Catalytic Dehydration of Glycerol to Acrolein over a Catalyst of Pd/LaY Zeolite and Comparison with the Chemical Equilibrium
| Autor: | Tamara Vázquez, Juan Navarrete, Beatriz Zeifert, J. Salmones, Diana Carolina García, J.L. Contreras, Carlos Tapia, Israel Pala Rosas |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Inorganic chemistry
02 engineering and technology glycerol 010402 general chemistry lcsh:Chemical technology 01 natural sciences Catalysis lcsh:Chemistry chemistry.chemical_compound Pyridine Glycerol lcsh:TP1-1185 Physical and Theoretical Chemistry Zeolite Pd/LaY catalyst chemical equilibrium Chemistry acrolein Acrolein 021001 nanoscience & nanotechnology acetol 0104 chemical sciences Dehydration reaction lcsh:QD1-999 Yield (chemistry) Methanol 0210 nano-technology |
| Zdroj: | Catalysts, Vol 7, Iss 3, p 73 (2017) Catalysts; Volume 7; Issue 3; Pages: 73 |
| ISSN: | 2073-4344 |
| Popis: | Glycerol dehydration to acrolein was studied with three catalysts using zeolite-Y. This zeolite in its protonic form (HY), with La (LaY) and Pd with La (Pd/LaY), was characterized by X-ray diffraction (XRD), Fourier-transform-infrared spectroscopy (FTIR) with pyridine, BET, Scanning Electron Microscope (SEM)–Energy-Dispersive Spectroscopy X-ray (EDS) and the catalytic activity tests were carried out under H2 atmosphere. It was found that La ions exchanged in the zeolite-Y resulted in the improvement of both glycerol conversion and yield to acrolein, also a relatively constant glycerol conversion was achieved up to three hours, due to the presence of Pd on the catalyst and H2 in the feed. The comparison of the calculated and experimental yields obtained from the catalytic tests of the Pd/LaY catalyst indicates a greater activity for the reaction to acrolein than for the reaction to acetol. The calculated equilibrium yields of the dehydration reaction from glycerol to acrolein, acetol, ethanal, methanol, and water and the experimental yields of a Pd/LaY catalyst were compared. Thermodynamically, a complete conversion of glycerol can be achieved since the general system remains exothermic and promotes the path to acetol below 480 K. Above this temperature the system consumes energy and favors the production of acrolein, reaching its maximum concentration at 600 K. |
| Databáze: | OpenAIRE |
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