Process for treating hydrocarbonaceous material using catalysts made from a new aluminum trihydroxide phase

A process for treating a hydrocarbonaceous material comprising contacting said hydrocarbonaceous material with a catalyst composition comprising a support produced from an aluminum trihydroxide phase having measurable X-ray diffraction peaks between about 2θ=18.15° and about 2θ=18.50°, between about 2θ=36.1° and about 2θ=36.85°between about 2θ=39.45° and about 2θ=40.30°, and between about 2θ=51.48° and about 2θ=52.59°, and a catalytically active amount of metals.