Loaded nano-copper magnetic catalyst used for catalysis of solution of formaldehyde for preparing hydrogen and preparation method thereof

Abstract

The invention relates to a loaded nano-copper magnetic catalyst used for catalytic conversion of aqueous solution of formaldehyde for preparing hydrogen and a preparation method thereof. The method comprises the following steps of: preparing magnetic Fe3O4 from low-cost FeCl2.4H2O and FeCl3.6H2O; coating a layer of SiO2 on the surface of the Fe3O4 to prepare a magnetic Fe3O4@SiO2 catalyst carrier; dispersing the magnetic Fe3O4@SiO2 in a copper ammonia complex; and reducing the dispersed substance by using a hydrazine hydrate to obtain a Cu / Fe3O4@SiO2 magnetic catalyst having a nano-scale Cu active ingredient. High-purity hydrogen can be obtained under a room temperature condition by applying the Cu / Fe3O4@SiO2 magnetic catalyst to the catalytic reaction of the solution of formaldehyde for preparing hydrogen and the separation of the catalyst from reactants can be realized easily by adding a magnetic field outside. Simultaneously, the catalyst can be reused repeatedly.

Description

Technical field: [0001] The invention relates to a supported nano-copper magnetic catalyst used for catalytically converting formaldehyde aqueous solution to produce hydrogen and a preparation method thereof. Background technique: [0002] In some chemical processes, such as synthetic fiber, organic synthesis, dye production, paint industry, and wood processing, the formaldehyde wastewater discharged from some sections has a high formaldehyde content, usually the concentration of formaldehyde is between 0.2g / L and 4.0g / L Sometimes even as high as 10g / L or more. If these formaldehyde-containing wastewater is not treated, it will bring great pollution to the environment, so it needs to be decomposed and treated before it can be discharged. At present, the treatment of formaldehyde wastewater mostly adopts the method of adsorption or catalytic degradation, but for the wastewater with high formaldehyde concentration, the treatment cost is very high. [0003] In 1995, Millar et...

AI Technical Summary

Problems solved by technology

Recently, Bi et al. reported that formaldehyde solution could react on nano-metallic Cu catalyst to produce H 2 (Bi Y P, Lu G X. Nano-Cu catalyze hydrogen production from formaldehyde solution at room temperature. Int. J. Hydrogen Energy, 2008, 33: 2225-2232), but after the reaction of this nano-metallic Cu catalyst, its separation It is more troublesome to recycle and recycle, and it is also difficult to reuse the catalyst, which limits the application of this catalytic reaction process.

So far, it has been used to catalyze the production of H from formaldehyde solution 2 The supported nano-Cu catalyst has not been reported publicly

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