New Heterogeneous Catalysts for Converting Sugars in Aqueous Media

Show simple item record Davis, Mark E. 2011-03-30T15:07:03Z 2011-03-30T15:07:03Z 2011-03-10
dc.description This 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.description The Cary Lecture Series
dc.description Runtime: 52:20 minutes
dc.description.abstract The 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.extent 52:20 minutes
dc.language.iso en_US en_US
dc.publisher Georgia Institute of Technology en_US
dc.relation.ispartofseries School of Chemical and Biomolecular Engineering Seminar Series en_US
dc.subject Alternative fuels en_US
dc.subject Biofuels en_US
dc.subject Biomass en_US
dc.subject Corn en_US
dc.title New Heterogeneous Catalysts for Converting Sugars in Aqueous Media en_US
dc.type Lecture en_US
dc.type Video en_US
dc.contributor.corporatename Georgia Institute of Technology. School of Chemical and Biomolecular Engineering
dc.contributor.corporatename California Institute of Technology

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