Thermal behaviour of aluminas with different morphologies

The thermal stability of two commercial aluminas before and after dry impre gnation treatment tvas studied. One alumina was mesoporous and the other, a spherical material, was non-porous. Characterisation of these material bef ore and after thermal treatment was performed by XRD, SEM, and measurements of surface area and pore size distribution. Spherical alumina was found to exhibit greater thermal stability when compared with the conventional poro us alumina. The stability of spherical alumina tvas reduced by dry impregna tion. It was shown that the morphology of these materials plays an importan t role in their thermal stability.