A kind of preparation method of palladium carbon catalyst

Abstract

The invention relates to a preparation method of a palladium-carbon catalyst, and belongs to the field of noble metal catalysts. The preparation method comprises the following steps: performing high-temperature pretreatment on a carbon support with a high specific surface area, and dispersing in a water phase; dropwisely adding a prepared palladium precursor solution into the carbon support dispersion solution, and stirring and impregnating for some time; performing vacuum filtration on the loaded dispersion solution, washing, and drying; and roasting the dried carbon support in a nitrogen protective atmosphere, and reducing with mixed gas of nitrogen / argon, carbon monoxide and vapor to obtain the palladium-carbon catalyst. In the prepared palladium-carbon catalyst, the active carbon with a high specific surface area is used as the support, and the noble metal Pd is loaded; and the content of the metal Pd in the palladium-carbon catalyst based on mass percent is 0.5-10%.

Description

technical field [0001] The invention belongs to the field of noble metal catalysts, in particular to a preparation method of a palladium carbon catalyst. Background technique [0002] Palladium carbon catalyst is a commonly used hydrogenation catalyst, widely used in carbonyl hydrogenation, olefin hydrogenation, nitro and nitroso hydrogenation and other fields. The main factors affecting catalyst activity are the content of active metal, particle size and dispersion, catalyst surface structure and so on. The influencing factors are mainly related to the type of carrier, pretreatment method, impregnation method, reduction method and temperature. [0003] Traditional palladium-carbon catalysts mostly adopt wet reduction method. Due to the weak force between the active component and the carrier, the catalyst obtained by this method has the phenomenon of growth and loss of palladium particles during the reaction process, which leads to a decrease in the dispersion of the cataly...

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Problems solved by technology

However, the preparation of the catalyst does not control the particle size of metal palladium, and organic solvents such as aromatic hydrocarbons are used, and the preparation process is relatively complicated.

[0004] Chinese patent CN100402144C discloses a kind of preparation method of Pd / C catalyst, adds complexing agent in Pd-containing solution, such as 8-hydroxyquinoline etc. and water are mixed with palladium mixed solution impregnating or spraying carrier activated carbon, complexing agent and Pd Produce stronger interaction and produce a kind of complex compound, the metal Pd of the catalyst prepared by this method is easy to lose during use, causes catalyst activity to decline

[0005] It can be seen that the traditional catalyst preparation technology can not meet the requirements of industrial application, it is necessary to improve the preparation method of the catalyst, and find a kind of high stability palladium carbon catalyst synthesis technology, so as to be convenient for industrial application

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