Method for producing nanoparticulate solid materials

Abstract

The invention relates to a process for producing nanoparticulate solids by means of a Péclet number-stabilized gas-phase reaction.

1 . 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. 
 
     
     
         2 . The process according to  claim 1 , wherein essentially no temperature gradient perpendicular to the direction of flow occurs in the reaction zone. 
     
     
         3 . The process according to  claim 1 , wherein the porous medium comprises ceramic material. 
     
     
         4 . (canceled) 
     
     
         5 . The process according to  claim 1 , wherein the pore volume of the porous medium is at least 40%, based on the total pore volume of the medium. 
     
     
         6 . The process according to  claim 1 , wherein the particle size of the nanoparticulate solids is in the range from 1 to 500 nm and its particle size distribution has a standard deviation a of less than 1.5. 
     
     
         7 . The process according to  claim 1 , wherein the residence time of the starting mixture in the reaction zone is from 0.005 s to 2 s. 
     
     
         8 . The process according to  claim 1 , wherein the gas-phase reaction proceeds at atmospheric pressure. 
     
     
         9 . (canceled)