Olefin Oligomerization Over High Silica Zeolites

Olefin oligomerization over high silica zeolites was studied at elevated pressure. Silicalite and ZSM-5 were particularly effective at producing substantial yields of high boiling liquid in par due to a high ratio of oligomerization activity compared to hydrogen transfer activity. When dimerization predominated, the reaction was second order with an E a of about 42 kJ/mole. Product shape selectivity was not found. The conversion of long chain mono olefins over ZSM-5 indicated that much of the reaction took place at or near the external surface of the sieve. The addition of Ni to ZSM-5 increased both activity and selectivity for linear product.