Method for producing nanoparticulate solid materials

A process for producing nanoparticulate solids by means of a Péclet number-stabilized gas-phase reaction, which comprises

• a) providing a reaction gas,
• b) passing the reaction gas through at least one reaction zone comprising a porous medium and subjecting it to a reaction which is stabilized by the medium and occurs at least partly in the interior of the porous medium and in which nanoparticulate primary particles are formed, with a luminous zone being present completely within the porous medium,
• c) subjecting the reaction product obtained in step b) to rapid cooling and
• d) isolating the nanoparticulate solids formed.