Noble metal-loaded catalyst, as well as preparation method and application thereof

Abstract

The invention provides a noble metal-loaded catalyst, as well as a preparation method and application thereof. The preparation method comprises the following steps a) fixing a carrier under the liquidlevel of a reaction vessel containing deionized water, after the temperature is stabilized, vigorously stirring at the bottom of the vessel, at the same time, adding a neutrally adjusted aqueous solution containing noble metal at a uniform speed, taking out the carrier after the reaction is completed; and b) cleaning and drying the carrier to obtain the noble metal-loaded catalyst. Compared withthe prior art, the noble metal prepared by using the invention has the high dispersion, stable catalytic performance and low loss.The catalyst containing different components and different noble metalloading amount can be prepared according to requirements of different reaction equipment and reaction types, the operation is flexible and easy to control, and the catalyst is suitable for gas / liquidphase and aqueous / non-aqueous phase reaction systems, and can be separated easily from products after the reaction is completed.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a loaded noble metal catalyst, a preparation method and an application thereof. Background technique [0002] As an effective catalyst, noble metals have the advantages of good stability, strong catalytic activity, high efficiency, and mild reaction conditions. As active components of catalysts, noble metals have been widely used in industrial catalysis. At present, precious metals are rarely used alone as catalyst materials, and are mostly supported on other materials, such as carbon materials, oxides, polymer materials, etc. Due to the suitable pore size, special structure and electronic properties of these support materials, it is beneficial to increase the specific surface area of ​​the catalyst, form a suitable empty island structure, change the electronic properties of the noble metal surface, and provide a certain macroscopic three-dimensional structure and mechanical ...

AI Technical Summary

Problems solved by technology

For example, the process price of deposition and precipitation is complicated, the raw material cost of sol-gel method is high, and the dispersibility of impregnation method is often poor.

They also have some defects that the precious metal and the supporting material are often only physically adsorbed together, which makes the force between them small. During use, the precious metal particles will easily aggregate and lose, making its catalytic activity This will not only reduce the recyclability of the catalyst, increase the cost of use, but also have a certain impact on the quality of the catalytic product

At the same time, part of the noble metal will be covered by the carrier during the preparation of the catalyst, which reduces the effective activity of the catalyst and the utilization rate of the noble metal.