Catalytic Deactivation of HY Zeolites in the Dehydration of Glycerol to Acrolein
| Autor: | Jennipher Pérez-Cabrera, Israel Pala-Rosas, Juan Navarrete-Bolaños, Sofía Hernández-Ramírez, J.L. Contreras, Beatriz Zeifert, J. Salmones, Ricardo López-Medina, Andrés A. Fragoso-Montes de Oca |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
glycerol dehydration
zeolite acidity Inorganic chemistry 02 engineering and technology 010402 general chemistry lcsh:Chemical technology 01 natural sciences Catalysis lcsh:Chemistry chemistry.chemical_compound micro/mesoporous zeolites Reaction rate constant Physisorption Pyridine Glycerol lcsh:TP1-1185 Lewis acids and bases Physical and Theoretical Chemistry zeolite deactivation acrolein Acrolein 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Dehydration reaction lcsh:QD1-999 HY zeolite 0210 nano-technology |
| Zdroj: | Catalysts, Vol 11, Iss 360, p 360 (2021) Catalysts Volume 11 Issue 3 |
| ISSN: | 2073-4344 |
| Popis: | The study of the deactivation of HY zeolites in the dehydration reaction of glycerol to acrolein has represented a challenge for the design of new catalysts. HY zeolites with SiO2/Al2O3 molar ratios between 3.5 and 80 were studied. The solids were characterized by XRD, N2 physisorption, SEM-EDXS, Raman and UV-vis spectroscopies, infrared spectroscopy of pyridine (FTIR-Py) and catalytic activity tests from 250 °C to 325 °C. It was found that the total amount of acid sites per unit area of catalyst decreased as the SiO2/Al2O3 molar ratio increased from 3.5 to 80, resulting in the decrease in the initial glycerol conversion. The initial acrolein selectivity was promoted with the increase of the Brønsted/Lewis acid sites ratio at any reaction temperature. The deactivation tests showed that the catalyst lifetime depended on the pore structure, improving with the presence of large surface areas as evidenced by the deactivation rate constants. The characterization of the deactivated catalysts by XRD, N2 physisorption and thermogravimetric analysis indicated that the deposition of coke resulted in the total obstruction of micropores and the partial blockage of mesopores. Moreover, the presence of large mesopores and surface areas allowed the amount of coke deposited at the catalyst surface to be reduced. |
| Databáze: | OpenAIRE |
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