Why does activated alumina have the ability to adsorb and dry

Why does activated alumina have the ability to adsorb and dry? The different forces between the surface of activated alumina and the adsorbate molecules can be divided into physical adsorption and chemical adsorption. For the physical adsorption of activated alumina, the adsorption phenomenon occurs between the adsorbent and the adsorbate through intermolecular attraction. In the chemical adsorption of activated alumina, the adsorbed molecules interact with the atoms on the surface of the adsorbent, leading to phenomena such as electron transfer, atomic rearrangement, or the destruction and generation of chemical bonds between the activated alumina and the adsorbent.

Physical adsorption occurs within the drying range of activated alumina adsorption. What are the characteristics of physical adsorption? Follow the active alumina manufacturer Yangzhou Zhongtianli to learn more.

1. The adsorption force is small, and the adsorbed gas molecules are more likely to return to the gas phase - that is, they are more likely to "desorption" (also known as "desorption");

2. The process of physical adsorption of activated alumina is reversible, requiring almost no activation energy (even small if needed), and the adsorption and desorption rates are both fast. It can be considered that once activated alumina comes into contact with the adsorbate, adsorption occurs immediately;

3. All adsorption processes of activated alumina are exothermic reactions, and the "adsorption heat" released by physical adsorption is much less than that of chemical adsorption. Its heat is close to the heat of vaporization in the liquid state of the adsorbent or the heat of condensation in the gas state;

4. Physical adsorption has no selectivity, that is, any solid can adsorb any gas, only due to the difference in adsorption amount (adsorption effect with too small adsorption amount has no practical application value);

5. The physical adsorption of activated alumina is related to coagulation, so it can only be carried out below the boiling point of the adsorbed substance.

The above is the relevant content about activated alumina organized by Yangzhou Zhongtianli, a manufacturer of activated alumina, hoping to provide some help to everyone. If you would like to learn more about activated alumina, please feel free to contact us. Yangzhou Zhongtianli New Materials Co., Ltd. is a technology enterprise specializing in the production of isopropanol aluminum, isopropanol aluminum trimer, secondary butanol aluminum, pseudo boehmite, high-purity arsenic, high-purity aluminum oxide, etc. It has multiple technologies and has received unanimous praise in the industry.