gammaalumiinioksidi

Gamma-alumiinioksidi, often written as gamma-alumina or γ-Al2O3, is a highly porous and high-surface-area allotrope of aluminum oxide. It is one of several phases of aluminum oxide, with alpha-alumina being the most stable and common form at room temperature. Gamma-alumina is characterized by its disordered crystal structure, which gives it a large number of active sites suitable for adsorption and catalysis.

The production of gamma-alumina typically involves the controlled precipitation and dehydration of aluminum hydroxide or aluminum oxyhydroxide precursors. The specific processing conditions, such as temperature and calcination time, significantly influence the resulting pore structure, surface area, and phase purity of the gamma-alumina.

Due to its unique properties, gamma-alumina finds widespread applications in various industrial processes. It is commonly used as a catalyst support in petroleum refining, particularly in fluid catalytic cracking (FCC) units, where it provides a stable and high-surface-area platform for active catalytic components. It is also employed in the production of other chemicals, such as in the dehydration of alcohols and in automotive catalytic converters for exhaust gas treatment.

Beyond catalysis, gamma-alumina serves as an adsorbent for removing moisture and other impurities from gases and liquids. Its high surface area makes it effective in drying agents and in chromatographic separations. The ability to be functionalized with other materials further enhances its utility in specialized applications.