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https://www.readbyqxmd.com/read/27922209/unconventional-pretreatment-of-lignocellulose-with-low-temperature-plasma
#1
Jens Vanneste, Thijs Ennaert, Annick Vanhulsel, Bert F Sels
Lignocellulose represents a potential supply of sustainable feedstock for the production of biofuels and chemicals. There is, however, an important cost and efficiency challenge associated with the conversion of such lignocellulosics. Since its structure is complex and not prone to undergo chemical reactions very easily, chemical and mechanical pretreatments are usually necessary in order to be able to refine them into the compositional building blocks (carbohydrates and lignin), from which value-added platform molecules such as glucose, ethylene glycol, 5-hydroxymethylfurfural, levulinic acid, etc...
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27922208/aluminum-mediated-formation-of-cyclic-carbonates-benchmarking-catalytic-performance-metrics
#2
Arjan Willem Kleij, Jeroen Rintjema
We report a comparative study on the activity of a series of five binary catalysts derived from various reported aluminum-based complexes. A benchmarking of their initial rates in the coupling of various terminal and internal epoxides in the presence of three different nucleophilic additives has been carried out providing for the first time a useful comparison of activity metrics in the area of cyclic organic carbonate formation. These investigations provide a useful framework how to realistically valorize relative reactivities and which features are important to consider the ideal operational window of each binary catalyst system...
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27922205/one-pot-preparation-of-dimethyl-isosorbide-from-d-sorbitol-via-dimethyl-carbonate-chemistry
#3
Fabio Arico', Pietro Tundo, Alexander Aldoshin
Direct synthesis of dimethyl isosorbide (DMI) from D-sorbitol via dimethyl carbonate (DMC) chemistry is herein firstly reported. High yield of DMI was achieved using nitrogen superbase 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) as catalyst and performing the reaction in a stainless steel autoclave by increasing the temperature from 90°C to 200 °C. In this procedure DMC features its full capacity, acting in the different steps of the process as carboxymethylating, leaving group (cyclization) and methylating agent; DMC is also employed as the reaction media...
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27921385/-practical-electrospinning-of-biopolymers-in-ionic-liquids
#4
Julia L Shamshina, Oleksandra Zavgorodnya, Jonathan R Bonner, Gabriela Gurau, Thomas Di Nardo, Robin D Rogers
To address the need to scale up technologies for electrospinning of biopolymers from ionic liquids to practical volumes, a setup for the multi-needle electrospinning of chitin using the ionic liquid 1-ethyl-3-methylimidazolium acetate, [C2 mim]-[OAc], was designed, built, and demonstrated. Materials with controllable and high surface area were prepared at the nanoscale using ionic-liquid solutions of high-molecular-weight chitin extracted with the same ionic liquid directly from shrimp shells.
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27921378/origin-of-the-excellent-performance-of-ru-on-nitrogen-doped-carbon-nanofibers-for-co2-hydrogenation-to-ch4
#5
Laura Roldán, Yanila Marco, Enrique García-Bordejé
Carbon materials have rarely been used as support for CO2 methanation, which is usually carried out using catalysts supported on metal oxides. Here, it is shown that Ru nanoparticles supported on nitrogen-doped carbon nanofibers (NCNF) provide competitive CH4 production rate and stability compared to Al2 O3 -supported catalysts. Contrary to the general belief about the inert nature of carbon supports, it is demonstrated that NCNF is a non-innocent spectator in CO2 methanation due to its ability to store a high amount of COad reaction intermediates...
