2. Spray Pyrolysis (SP)

A spray pyrolysis shown in Figure X is well known in the production of oxide, metal-oxide and metal powders. The particle composition and properties are tightly linked to the precursor solution that can contain either dissolved or suspended reagents. The precursor solution is first atomized to the droplets using e.g. ultrasonic nebulizer. The droplets are then carried to a heated laminar flow reactor where the evaporation of the solvent and the reactions of the reagents take place, and the final product particles are formed. The size of the droplets and subsequently the size of the final product particles can be controlled by choosing the correct atomization method. The composition and morphology of the particles is dependent on the residence time, temperature, reactivity of the reagents, and gas phase atmosphere.