Articles producció científica> Química Física i Inorgànica

Effect of the preparation conditions on the catalytic activity of calcined Ca/Al-layered double hydroxides for the synthesis of glycerol carbonate

  • Dades identificatives

    Identificador: PC:3200
    Autors:
    Salagre, P.Granados-Reyes, J.Cesteros, Y.
    Resum:
    The effect of the preparation conditions of several calcined Ca/Al layered double hydroxide compounds (CaAl-LDH) on the catalytic transesterification of glycerol with dimethyl carbonate to obtain glycerol carbonate has been studied. The CaAl-LDH precursors were prepared by aging under microwaves or conventional heating, and using chlorides or nitrates as interlayer anions. Calcination conditions, such as temperature, time and calcination system, were modified. After 3 h of reaction, the catalysts obtained by calcination at 450 ºC for 15 h in air exhibited moderate-high glycerol conversion (46-76%) and moderate selectivity to glycerol carbonate (41-65%). Calcination at 450 ºC at longer calcination time or the use of a dynamic inert-atmosphere system during calcination led to higher conversion (89-94%) and higher selectivity to glycerol carbonate (72-73%). This has been related to the higher basicity of these catalysts. Finally, calcination at 750 ºC resulted in high conversion (88-98%) and high selectivity to glycerol carbonate (60-85%) due to the presence in the catalysts of highly basic CaO. Several catalytic reuses favoured the decarboxylation of glycerol carbonate resulting in the formation of higher amounts of glycidol (42%). The progressive loss of conversion and selectivity to glycerol carbonate observed has been attributed to the loss of some CaO basic centres during reaction.
  • Altres:

    Autor segons l'article: Salagre, P.; Granados-Reyes, J.; Cesteros, Y.
    Departament: Química Física i Inorgànica
    Autor/s de la URV: SALAGRE CARNERO, MARÍA PILAR; Granados-Reyes, J.; CESTEROS FERNÁNDEZ, YOLANDA
    Paraules clau: Calcined CaAl-LDH Glycerol Glycerol carbonate
    Resum: The effect of the preparation conditions of several calcined Ca/Al layered double hydroxide compounds (CaAl-LDH) on the catalytic transesterification of glycerol with dimethyl carbonate to obtain glycerol carbonate has been studied. The CaAl-LDH precursors were prepared by aging under microwaves or conventional heating, and using chlorides or nitrates as interlayer anions. Calcination conditions, such as temperature, time and calcination system, were modified. After 3 h of reaction, the catalysts obtained by calcination at 450 ºC for 15 h in air exhibited moderate-high glycerol conversion (46-76%) and moderate selectivity to glycerol carbonate (41-65%). Calcination at 450 ºC at longer calcination time or the use of a dynamic inert-atmosphere system during calcination led to higher conversion (89-94%) and higher selectivity to glycerol carbonate (72-73%). This has been related to the higher basicity of these catalysts. Finally, calcination at 750 ºC resulted in high conversion (88-98%) and high selectivity to glycerol carbonate (60-85%) due to the presence in the catalysts of highly basic CaO. Several catalytic reuses favoured the decarboxylation of glycerol carbonate resulting in the formation of higher amounts of glycidol (42%). The progressive loss of conversion and selectivity to glycerol carbonate observed has been attributed to the loss of some CaO basic centres during reaction.
    Grup de recerca: Materials Catalítics en Química Verda
    Àrees temàtiques: Química Química Chemistry
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 0926-860X
    Identificador de l'autor: 0000-0003-3257-2022; ; 0000-0002-5439-9358
    Data d'alta del registre: 2018-03-15
    Pàgina final: 17
    Volum de revista: 536
    Versió de l'article dipositat: info:eu-repo/semantics/submittedVersion
    Enllaç font original: https://www.sciencedirect.com/science/article/pii/S0926860X17300686
    Programa de finançament: plan; CTQ2011-24610
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI de l'article: 10.1016/j.apcata.2017.02.013
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2017
    Pàgina inicial: 9
    Tipus de publicació: Article Artículo Article
  • Paraules clau:

    Glicerina
    Catàlisi
    Calcined CaAl-LDH
    Glycerol
    Glycerol carbonate
    Química
    Química
    Chemistry
    0926-860X
  • Documents:

  • Cerca a google

    Search to google scholar