December 6, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27921384/a-robust-molecular-catalyst-generated-in-situ-for-photo-and-electrochemical-water-oxidation
#6
Hussein A Younus, Nazir Ahmad, Adeel H Chughtai, Matthias Vandichel, Michael Busch, Kristof Van Hecke, Mekhman Yusubov, Shaoxian Song, Francis Verpoort
Water splitting is the key step towards artificial photosystems for solar energy conversion and storage in the form of chemical bonding. The oxidation of water is the bottle-neck of this process that hampers its practical utility and hence efficient, robust, and also easy to make catalytic systems based on cheap and earth abundant materials are of exceptional importance. Here, we present an in-situ generated cobalt catalyst [Co(II)(TCA)2(H2O)2] (TCA = 1-Mesityl-1,2,3-1H-triazole-4-carboxylate) efficiently conducting photochemical water oxidation at near-neutral conditions...
December 5, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27918642/high-performance-porphyrin-based-dye-sensitized-solar-cells-with-both-iodine-and-cobalt-redox-shuttles
#7
Huaide Xiang, Wei Fan, Jiahui Li, Tianyue Li, Neil Robertson, Xiongrong Song, Wenjun Wu, Zhaohui Wang, Weihong Zhu, He Tian
Recently, enormous research passion has been devoted to enhance the power conversion efficiency (PCE) of porphyrin sensitizers for DSSCs, but the major stumbling block is its absorption defects in visible spectrum region. To address the challenge, herein we reported a duplexing high performance photovoltaic result for DSSCs based on a novel D-π-A sensitizer FW-1 7H-Dibenzo[c,g] carbazole-substituted and fused Zn-porphyrin, co-sensitized with benzotriazole featured dye (WS-5) in iodine and cobalt redox system and got high PCE of 10...
December 5, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27911498/solvothermally-prepared-cu2o-electrocatalysts-for-co2-reduction-with-tunable-selectivity-by-the-introduction-of-p-block-elements
#8
Gastón O Larrazábal, Antonio J Martín, Frank Krumeich, Roland Hauert, Javier Pérez-Ramírez
The electroreduction of CO2 to fuels and chemicals is an attractive strategy for valorizing CO2 emissions. In this study, we show that a Cu2O electrocatalyst prepared by a simple and potentially scalable solvothermal route effectively targeted CO evolution at low to moderate overpotentials (CECO ca. 60% after 12 h at -0.6 V vs. RHE), and that the introduction of p-block elements (In, Sn, Ga, Al) into the catalyst can be employed to tune its selectivity. SEM, HRTEM, and voltammetric analyses revealed that the Cu2O catalyst undergoes extensive surface restructuring (favorable for CO evolution) under reaction conditions...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27911042/orderly-layered-zr-benzylphosphonate-nanohybrids-for-efficient-acid-base-mediated-bifunctional-cascade-catalysis
#9
Hu Li, Zhen Fang, Jian He, Song Yang
The development of functional metal-organic materials being robust and active for bifunctional/cascade catalysis is of great significance. Herein, a series of mesoporous and orderly layered nanohybrids were synthesized for the first time via simple and template-free assembly of ortho-, meta-, or para-xylylenediphosphonates (o-, p-, or m-PhP) with zirconium. It was found that m-PhPZr nanoparticles (20-50 nm) with mesopores centered at 7.9 nm and high Lewis acid/base site ratio (1:0.7) showed prominent performance under mild conditions (as low as 82 ºC) in transfer hydrogenation of carbonyl compounds including bio-aldehydes to alcohols with near quantative yields and little Zr leaching...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27910220/inverse-vulcanization-of-sulfur-with-natural-dienes-as-sustainable-materials-for-lithium-sulfur-batteries
#10
David Mecerreyes, Iñaki Gomez, Alberto Blazquez, Olatz Leonet
Lithium sufur batteries are among the most promising next generation battery systems due to the high capacity properties of sulfur as cathodic material. Beyond its interesting intrinsic properties, sulfur possesses a very low conductivity and complex electrochemistry which involves the high solubility of the lithium sulfides in the electrolyte. These two characteristics trigger a series of limitations on its performance as active cathode material which leads to batteries with low cyclability. Recently, inverse vulcanizated sulfur has shown to retain capacity far better than elemental sulfur leading to batteries with excellent cyclability...
