Abstract
Dehydrated nickel-containing mesoporous MCM-41 and AIMCM-41 materials are catalytically active for ethylene dimerization. The catalytic activity is shown to be due to nickel(I) species in ion-exchange positions. The ethylene dimerization activity and product distribution is different in Ni-MCM-41 and Ni-AIMCM-41. Electron spin resonance studies show that an isolated nickel(I) species can be stabilized, which converts to a Ni(I)-C2D4 complex after ethylene adsorption. After subsequent heating to 343 K two new species are observed, which can be ascribed to Ni(I)-product complexes.
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