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

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Problems solved by technology

The porous carbon materials prepared by these methods are usually powder-based

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

Example Embodiment

[0031] Example 1: Try preparation process

[0032] The first step: the preparation of the melamine resin prepolymer. 10.8 g of melamine and 23.4 g of aqueous formaldehyde (37 wt%) were placed in a 250 ml of three flasks, and stirred, 60 ml of 0.05 mol / L aqueous sodium hydroxide solution was added, and then heated to 65 ° C for 0.5 h, reacted, naturally drown to room temperature , A melamine resin prepolymer solution is obtained, and it is available.

[0033] Step 2: The drip method is wrapped. The sodium of 2.08 g of alginate was weighed into the beaker, and 140 g of water was stirred. When the alginate dissolved completely formed a sol, 19.2 g of citrate was added, continued to stir well, forming a milky, opaque viscous liquid, and then Wherein, the melamine resin prepolymer solution obtained is added, and after mixing, the mixture is added to 200 g of 4 wt% nitrate aqueous solution of calcium nitrate, and the nitrate solution is not stirred during the drop, the droplets and ca...

Example Embodiment

[0036] Example 2: Table area and pore structural properties of carbon materials

[0037] The specific surface area and the structural properties of the carbon material SNMC are shown in Table 1. In contrast, we used the same method to test the specific surface area of ​​the commercial coconut shell carbon (recorded CSC), and the results are listed in Table 1. As shown in Table 1, with the increase of the calcination temperature, the specific surface area of ​​the carbon material SNMC presents first increase, and the surface area is the highest than the surface area at 800 ° C, reaches 977m. 2 / g. The change trend of Confucius is the same as the specific surface area, and is also the highest at 800 ° C, reaching 0.85cm. 3 / g. The average pore size and the most specific aperture are not obvious, and it is maintained between 3.5 to 3.8 nm and 3.3-3.6 nm, respectively. Nitrogen / carbon atoms gradually decrease with the increase of the calcination temperature, because the higher the...

Example Embodiment

[0040] Example 3: Surface chemical properties of carbon materials

[0041] Carbon material SNMC-800 XPS spectrum figure 2 Indicated. By attachment figure 2 It can be seen that a nitrogen atom and an oxygen atom have been successfully introduced on the SNMC of the carbon material, in which the content of the nitrogen atom reaches 6.4% (N / C is about 0.08), and the content of oxygen atoms reaches 13.7% (O / C is about 0.17. ). All nitrogen and oxygen atoms are an anchored atom, which can be used as an anchor positioning point of precious metals, which is conducive to improving the dispersibility and stability of precious 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
CPCB01J27/24B01J35/1004C01B32/00
Inventor 王辉沈俭一崔化鹏
Owner YANCHENG TONGHAI BIOTECH CO LTD
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