Control of the Basicity in Ni–MgO Systems: Influence in the Hydrogenation of Styrene Oxide |
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Authors: | Olga Bergadà Pilar Salagre Yolanda Cesteros Francisco Medina Jesús E Sueiras |
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Affiliation: | 1. Facultat de Química, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain 2. Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007, Tarragona, Spain 3. Escola Tècnica Superior d’Enginyeria Química, Universitat Rovira i Virgili, Av. Pa?sos Catalans, 26, 43007, Tarragona, Spain
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Abstract: | The addition of basic solutions to the reaction medium in the catalytic hydrogenation of styrene oxide improves the selectivity
to 2-phenylethanol (used in perfumery) but also can favour condensation reactions. To study the influence of different basic
sites on the reaction products, we prepared several catalysts by mixing a commercial magnesia (MgO), and other previously
rehydrated (MgOr), with different amounts of NiO followed by reduction (NiMgO, 4NiMgO, NiMgOr, 4NiMgOr), and by mixing directly
MgO with Ni (NiMgOa, 4NiMgOa). Ni–MgO catalysts showed the best conversion and selectivity to 2-phenylethanol values, arriving
to 100% when increasing the MgO content. Interestingly, CO2-TPD study of catalyst NiMgO indicates that metallic nickel covers the weakest basic sites of magnesia. On the other hand,
CO2-TPD profiles of Ni–MgOr and Ni–MgOa catalysts, which present low catalytic activity, showed an important amount of available
basic sites that favour the formation of higher amounts of condensation products, which are responsible for the catalyst deactivation. |
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Keywords: | Basicity Styrene oxide hydrogenation 2-Phenylethanol CO2-TPD |
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