A kind of dendritic cu/c-cusio3 nanostructure hydrogenation catalyst preparation method

Abstract

The invention discloses a dendritic Cu / C-CuSiO 3 Nanostructured hydrogenation catalyst and preparation method thereof. This dendritic Cu / C‑CuSiO 3 The preparation process of the nanostructured hydrogenation catalyst is as follows: first, a silica coating layer is formed by hydrolyzing ethyl orthosilicate on the surface of monodispersed carbon nanotubes; then, the silica coating layer is combined with the hydrothermal condition The copper ammonia complex ion reacts to generate a copper silicate needle array outside the carbon nanotube; finally, metal nano-copper particles are loaded on the inner and outer surfaces of the material to adjust the content of metallic copper and copper silicate. Dendritic Cu / C‑CuSiO prepared by this method 3 Nanostructured hydrogenation catalysts can achieve stable coexistence and ratio adjustment of Cu(I) and Cu(0) active components in copper-based catalysts. At the same time, the tubular structure formed by the copper silicate needle array can obtain a large specific surface area and gas Flux can effectively solve the problems of deactivation caused by grain migration, sintering and unstable valence state of copper active components of copper-based catalysts during high-temperature hydrogenation reactions, improve the performance of catalytic hydrogenation reactions, and has broad application prospects.

Description

technical field [0001] The invention relates to a dendritic Cu / C-CuSiO 3 A nanostructured hydrogenation catalyst and a preparation method thereof, the catalyst has a high dispersion of copper metal, a stable morphology structure and surface Cu(I) / Cu(0) dual active components, and can be used to catalyze hydrogenation reactions. Background technique [0002] Catalytic hydrogenation is one of the most important reactions in organic reactions, and it is of great significance to industrial production applications. Copper-based catalysts have become the main catalysts used in many catalytic hydrogenation processes because of their low price and easy availability. At present, most of the copper-based catalysts used in industrial hydrogenation reactions are prepared by traditional loading methods such as impregnation method and coprecipitation method. The preparation process of simple supported catalysts tends to cause low dispersion of active components and exist in the body. pha...

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Problems solved by technology

[0005] Aiming at the problem of deactivation caused by crystal grain migration, sintering and unstable valence state of copper active components during the high-temperature hydrogenation reaction of copper-based catalysts, the present invention uses conventional oxides, silicates and other materials to develop a low-cost, The dendritic core-sheath structure copper-based catalyst is easy to operate, and the unique structure of the dendrite is coupled to the promotion of the active components of the catalyst and the synergistic effect between the components, so as to achieve the purpose of improving the reaction activity and stability

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