THERMALLY STABLE, SHAPED ALUMINA CATALYST CARRIERS

摘要

Thermally stable, shaped alumina catalyst carriers are made by treating an alumina shape of predominantly chi-rho-eta or pseudoboehmite crystalline phase structure, or mixtures thereof, with an ammonium salt in an aqueous medium under pressure within the temperature range of about 100.degree.C and 250.degree.C, followed by removal of water-leachable constituents and a subsequent thermal activation step. The products exhibit high thermal stability at elevated temperatures.