A kind of preparation method of nano platinum oxide powder

Abstract

The invention belongs to the technical field of catalysis, and specifically relates to a preparation method of nano-platinum oxide powder, comprising the following steps: Step 1, adding platinum chloride into distilled water and stirring until completely dissolved, then slowly adding alkali solution dropwise until the precipitation is no longer produced, filtered and washed to obtain a platinum hydroxide precipitate; step 2, put the platinum hydroxide precipitate in absolute ethanol and stir to disperse evenly, then add crown ether and stir until completely dissolved to obtain a mixed ethanol solution; step 3, mix the mixed ethanol solution Stand at constant temperature for 2-5h, then gradient step-down and stand for 4-8h, and filter to obtain crystals; step 4, put the crystals into a ball milling device for constant temperature ball milling reaction for 1-2h, to obtain crystal fine powder; step 5, fine crystal powder The powder is added to the electrolyte solution for electrolysis for 2-4 hours, and the precipitate is obtained after filtration; in step 6, the precipitate is ultrasonically washed in absolute ethanol for 30-40 minutes, filtered and dried to obtain nano-platinum oxide powder. The invention utilizes double passivation to ensure the nanostructure of platinum oxide without agglomeration.

Description

technical field [0001] The invention belongs to the technical field of catalysis, and in particular relates to a preparation method of nanometer platinum oxide powder. Background technique [0002] Platinum dioxide (PtO 2 ) The well-known heterogeneous Adams catalyst has the advantages of excellent catalytic performance, high activity, high selectivity, long service life and recyclability. Adams catalyst has always played an important role in hydrogenation catalytic reactions. It can hydrogenate various groups and is commonly used Hydrogenation or hydrogenolysis of ethylenic bond, hydroxyl group, aldehyde group, imine group, aromatic nitro group and aromatic ring. [0003] In 1922, Adams prepared a platinum oxide solid catalyst by reacting chloroplatinic acid and sodium nitrate at 450°C. In 1999, Reetz et al. used a quaternary ammonium salt surfactant as a stabilizer to convert PtCl 4 Hydrolyzed alkaline solution at 50°C for 7 days to prepare water-soluble platinum oxide n...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention provides a method for preparing nano-platinum oxide powder, which solves the problem that platinum oxide is easy to agglomerate in the existing process, and uses electrolysis and ultrasound to passivate platinum hydroxide and platinum oxide respectively. , using double passivation to ensure the nanostructure of platinum oxide without agglomeration

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