A kind of method for selectively oxidizing alcohol under mild conditions to prepare aldehyde/ketone

Abstract

The present invention provides a method for selectively oxidizing alcohols to prepare aldehydes / ketones under mild conditions. Mainly using rhodium-doped strontium titanate as the semiconductor substrate, and photo-depositing platinum nanoparticles to obtain Pt / Rh‑SrTiO 3 Heteronodal structures as photocatalysts. This photocatalyst uses water as the reaction medium and oxidant in an oxygen-free environment and visible light catalytic conditions. It can oxidize hydroxyl groups in alcohol molecules with high efficiency and selectivity to obtain aldehydes / ketones, and at the same time generate stoichiometric amounts of hydrogen. Compared with other traditional thermal catalytic alcohol oxidation methods, this method has the advantages of high efficiency, good selectivity, environmental friendliness, and mild conditions. It can oxidize alcohol hydroxyl groups to ketone carbonyl groups in water medium at room temperature and pressure with high efficiency, which is a photocatalytic synthesis of solar energy. Successful examples of extending catalysis in the fuel field to heterogeneous catalytic conversion of organic molecules.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, in particular, the invention relates to a method for selectively oxidizing alcohols to prepare aldehydes / ketones under mild conditions. Background technique [0002] The synthesis of aldehydes and ketones by selective oxidation of alcohols is a major reaction in organic synthesis and industrial chemistry. [1-3] However, the traditional thermocatalytic oxidation method not only requires harsh reaction conditions, but also the use of corrosive reagents and toxic metal catalysts leads to by-products and difficulties in product purification and post-processing. Developing environmentally friendly reaction pathways under mild reaction conditions for the highly selective oxidation of alcohols, especially for the oxidation of primary alcohols to aldehydes rather than acids due to excessive conversion, has been a great challenge in the field of heterogeneous catalysis. [4] So far, researchers ha...

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Problems solved by technology

[23] However, due to the influence of self-corrosion, cadmium sulfide semiconductors usually have serious performance degradation.

[0004] Considering that in the research of hydrogen production using photocatalytic water splitting half-reaction, alcohols are usually used as sacrificial agents to be over-oxidized to acids or even carbon dioxide, etc., and most of the studies have stable and selective oxidation of alcohols to obtain aldehydes / ketones The photocatalytic hydrogen production system under visible light that simultaneously produces hydrogen, a solar fuel, has not been reported.

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