Application of high purity alumina in the field of catalysts

- Jan 31, 2021-

As we all know, alumina is one of the most widely used inorganic metal oxides. The applications of high-purity alumina are also varied. First, let's talk about the application of high-purity alumina in the field of catalysts.

In modern petrochemical and chemical industries, more than 90% of chemical reactions need to be achieved through catalysts. At the same time, the catalyst is also widely used in new energy development, comprehensive utilization of resources and environmental pollution control. It can be seen that the amount of catalyst used is very large, and the types of catalysts are also various. However, how to improve the efficiency of catalyst use has been a concern of major domestic and foreign companies in recent years, so the predecessors developed Catalyst carrier to improve catalyst efficiency. After years of research and development, solid catalysts used in oil refining, petrochemicals or fine chemicals all need carriers. γ-alumina (activated alumina) carriers account for about 60% of the catalyst carrier industry. Among them, about 10-20% need to use high-purity activated alumina as a carrier, mainly used in hydrogenation catalysts, special gas treatment catalysts and other precious metal catalysts. The main indicators include: specific surface area, pore volume, and pore size. In addition to the high purity of the high-purity activated alumina obtained through the alkoxide hydrolysis process, the specific surface area, pore volume, pore diameter and other related parameters of the product can also be adjusted through process advantages to meet the index requirements of different catalyst carriers.

The commonly used shapes of the catalyst carrier include: columnar, ring, spherical, sheet, granular, extruded, and so on. The process can also be roughly divided into two categories. To put it simply, one: First, the activated alumina is made into the required shape and then the catalyst component is loaded by soaking; the second: the activated alumina and the catalyst component are now loaded After mixing, it is made into the required shape by the instrument to form a new type of catalyst.

At present, most of the activated alumina used in domestic precious metal catalysts is made from German sasol SB powder. Domestic Shandong BaIRui and Xiangrun  is also trying to replace German sasol and break its monopoly by using the same process.