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Preparation method and applications of nitrogen-doped copper-palladium bimetal nanometer catalytic material

A technology of bimetallic nano and catalytic materials, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as poor stability and poor dispersion, achieve high stability, improve dispersion, Good dispersion and stability effect

Inactive Publication Date: 2019-11-19
江西夏氏春秋环境股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the shortcomings of poor dispersibility and poor stability currently used in denitrification catalysts, the present invention is proposed

Method used

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  • Preparation method and applications of nitrogen-doped copper-palladium bimetal nanometer catalytic material
  • Preparation method and applications of nitrogen-doped copper-palladium bimetal nanometer catalytic material
  • Preparation method and applications of nitrogen-doped copper-palladium bimetal nanometer catalytic material

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Effect test

Embodiment 1

[0027] 1. The preparation of nitrogen-doped copper-palladium bimetallic nanocatalytic materials, the specific steps are as follows:

[0028] (1) Put copper nitrate (1.5mol) and palladium acetylacetonate (0.38mol) in 1.5mL N,N-dimethylformamide (DMF), mix well to form a uniform dispersion system, in this uniform dispersion system Add the organic ligand triethylenediamine (nitrogen source, 4.58mol) and terephthalic acid (4.35mol) for hydrothermal reaction, mix and stir for about 30min, move to the hydrothermal reactor and react at 150°C for 12h to prepare N-Cu-PdMOFs were obtained.

[0029] (2) Add the N-Cu-PdMOFs and OMC (150mg) prepared in step (1) into DMF and sonicate for about 30min, then move the mixture to a hydrothermal reactor for 16h at 180°C; wash the obtained product, After centrifugation, place at 140°C for vacuum drying for 6 hours;

[0030] (3) After the product obtained in step (2) was pyrolyzed at 600 °C for 2 h in a tube furnace in an argon (90 mL / min) atmosp...

Embodiment 2

[0041] The preparation of nitrogen-doped copper-palladium bimetallic nanocatalytic material and the method of catalytic reduction of nitrate are as in Example 1, the difference is that the mass ratio of copper-palladium is controlled when preparing nitrogen-doped space-confined N-Cu-Pd@OMC The ratio is 2:1, the high temperature pyrolysis time is 1h under nitrogen atmosphere, and after 24h of electrocatalytic reaction, the nitrogen selectivity is 84%, and the nitrate removal capacity is 493.6mgN / g catalyst.

Embodiment 3

[0043] The preparation of nitrogen-doped copper-palladium bimetallic nanocatalytic material and the method of catalytic reduction of nitrate are as in Example 1, the difference is that the calcination temperature adopted when preparing nitrogen-doped space-confined N-Cu-Pd@OMC catalyst is 800°C, the nitrate concentration of this system is 200ml, the coating amount of nano-catalyst material is 5mg, the area of ​​nickel mesh is 2cm×2.5cm, after electrocatalytic reaction for 30h, the selectivity of nitrogen is 86%, and the removal capacity of nitrate It is 1273.6mgN / g catalyst.

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Abstract

The invention provides a preparation method and applications of a nitrogen-doped copper-palladium bimetal nanometer catalytic material (N-Cu-Pd@OMC). The specific steps comprise: sequentially adding an organic ligands triethylenediamine and terephthalic acid to main active elements copper and palladium, and preparing a copper-palladium metal organic framework (N-Cu-PdMOFs) by using a hydrothermalself-assembly method; mixing MOFs and mesoporous carbon (OMC), and carrying out a hydrothermal reaction to obtain a powder material; and placing the powder material in a tubular furnace, and calciningto obtain a nanometer catalytic material. According to the present invention, the copper-palladium nanoparticles (3-9 nm) in the catalytic material are confined in the mesoporous channels of OMC, such that the active component has good dispersion property and good stability; the working electrode prepared from the nanometer catalytic material shows good denitrification performance in the environmental field, the nitrate removal rate can reach 74-91%, and the nitrogen selectivity is 81-94%; and the product is an efficient nanometer catalyst having application prospects and suitable for large-scale industrialization.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and in particular relates to a preparation method and application of a nitrogen-doped copper-palladium bimetallic nanocatalytic material. Background technique [0002] The eutrophication of water caused by nitrogen and phosphorus is one of the most severe environmental challenges facing our country, among which nitrate has become one of the most challenging water pollutants due to its unlimited solubility and stability. In recent years, with the rapid development of high-efficiency nanocatalysis technology and renewable energy, electrocatalytic nitrate reduction to harmless nitrogen is rapidly developing into a promising denitrification technology that can replace traditional biological methods. A large number of literatures have reported that copper-palladium nanomaterials have high catalytic activity and nitrogen selectivity, and the catalytic activity and selectivity of the ca...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10C02F1/461C02F1/467C02F1/70C02F101/16
CPCB01J27/24C02F1/46109C02F1/4676C02F1/70C02F2001/46133C02F2101/163B01J35/394B01J35/33
Inventor 王晶王伟张伟贤
Owner 江西夏氏春秋环境股份有限公司
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