Schmidt, Friedrich; Bein, Thomas; Ohlerich, U.; Jacobs, Peter A.
Agglomeration mechanism during the preparation of nickel(0) and iron(0) zeolites.
6th International Zeolite Conference, 10-15 July 1983, Reno, USA.
Magnetization measurements have been used to study the reduction process of Ni - zeolites and the thermal decomposition of
iron pentacarbonyl adsorbed on NaY zeolites . The Ni(0) particle size distribution in H2»reduced NiNaA, Ni NaX, Ni NaY and
NiNaM is bidisperse. The amount and the volume of particles
exceeding the cage dimensions increases in the sequence Μ,Υ,Χ,Α
zeolites. Particle fusion is found to be the rate determining
step. With decomposition of Fe(C0)5/NaY adducts, up to 97 wt.%
of the iron particles produced are smaller than 1.3 nm. Fluidized
sample bed, inert gas atmosphere and fast heating up to
440 Κ are essential to reach mononodal dispersion.