WHAT IS ACTIVATED ALUMINA?
Activated alumina is a porous, solid form of aluminium oxide, otherwise known as Al2O3 or alumina. This is the same mineral that makes up the precious gems ruby and sapphire, with impurities being the source of the stones’ bright colours. After activated alumina has been evacuated of existing moisture by heating it, the high surface area and many pores of the material allow for the uptake of water and other molecules through adsorption.
WHAT IS THE DIFFERENCE BETWEEN ACTIVATED ALUMINA AND MOLECULAR SIEVE?
While they often perform the same process of adsorbing moisture, activated alumina and molecular sieve differ in many ways. features pores whose size can be adjusted by ion exchange, allowing them to separate molecules based on size discrimination, a task other adsorbents are not capable of. This is why, for example, the molecular sieve is used in the separation of ethanol and water. The sizes of the pores of activated alumina cannot be tailored and are not necessarily uniform. However, activated alumina has its own pros. Activated alumina shows a higher affinity for water than the molecular sieve, so it is often used in the drying of various gas and liquid streams, instances when it is important to absorb the most moisture possible. Its high crush strength allows activated alumina to withstand the high pressures of industrial applications.
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