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Aluminium oxide is a compound made up of two aluminium atoms that bond with three oxygen atoms. The resulting compound is white, odorless and insoluble in water and many other solvents.
The chemical formula for aluminum oxide is Al2O3. It has an oxidation number of n and is commonly referred to as alumina, alpha alumina, alundum, or alkoxide.
It occurs naturally in the mineral corundum, which is a crystalline polymorphic form of aluminium oxide that is used to make precious gemstones such as rubies and sapphires. It is also used as an abrasive and as a refractory material, because of its high melting point and hardness.
A hydrated form of aluminium oxide (Al2O3*3H2O) is the least expensive adsorbent for gas dehydration, but it can be costly to operate. It has an equilibrium water capacity of 35%-40% of its own weight and is not as selective as molecular sieves because it does not have a precise pore opening like they do.
XRD analysis on the powder sample indicates that the observed peaks were assigned to those of d-Al2O3 and were broadened slightly due to the small crystallite size of the sample. The average DXRD was 14.5 nm.
In order to compare the particle size distribution determined by the present procedures with that obtained by microscopic observations, TEM measurements were performed on the d-Al2O3 sample. Inset in figure 3 shows a size histogram by the TEM image and the calculated log-normal distribution curve.