| abstract |
Molecular sieves are modified by an ion exchange process where metal cations are introduced into the molecular sieves by means of solid state ion exchange. The solid state ion exchange can be carried out as follows: a weighed amount of calcined and activated zeolite is intimately mixed with a precalculated amount of PtCl2, PdCl2, RhCl3, CuCl2, V2O5 or another compound of the noble metals (e.g., corresponding halides or oxides), the solids mixture is then heated in a current of inert gas (e.g., a current of helium gas or of nitrogen) to temperatures of 400 DEG to 600 DEG C., then cooled down to room temperature and subsequently reduced in a current of hydrogen for 10 to 14 hours at 280 DEG to 350 DEG C. in order to produce small metal clusters from the cationically introduced metal. |