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Preparation method of formed nitrogen-containing mesoporous carbon material

A technology of mesoporous carbon and preparation process, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as limiting the application scope of porous carbon materials

Pending Publication Date: 2021-06-08
YANCHENG TONGHAI BIOTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous carbon materials prepared by these methods are usually powder-based, which limits the application range of porous carbon materials to some extent.

Method used

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  • Preparation method of formed nitrogen-containing mesoporous carbon material
  • Preparation method of formed nitrogen-containing mesoporous carbon material
  • Preparation method of formed nitrogen-containing mesoporous carbon material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: Small-scale test preparation process

[0032] The first step: the preparation of melamine resin prepolymer. Put 10.8g of melamine and 23.4g of formaldehyde aqueous solution (37wt%) in a 250mL three-necked flask, start stirring, add 60mL of 0.05mol / L sodium hydroxide aqueous solution, and then heat to 65°C for 0.5h. After the reaction is complete, naturally cool down to room temperature , to prepare a melamine resin prepolymer solution for use.

[0033] The second step: the drop ball method wrapping molding. Weigh 2.08g of sodium alginate and put it into a beaker, add 140g of water and stir, when the sodium alginate dissolves completely to form a sol, add 19.2g of magnesium citrate, continue to stir evenly, forming a milky white, opaque viscous liquid, and then add Wherein add the melamine resin prepolymer solution that the first step makes, after mixing uniformly, mixed solution is dripped in the 200g 4wt% calcium nitrate aqueous solution by syringe, and...

Embodiment 2

[0036] Example 2: Specific surface area and pore structure properties of carbon materials

[0037] The specific surface area and pore structure properties of the carbon material SNMC are shown in Table 1. As a comparison, we used the same method to test information such as the specific surface area of ​​commercially available coconut shell carbon (referred to as CSC), and the results are listed in Table 1. As shown in Table 1, with the increase of calcination temperature, the specific surface area of ​​carbon material SNMC showed a trend of first increasing and then decreasing, and the specific surface area was the highest at 800 °C, reaching 977m 2 / g. The change trend of the pore volume is the same as that of the specific surface area, and it is also the highest at 800 °C, reaching 0.85 cm 3 / g. The average pore diameter and the most probable pore diameter are not significantly affected by the calcination temperature, and they remain between 3.5-3.8nm and 3.3-3.6nm, respe...

Embodiment 3

[0040] Example 3: Surface chemistry of carbon materials

[0041] The XPS spectrum of the carbon material SNMC-800 is attached figure 2 shown. attached by figure 2 It can be seen that nitrogen atoms and oxygen atoms have been successfully introduced into the carbon material SNMC, wherein the content of nitrogen atoms reaches 6.4% (N / C is about 0.08), and the content of oxygen atoms reaches 13.7% (O / C is about 0.17 ). Both nitrogen and oxygen atoms are electron-rich atoms, which can be used as anchor sites for noble metals, which is beneficial to improve the dispersion and stability of noble metals.

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Abstract

The invention innovatively provides a preparation method of a formed nitrogen-containing mesoporous carbon material capable of being industrially produced in a large scale. The method comprises the following steps: taking melamine resin as a carbon source and a nitrogen source and magnesium citrate as a template agent, mixing the melamine resin, the magnesium citrate and sodium alginate to form a colloidal solution by means of the gelling property of the sodium alginate, performing wrapping forming through a ball dropping method to form melamine resin gel balls with rigid shells, and performing drying, roasting at high temperature and pickling to obtain the novel formed nitrogen-containing mesoporous carbon material. Research results show that: the carbon material has a very high specific surface area, a prominent mesoporous structure and a relatively large average pore size, has abundant nitrogen atoms and oxygen atoms, also has good mechanical strength, is an excellent noble metal catalyst carrier, shows relatively good unsaturated fatty acid C=C double-bond hydrogenation activity on a fixed bed reactor, and has good market application prospects.

Description

technical field [0001] The invention relates to the field of physical chemistry, in particular to the field of preparation of catalyst supports and noble metal supported catalysts. Background technique [0002] In recent years, nitrogen-doped porous carbon materials have become a research hotspot. Nitrogen-containing porous carbon materials are often used to prepare electrodes in metal redox reactions, and are also one of the core materials of supercapacitors. More importantly, they are excellent supports for noble metal catalysts. The introduction of nitrogen atoms and rich porous structures endow improved catalytic performance of the catalyst. The doped nitrogen atoms can adjust the acidity and alkalinity of the catalyst surface, promote the generation of abundant defect sites on the surface of the carbon material, increase the electronic interaction between the metal and the support, enhance the electron transfer in the catalytic system, and improve the dispersion of the...

Claims

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Application Information

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IPC IPC(8): C01B32/00B01J27/24B01J35/10B01J32/00
CPCC01B32/00B01J27/24B01J35/61
Inventor 王辉沈俭一崔化鹏
Owner YANCHENG TONGHAI BIOTECH CO LTD
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