... in other phases, namely η-, χ-, γ-, δ- and θ-aluminas. Each has a unique crystal structure and properties. The so-called β-alumina proved to be ... the production of aluminium, usually by the Hall process.As a fillerBeing fairly chemically inert, relatively non-toxic, and white, ... for dehydration of alcohols to alkenes.Alumina serves as a catalyst support for many industrial catalysts, such as those ...