Patent ID: 7879224

Claim:
A catalyst comprising at least one hydrodehydrogenating element selected from the group consisting of elements from group VIB and group VIII of the periodic table, 0.6% to 2.5% of phosphorus, said catalyst having a total volume pore, measured by mercury porosimetry, in the range of 0.35 to 0.74 ml/g, and a non-zeolitic support comprising alumina-silica, said alumina-silica having the following characteristics: a percentage of silica in the range of 5% to 95% by weight; a sodium content of less than 0.03% by weight; a total pore volume, measured by mercury porosimetry, in the range of 0.45 to 0.96 ml/g; a porosity such that: i) the volume of mesopores with a diameter in the range of 40 Å to 150 Å and with a mean pore diameter in the range of 80 Å to 140 Å represents 40-70% of the total pore volume measured by mercury porosimetry; ii) the volume of macropores with a diameter of more than 500 Å represents 30-60% of the total pore volume measured by mercury porosimetry; a BET specific surface area in the range of 100 to 550 m 2 /g; an X ray diffraction diagram which contains at least the principal characteristic peaks of at least one of the transition aluminas included in the group composed of alpha, rho, khi, eta, gamma, kappa, theta and delta aluminas.