KOJUNDONO NETSUTEKINIANTEINAKATSUSEIARUMINASHOKUBAITANTAISEIKEIHIN NO SEIZOHOHO

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 DEG C and 250 DEG C, followed by removal of water-leachable constituents and a subsequent thermal activation step. The products exhibit high thermal stability at elevated temperatures.