Process for producing silicon-containing materials in a stirred-tank reactor

A process for producing silicon-containing materials, comprising:

• thermal decomposition of silicon precursors in the presence of porous particles, wherein silicon is deposited in pores and on a surface of the porous particles;
• wherein the thermal decomposition of the silicon precursors takes place in a reaction zone of a gas-traversed reactor and the porous particles are circulated in the reaction zone during the thermal decomposition by using a stirring mechanism which is close-clearance in heated regions of the reaction zone;
• wherein the reaction zone is the region in the reactor in which a stirred particle bed is contacted with the silicon precursors and the precursor is decomposed;
• wherein the stirring mechanism is in close-clearance in accordance with equation 1
• W
• ⁡
• (
• h
• )
• =
• u
• R
• (
• h
• )
• u
• B
• (
• h
• )
• (
• 1
• )
• wherein for half of all values of h the close clearance W(h) in the reaction zone is W(h50%) >0.95;
• and
• wherein uR(h)=the outer circumference of the stirring mechanism in the sectional face at the height coordinate h and uB(h)=the inner circumference of the reactor in the sectional face at the height coordinate h.