The pore size range of activated alumina is affected by a variety of factors, and the following are some of the main factors:

Aluminum hydroxide particle size: The particle size of aluminum hydroxide has a direct effect on the pore size of activated alumina. By controlling the precipitation and aging operating conditions, the particle size of aluminum hydroxide can be adjusted. Generally speaking, large-particle aluminum hydroxide can increase the porosity of the carrier and thereby increase the pore size of the activated aluminum oxide. However, this also leads to a decrease in the specific surface area of activated alumina, thus requiring a proper balance between the specific surface area, pore structure and grain size.

Adding pore-forming agent: Adding water-soluble organic polymer as pore-forming agent during precipitation can significantly affect the pore size distribution and pore size changes of activated alumina. These pore-forming agents are burned during the calcination process to form pores, thereby increasing porosity and controlling pore size. By adding different pore-forming agents, activated alumina with a specific pore size range can be obtained.

Molding and calcining process: Pore formation and calcining conditions during the molding process also have an important impact on the pore size of activated alumina. For example, adding a certain amount of xylog or surfactant to the hydrogel can change the accumulation performance of the crystal particles, thereby affecting the pore size distribution. In addition, the calcination temperature and time will also affect the formation and change of pore size. High temperature calcination may lead to enlargement of pore size and changes in pore structure.

Raw materials and preparation methods: Raw materials and preparation methods of activated alumina will also affect its pore size range. Different raw materials and preparation methods may lead to different pore structures and pore size distributions. For example, the pore size range of activated alumina prepared by acid precipitation, alkali precipitation, aluminum alcohol hydrolysis or carbonization may vary.