Homogeneous Fe and Mn oxidation catalysts can be immobilized on silica, zeo
lites, clays, layered double hydroxides and polymers. In addition to the we
ll-known porphyrin catalysts, there is increasing interest in complexes wit
h non-planar ligands. Based on a selection of examples, this paper discusse
s heterogenization methods, and the effects of heterogenization on the cata
lytic activity. (C) 2000 Elsevier Science B.V. All rights reserved.