Show simple item record

dc.contributor.authorPerez Barrado, Elena
dc.contributor.authorCinta Pujol, Maria
dc.contributor.authorAguilo, Magdalena
dc.contributor.authorLlorca Piqué, Jordi
dc.contributor.authorCesteros, Yolanda
dc.contributor.authorDiaz, Francesc
dc.contributor.authorPallarès Marzal, Josep
dc.contributor.authorMarsal Garví, Lluis
dc.contributor.authorSalagre, Pilar
dc.contributor.otherUniversitat Politècnica de Catalunya. Institut de Tècniques Energètiques
dc.identifier.citationPerez, E., Cinta, M., Aguilo, M., Llorca, J., Cesteros, Y., Diaz, F., Pallarès, J., Marsal, L., Salagre, P. 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", 15 Març 2015, vol. 264, p. 547-556.
dc.description.abstractSeveral 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.
dc.format.extent10 p.
dc.subjectÀrees temàtiques de la UPC::Enginyeria química::Indústria dels processos químics
dc.subject.otherGlycerol etherification
dc.subject.otherShort-chain polyglycerol
dc.subject.otherCaAl layered double hydroxides
dc.subject.otherMgAl layered double hydroxides
dc.subject.otherAcid-base properties
dc.titleInfluence of acid-base properties of calcined MgAl and CaAl layered double hydroxides on the catalytic glycerol etherification to short-chain polyglycerols
dc.contributor.groupUniversitat Politècnica de Catalunya. NEMEN - Nanoenginyeria de materials aplicats a l'energia
dc.rights.accessOpen Access
dc.description.versionPostprint (published version)
upcommons.citation.authorPerez, E.; Cinta, M.; Aguilo, M.; Llorca, J.; Cesteros, Y.; Diaz, F.; Pallarès, J.; Marsal, L.; Salagre, P.
upcommons.citation.publicationNameChemical engineering journal

Files in this item


This item appears in the following Collection(s)

Show simple item record

Except where otherwise noted, content on this work is licensed under a Creative Commons license: Attribution-NonCommercial-NoDerivs 3.0 Spain