Abstract
Abstract The surface chemistry of well-defined Ru carbonyl complexes on dealuminated Y zeolites has been studied by in situ FTIR spectroscopy coupled with on-line analysis of the gas phase. Coordinatively unsaturated Ru subcarbonyls (mono- and dicarbonyls), obtained by a controlled decarbonylation of Ru tricarbonyl on the surface, react with olefins as ethylene and propylene in the gas phase and form well-defined olefin dicarbonyl complexes. The IR wavenumbers of the dicarbonyl [RuII(CO)2]2+ are shifted from 2084 to 2017 cm−1 in the uncoordinated dicarbonyl to 2064 and 1994 cm−1 in the ethylene complex [RuII(CO)2(C2H4)]2+ and to 2060 and 1993 cm−1 in the propylene complex [RuII(CO)2(C3H6)]2+. The olefin carbonyl complexes are active and highly selective catalysts for the dimerization of ethylene to n-butene. At 170 °C the selectivity to n-butene is >95%.
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