Cu nanocrystallines and topological and chemical reduction method for preparing Cu nanocrystalline catalyst with different morphologies

Abstract

The invention provides Cu nanocrystallines and a topological and chemical reduction method for preparing a Cu nanocrystalline catalyst with different morphologies. According to the method, Cu2O nanocrystallines with different morphologies are adopted as precursors and are subjected to topological reduction under the reducing atmosphere of CO or H2 or CO+H2O or the like to obtain the corresponding Cu nanocrystallines. The specific preparation method includes the first step of synthesizing the Cu2O nanocrystallines with the three different morphologies of cubes, octahedrons and dodecahedrons, the second step of conducting protective agent removal treatment on the corresponding octahedrons with protective agents and the corresponding dodecahedrons with protective agents, and the third step of conducting constant-temperature reduction at a fixed temperature under the reducing atmosphere containing 1%-10% of CO / Ar or 1%-10% of H2 / Ar or 1%-10% of CO plus 5%-15% of H2O / Ar or the like for one to two hours, cooling down naturally to the indoor temperature, and then obtaining the Cu nanocrystallines which keep the corresponding morphologies. The obtained Cu nanocrystalline catalyst is applied to a water gas shift reaction, an obvious catalytic activity difference is shown, and the Cu nanocrystalline catalyst has good application space.

Description

technical field [0001] The invention belongs to the field of nanomaterials, in particular to nanomaterials with different shapes and a preparation method thereof, in particular to Cu with different shapes. 2 O nanocrystals are used as a precursor to topologically reduce Cu nanocrystals with different morphologies in a reducing atmosphere and their preparation methods. Specifically, they are a preparation method that can be applied to water vapor shift reactions for Cu nanocrystals with different morphologies. Background technique [0002] As a cheap metal material, Cu has a wide range of applications in catalytic reactions. It is widely used in hydrogenation processes in industry, including methanol synthesis and water vapor shift reactions. It occupies an extremely important role in chemistry, chemical industry, and energy production. Important position. [0003] At present, in scientific research, it is very difficult to synthesize Cu nanocrystals with regular morphology....

AI Technical Summary

Problems solved by technology

At present, the low-temperature catalyst for water vapor shift reaction in industry is Cu / ZnO / Al 2 o 3 catalyst, but in Cu / ZnO / Al 2 o 3 There are some disputes about the role of each component in the catalyst. At present, the generally accepted result is that Cu is the catalytic center of the water vapor shift reaction. Therefore, it is of great significance to study the properties of Cu reasonably.

At present, there is no Cu with different morphology in the prior art. 2 O nanocrystals used as precursors to form Cu nanocrystals with different morphologies and their preparation methods by topological reduction under reducing atmosphere

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