TAILIEUCHUNG - Characterization and deactivation of sulfided red mud used as hydrogenation catalyst

Abstract Red mud is a residue in the production of alumina by the Bayer process. It contains oxides of iron and titanium, and has been shown to be active in sulfided form as hydrogenation catalyst. The evolution of sulfided red mud activity and selectivity with reaction time was studied for the hydrogenation of a light fraction of an anthracene oil. | ELSEVIER Applied Catalysis A General 128 1995 259-273 B APPLIED CATALYSIS A GENERAL Characterization and deactivation of sulfided red mud used as hydrogenation catalyst Jorge Alvarez Roberto Rosal Herminio Sastre Fernando V. Diez Department of Chemical Engineering University of Oviedo 33071-Oviedo Spain Received 26 January 1995 revised 29 March 1995 accepted 29 March 1995 Abstract Red mud is a residue in the production of alumina by the Bayer process. It contains oxides of iron and titanium and has been shown to be active in sulfided form as hydrogenation catalyst. The evolution of sulfided red mud activity and selectivity with reaction time was studied for the hydrogenation of a light fraction of an anthracene oil. Texture morphology and composition of fresh red mud and catalyst samples collected at different reaction times were characterized by nitrogen adsorption SEM and SEM-EDX. It was found that the catalyst looses surface area and superficial iron as the reaction proceeds. The decrease of catalytic activity can be explained by a combination of both phenomena. Keywords Red mud Deactivation Hydrogenation Scanning electron microscopy 1. Introduction Red mud is a material containing mainly oxides of iron aluminium titanium silicon calcium and sodium and is produced as a residue in the manufacture of alumina by the Bayer process. Sulfided red mud was found to be active as a hydrogenation catalyst as early as 1950 1 . Further studies showed the catalytic activity of sulfided red mud for the liquefaction of coal 2-4 biomass 5 and for the hydrogenation of pure organic compounds such as naphthalene phenanthrene and pyrene 4 6 . In a previous work 7 sulfided red mud was tested as a catalyst for the hydrogenation of anthracene oil a fraction obtained by distillation of coal tar containing two- to four-rings condensed aromatic hydrocarbons. These compounds can transform into hydroaromatics by catalytic hydrogenation yielding a hydrogenated Corresponding author. E-mail .

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