Autor según el artículo: Alvarez, Mayra G.; Crivoi, Dana G.; Medina, Francesc; Tichit, Didier;
Departamento: Enginyeria Química
Autor/es de la URV: CRIVOI, DANA GEORGIANA / GARCÍA ALVAREZ, MAYRA / Medina Cabello, Francisco
Palabras clave: Reduced graphene oxide Nanocomposites Layered double hydroxide Hydrotalcite Claisen–schmidt condensation Base catalysts
Resumen: Layered double hydroxides (LDH) or their derived mixed oxides present marked acid-base properties useful in catalysis, but they are generally agglomerated, inducing weak accessibility to the active sites. In the search for improving dispersion and accessibility of the active sites and for controlling the hydrophilic/hydrophobic balance in the catalysts, nanocomposite materials appear among the most attractive. In this study, a series of nanocomposites composed of LDH and reduced graphene oxide (rGO), were successfully obtained by direct coprecipitation and investigated as base catalysts for the Claisen–Schmidt condensation reaction between acetophenone and benzaldehyde. After activation, the LDH-rGO nanocomposites exhibited improved catalytic properties compared to bare LDH. Moreover, they reveal great versatility to tune the selectivity through their composition and the nature or the absence of solvent. This is due to the enhanced basicity of the nanocomposites as the LDH content increases which is assigned to the higher dispersion of the nanoplatelets in comparison to bulk LDH. Lewis-type basic sites of higher strength and accessibility are thus created. The nature of the solvent mainly acts through its acidity able to poison the basic sites of the nanocatalysts.
Áreas temáticas: Engineering, chemical Engineering (miscellaneous) Engineering (all) Energy (miscellaneous) Energy (all) Chemical engineering (miscellaneous) Chemical engineering (all)
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
Direcció de correo del autor: francesc.medina@urv.cat
Identificador del autor: 0000-0002-3111-1542
Fecha de alta del registro: 2024-06-22
Versión del articulo depositado: info:eu-repo/semantics/publishedVersion
Enlace a la fuente original: https://www.mdpi.com/2305-7084/3/1/29
URL Documento de licencia: http://repositori.urv.cat/ca/proteccio-de-dades/
Referencia al articulo segun fuente origial: Chemengineering. 3 (1): 29-45
Referencia de l'ítem segons les normes APA: Alvarez, Mayra G.; Crivoi, Dana G.; Medina, Francesc; Tichit, Didier; (2019). Synthesis of Chalcone Using LDH/Graphene Nanocatalysts of Different Compositions. Chemengineering, 3(1), 29-45. DOI: 10.3390/chemengineering3010029
DOI del artículo: 10.3390/chemengineering3010029
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2019
Tipo de publicación: Journal Publications
Repositori URV