Spectroscopic, calorimetric, and catalytic evidences of hydrophobicity on Ti-MCM-41 silylated materials for olefin epoxidations
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Título: | Spectroscopic, calorimetric, and catalytic evidences of hydrophobicity on Ti-MCM-41 silylated materials for olefin epoxidations |
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Autor/es: | Silvestre-Albero, Joaquín | Domine, Marcelo E. | Jordá, José L. | Navarro, María T. | Rey, Fernando | Rodríguez Reinoso, Francisco | Corma, Avelino |
Grupo/s de investigación o GITE: | Materiales Avanzados |
Centro, Departamento o Servicio: | Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales |
Palabras clave: | Hydrophobic materials | Ti-MCM-41 catalyst | Silylation treatment | Immersion calorimetry | Catalytic epoxidation |
Área/s de conocimiento: | Química Inorgánica |
Fecha de publicación: | 25-oct-2015 |
Editor: | Elsevier |
Cita bibliográfica: | Applied Catalysis A: General. 2015, 507: 14-25. doi:10.1016/j.apcata.2015.09.029 |
Resumen: | Hydrophobic Ti-MCM-41 samples prepared by post-synthesis silylation treatment demonstrate to be highly active and selective catalysts in olefins epoxidation by using organic hydroperoxides as oxidizing agents in liquid phase reaction systems. Epoxide yields show important enhancements with increased silylation degrees of the Ti-mesoporous samples. Catalytic studies are combined and correlated with spectroscopic techniques (e.g. XRD, XANES, UV-Visible, 29Si MAS-NMR) and calorimetric measurements to better understand the changes in the surface chemistry of Ti-MCM-41 samples due to the post-synthesis silylation treatment and to ascertain the role of these trimethylsilyl groups incorporated in olefin epoxidation. In such manner, the effect of the organic moieties on solids, and both water and glycol molecules contents on the catalytic activity and selectivity are analyzed in detail. Results show that the hydrophobicity level of the samples is responsible for the decrease in water adsorption and, consequently, the negligible formation of the non-desired glycol during the catalytic process. Thus, catalyst deactivation by glycol poisoning of Ti active sites is greatly diminished, this increasing catalyst stability and leading to practically quantitative production of the corresponding epoxide. The extended use of these hydrophobic Ti-MCM-41 catalysts together with organic hydroperoxides for the highly efficient and selective epoxidation of natural terpenes is also exemplified. |
Patrocinador/es: | The authors gratefully acknowledge financial support of Spanish Government (MAT2012-38567-C02-01, Consolider-Ingenio 2010-Multicat CSD-2009-00050 and Severo Ochoa SEV-2012-0267) and Generalitat Valenciana (Project Prometeo). M.E.D. also thanks funds from Spanish Government (CTQ-2011-27550) and CSIC (PIE 200980I063). J.S.A. and F.R.R. acknowledge financial support from MINECO (Projects MAT2013-45008-p and CONCERT Project-NASEMS (PCIN-2013-057), and from Generalitat Valenciana (PROMETEO2009/002). |
URI: | http://hdl.handle.net/10045/50005 |
ISSN: | 0926-860X (Print) | 1873-3875 (Online) |
DOI: | 10.1016/j.apcata.2015.09.029 |
Idioma: | eng |
Tipo: | info:eu-repo/semantics/article |
Derechos: | © 2015 Elsevier B.V. |
Revisión científica: | si |
Versión del editor: | http://dx.doi.org/10.1016/j.apcata.2015.09.029 |
Aparece en las colecciones: | INV - LMA - Artículos de Revistas |
Archivos en este ítem:
Archivo | Descripción | Tamaño | Formato | |
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2015_Silvestre_etal_ApCatA_final.pdf | Versión final (acceso restringido) | 935,27 kB | Adobe PDF | Abrir Solicitar una copia |
2015_Silvestre_etal_ApCatA_accepted.pdf | Accepted Manuscript (acceso abierto) | 502,83 kB | Adobe PDF | Abrir Vista previa |
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