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Nitrogen-doped graded porous carbon nano catalyst and preparation method thereof

A nano-catalyst, porous carbon technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of catalyst structure collapse, limiting catalyst performance, etc.

Inactive Publication Date: 2019-09-27
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to high-temperature pyrolysis and single components, catalysts tend to suffer structural collapse during preparation, which greatly limits further improvement of catalyst performance.

Method used

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  • Nitrogen-doped graded porous carbon nano catalyst and preparation method thereof
  • Nitrogen-doped graded porous carbon nano catalyst and preparation method thereof
  • Nitrogen-doped graded porous carbon nano catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dissolve 10.6 g of 2-methylimidazole and 0.5 mL of formaldehyde in 150 mL of deionized water, and stir for 15 min.

[0031] (2) Then 0.5g of Co(NO 3 ) 2 ·6H 2 O, 0.1g of Zn(NO 3 ) 2 ·6H 2 O and 0.3 g of 4-aminophenol were dissolved in 75 mL of solution (the ratio of deionized water to ethanol was 2:1), added to the solution in step 1, and stirred at room temperature for 12 h.

[0032] (3) Collect the brown precipitate by centrifugation at 2000r / min, centrifuge for 5min, and wash repeatedly with deionized water and ethanol, respectively, for 3 times. After drying, the composite ZIF-67 / 8@AF was obtained.

[0033] (4) Carry out high-temperature carbonization in a nitrogen atmosphere at 900 ° C, and carry out acid treatment, and finally obtain NDHC-9.

[0034] figure 1 It is the scanning electron microscope image of NDHC-9. It can be seen from the figure that after pyrolysis and acid treatment at 900°C, NDHC-9 maintains the dodecahedral structure and produces a ...

Embodiment 2

[0038]This embodiment is basically the same as Embodiment 1, the only difference is that the carbonization temperature is 700°C. Catalytic properties such as Figure 4 shown.

Embodiment 3

[0040] This embodiment is basically the same as Embodiment 1, the only difference is that the carbonization temperature is 800°C. Catalytic properties such as Figure 4 shown.

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Abstract

The invention discloses a nitrogen-doped graded porous carbon nano catalyst and a preparation method thereof. According to the method, a phenolic resin assisting strategy is adopted, a zeolite imidazole ester framework structure material is converted into nitrogen-doped graded porous carbon, and the nitrogen-doped graded porous carbon is applied to the advanced oxidation process. Through the coordination of the nucleation / growth rate and polymerization rate of a precursor, ZIF-67 / 8@PR composite carbon is obtained. The introduction of a phenolic resin polymer can prevent the agglomeration of cobalt and zinc nanoparticles, an evenly distributed graded porous structure is formed, and structural collapse during carbonization is prevented. The carbonized acid treatment can remove metal particles in NDHC, and the nitrogen-doped graded porous carbon is obtained. The nitrogen-doped graded porous carbon nano catalyst can effectively avoid secondary pollution caused by metal ions leached in the catalytic process, and has excellent AOPs catalytic performance.

Description

technical field [0001] The invention relates to a nitrogen-doped grade porous carbon nanocatalyst derived from phenolic / resin assisted MOFs for advanced oxidation and a preparation method thereof, belonging to the technical field of water treatment materials. Background technique [0002] Advanced oxidation technologies (AOPs) include Fenton reaction, photocatalysis, catalytic ozone oxidation and sulfate radical (SO 4 ·— ) Oxidation is a powerful means to deal with refractory organic matter. Among the oxygen active species produced, sulfate radicals (SO 4 ·— ) and hydroxyl radicals (·OH) play a major role in the degradation process. Compared with OH, SO 4 ·— It has a higher redox potential (2.5-3.1V), a larger pH range (2.0-8.0) and a longer half-life (30-40μs), which makes SO 4 ·— Ideal for decomposing refractory organic matter. Studies have shown that transition metals (Fe, Ni, Co and Mn) and transition metal oxides (CoFe 2 o 4 , CuFe 2 o 4 , MnO 2 and Co 3 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/72C02F101/34C02F101/30
CPCB01J27/24C02F1/722C02F1/725C02F2101/345C02F2101/40B01J35/60
Inventor 李健生肖承铭张明罗瑞王超海晏鑫陈赛赛王宏宇李苗青孙秀云沈锦优韩卫清王连军
Owner NANJING UNIV OF SCI & TECH
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