Verfahren zur Herstellung einer katalytisch aktiven Multimetalloxidmasse

摘要

In a process for producing multimetal oxide materials which contain tungsten and/or molybdenum, sulphur, phosphorus, arsenic, boron, silicium and/or germanium, vanadium and/or niobium as well as antimony and which are suitable as catalysts for the gas-phase catalytic oxidative conversion of methacrolein into methacrylic acid, sources which at least partially contain ammonium ions are used, and calcination is carried out in a calcination atmosphere largely devoid of NH3.