Method for the Fixation of Metals, Transition Metals and their Oxides on Siliceous Materials of Plant Origin and Use of these Modified Siliceous Materials as a Catalyst and a Loading Material for Pigments, Paints, Plastics, Elastomers and Sizing Materials

A method for the fixation of metals, transition metals and their oxides on a siliceous support material of plant origin, characterized in that:

• a. silicate-containing biomass is used, wherein the latter contains more than 0.5% of silicates (relative to the dry mass of the biomass used),
• b. the spectrum of the non-silicon metals present in the biomass (this means all metals apart from silicon) is defined in that in a first washing step, all unwanted non-silicon metals present in the biomass are dissolved by means of the washing solution used and the washing solution is removed and in that in a second step, the biomass is treated with a substance or is soaked in the latter which contains the required metals and/or transition metals and/or their oxides or their mixtures,
• c. the metals and/or transition metals and/or their oxides or their mixtures present in the biomass are fixed in a combustion step on the siliceous skeleton of the plant, which remains at the end of combustion as ash, on which the existing metals and/or transition metals and/or their oxides or their mixtures have been fixed,
• d. pre-drying of the biomass may optionally be carried out before combustion.