Mehtod for the production of a catalyst for gas-phase oxidations by the coating of support materials in a fluid bed apparatus

摘要

The invention relates to a process for producing a catalyst for gas-phase oxidations, which comprises weighing a particulate inert support having a total mass of M_support into a fluidized-bed apparatus, providing an aqueous suspension of a catalytically active material or sources therefor and a binder having a binder content of B_susp, fluidizing the inert support by introduction of a gas stream heated to a temperature of T_gas at a flow rate of Q_gas, and spraying the suspension at a rate of Q_susp onto the fluidized inert support. When Q_gas, Q_susp, B_susp, M_support and T_gas are selected within the ranges 3000<=Q_gas [m³/h]<=9000, 1000<=Q_susp [g/min]<=3500, 2<=B_susp [% by weight]<=18, 60<=M_support [kg]<=240. 75<=T_gas [° C.]<=120 so that a parameter K defined as K=0.020 Q_gas-0.055 Q_susp+7.500 B_susp-0.667 M_support+2.069 T_gas-7 satisfies the relationship 127.5<=K<=202, high-quality coatings can be produced and the formation of twins made up of support particles adhering to one another can be avoided.