Preparation method of nano platinum oxide powder

Abstract

The invention belongs to the technical field of catalysis and particularly relates to a preparation method of nano platinum oxide powder. The preparation method comprises the following steps: step one, adding platinum chloride into distilled water and stirring until platinum chloride is completely dissolved; then slowly dropwise adding an alkali solution until no precipitate is produced, filteringand washing to obtain platinic hydroxide precipitate; step two, adding the platinic hydroxide precipitate into absolute ethyl alcohol for stirring and uniformly dispersing; then adding crown ether and stirring until crown ether is completely dissolved to obtain mixed ethanol liquid; step three, carrying out thermostatic standing on the mixed ethanol liquid for 2 to 5 hours, carrying out gradientdepressurization, standing for 4 to 8 hours and filtering to obtain crystal; step four, putting the crystal into a ball-milling device and carrying out constant temperature ball-milling reaction for 1to 2 hours to obtain crystal fine powder; step five, adding the crystal fine powder into electrolyte, carrying out electrolytic reaction for 2 to 4 hours and filtering to obtain precipitate; step six, putting the precipitate into absolute ethyl alcohol, carrying out ultrasonic washing for 30 to 40 minutes, filtering and drying to obtain the nano platinum oxide powder. According to the preparationmethod disclosed by the invention, a double passivation mode is utilized, so that the nano-structure of platinum oxide is ensured; in addition, the agglomeration is avoided.

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 famous 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 PtCl 4 Hydrolyzed alkaline solution at 50°C for 7 days to prepare water-soluble platinum oxide nanopowder ...

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

Images