Selective hydrogenation of cinnamaldehyde using Pd catalysts supported on Mg/Al mixed oxides: Influence of the Pd incorporation method |
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Authors: | María J. Martínez‐Ortiz Miguel A. de la Rosa‐Guzmán Jorge R. Vargas‐García Jorge L. Flores‐Moreno Nancy Castillo Ariel Guzmán‐Vargas Sara Morandi Rosa M. Pérez‐Gutiérrez |
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Affiliation: | 1. Instituto Politécnico Nacional‐ESIQIE. Laboratorio de Investigación en Materiales Porosos, Catálisis Ambiental y Química Fina. UPALM Edif. 7 P. B., Zacatenco, C. P. 07738, México, D. F., Mexico;2. Instituto Politécnico Nacional‐ESIQIE. Departamento de Ingeniería Metalúrgica. México 07300 DF, AP 75‐874, Mexico;3. Universidad Autónoma Metropolitana‐A, área de Química de Materiales, Avenida San Pablo No. 180, 02200 México D.F., Mexico;4. Dipartimento di Chimica and NIS, Inter‐departmental Center, Università di Torino, Via P. Giuria 7, 10125 Torino, Italy;5. Instituto Politécnico Nacional‐ ESIQIE. Laboratorio de Investigación de Productos Naturales. UPALM Edif. 7 P. B., Zacatenco, C. P. 07738, México, D. F., Mexico |
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Abstract: | A series of hydrotalcite‐like compounds was synthesized by varying Mg/Al molar ratio with values of 2, 3, and 4. After thermal treatment at 823 K, the corresponding mixed oxides were obtained and used as catalytic supports. The incorporation of a Pd metallic phase (0.5 g/g loading), was carried out by two methods: 1) in situ vapour phase thermal decomposition, and 2) impregnation by organic method. Fresh and calcined samples were characterized by XRD and N2 sorption experiments. The basic and metal functions were analyzed by CO2‐TPD and H2‐TPR. The Pd‐support interaction was studied by FTIR spectroscopy using CO as a probe molecule while the morphology of Pd nanoparticles on the catalysts was studied by SEM, HRTEM, and theoretical simulation using the Fast Fourier Transform (FFT) method. Finally, the catalytic activity results showed a higher conversion towards hydrocinnamaldehyde in the cinnamaldehyde hydrogenation reaction for the catalysts prepared by vapour phase thermal decomposition, compared with those prepared by organic method, showing the significant dependence on the catalytic activity and the Pd incorporation method. |
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Keywords: | Pd catalysts hydrotalcite cinnamaldehyde selective hydrogenation Pd nanoparticles |
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