours and then ground to 80 mesh. Put the solid powder in a ceramic crucible, put it into a tube furnace, and heat it under the condition of nitrogen protection. First, heat to 200°C at a speed of 1°C / min and keep for 2h, then heat to 450°C at a speed of 5°C / min and keep for 2h. Cool down to room temperatur...

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PUM

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Abstract

The invention mainly relates to a preparation method of a carbon nitride supported monoatomic metal catalysis material, concretely relates to a preparation method of a layered graphite phase carbon nitride supported monatomic metal M catalysis material (M is one or two or more of Ag, Pd, Rh and Pt), and belongs to the field of catalysis materials. The carbon nitride supported monoatomic metal catalysis material is prepared through one-step pyrolysis of a carbon and hydrogen precursor and a metal precursor in a carbon and hydrogen precursor and metal precursor complexing manner through using the inhibition of the aggregation of metal atoms by the interaction of a metal center and a ligand, so the stability and the dispersibility of the monatomic metal catalysis material are improved. The metal in the material prepared through the method is supported on the surface of layered graphite phase carbon nitride in a zero-valence monoatomic dispersion form, and the kind and composition of supported metal atoms can be controlled as needed.

Description

technical field [0001] The present invention mainly relates to a preparation method of a carbon nitride-supported single-atom metal catalytic material, specifically a layered graphite-phase carbon nitride-supported single-atom metal M catalytic material (M is one of Ag, Pd, Rh, and Pt). One or two or more) of the preparation method belongs to the field of catalytic materials. [0002] Background technique: [0003] Single-atom catalysis is of great significance for the practical application of catalysts (X. Yang, A. Wang, B. Qiao, J. Li, J. Liu, T. Zhang. Accounts of Chemical Research, 2013, 46, 1740-1748.) . 50% of the world's annual platinum production is used in the three-way converter of the automobile exhaust purification system. Electrode catalysts for fuel cells, selective hydrogenation of catalytic reforming in petrochemical industry, and the synthesis of various fine chemicals all rely heavily on efficient supported noble metal catalysts such as platinum and pallad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24
CPCB01J27/24
Inventor 卞兆勇王辉
Owner BEIJING NORMAL UNIVERSITY
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