STUDY ON SURFACE-CHEMISTRY OF POROUS NIF2-MGF2 SYSTEM

Nickel carbonate and magnesium carbonate were used as precursors of Ni F2-MgF2 samples of various percentage compositions. The preparations o btained were examined using X-ray spectroscopy, IR spectroscopy and ca talytic tests. It was shown that NiF2 and MgF2 formed a common crystal lattice of the rutile type. New Lewis acid centres appeared on the su rface of the NiF2-MgF2 system which originated from the coordinatively unsaturated Ni2+ ions. In addition, an increased number of redox or b asic centres arising from the O-, F- or OH- groups on the surface of t he studied preparations was also detected. The low catalytic activity of the NiF2-MgF2 samples indicated the possibility of using this syste m as a support rather than a catalyst.