An aromatic saturation process is catalyzed under relatively low pressure conditions in the presence of a halide-containing compound. Additive fluoride-containing compounds can be injected into the feedstock just prior to contact of the feedstock with either a fluoride or nonfluoride-containing catalyst. Also, a catalyst utilized in the invention contains Group VIB and/or Group VIII hydrogenation metals, phosphorus and fluoride supported on an amorphous, porous refractory oxide and has a narrow pore size distribution.