Catalysts for water dealkylation of aromatic hydrocarbons

摘要

A water dealkylation catalyst of aromatic hydrocarbons containing at least one metal of Group VIII and eventually, one metal of group VIIb deposited on a gamma alumina of special properties containing at least 1000 ppm of sulfate ions having undergone a pre-treatment in aqueous medium at a pH between 1 and 10 at a temperature below 100 DEG C. The catalysts contain rhodium on pre-treated gamma alumina and the bimetallic catalysts contain 2 metals of the group VIII or one metal of the group VII and one metal of the group VIIb on pre-treated gamma alumina.