Catalyst for alkylating a C4-C5 isoparaffin with at least a C3-C6 olefin

摘要

Catalyst including silica and an acidic phase comprising sulphuric acid and the compound HB(HSO4)4, the silica having been impregnated with the said acidic phase, the said catalyst being such that it consists essentially of particles with a mean diameter of between 0.1 and 30 mu m, such that, before it is impregnated with the said acidic phase, the silica has a total pore volume of between 0.1 and 0.6 cm<3>/g, and such that the said acidic phase includes between 0.4 % and 68.8 % by weight of the compound HB(HSO4)4 and between 31.2 % and 99.6 % by weight of the compound H2SO4, the said acidic phase being characterised in that it does not contain any sulphur trioxide or boric acid. The invention also relates to the preparation and use of the said catalyst in catalytic alkylation of isobutane and/or isopentane in the presence of at least one olefin containing from 3 to 6 carbon atoms per molecule.