Why does activated alumina have adsorption effect

Why does activated alumina have the function of adsorption and drying? The adsorption of activated alumina can be divided into physical adsorption and chemical adsorption, because of the molecular force difference between the surface of activated alumina and the adsorbent. Today, the editor of Zhongtianli will talk to you about this topic.

In the physical adsorption of activated alumina, adsorption is generated by the intermolecular force between the adsorbent and the adsorbent. In the chemical adsorption of activated alumina, the adsorbed molecules undergo chemical reactions with atoms on the surface of the adsorbent, including electron transfer, atomic rearrangement, destruction, and chemical bonding between activated alumina and the adsorbent. Physical adsorption occurs in the active adsorption and drying areas of alumina. Physical adsorption has the following characteristics.

1. The adsorption force is small, and the adsorbed gas molecules tend to return to the gas phase, which is known as "desorption".

The physical adsorption process of activated alumina is reversible, requiring almost no activation energy (even small), and the adsorption and desorption rates are very fast. Therefore, it can be assumed that activated alumina and adsorbent immediately adsorb.

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

4. Physical adsorption has no selectivity, which means that due to differences in adsorption capacity, all solids can adsorb gas (adsorption with too small adsorption capacity 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 adsorbent.

Yangzhou Zhongtianli New Materials Co., Ltd. is a technology-based enterprise specializing in the research and development, production, and sales of high-purity materials. The purity of activated alumina produced by the company using the alcohol salt hydrolysis process can reach over 99.9%, and the pore volume, pore size, and specific surface area can be adjusted according to customer requirements. Welcome to inquire!