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A process is described for converting synthesis gas in the presence of a catalyst comprising at least one group VIII element dispersed on a support comprising alumina modified by aqueous impregnation of quaternary ammonium silicate and comprising in the range of about 3% by weight to about 9.5% by weight of silica. Said support can optionally also comprise at least one oxide selected from the group formed by rare earth oxides, alkaline-earth oxides and zirconium oxide.