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In-situ 13C CM-MAS NMR study of dilute acid biomass pretreatment on 13C enriched poplar wood

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dc.contributor.authorKohn, Benjamin D., author
dc.contributor.authorMaciel, Gary, advisor
dc.contributor.authorBernstein, Elliot, committee member
dc.contributor.authorWatson, A. Ted, committee member
dc.date.accessioned2007-01-03T05:35:28Z
dc.date.available2007-01-03T05:35:28Z
dc.date.issued2011
dc.description.abstractIn situ 13C NMR measurements are reported on 13C-enriched powdered poplar wood that is subjected to pretreatment with water and 0.5 M sulfuric acid as a function of time at 150 °C. 13C MAS (magic-angle spinning) spectra were obtained in both the CP (cross polarization) and DP (direct polarization) modes, the contrasts in this combination yielding valuable qualitative information on the effect of pretreatment on local molecular mobilities. In addition, spin-lattice relaxation values for 13C and for 1H, as well as cross polarization time constants TCH-1 and T1pH-1, were measured on dry wood, and on wood 10 % in 0.5 M sulfuric acid before, during and after treatment for lignin peaks and for holocellulose peaks in the 13C NMR spectra, as indicators of the degree of molecular motion for those two structural entities. The results show that a substantial fraction of the solid/semi-solid biomass in 0.5 M sulfuric acid is converted at elevated temperatures to a) chemically different and more mobile structures and/or b) locally similar structures with enhanced atomic-level mobilities, and that some fraction of this 'mobilized' biomass does not return to the original level of immobility upon cooling the acid-treated biomass back to room temperature.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierKohn_colostate_0053N_10574.pdf
dc.identifier.urihttp://hdl.handle.net/10217/48204
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.subjectin situ NMR
dc.subjectbiomass
dc.subjectdilute acid pretreatment
dc.subjectnuclear magnetic resonance
dc.subjectpoplar pretreatment
dc.subjectsolid state NMR
dc.titleIn-situ 13C CM-MAS NMR study of dilute acid biomass pretreatment on 13C enriched poplar wood
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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