Bein, Thomas and McLain, S. J. and Stucky, Galen D. and Woolery, G. and Sayers, D. E. and Möller, Karin
EXAFS study of nickel tetracarbonyl and nickel clusters in zeolite Y.
In: Journal de Physique, Colloque C8, Suppl. 12, Vol. 47: pp. 277-280
Adsorption and thermal decomposition of Ni(CO)4 in the cage system of zeolite Y
have been studied with EXAFS, electron microscopy and IR spectroscopy , Ni(CO)4
is adsorbed as an intact molecule in both cation - free zeolite Y and NaY. Symmetry
changes of the molecule in NaY are assigned to the formation of Na—OC-IMi bridges.
Thermal treatment of the Ni(CO)4/NaY adduct leads to loss of CO concomitant with
the formation of a binodal Ni phase. A major part of the forms clusters with
diameter between 0.5 and about 1.5 nm, in addition to larger crystallites
(5-30 nm), sticking at the outer surface of the zeolite matrix.,
The Ni-Ni scattering amplitude indicates increasing average particle size with