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dc.contributor.advisorCardona-Martínez, Nelson
dc.contributor.authorHortal-Sánchez, Isabel
dc.date.accessioned2019-08-12T15:43:46Z
dc.date.available2019-08-12T15:43:46Z
dc.date.issued2019-07-10
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2501
dc.description.abstractThe incorporation of Sn, Hf and Zr in the structure of Beta zeolite using a post-synthetic method gives catalysts with Lewis acidity that are effective for the conversion of C6 sugars to alpha-hydroxy acids (AHAs), such as lactic acid. Sn-Beta zeolite with a Si/Sn of 561 has the best catalytic performance both in water and in a 9:1 mixture of gamma-valerolactone (GVL) and water. The use of GVL as cosolvent with water improves the activity, selectivity and stability of the catalysts for the conversion of C6 carbohydrates to AHAs. Glucose conversion in GVL:water 9:1 is a viable pathway for AHAs production. The use of toluene at room temperature is an effective method for the extraction of the products from GVL. At room temperature the combination forms a bi-phasic solvent system giving an organic phase rich in GVL and toluene and an aqueous phase rich in AHAs and water.en_US
dc.description.sponsorshipThanks to the NSF EPSCoR Center for a Sustainable Water, Energy, and Food Nexus (SusWEF) (OIA-1632824) for supporting my studies during these years.en_US
dc.language.isoenen_US
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/us/*
dc.subjectCatalysisen_US
dc.subjectGamma-Valerolactoneen_US
dc.subjectBiomassen_US
dc.subjectCarbohydratesen_US
dc.subjectBeta-Zeolitesen_US
dc.subject.lcshZeolite catalystsen_US
dc.subject.lcshCatalystsen_US
dc.subject.lcshCarbohydratesen_US
dc.subject.lcshAlpha hydroxy acidsen_US
dc.subject.lcshLewis acidsen_US
dc.subject.lcshLactonesen_US
dc.subject.lcshSolventsen_US
dc.titleConversion of carbohydrates to alpha-hydroxy-acids over Lewis acidic HF-, SN- and ZR- beta zeolite catalysts using gamma-valerolactone and water as solventen_US
dc.typeThesisen_US
dc.rights.holder(c) 2019 Isabel Hortal Sanchezen_US
dc.contributor.committeeHernández-Maldonado, Arturo J.
dc.contributor.committeePagán-Torres, Yomaira
dc.contributor.representativeMathanker, Sunil K.
thesis.degree.levelM.S.en_US
thesis.degree.disciplineChemical Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Chemical Engineeringen_US
dc.description.graduationSemesterSummeren_US
dc.description.graduationYear2019en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

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Attribution-NonCommercial-NoDerivs 3.0 United States
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