Valorization of α-olefins: Double bond shift and skeletal isomerization of 1-pentene and 1-hexene on zirconia-based catalysts |
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| Authors: | Inés Coleto Rafael Roldán César Jiménez-Sanchidrián Juan P Gómez Francisco J Romero-Salguero |
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| Affiliation: | 1. Departamento de Química Orgánica, Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, Ctra. Nnal. IV, km 396, 14014 Córdoba, Spain;2. Centro de Tecnología de Repsol, Ctra. Nnal. V, km 18, 28631 Móstoles (Madrid), Spain;1. Thermochemical Processes Unit, IMDEA Energy Institute, Parque Tecnológico de Móstoles. Avenida de Ramón de la Sagra, 3. Móstoles, Madrid 28935, Spain;2. Chemical and Environmental Engineering Group, ESCET, Rey Juan Carlos University, C/Tulipán s/n, Móstoles, Madrid 28933, Spain;1. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Prospekt Akademika Lavrentieva 5, Novosibirsk 630090, Russia;2. Novosibirsk State University, Faculty of Natural Sciences, Department of Physical Chemistry, Pirogova Street 2, Novosibirsk 630090, Russia;1. Environmental Catalysis research group, Chemical Engineering Department, Engineering Faculty, Universidad de Antioquia, Calle 70 No. 52-21, Medellín, Colombia;2. Hydraulic Engineering and Environmental Research Group, Universidad Nacional de Colombia Sede Manizales, Carrera 27, 64-60, Manizales, Colombia;1. IFP Energies Nouvelles, Rond-Point de l’Echangeur de Solaize, BP 3, 69360 Solaize, France;2. Department of Physical and Theoretical Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Ilkovi?ova 6, SK-84215 Bratislava, Slovakia;3. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská cesta 9, SK-84236 Bratislava, Slovakia |
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| Abstract: | Several catalysts consisting of Pt supported on sulfated or tungstated zirconia (one of them supported on alumina) have been characterized by different techniques, such as elemental and XRD analyses, N2 adsorption, TPD of ammonia, TPR and H2 chemisorption. All these catalysts were active in the transformation of two α-olefins, 1-pentene and 1-hexene, both present in most of FCC naphthas, whose conversion to internal and branched olefins is of a great interest for their use in reformulated gasolines and as intermediate chemicals. At low reaction temperatures (200–250 °C), both hydrogenation and double bond shift compete to give n-paraffins and internal olefins, respectively. As the temperature rises (>350 °C) the catalytic activity for the isomerization reactions increases, yielding a higher amount of internal and branched olefins. The product composition depends on the particular catalyst and reaction conditions used. The high activity of the sulfated zirconia, is remarkable and clearly indicates the participation of acid sites in these reactions. |
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