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dc.contributor.authorDavis, Mark E.
dc.date.accessioned2011-03-30T15:07:03Z
dc.date.available2011-03-30T15:07:03Z
dc.date.issued2011-03-10
dc.identifier.urihttp://hdl.handle.net/1853/38332
dc.descriptionThis special lecture of the 26th annual Ashton Cary Lecture was presented on March 10, 2011, at 11:00 am in room L1255, Ford Environmental Science & Technology Building (ES&T) on the Georgia Tech campus.en_US
dc.descriptionThe Cary Lecture Series
dc.descriptionRuntime: 52:20 minutes
dc.description.abstractThe isomerization of glucose into fructose is a large-scale reaction for the production of high-fructose corn syrup and recently is being considered as an intermediate step in the possible route of biomass to fuels and chemicals. Here, it is shown that a large-pore zeolite that contains tin (Sn-Beta) is able to isomerize glucose to fructose in aqueous media with high activity and selectivity. Specifically, a 10 wt% glucose solution containing a catalytic amount of Sn-Beta (1:50 Sn:glucose molar ratio) gives product yields of approximately 46% (w/w) glucose, 31% (w/w) fructose, and 9% (w/w) mannose after 30 and 12 minutes of reaction at 383 K and 413 K, respectively. This reactivity is also achieved when a 45 wt% glucose solution is converted. The Sn-Beta catalyst can be used for multiple cycles, and the reaction stops when the solid is removed, clearly indicating that the catalysis is occurring heterogeneously. With isotopically labeled glucose, it is demonstrated (1H and 13C MAS NMR spectroscopy) that the isomerization reaction catalyzed by Sn-Beta in water proceeds by way of an intramolecular hydride shift, confirming that framework tin centers in Sn-Beta act as Lewis acids in aqueous media. Most importantly, the Sn-Beta catalyst is able to perform the isomerization reaction in highly acidic, aqueous environments with equivalent activity and product distribution as in media without added acid. This enables Sn-Beta to couple isomerizations with other acid-catalyzed reactions, including hydrolysis/isomerization or isomerization/dehydration reaction sequences, including starch to fructose and glucose to 5-hydroxymethylfurfural (HMF).en_US
dc.format.extent52:20 minutes
dc.language.isoen_USen_US
dc.publisherGeorgia Institute of Technologyen_US
dc.relation.ispartofseriesSchool of Chemical and Biomolecular Engineering Seminar Seriesen_US
dc.subjectAlternative fuelsen_US
dc.subjectBiofuelsen_US
dc.subjectBiomassen_US
dc.subjectCornen_US
dc.titleNew Heterogeneous Catalysts for Converting Sugars in Aqueous Mediaen_US
dc.typeLectureen_US
dc.typeVideoen_US
dc.contributor.corporatenameGeorgia Institute of Technology. School of Chemical and Biomolecular Engineering
dc.contributor.corporatenameCalifornia Institute of Technology


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