Flexible and porous membranes and adsorbents, and method for the production thereof

Method for making flexible and porous materials based on oxidic and ce- ramic oxidic not including carbon, comprising the subsequent steps: a) manufacturing a base material fiber materials whose components are kept together essentially through links with hydrogen bridges, in a suitable machine for making paper; b) treatment of the base matrix under pyrolysis conditions at elevated temperature in an atmosphere which is essentially free of oxygen, characterized in that the surface of the base matrix is ​​coated prior to pyrolysis by one or two sides with a polymer film .