Preparation method of nitrogen-doped graphite sieve tube loaded with metal nanoparticles

Abstract

The invention discloses a preparation method of a nitrogen-doped graphite sieve tube loaded with metal nanoparticles. The preparation method comprises the following steps: adding metal salt into a solution system containing tris hydroxyl methyl aminomethan, fiber and dopamine hydrochloride simultaneously to obtain a mixed solution, then stirring to form polydopamine coating the fiber, and simultaneously loading metal nanoparticles; then, carrying out thermal annealing treatment under the atmosphere of inert gas; and finally using a hydrofluoric acid solution to remove fiber so as to obtain a nitrogen-doped graphite sieve tube / metal (alloy) nanoparticle composite material. By setting the whole technological process and improving each critical processing step, the problem that a loaded typemetal catalyst preparation is complex in technology and rigorous in pore-forming conditions can be solved effectively.

Description

technical field [0001] The invention belongs to the field of new catalytic materials, and more specifically, relates to a method for preparing a nitrogen-doped graphite screen loaded with metal nanoparticles. Particles, various magnetic metal alloy nanoparticles, or nitrogen-doped graphite sieve tubes of magnetic metal-noble metal alloy nanoparticles. Background technique [0002] Supported heterogeneous catalysts have been widely used in catalytic fields such as energy, environment, and organic synthesis, and play an indispensable role in these industrial processes. In general, supported heterogeneous catalysts consist of a support and an active component (supported metal). Therefore, its catalytic performance is closely related to the properties of the support and the microscopic morphology of the supported active metals. How to load active metals on supports with excellent physicochemical properties and expose the active sites to exert their maximum catalytic performanc...

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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for preparing a nitrogen-doped graphite screen catalyst material of negative metal nanoparticles, wherein the overall process flow of the preparation method is set, and each key The reaction conditions and parameters (such as the type and proportion of reaction raw materials, reactant concentration and reaction temperature, etc.) Compared with the technology, it can effectively solve the problems of complex preparation process and harsh pore-forming conditions of supported nano-metal catalysts. The preparation method has simple process, convenient operation, cheap and easy-to-obtain reaction materials, and can effectively reduce the preparation cost of supported catalysts; The present invention can use magnetic metal salt (such as iron salt) raw materials to form magnetic metal nanoparticles (such as iron nanoparticles), and then use magnetic metal (such as Fe) to catalyze the graphitization of polydopamine under high-temperature annealing conditions, and in-situ etch carbon micron Tubes, thus forming nitrogen-doped graphite microtubes with porous walls, have the characteristics of high specific surface area; at the same time, magnetic metal nanoparticles (such as iron nanoparticles) can also form magnetic metal- Noble metal alloys (such as Fe-noble metal alloys), which can further improve the catalytic performance of the material

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