Patent ID: 7572946

Claim:
In a process comprising catalytically oligomerizing a feed comprising at least one olefin the improvement wherein the oligomerization catalyst comprises a non zeolitic support based on silica-alumina containing a quantity of more than 5% by weight up to not more than 95% by weight of silica, (SiO 2 ) and said catalyst has the following characteristics: a mean pore diameter, measured by mercury porosimetry, in the range of 20 to 140 Å; a total pore volume, measured by mercury porosimetry, in the range of 0.1 ml/g to 0.6 ml/g; a total pore volume, measured by nitrogen porosimetry, in the range gf 0.1 ml/g to 0.6 ml/g; a BET specific surface area in the range of 100 to 550 m 2 /g; a pore volume, measured by mercury porosimetry, included in pores with a diameter of more than 140 Å, of less than 0.1 ml/g; a pore volume, measured by mercury porosimetry, included in pores with a diameter of more than 160 Å, of less than 0.1 ml/g; a pore volume, measured by mercury porosimetry, included in pores with a diameter of more than 200 Å, of less than 0.1 ml/g; a pore volume, measured by mercury porosimetry, included in pores with a diameter of more than 500 Å, of less than 0.1 ml/g, an X ray diffraction diagram containing at least the principal characteristic peaks of at least one of alpha, rho, khi, eta, gamma, kappa, theta and delta transition aluminas, and recovering an effluent from the oligomerization.