Method for preparing coated-type palladium carbon catalyst

Abstract

A method for preparing a coated-type palladium carbon catalyst comprises the following steps: a) preparing a solution of a palladium salt; b) adding a certain amount of a stabilizer and a reducer into the solution of the palladium salt to form a nano palladium suspension at a certain temperature from the palladium salt; c) after adding a certain amount of the stabilizer into the nano palladium suspension, continuing to add a solution of an embedding agent, adjusting the pH with an alkali liquid for hydrolysis of the embedding agent to produce a coated nano palladium particles; and d) Finally, adding the coated nano palladium particles into active carbon charcoal slurry to obtain the coated-type palladium carbon catalyst; technical effects are that after metal palladium is coated, on one hand, loss, coalescing or poisoning of the metal palladium in a subsequent reaction process can be effectively reduced, on the other hand the coated-type palladium carbon catalyst has certain hydrophobic or hydrophilic effect, the use range and cycle times of the coated-type palladium carbon catalyst can be improved, the plant cost can be reduced, environmental pollution can be reduced, and the coated-type palladium carbon catalyst is more in line with the concept of green chemistry. The preparation method is simple and easy, raw materials are cheap and easily obtained, and the method is more suitable for industrial production.

Description

technical field [0001] The invention relates to a method for preparing a coated palladium-carbon catalyst, which belongs to the technical field of catalyst preparation. Background technique [0002] In recent years, precious metals have gradually become a research hotspot due to their unique applications in catalysis, gas sensors, fuel cells and other fields. However, due to the high surface energy of nano-noble metals, they are easy to aggregate or change their morphology, which will lead to a decrease in the catalytic activity and selectivity of metal particles. In order to reduce the aggregation of metal nanoparticles, people have been looking for new methods, such as the use of surfactants, to protect the surface of metal particles. For example, Copelin discloses a kind of Pd / SiO in European patent EP0009802 2 Catalyst and the method for preparing hydrogen peroxide by anthraquinone method, palladium catalyst is relatively stable in this process, probably because pallad...

AI Technical Summary

Problems solved by technology

Palladium carbon is a very commonly used noble metal catalyst, which can be used for nitro hydrogenation, alkyne reduction, Suzuki / Heck reaction, hydrogenation of benzene ring, hydroxyl oxidation, etc., but so far, there are few literature reports on palladium carbon Metal palladium is coated on the carbon catalyst, and the coated catalyst can have certain characteristics of hydrophobicity, hydrophilicity or acid and alkali resistance