The invention provides a bleach catalyst composition comprising an adsorption product of: i) a porous material with active ionic sites and ii) certain mononuclear and dinuclear manganese complex ions in which manganese is either in the III or IV oxidation state and specific coordinating or bridging species. Also a process is provided for preparing such adsorption products; non-friable granules comprising such an adsorption product, a soluble binding/coating agent; and optionally an inert solid. Furthermore detergent compositions are provided comprising an adsorbed bleaching catalyst composition as described above.
