Articles producció científica> Enginyeria Química

Role of the synthesis route on the properties of hybrid LDH-graphene as basic catalysts

  • Identification data

    Identifier: PC:2488
    Authors:
    Mayra G. ÁlvarezDidier TichitFrancesc MedinaJordi Llorca
    Abstract:
    DOI: 10.1016/j.apsusc.2016.11.037 URL: http://www.sciencedirect.com/science/article/pii/S0169433216323959 Filiació URV: SI Inclòs a la memòria: SI
  • Others:

    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
    Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S0169433216323959?via%3Dihub
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Article's DOI: 10.1016/j.apsusc.2016.11.037
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    First page: 821
    Publication Type: Article Artículo Article
  • Keywords:

    Catàlisi heterogènia
    Grafè
    graphene
    graphene oxide
    Hydrotalcite
    Enginyeria química
    Ingeniería química
    Chemical engineering
    0169-4332
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