Shaped bodies having catalytic properties which can be obtained by a process comprising the steps:a) production of a shaped body by means of a powder-based rapid prototyping process,b) if appropriate, a heat treatment of the shaped body,c) if appropriate, application of at least one catalytically active component to the shaped body,d) if appropriate, a further heat treatment,where steps b), c) and / or d) can be carried out a number of times,are used as reactor internals in heterogeneously catalyzed chemical reactions.