Abstract
Dehydrated nickel-containing silicoaluminophosphates SAPO-n (n=5,8,11) are catalytically active for ethylene dimerization. The catalytic activity of the SAPOs for this reaction is shown to be due to nickel (I) species in ion-exchange or framework positions. The ethylene dimerization activity and the selectivity for the formation of n-butenes is dependent on the location (ion-exchange vs framework site) of the nickel (I) species and on the channel size of the SAPO-n material. Electron spin resonance studies support the gas chromatography experiments showing that in SAPO-34 no reaction occurs, whereas in SAPO 5, 8 or 11 materials dimerization products are found.
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