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Aluminium Oxide


Multi-Functional Sorbents for Excellent Reproducibility

Aluminium oxide was used as a sorbent when chromatography was discovered in the year 1903. One year after this invention, Merck KGaA, Darmstadt, Germany started to offer aluminium oxide for adsorption chromatography. Available in a variety of pore diameters and pH-ranges, these multi-functional sorbents ensure excellent reproducibility and extend your window of operations, thanks to their adsorptive and ion exchange properties.
The aluminium oxide crystal structure comprises octahedrally and tetrahedrally coordinated aluminium coupled by oxygen atoms. The surface is covered by free hydroxyl groups. There are different acidic and basic centers that result in anion and cation exchange properties. Aluminium oxide exhibits a higher pH-stability than silica gel, especially in the alkaline range and occurs in various crystal modifications resulting in different pore diameters. Our portfolio offers pore diameters of 6 nm, 9 nm and 15 nm.
Standardized aluminium oxide 90 is a sorbent of medium polarity. It is frequently used when the cation exchange properties of basic alumina are required. Furthermore, aluminium oxide may be used as an alternative to activated carbon, when the organic character of activated carbon can be problematic.

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