Patent ID: 7790019

Claim:
Catalyst including at least one hydro-dehydrogenating element chosen from the group formed by the group VIB and group VIII elements of the periodic table and a substrate based on at least one zeolite and based on a silica-alumina matrix, said matrix containing a quantity greater than 5% by weight and less than or equal to 95% by weight of silica (SiO 2 ), said catalyst having the following characteristics: a mean pore diameter, measured by mercury porosimetry, of between 20 and 140Å, a pore distribution such that the ratio between the volume V2, measured by mercury porosimetry, comprised between D mean −30 Å and D mean +30 Å to the total volume measured by mercury porosimeter intrusion, is more than 0.6− the volume V3, measured by mercury porosimetry, contained in the pores with diameters greater than D mean +30 Å, is less than 0.1 ml/g—the volume V6, measured by mercury porosimetry, contained in the pores with diameters greater than D mean +15 Å, is less than 0.2 ml/g, a total pore volume, measured by mercury porosimetry, comprised between 0.2 ml/g and 0.5 ml/g, a total pore volume, measured by nitrogen porosimetry, comprised between 0.2 ml/g and 0.5 ml/g, a BET specific surface area comprised between 100 and 600 m 2 /g, a pore volume, measured by mercury porosimetry, contained in the pores with diameters of more than 140 Å, of less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, contained in the pores with diameters of more than 160 Å, of less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, contained in the pores with diameters of more than 200 Å, of less than 0.1 ml/g, a pore volume, measured by mercury porosimetry, contained in the pores with diameters of more than 500 Å, of less than 0.01 ml/g, a packing density of the catalysts greater than 0.85 g/cm 3 , an X-ray diffraction diagram which contains at least the main lines characteristic of at least one of the transition aluminas that are included in the group composed of alpha, rho, chi, eta, gamma, kappa, theta and delta aluminas.