December 2, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27911491/integrating-reverse-electrodialysis-stacks-with-flow-batteries-to-achieve-improved-energy-recovery-from-salinity-gradients-and-energy-storage
#11
Xiuping Zhu, Taeyoung Kim, Mohammad Rahimi, Christopher Gorski, Bruce Logan
Salinity gradient energy can be directly converted to electrical power using reverse electrodialysis (RED) and other technologies, but reported power densities have been too low for practical applications. Here, the RED stack performance was improved by using 2,6-dihydroxyanthraquinone and ferrocyanide as redox couples. These electrolytes were then used in a flow battery, to produce an integrated RED stack and flow battery (RED-FB) system capable of capturing, storing, and discharging salinity gradient energy...
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27910256/simultaneous-upgrading-of-furanics-and-phenolics-via-hydroxyalkylation-aldol-condensation-reactions
#12
Tuong V Bui, Tawan Sooknoi, Daniel E Resasco
The simultaneous conversion of cyclopentanone and m-cresol has been investigated on a series of solid acid catalysts. Both compounds are representative of biomass-derived streams. Cyclopentanone can be readily obtained from sugar-derived furfurals via Piancatelli rearrangement under reducing conditions. Cresol represents the family of phenolics, typically obtained from the depolymerization of lignin. In the first biomass conversion strategy proposed here, furfural is converted in high yields and selectivity to cyclopentanone (CPO) over metal catalysts such as Pd-Fe/SiO2 catalyst at 600 psia H2 and 150oC...
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27910231/monitoring-the-reaction-mechanism-in-model-biogas-reforming-by-in-situ-transient-and-steady-state-drifts-measurements
#13
Luis F Bobadilla, Victoria Garcilaso, Miguel A Centeno, José A Odriozola
In this work, the reforming of model biogas reaction has been investigated on a Rh/MgAl2O4 catalyst. In situ transients and steady-state DRIFTS measurements were used to gain insights about the reaction mechanism involved in the activation of CH4 and CO2. It was found that the reaction proceeds through of an initial pathway in which methane and CO2 are both dissociated on Rh metallic sites, and additionally a bifunctional mechanism in which methane is activated on Rh sites and CO2 is activated on the basic sites of the support surface via formate intermediate by H-assisted CO2 decomposition...
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27906508/co2-capture-with-ionic-liquids-ils-and-deep-eutectic-solvents-dess-a-new-generation-of-sorbents
#14
Shokat Sarmad, Jyri-Pekka Mikkola, Xiaoyan Ji
High cost and high energy penalty for carbon dioxide (CO2) uptake from flue gases are important obstacles in large-scale industrial applications, and developing efficient technology for CO2 capture from technic and economic points is crucial. Ionic liquids (ILs) show the potential for CO2 separation due to their inherent advantages and have been proposed as alternatives in order to overcome the drawbacks of conventional sorbents. Chemical modification of ILs to improve their performance in CO2 absorption has received more attention...
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27906507/palladium-ii-catalysed-oxidative-aminocarbonylation-for-the-synthesis-of-2-ynamides-addressing-the-challenges-of-solvents-and-gas-mixtures
#15
Nicola Hughes, Clare Brown, Andrew Irwin, Qun Cao, Mark Muldoon
2-Ynamides can be synthesised via Pd(II) catalysed oxidative carbonylation, utilizing low catalyst loadings. A variety of alkynes and amines can be used to afford 2-ynamides in high yields, whilst overcoming the drawbacks associated with previous oxidative methods which rely on dangerous solvents and gas mixtures.
December 1, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27901319/salt-templating-with-pore-padding-hierarchical-pore-tailoring-towards-functionalised-porous-carbons
#16
K Vasanth Kumar, Srinivas Gadipelli, Kathrin Preuss, Harshit Porwal, Tingting Zhao, Zheng Xiao Guo, Maria-Magdalena Titirici
We propose a new synthetic route towards nanoporous functional carbon materials based on salt templating with pore-padding approach (STPP). STPP relies on the use of a pore-padding agent that undergoes an initial polymerisation/ condensation process prior to the formation of a solid carbon framework. The pore-padding agent allows tailoring hierarchically the pore-size distribution and controlling the amount of heteroatom (nitrogen in this case) functionalities as well as the type of nitrogen (graphitic, pyridinic, oxides of nitrogen) incorporated within the carbon framework in a single-step-process...
