A kind of platinum-gallium composite nano catalyst and preparation method thereof

Abstract

The invention discloses a preparation method of a platinum-gallium composite nanocatalyst, which includes the following steps: S1. Dissolve platinum acetylacetonate and gallium acetylacetonate in an alcohol solvent and mix them evenly to prepare a mixed solution; S2. Dissolve the alcohol solvent Add it to the reactor, and heat the alcohol solvent under the protection of inert gas; S3. Add the catalyst carrier to the reactor in advance, and add the mixed solution to the reactor through hot injection method, and the reaction will obtain a reaction liquid ; S4. The reaction solution is reacted at a higher temperature for a period of time in advance, and then the reaction solution is heated in a water bath and stirred. After stirring, the reaction solution is centrifuged, dried, and roasted in order to obtain a platinum-gallium composite nanocatalyst. Correspondingly, the present invention also discloses a platinum-gallium composite nanocatalyst. The method of the present invention adopts a hot injection method, uses alcoholic solvents as solvents and reducing agents, and uses the reducing effect of alcoholic solvents to promote their joint reduction, nucleation and growth at high temperatures in a nitrogen environment.

Description

technical field [0001] The invention relates to the field of nanomaterials, in particular to a platinum-gallium composite nanocatalyst and a preparation method thereof. Background technique [0002] Compared with bulk materials, noble metal nanomaterials exhibit many completely different physical and chemical properties, and show broad application prospects in the fields of aerospace, energy, medicine, environmental protection, chemical industry and optoelectronics. Studies have shown that the properties of noble metal nanomaterials are closely related to their shape and size. People can control their properties by controlling the shape, structure and size of noble metal nanomaterials. However, how to realize the controllable synthesis of noble metal nanomaterials key to its application. [0003] Platinum, as a common noble metal material, has been widely used in the field of catalysis based on its excellent physical and chemical properties. Platinum-based catalysts show e...

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Problems solved by technology

However, the composition and particle size distribution of the composite catalyst prepared by the physical mixing method is not uniform; the nanocomposite degree of the catalyst obtained by the loading method is relatively low, and the repeatability is poor. Although the composite degree can be increased through post-treatment, it will reduce the catalytic performance of the catalyst to a certain extent. Performance and increased process costs; chemical reduction and thermal decomposition methods have many problems such as unclear synthesis mechanism, low yield, poor repeatability, and inability to synthesize on a large scale; in order to better control the shape and size of composite nanoparticles, traditional The synthesis is carried out in an oil phase system (such as oleylamine). These solvents are attached to the surface of nanoparticles and are difficult to remove by conventional methods (centrifugation or roasting). Under high temperature conditions, carbon deposits will form and adhere to the surface of the catalyst, thereby blocking the catalyst. surface active site

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