Abstract
This work deals with the liquid-phase hydrogenation of citral over Pt monometallic and PtSn bimetallic catalysts supported on commercial silica. Bimetallic catalysts contain different Sn/Pt molar ratio of 0.5, 1.0 and 1.5. Cyclohexane or 2-propanol were used as solvent. The catalysts were characterized by N2-physisorption, XRD, NH3-TPD, H2-chemisorption, and TPR. Both XRD and TPR results showed the formation of PtSn and Pt3Sn. The proportion of Pt–Sn alloys was related to the Sn/Pt molar ratio: the greater the Sn/Pt molar ratio, the greater the amount of PtSn alloy species. The amount of these species was related to the catalytic activity and selectivity in the hydrogenation of citral. Pt monometallic catalysts showed a high initial catalytic activity with high selectivity to citronellal. Bimetallic catalysts exhibited high activity and selectivity to unsaturated alcohols as geraniol and nerol. With cyclohexane as solvent, a greater amount of Pt3Sn species promote consecutive hydrogenations, and with a greater amount of PtSn alloy the formation of compounds related to cyclization of citronellal was observed. The results showed that using a balanced amount of species (Pt3Sn and PtSn) and 2-propanol as solvent, a synergic effect that promotes high activity and selectivity to geraniol and nerol was observed maintaining the same levels of selectivity along reaction time.
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We thank the Universidad Iberoamericana Puebla, Universidad Autónoma Metropolitana, Universidad Veracruzana and Consejo Nacional de Ciencia y Tecnología (CONACyT) for the financial support. This work is dedicated to the memory of Dr. Gustavo Pérez.
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Barrales-Cortés, C.A., Pérez-Pastenes, H., Piña-Victoria, J.C. et al. Hydrogenation of Citral on Pt/SiO2 Catalysts: Effect of Sn Addition and Type of Solvent. Top Catal 63, 468–480 (2020). https://doi.org/10.1007/s11244-020-01312-0
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DOI: https://doi.org/10.1007/s11244-020-01312-0