In the present paper the behaviour of two different nano-sized powders, Al2O3 (40
nm) and SiO2 (15 nm), during aeration has been investigated. The materials have
been characterized as received by means of granulometric and SEM analyses in
order to estimate the size of their natural agglomerates. Aeration tests have been
carried out in a laboratory scale fluidized bed at ambient temperature and pressure
and using nitrogen as fluidizing gas.