The fluidization characterisitcs of nanoparticle agglomerates have been experimentally and numerically studied in a fluidized bed. The experimental studies were carried out in a bed containing silver oxide dry powder belonging to group B of Geldart's classification with a primary particle size of 30 nm. Pressure drop measurements using a optical fiber technique allowed the effects of particle loading and inlet gas velocity on the fluidization characteristics of the particles to be determined. Interparticle adhesion forces between silver oxide nanoparticles give rise to the formation of agglomerates with a wide size low bed expansion. Numerical simulations were also performed to evaluate the sensitivity of gas-solids drag models. An Eulerian multiphase model was used with different drag models. A mean particle size of 175 mu m was chosen for the numericla simulations, and the results obtained for the minimum fluidization velocity and bed expansion ration show that the modified Syamlal-O'Brien model provides the closest fit to the experimental data.