Oligomerization of liquid olefin over a nickel-containing silicaceous crystalline molecular sieve

A process for oligomerizing alkenes comprising:

• (a) contacting a C.sub.2 to C.sub.20 olefin or mixture thereof in the liquid phase with a nickel-containing silicaceous crystalline molecular sieve in the hydrogen form selected from the group consisting of silicalite, an organosilicate disclosed in U.S. Pat. No. RE 29,948, and CZM or mixtures thereof, at a temperature from about 45.degree. F. to about 450.degree. F.;
• (b) recovering an effluent comprising oligomerized alkene.