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Infrared characterization of alumina-supported Re2(CO)10 and Mn2(CO)10

1988; Science Press; Volume: 45; Issue: 3 Linguagem: Inglês

10.1016/0304-5102(88)80069-5

1873-3131

Adriano Zecchina, E. Escalona Platero, C. Otero Areán,

Catalysts for Methane Reforming

The interaction of Re2(CO)10 and Mn2(CO)10 with highly dehydroxylated γ-A12O3 is studied by means of a detailed examination of the IR spectra corresponding to increasing amounts of adsorbed metal carbonyl. Adsorption occurs via O-bonding between an axial CO ligand and Lewis acid centres present at the γ-Al2O3 surface. These are mainly bulk tetrahedral and bulk octahedral Al3+ ions emerging on the surface. It is shown that the interaction between the adsorbed molecule and γ-Al2O3 is strong enough to cause a pronounced alteration of the IR spectrum of the metal carbonyl. Two sets of IR absorption bands are observed in the carbonyl stretching region. These are respectively assigned to M2(CO)10 (M = Mn, Re) interacting with two types of surface sites of different Lewis acid strengths.