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Guerbet condensation of methanol with n-propanol to isobutyl alcohol over heterogeneous copper chromite/Mg–Al mixed oxides catalysts |
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| Authors: | Carlo Carlini Cristina Flego Mario Marchionna Marilena Noviello Anna Maria Raspolli Galletti Glauco Sbrana Francesco Basile Angelo Vaccari |
| Institution: | a Dipartimento di Chimica e Chimica Industriale, University of Pisa, Via Risorgimento 35, 56126, Pisa, Italy b EniTecnologie S.p.A., Via Maritano 26, 20097 San Donato Milanese MI, Italy c Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126, Pisa, Italy d Dipartimento di Chimica Industriale e dei Materiali, ALMA MATER STUDIORUM, University of Bologna, Viale del Risorgimento 4, 40136, Bologna, Italy |
| Abstract: | The synthesis of isobutyl alcohol (iBuOH) from methanol (MeOH) and n-propanol (PrOH) through the Guerbet condensation has been studied at 200 °C and under inert atmosphere (3.0 MPa of N2), using a two-component heterogeneous catalytic system based on pre-activated copper chromite and Mg–Al mixed oxides deriving from hydrotalcite-type (HT) precursors with different Mg/Al ratios. All the investigated catalysts displayed a significant activity, with an almost complete selectivity to iBuOH. Unlike the copper chromite/soluble sodium methoxide system, the catalysts were tolerant of the co-produced water and did not display any appreciable deactivation during the course of the reaction. The catalyst productivity was found to increase by reducing the Mg/Al ratio in the heterogeneous base, according to the increase of the fraction of medium–strong and strong basic sites which favour the aldol condensation between the aldehydes derived from MeOH and PrOH. |
| Keywords: | Guerbet reaction Hydrotalcite Copper chromite Mg/Al mixed oxides Isobutyl alcohol Methanol n-Propanol Aldol condensation |
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