November 30, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27901318/selective-synthesis-of-cyclic-carbonate-by-salalen-aluminum-complexes-and-mechanistic-studies
#17
Mariachiara Cozzolino, Tomer Rosen, Israel Goldberg, Mina Mazzeo, Marina Lamberti
Salalen aluminum complexes were synthesized and used as catalysts in the reactions of CO2 with different epoxides. The reaction of cyclohexene oxide and CO2 was thoroughly investigated. In particular, the effect of the reaction conditions (nature and equivalents of the cocatalyst, CO2 pressure and temperature) and of the ligands (substituents on the ancillary ligand, nature of the labile ligand and nature of the nitrogen donor atoms) on the outcoming of this reaction were studied. The cycloaddition reaction of the CO2 with terminal epoxides, bearing different functional groups, was realized...
November 30, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27899009/concise-xanthine-synthesis-via-a-double-amidination-reaction-of-a-6-chlorouracil-with-amidines-using-base-metal-catalysis
#18
Bénédicte Morel, Philippe Franck, Johan Bidange, Sergey Sergeyev, Dan Smith, Jonathan Moseley, Bert Uw Maes
A novel and concise route towards xanthines via a double amidination reaction is described; consecutive intermolecular C-Cl and intramolecular oxidative C-H amidination. N-uracil amidines are obtained via SNAE on a 6-chlorouracil with amidines. Direct Cu-catalyzed oxidative C-H amidination on these N-uracil amidines yields polysubstituted xanthines. Sustainable oxidants, di-tert-butyl peroxide or oxygen, can be used in this oxidase type reaction. The protocol allows for the introduction of N1, N3, N7 and C8 substituents during the xanthine scaffold construction, thus avoiding post-functionalization steps...
November 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27899004/the-influence-of-binders-and-solvents-on-the-stability-of-ru-ruox-oer-catalyst-nanoparticles-on-ito-nanocrystals-in-cycled-li-o2-battery-cathodes
#19
Svetoslava Vankova, Carlotta Francia, Julia Amici, Juqin Zeng, Silvia Bodoardo, Nerino Penazzi, Gillian Collins, Hugh Geaney, Colm O'Dwyer
Li-O2 battery research at a fundamental level remains critical, and nature of reactions and stability are paramount for realising the promise of the Li-O2 system. We report that ITO nanocrystals with supported 1-2 nm OER catalyst Ru/RuOx nanoparticles demonstrate efficient OER processes, significantly reducing the cell's recharge overpotential, and maintain catalytic activity to promote a consistent cycling discharge potential in Li-O2 cells even when the ITO support nanocrystals deteriorate from the very first cycle...
November 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27898203/biorefining-of-lignocellulosic-feedstock-by-a-modified-ammonia-fiber-expansion-pretreatment-and-enzymatic-hydrolysis-for-production-of-fermentable-sugars
#20
Birgit Kamm, Sebastian Leiß, Petra Schönicke, Matthias Bierbaum
Wheat straw was pretreated and afterwards enzymatically hydrolyzed using a modified ammonia fiber expansion (AFEX) process under different reaction conditions to produce fermentable sugars. Instead of liquid ammonia, aqueous ammonia (25 % w/v) was used to test its influence on the sugar concentration and yield of the sugars. It is shown that a protein extraction after the pretreatment can distinctly improve the result obtained for the enzymatic hydrolysis. This modified AFEX process using aqueous ammonia represents a simpler and less expensive variant of the AFEX process usually described in literature...
November 29, 2016: ChemSusChem
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