Particle nucleation and sintering in supported metal catalysts

4 Particle nucleation and sintering in supported metal catalysts 

Two mathematical models for sintering mechanisms for supported metals have been put forward (1) a particle migration model where particles migrate over the surface of the support, collide and fuse, causing loss in dispersion (e.g. Ruckenstein et al 1984) and (2) an atomic migration model involving the 

The earlier investigations, previously referred to, used empirical models to understand sintering. Here, the dispersion ( ) ) of a sintered catalyst (e.g. Pt/alumina) is correlated with the dispersion of the fresh catalyst ( q), using a power law  

---