Types of hydrogenation catalysts and manufacturing methods

Hydrogenation catalysts are divided into those used in oil refining and those used in the chemical industry. In oil refining, there are catalysts for hydrocracking, as well as catalysts for hydroprocessing (demetallization, desulfurization, decarburization, denitration), among others. In the chemical industry, the main types include C2/C3/C4 selective hydrogenation catalysts, hydrogenation catalysts for cracked gasoline, and aromatic hydrocarbon hydrogenation catalysts, etc. Precious metal hydrogenation catalysts include palladium, platinum, rhodium, ruthenium, and Raney nickel.

Types of hydrogenation catalysts: Classified by production purpose: hydrogenation refining, hydrocracking, hydrodewaxing, lubricant hydrogenation, etc. Manufacturing method: Co-gelation method and impregnation method. Specific steps for the co-gelation method: 1. Gel formation ； ⒉Filtering, washing ； ⒊coagglutinant ； ⒋Drying ； ⒌Crushing, tableting ； ⒍Activation. The impregnation method is slightly different from the one mentioned above. Read the book yourself for details.

There are generally three methods for preparing catalysts: impregnation, coprecipitation, and kneading. Impregnation method: Advantages: The active components are all dispersed on the surface of the catalyst, thus achieving the highest utilization rate of these active components in catalytic reactions ； The preparation of the support and the catalyst can be carried out under their respective optimal conditions, thereby achieving the best performance of the catalyst. Disadvantage: The maximum amount of the active component on the catalyst is limited by the carrier’s ability to adsorb the molecules (or ions) of the active component present in the impregnation solution, the pore volume, and the maximum concentration of the active component that can be present in the impregnation solution. Co-precipitation method: Advantages: The active component of the catalyst is tightly bound to the carrier through strong chemical bonds, and in principle, there is no limit on the amount of active component in the catalyst. Disadvantages: The proportion of active components on the catalyst surface is low, resulting in poor utilization of these active components; multiple washes and filtrations are required. Kneading method: Advantages: The production process is relatively simple, and it is easy to produce catalysts containing multiple active components as well as those with high levels of active components. Disadvantages: The degree of dispersion of the active components, as well as the strength and completeness of their binding to the carrier, are low; this results in a low utilization rate of the active components. These components usually exist in salt form, which affects the mechanical strength of the catalyst particles. The commonly used method at present is the impregnation method.

Which do you think is better for aldehyde hydrogenation? Where is it available?

I recommend that you take a look at \"Catalyst Preparation Process Technology\"