Articles producció científica> Química Física i Inorgànica

Influence of acid-base properties of calcined MgAl and CaAl layered double hydroxides on the catalytic glycerol etherification to short-chain polyglycerols

  • Identification data

    Identifier: imarina:9242030
    Authors:
    Perez-Barrado, ElenaCinta Pujol, MariaAguilo, MagdalenaLlorca, JordiCesteros, YolandaDiaz, FrancescPallares, JosepMarsal, Lluis FSalagre, Pilar
    Abstract:
    Several MgAl-LDHs (HT) and CaAl-LDHs (HC) were synthesized in different conditions and later calcined at 723 K, resulting in catalysts (cHT and cHC), with different acid base properties. Calcined samples were tested in the etherification reaction of glycerol towards short-chain oligomers (di- to pentaglycerol). All catalysts were characterised by XRPD, ICP, N-2,physisorption and TEM techniques. The basicity was evaluated using the CO2-TPD technique and the acidity by cyclohexylamine adsorption. Catalytic results were correlated with catalysts properties. Catalysts with higher acidity showed higher conversion (96% for a cHT and 75% for a cHC) but also higher selectivity to other products, with main contribution of acrolein (88% for a cHT and 58% for a cHC). In contrast, catalysts with lower acidity resulted in lower conversion (24% for a cHT and 40% for a cHC) but higher selectivity towards di- and triglycerol (100% and 64%, respectively). The formation of triglycerol and other low-weight polyglycerols (tetra- and pentaglycerol) was favoured in catalysts with low acidity and strong basic sites. When the temperature of calcination was raised to 1073 K for one cHC, the acidity decreased and the number of strong basic sites increased, resulting in higher selectivity to triglycerol (20%), the formation of tetra- and pentaglycerol (15% and 6%, respectively) and the decrease of the acrolein amount. (C) 2014 Elsevier B.V. All rights reserved.
  • Others:

    Author, as appears in the article.: Perez-Barrado, Elena; Cinta Pujol, Maria; Aguilo, Magdalena; Llorca, Jordi; Cesteros, Yolanda; Diaz, Francesc; Pallares, Josep; Marsal, Lluis F; Salagre, Pilar
    Department: Enginyeria Electrònica, Elèctrica i Automàtica Química Física i Inorgànica
    URV's Author/s: Aguiló Díaz, Magdalena / Cesteros Fernández, Yolanda / Díaz González, Francisco Manuel / Marsal Garví, Luis Francisco / Pallarès Marzal, Josep / Pujol Baiges, Maria Cinta / Salagre Carnero, María Pilar
    Keywords: Short-chain polyglycerol Selective etherification Renewable resources Porosity Mgal layered double hydroxides Mesoporous catalysts Hydrotalcites Hydrocalumite Glycerol etherification Diglycerol Diffraction Derivatives Caal layered double hydroxides Basicity Acid-base properties
    Abstract: Several MgAl-LDHs (HT) and CaAl-LDHs (HC) were synthesized in different conditions and later calcined at 723 K, resulting in catalysts (cHT and cHC), with different acid base properties. Calcined samples were tested in the etherification reaction of glycerol towards short-chain oligomers (di- to pentaglycerol). All catalysts were characterised by XRPD, ICP, N-2,physisorption and TEM techniques. The basicity was evaluated using the CO2-TPD technique and the acidity by cyclohexylamine adsorption. Catalytic results were correlated with catalysts properties. Catalysts with higher acidity showed higher conversion (96% for a cHT and 75% for a cHC) but also higher selectivity to other products, with main contribution of acrolein (88% for a cHT and 58% for a cHC). In contrast, catalysts with lower acidity resulted in lower conversion (24% for a cHT and 40% for a cHC) but higher selectivity towards di- and triglycerol (100% and 64%, respectively). The formation of triglycerol and other low-weight polyglycerols (tetra- and pentaglycerol) was favoured in catalysts with low acidity and strong basic sites. When the temperature of calcination was raised to 1073 K for one cHC, the acidity decreased and the number of strong basic sites increased, resulting in higher selectivity to triglycerol (20%), the formation of tetra- and pentaglycerol (15% and 6%, respectively) and the decrease of the acrolein amount. (C) 2014 Elsevier B.V. All rights reserved.
    Thematic Areas: Química Odontología Medicina veterinaria Materiais Interdisciplinar Industrial and manufacturing engineering General chemistry General chemical engineering Farmacia Environmental chemistry Ensino Engineering, environmental Engineering, chemical Engineering (miscellaneous) Engenharias iv Engenharias iii Engenharias ii Engenharias i Economia Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemistry (miscellaneous) Chemistry (all) Chemical engineering (miscellaneous) Chemical engineering (all) Biotecnología Biodiversidade Astronomia / física Administração pública e de empresas, ciências contábeis e turismo
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: josep.pallares@urv.cat magdalena.aguilo@urv.cat mariacinta.pujol@urv.cat yolanda.cesteros@urv.cat lluis.marsal@urv.cat f.diaz@urv.cat
    Author identifier: 0000-0001-7221-5383 0000-0001-6130-9579 0000-0002-1052-8031 0000-0002-5439-9358 0000-0002-5976-1408 0000-0003-4581-4967
    Record's date: 2024-10-12
    Papper version: info:eu-repo/semantics/acceptedVersion
    Link to the original source: https://www.sciencedirect.com/science/article/abs/pii/S138589471401585X
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Chemical Engineering Journal. 264 547-556
    APA: Perez-Barrado, Elena; Cinta Pujol, Maria; Aguilo, Magdalena; Llorca, Jordi; Cesteros, Yolanda; Diaz, Francesc; Pallares, Josep; Marsal, Lluis F; Salag (2015). Influence of acid-base properties of calcined MgAl and CaAl layered double hydroxides on the catalytic glycerol etherification to short-chain polyglycerols. Chemical Engineering Journal, 264(), 547-556. DOI: 10.1016/j.cej.2014.11.117
    Article's DOI: 10.1016/j.cej.2014.11.117
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2015
    Publication Type: Journal Publications
  • Keywords:

    Chemical Engineering (Miscellaneous),Chemistry (Miscellaneous),Engineering (Miscellaneous),Engineering, Chemical,Engineering, Environmental,Environmental Chemistry,Industrial and Manufacturing Engineering
    Short-chain polyglycerol
    Selective etherification
    Renewable resources
    Porosity
    Mgal layered double hydroxides
    Mesoporous catalysts
    Hydrotalcites
    Hydrocalumite
    Glycerol etherification
    Diglycerol
    Diffraction
    Derivatives
    Caal layered double hydroxides
    Basicity
    Acid-base properties
    Química
    Odontología
    Medicina veterinaria
    Materiais
    Interdisciplinar
    Industrial and manufacturing engineering
    General chemistry
    General chemical engineering
    Farmacia
    Environmental chemistry
    Ensino
    Engineering, environmental
    Engineering, chemical
    Engineering (miscellaneous)
    Engenharias iv
    Engenharias iii
    Engenharias ii
    Engenharias i
    Economia
    Ciências biológicas iii
    Ciências biológicas ii
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Ciência de alimentos
    Chemistry (miscellaneous)
    Chemistry (all)
    Chemical engineering (miscellaneous)
    Chemical engineering (all)
    Biotecnología
    Biodiversidade
    Astronomia / física
    Administração pública e de empresas, ciências contábeis e turismo
  • Documents:

  • Cerca a google

    Search to google scholar