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RISS 인기검색어
- 검색키워드
- 저자 : ( James A. Dumesic ) (검색결과 4 건)
- 무료
- 기관 내 무료
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Han, Jeehoon,Luterbacher, Jeremy S.,Alonso, David Martin,Dumesic, James A.,Maravelias, Christos T. Elsevier 2015 Bioresource technology Vol.182 No.-
<P><B>Abstract</B></P> <P>The work develops a strategy for the production of ethanol from lignocellulosic biomass. In this strategy, the cellulose and hemicellulose fractions are simultaneously converted to sugars using a γ-valerolactone (GVL) solvent containing a dilute acid catalyst. To effectively recover GVL for reuse as solvent and biomass-derived lignin for heat and power generation, separation subsystems, including a novel CO<SUB>2</SUB>-based extraction for the separation of sugars from GVL, lignin and humins have been designed. The sugars are co-fermented by yeast to produce ethanol. Furthermore, heat integration to reduce utility requirements is performed. It is shown that this strategy leads to high ethanol yields and the total energy requirements could be satisfied by burning the lignin. The integrated strategy using corn stover feedstock leads to a minimum selling price of $5 per gallon of gasoline equivalent, which suggests that it is a promising alternative to current biofuels production approaches.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A process based on a new GVL-based biomass hydrolysis technology is studied. </LI> <LI> New separations for recovery of sugars, GVL, and lignin are developed. </LI> <LI> Separations are integrated with biomass-to-sugars and sugar-to-ethanol conversions. </LI> <LI> Proposed strategy is an attractive alternative to enzymatic lignocellulosic ethanol. </LI> <LI> Study identifies future research directions in conversions and separations. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Motagamwala, Ali Hussain,Won, Wangyun,Maravelias, Christos T.,Dumesic, James A. unknown 2016 Green Chemistry Vol. No.
<P>γ-Valerolactone (GVL) is a biomass-derived solvent which completely solubilizes all fractions of lignocellulosic biomass, leading to the recovery of polysaccharides (cellulose and hemicellulose) as soluble carbohydrates at high yields (>70%) without the use of expensive reagents, like enzymes and ionic liquids. Biological upgrading of carbohydrates to biofuels or bio-based chemicals requires that the carbohydrates are separated from GVL. We demonstrate that an engineered solvent system consisting of GVL, water and an organic co-solvent is mono-phasic at the temperatures used for biomass fractionation (<I>e.g.</I>, 160 °C) and is bi-phasic at lower temperatures (<I>e.g.</I>, room temperature). The advantage of using this engineered solvent system is that the carbohydrates are spontaneously separated from organic solvent components into an aqueous hydrolysate stream, thereby avoiding the need for expensive and potentially hazardous separation processes, such as operation at elevated pressures required for separation using liquid CO<SUB>2</SUB>. We also show that the organic co-solvent can be selected from an array of organic components, leading to a trade-off between the efficacy of carbohydrate separation and the ‘greenness’ of the solvent. We show further that toluene is a promising co-solvent component, and techno-economic analyses of the process, wherein toluene is used as a co-solvent, lead to a minimum selling price of ethanol of $3.10 per gallon of gasoline equivalent.</P> <P>Graphic Abstract</P><P>We demonstrate the design of a solvent system for efficient production and enhanced separation of carbohydrates from lignocellulosic biomass. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c6gc02297a'> </P>
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Aqueous-phase hydrodeoxygenation of sorbitol over bifunctional catalysts
김용태,( James A. Dumesic ),( George W. Huber ) 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Hydrodeoxygenation (HDO) is a platform technology for conversion of biomass feedstocks into a range of fuels and chemicals including C1-C6 alkanes, C1-C6 mono-alcohols, C2-C6 polyols, and larger intermediate. The combination of metal and acid sites on the bifunctional catalytic system is important to tune the ratio of C-O bond to C-C bond cleavage during HDO reactions. The challenge with HDO is to selectively produce targeted products that can be used as fuel blendstocks and chemicals tuned by chemistry and reaction engineering. Understanding the reaction networks in HDO has aided in the design of efficient bifunctional catalysts. In this presentation we will discuss the differences between two fundamentally different classes of bifunctional metal-acid catalysts and show how we can modify HDO reaction.
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Preferential Oxidation of CO in H<sub>2</sub> by Aqueous Polyoxometalates over Metal Catalysts
Kim, Won Bae,Voitl, Tobias,Rodriguez-Rivera, Gabriel J.,Evans, Steven T.,Dumesic, James. A. WILEY-VCH Verlag 2005 Angewandte Chemie. international edition Vol.44 No.5
<B>Graphic Abstract</B> <P>Stream cleaning: CO in CO/H<SUB>2</SUB> mixtures is oxidized preferentially at room temperature with an aqueous polyoxometalate (POM) solution over gold catalysts (see scheme). The rate of H<SUB>2</SUB> oxidation is slow and is inhibited by CO. This process can be used to remove CO efficiently from H<SUB>2</SUB> gas streams. The solution containing protons and reduced POM can be used to produce electrical energy at a fuel-cell anode through re-oxidation of the reduced POM. <img src='wiley_img/14337851-2005-44-5-ANIE200461601-content.gif' alt='wiley_img/14337851-2005-44-5-ANIE200461601-content'> </P>
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