Nitrogen-doped mesoporous carbon prepared by using calcium cyanamide as well as preparation method and application of nitrogen-doped mesoporous carbon

Abstract

The invention discloses nitrogen-doped mesoporous carbon prepared by using calcium cyanamide as well as a preparation method and application of the nitrogen-doped mesoporous carbon. The preparation method concretely comprises the following steps: mixing a carbon source with the calcium cyanamide, then mechanically grinding the mixture, adding water and kneading for lumping, placing at the room temperature for 8-14 hours under the condition of ventilating, and carrying out pre-carbonizing treatment for 8-12h at 80-100 DEG C; placing the obtained pre-carbonized sample in a tube furnace, heatingup to 400-1000 DEG C under a flowing inert atmosphere, then carrying out heat preservation for 1-5h for deep carbonization treatment, and naturally cooling to obtain the nitrogen-doped mesoporous carbon having partial calcium ions on the surface. The preparation process is simple and easy to repeat, a nitrogen source does not need to be additionally added in a preparation process, and the subsequent steps of pore broadening and removing templates are omitted, so that the method is suitable for large-scale production; the obtained nitrogen-doped mesoporous carbon is used as a solid base catalyst or a catalyst carrier, and shows an excellent catalytic activity in preparation of long chain alkanes by means of condensation and hydrogenation of aldehydes and ketones.

Description

technical field [0001] The invention relates to the field of nitrogen-doped mesoporous carbon materials, in particular to a nitrogen-doped mesoporous carbon prepared by using calcium cyanamide and its preparation method and application. Background technique [0002] Various carbon materials such as activated carbon, mesoporous carbon materials, and carbon nanotubes have strong adsorption capacity, good chemical stability, good thermal stability, and adjustable surface chemical groups. They are widely used in industry, but they cannot meet the specific requirements of the catalytic field. At this time, it is necessary to modify the carbon material to make the carbon material have metal-like properties. After modification, heteroatoms such as B and N atoms can be introduced into the carbon material to form acidic or basic catalytic active centers on the surface of the carbon material to improve the catalytic activity of the carbon material. Generally, heteroatoms are introduc...

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Problems solved by technology

There is no need to add additional nitrogen source, the raw material is cheap, and the shaped mesoporous carbon with better mechanical strength can be obtained, but the template needs to be removed

[0005] Due to the reduction of fossil energy and the increasingly harsh environmental problems, the use of biomass to replace petroleum to prepare biodiesel and jet fuel is a current research hotspot. Among them, a large number of studies have used homogeneous acid-base catalysis to achieve Aldehydes and ketones are condensed and then hydrogenated to synthesize long-chain alkanes. However, the homogeneous acid-base catalysis method has a slow reaction rate and is highly corrosive to equipment. serious pollution

[0006] Xia Qineng et al. (Chemsuschem.2011,4(12):1758-1761) developed a new Pt / Co 2 AlO 4 Catalyst, at 140°C, H 2 Under the condition of pressure of 2MPa, using furfural and acetone to prepare octane diol, etc., the conversion rate of furfural can reach 99.9% after 20 hours of reaction, but Pt / Co 2 AlO 4 The preparation method of the catalyst is complicated, the application conditions are harsh, and it is not suitable for large-scale production

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