Method of preparing a monolithic catalytic element comprising a fibrous substrate and said monolithic element catalysis

The subject of the present invention is a process for preparing a monolithic catalysis element comprising a fibrous support and a catalytic phase supported by said fibrous support and also said monolithic catalysis element. Said process comprises: the preparation of a porous coherent structure based on refractory fibres; the preparation of a substrate comprising said porous coherent structure and of the nanocarbon supported by said porous coherent structure in the volume thereof; the grafting to said substrate, by p interaction, of at least one aromatic compound containing in its chemical formula, on the one hand, at least one aromatic ring, advantageously at least two, very advantageously four, aromatic rings and, on the other hand, at least one function chosen from acid catalytic functions, basic catalytic functions, metallic precursor functions, functions that can be transformed in situ into metallic precursor functions and mixtures thereof.