Producing mouldings for catalytic use from pyrogenic silicic acid - by hydrothermally treating initially moulded body with ammonia contg. solution

摘要

Mouldings based on pyrrogenic silicic acid are produced by hydrothermally treating an initially moulded body with an ammonium solution or a solution of a compound which liberates ammonia. The initial body is produced by mixing particles of the pyrogenic silicic acid in aqueous phase with either a silica sol or an aqueous or aqueous/alcoholic ammonium solution to form a paste which is moulded, dried and calculated. USE/ADVANTAGE - Producing catalyst supports or catalysts. The particles of pyrogenic silicic acid are held together with using a binding agent thereby producing high mechanical stability. The final product has a high specific porous volume and high specific surfacesp