Author, as appears in the article.: Mayra G. Álvarez; Didier Tichit; Francesc Medina; Jordi Llorca
Department: Enginyeria Química
URV's Author/s: GARCÍA ALVAREZ, MAYRA; Didier Tichit; MEDINA CABELLO, FRANCISCO; Jordi Llorca
Keywords: graphene graphene oxide Hydrotalcite
Abstract: Layered double hydroxides (LDH or HT) or their derived mixed oxides present marked acid-base properties useful in catalysis, but they lead to agglomerate inducing a weak accessibility to the active sites. In this study we report the preparation and characterization of HT/Graphene (HT/rGO) nanocomposites as active and selective basic catalysts for the acetone condensation reaction. The graphene high specific surface area and structural compatibility with the HT allowed increasing the number and accessibility of the active sites and activity of this later. Two series of HT/rGO nanocomposites with 0.5 ≤ HT/rGO ≤ 10 mass ratio were prepared by: i) direct HT coprecipitation in the presence of GO; ii) self-assembly of preformed HT with GO. The prepared HT/rGO nanocomposites were dried either in air at 80 °C or freeze-dried. A series of characterizations showed the great influence of the preparation method and HT/rGO mass ratio on both the nanocomposite structure and catalytic activity. An optimum activity was observed for a HT/rGO = 10 catalyst. Particularly, the highest catalytic activity was found in those nanocomposites obtained by coprecipitation and freeze dried (3 times more active than bulk HT) which can be connected to their structure with a better accessibility to the basic sites.
Research group: Catàlisi heterogènia
Thematic Areas: Enginyeria química Ingeniería química Chemical engineering
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 0169-4332
Author identifier: 0000-0002-9930-6709; n/a; 0000-0002-3111-1542; 0000-0002-7447-9582
Record's date: 2017-01-18
Last page: 831
Journal volume: 396
Papper version: info:eu-repo/semantics/acceptedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2017
First page: 821
Publication Type: Article Artículo Article
Repositori URV