Journal
RSC ADVANCES
Volume 5, Issue 36, Pages 28478-28486Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra02645h
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Funding
- Nebraska Center for Energy Sciences and Army Research Office [W911NF-10-2-0099]
- UCARE program at the University of Nebraska-Lincoln (UNL)
- NASA Nebraska Space Grant Fellowship
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A hybrid catalyst composed of phosphotungstic acid coated cerium oxide nanoparticles was demonstrated to catalyze the one-pot conversion of cellobiose, the disaccharide unit of cellulose, to a monosaccharide mixture of glucose and mannose. A high % conversion of cellobiose (up to 99%) was achieved resulting in a yield of mannose up to 15.8%. The yield of mannose from a glucose starting material was 22.8%, exceeding those of previous cerium-based glucose epimerization catalysts. The components of the hybrid material were revealed to function synergistically via a two-step process. Cellobiose was hypothesized to be first hydrolyzed to glucose, which was subsequently epimerized to mannose by the cerium ions leached from the catalyst. The C-13 NMR spectroscopic study suggested that the epimerization likely occurred by way of a 1,2-carbon shift reaction mechanism.
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