Selective hydrogenation of citral toward unsaturated alcohols on PdSn catalysts supported on mesoporous silicaMourad Bidaoui, Catherine Especel, Smain Sabour, Lakhdar Benatallah, Naima Bouchenafa-Saib, Sébastien Royer, and Ourida Mohammedi Faculty of Science and Technology, Tissemsilt University, Tissemsilt, Algeria
E-mail: bidaoui_m@yahoo.fr Received: 23 August 2024 Accepted: 29 November 2024 Abstract: The selective hydrogenation of citral to unsaturated alcohols was studied on x%Sn–Pd/CMI-1 catalysts (x in the range 0–3 wt%) synthesized by co-impregnation on an organized mesoporous silica of high specific surface area. The characteristics of the prepared catalysts were evaluated by chemical analysis, X-ray diffraction, nitrogen physisorption, transmission electron microscopy and temperature-programmed reduction, and from the activity for the model reaction of cyclohexane dehydrogenation. The existence of an interaction between Pd and Sn on the bimetallic catalysts was deduced, with the formation of a hexagonal Pd3Sn2 alloy. The catalytic performances were evaluated for the citral hydrogenation performed at 130 °C, under 76 bar hydrogen pressure, in liquid phase (isopropanol as solvent). The addition of Sn to Pd led to a decrease in the citral conversion accompanied by an increase in the selectivity to unsaturated alcohols, this phenomenon being explained by the decrease in the number of active Pd species on the surface of the catalysts and the presence of Pd3Sn2 alloy which activates the C=O bond of citral. A maximum value of 72% for the unsaturated alcohols selectivity was reached with the bimetallic 2%SnPd/CMI-1 catalyst with a citral conversion around 75% at the end of reaction time. Graphical abstract Keywords: CMI-1 mesoporous material; Citral hydrogenation; Bimetallic catalyst; Pd; Sn Full paper is available at www.springerlink.com. DOI: 10.1007/s11696-024-03840-5
Chemical Papers 79 (2) 1063–1075 (2025) |
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