The role of alumina catalyst carrier

In early research on catalyst carriers, the main function of catalyst carriers was to support active metals and ensure that the active components were uniformly loaded as much as possible, and then to provide the catalyst with sufficient mechanical strength and thermal stability.

With the deepening of research and the widespread use of catalyst carriers, researchers have found that catalyst carriers are not only carriers, but also promoters of catalysts under certain conditions, and have catalytic performance. The selection of catalyst carriers is crucial for the development of catalysts. What are the functions of alumina catalyst carriers reflected in? Today, the editor of Dao Xiaoxiao will share with everyone.

Generally, suitable catalyst carriers with suitable physical and chemical properties should be selected based on the actual requirements of chemical reactions, such as the mechanical strength, density, pore structure, particle size, and shape of the catalyst carrier.

A good catalyst carrier should at least meet the following conditions: ① suitable for the shape and size of a specific reaction; ② Having sufficient mechanical strength; ③ Capable of providing sufficient specific surface area and suitable pore structure for the catalyst; ④ Having sufficient chemical and thermal stability; ⑤ Wide source of raw materials and low manufacturing cost; ⑥ It can be compatible with active components to ensure good catalyst activity; ⑦ No additional side reactions, low impurity content; ⑧ Improve the heat resistance of the catalyst.

The reason why alumina carriers are widely used is because they possess a series of excellent characteristics, including: ① high melting point and good thermal stability of alumina; ② The presence of both acidic and alkaline centers on the surface of alumina supports enables them to possess various catalytic properties; ③ There are various transition phases in alumina carriers, with diverse crystal and pore structures and wide selectivity.

Among all hydrodesulfurization catalyst carriers, alumina carrier is commonly used. In various transition phases of alumina carriers γ- Al2O3 has a large porosity, specific surface area, good mechanical strength, and more suitable surface acidity, making it a good choice for the support of hydrodesulfurization catalysts.

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