Selection of polymerization catalysts and apparatus for carrying this out

A method of selecting polymerization catalysts from a multiplicity of polymerization catalysts based on catalytic properties of the polymerization catalysts comprising:

• in a pretreatment step, converting a multiplicity of catalyst precursors or catalyst supports in parallel into polymerization catalysts in an array of reactors, wherein the pretreatment step comprises at least one thermal treatment step at from 250 to 1200° C.;
• in a polymerization step, converting at least one starting material into at least one polymer product with the aid of the respective polymerization catalysts;
• and
• in an analysis step, analyzing at least one composition and chosen properties of the polymer product or products formed in the polymerization step,
• wherein a feed stream comprising at least one monomer is fed continuously to the respective reactors in at least one of the pretreatment step and the polymerization step, and the feed stream is passed through the respective reactor in such a way that a fluidized bed of catalyst is produced.