Co@NCNT material prepared by reduction-oxidation-reduction strategy and preparation method of Co@NCNT material

Abstract

The invention discloses a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method of the Co@NCNT material. The preparation method comprises the following steps: (1) preparing a ZIF-67 material from Co salt and a dimethylimidazole ligand; (2) performing pyrolysis in an inert atmosphere or a reducing atmosphere to obtain Co@C@NCNT in which the surfaces of Co nanoparticles are covered with carbon films; (3) conducting oxidizing in an oxidizing atmosphere, and removing a carbon film at the top end to obtain Co3O4@NCNT; and (4) reducing Co3O4@NCNT in a reducing atmosphere to obtain the Co@NCNT. Compared with Co@C@NCNT, the top ends of the Co nanoparticles in the Co@NCNT are not coated with the carbon films, full contact with reactant molecules is realized, more active sites are exposed, and a carbon carrier and the Co nanoparticles can respectively present solid, shell-core and hollow structures according to different preparation conditions, so the catalytic reaction selectivity and activity of the Co@NCNT are influenced, and the Co@NCNT has potential application prospects.

Description

technical field

[0001] The invention belongs to the field of porous materials, and in particular relates to a Co@NCNT material prepared by a reduction-oxidation-reduction strategy and a preparation method thereof. Background technique

[0002] Fischer-Tropsch synthesis (FTS) can convert synthesis gas (CO, H 2 ), converted into hydrocarbons with a wide carbon number distribution, which has a wide range of raw materials and high added value of products, which can alleviate the urgent demand for fossil energy today. Co-based catalysts commonly used in FTS have received extensive attention because of their strong catalytic activity, weak water-gas conversion activity, and low carbon deposition. Combine Co with a carrier (such as TiO 2 , C, etc.) can change the electronic environment of Co, improve the dispersion of Co, prevent the sintering of the reaction process, and optimize the reaction activity, selectivity and stability. However, the Co content of traditional supported ...

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