Accession Number : ADA537213


Title :   Renewable Hydrogen Carrier - Carbohydrate: Constructing the Carbon-Neutral Carbohydrate Economy


Descriptive Note : Journal article


Corporate Author : OAK RIDGE NATIONAL LAB TN BIOLOGY DIV


Personal Author(s) : Zhang, Y P ; Mielenz, Jonathan R


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a537213.pdf


Report Date : 31 Jan 2011


Pagination or Media Count : 24


Abstract : The hydrogen economy presents an appealing energy future but its implementation must solve numerous problems ranging from low-cost sustainable production, high-density storage, costly infrastructure, to eliminating safety concern. The use of renewable carbohydrate as a high-density hydrogen carrier and energy source for hydrogen production is possible due to emerging cell-free synthetic biology technology--cell-free synthetic pathway biotransformation (SyPaB). Assembly of numerous enzymes and co-enzymes in vitro can create complicated set of biological reactions or pathways that microorganisms or catalysts cannot complete, for example, C6H10O5 (aq) + 7 H2O (l) - 12 H2 (g) + 6 CO2 (g) (PLoS One 2007, 2:e456). Thanks to 100% selectivity of enzymes, modest reaction conditions, and high-purity of generated hydrogen, carbohydrate is a promising hydrogen carrier for end users. Gravimetric density of carbohydrate is 14.8 H2 mass% if water can be recycled from proton exchange membrane fuel cells or 8.33% H2 mass% without water recycling. Renewable carbohydrate can be isolated from plant biomass or would be produced from a combination of solar electricity/hydrogen and carbon dioxide fixation mediated by high-efficiency artificial photosynthesis mediated by SyPaB. The construction of this carbon-neutral carbohydrate economy would address numerous sustainability challenges, such as electricity and hydrogen storage, CO2 fixation and long-term storage, water conservation, transportation fuel production, plus feed and food production.


Descriptors :   *HYDROGEN , *PHOTOSYNTHESIS , ENZYMES , CARBOHYDRATES , CARBON DIOXIDE , BIOCHEMISTRY , REPRINTS


Subject Categories : Biochemistry
      Industrial Chemistry and Chemical Processing
      Fuels


Distribution Statement : APPROVED FOR PUBLIC RELEASE