CoachA catalyst support is a porous, high-area solid (alumina, silica, carbon) that carries small particles of the active phase. A promoter is an additive, inactive alone, that raises the activity, selectivity or stability. A catalyst poison is a substance that binds strongly to the active sites and blocks them. The metal dispersion is the fraction of the metal atoms that lie on the surface. Sintering is the growth of the particles at high temperature, which lowers the dispersion.
