EXAFS STUDY OF NICKEL TETRACARBONYL AND Ni-CLUSTERS IN ZEOLITE Y

T. Bein , S. Mclain , G. Stucky , G. Woolery , D.E . Sayers , K. Moller

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-Ni 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 Ni 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 increasing temperature.

Domains: Physics archives

T. Bein, S. Mclain, G. Stucky, G. Woolery, D.E . Sayers, et al.. EXAFS STUDY OF NICKEL TETRACARBONYL AND Ni-CLUSTERS IN ZEOLITE Y. Journal de Physique Colloques, 1986, 47 (C8), pp.C8-277-C8-280. ⟨10.1051/jphyscol:1986852⟩. ⟨jpa-00226174⟩