Process for the dimerization or co-dimerization of linear olefins and

Abstract

Process for the preparation of catalysts suitable for the production of linear olefins by dimerization or co-dimerization of linear olefins having small numbers of carbon atoms, characterized by depositing one or more metals chosen from among those belonging to group VIII of the periodic system of elements on a natural or synthetic crystalline zeolite by ion exchange to a quantity of deposited metal of from 0.1 to 50% by weight with respect to the zeolite itself, by bringing the resulting product into contact with an organic or inorganic base in the liquid or gaseous form at a temperature in the range from -35 to 250.degree. C for a time of at least 30 minutes, and by eliminating the excess of the base and heat-treating at temperatures in the range from 50 to 450.degree. for at least 30 minutes, and a process for the preparation of linear olefins having from 6 to 24 carbon atoms in the molecule, characterized by the introduction of one or more linear olefins having from 3 to 12 carbon atoms in the molecule to the catalysts obtained, and by operating at temperatures of from 130 to 260.degree. C and at pressures of from 2 to 70 atmospheres.