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Investigation into discrete molecular catalysts for biomass conversion into 5-hydroxymethylfurfural

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dc.contributor.authorDunn, Eric F., author
dc.contributor.authorChen, Eugene X.-Y., advisor
dc.contributor.authorFinke, Richard G., committee member
dc.contributor.authorBjostad, Louis B., committee member
dc.date.accessioned2007-01-03T05:55:15Z
dc.date.available2007-01-03T05:55:15Z
dc.date.issued2013
dc.description.abstractAs part of ongoing research into the conversion of biomass into the platform chemical 5-hydroxymethylfurfural (HMF), two primary investigations have been performed. The first is an exploration of discrete lanthanide complexes as possible catalysts for the conversion of glucose to HMF. Catalysts of the type Ln(HMDS)3, Ln(MeTMS)3, and Ln(OTf)3 have been examined in ionic liquid (IL) for their performance in the glucose-to-HMF conversion. In this study Sc(OTf)3 has been identified as a good catalyst for both glucose (up to 38% HMF yield) and cellulose (up to 19% HMF yield) conversions. The second investigation was concerned with the effect of N-heterocyclic carbenes (NHCs) on the biomass conversion system that containing IL solvents. Since NHC's can be readily formed from deprotonation of ILs, there exists in the literature the hypothesis that an NHC-CrClx complex is the true catalyst in these conversion systems. Three sets of experiments are reported herein to test this hypothesis: controls with all additives used by previous investigations purporting an NHC effect, tests of in situ generated and discrete preformed NHC-Cr complexes suggested by the hypothesis, and quantitative NHC titration (poisoning) experiments. The combined evidence shows conclusively that the NHC ligand actually serves as a poison to the chromium catalyst system and that a superstoichiometric amount (2 or 3 equiv) of NHC ligand can completely shut down the catalysis.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierDunn_colostate_0053N_11946.pdf
dc.identifier.urihttp://hdl.handle.net/10217/80234
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subject5-hydroxymethylfurfural
dc.subjectbiomass
dc.subjectchromium
dc.subjectglucose
dc.subjectIonic liquids
dc.subjectN-heterocyclic carbene
dc.titleInvestigation into discrete molecular catalysts for biomass conversion into 5-hydroxymethylfurfural
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineChemistry
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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