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ChemSusChem

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https://www.readbyqxmd.com/read/28074612/a-new-cuo-fe2o3-mcmb-conversion-anode-in-high-performance-lithium-ion-battery-using-li1-35ni0-48fe0-1mn1-72o4-spinel-cathode
#1
Daniele Di Lecce, Roberta Verrelli, Daniele Campanella, Vittorio Marangon, Jusef Hassoun
Ternary CuO-Fe2O3-MCMB conversion anode is herein characterized and combined with high-voltage Li1.35Ni0.48Fe0.1Mn1.72O4 spinel cathode in a lithium-ion battery of relevant performances in terms of cycling stability and rate capability. The CuO-Fe2O3-MCMB composite is prepared using high-energy milling, i.e., a low-cost pathway which leads to a crystalline structure, and homogeneous submicrometrical morphology revealed by X-ray diffraction and electronic microscopy. The anode reversibly exchanges lithium ions by conversion reactions of CuO and Fe2O3, as well as by insertion into MCMB carbon...
January 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28070981/synthesis-of-unsymmetrical-organic-carbonates-using-co2-as-a-feedstock-in-agcl-ionic-liquid-system-at-ambient-conditions
#2
Jiayin Hu, Jun Ma, Lu Lu, Qingli Qian, Zhaofu Zhang, Chao Xie, Buxing Han
Synthesis of unsymmetrical organic carbonates from the renewable and cheap CO2 is of great importance, but is challenging, especially at ambient conditions. In this work, we found that some metal salt/ionic liquid catalyst systems were highly active for the synthesis of unsymmetrical organic carbonates from CO2, propargylic alcohols, and primary alcohols. Especially, AgCl/1-butyl-3-methylimidazolium acetate ([Bmim][OAc]) system was very efficient for the reactions of a wide range of substrates at room temperature and atmospheric pressure, and the yields of the unsymmetrical organic carbonates could approach 100%...
January 10, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28067993/on-the-structure-property-relationships-of-cation-exchanged-zk-5-zeolites-for-co2-adsorption
#3
Trong Pham, Raul Lobo, Matthew Hudson, Craig Brown
The CO2 adsorption properties of cation-exchanged Li-, Na-, K-, and Mg-ZK-5 zeolites are correlated to the molecular structures determined by Rietveld refinements of synchrotron powder X-ray diffraction patterns. Li-, K-, and Na-ZK-5 all exhibit high isosteric heats of adsorption (Qst) at low CO2 coverage, with Na-ZK-5 having the highest Qst (≈49 kJ/mol). Mg2+ is located at the center of the zeolite hexagonal prism, with the cation inaccessible to CO2, leading to a much lower Qst (≈30 kJ/mol) and lower overall uptake capacity...
January 9, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28066996/selective-hydrogenation-of-nitriles-to-primary-amines-using-a-new-cobalt-phosphine-catalyst
#4
Rosa Adam, Charles Bheeter, Jose Cabrero-Antonino, Kathrin Junge, Ralf Jackstell, Matthias Beller
A general protocol for the catalytic hydrogenation of nitriles to primary amines using a non-noble metal based system is presented. Co(acac)3 in combination with tris(2-(dicyclohexylphosphanyl)ethyl) phosphane L3 catalyses efficiently the selective hydrogenation of a wide range of (hetero)aromatic and aliphatic nitriles to the corresponding amines.
January 9, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28063203/simultaneous-au-iii-extraction-and-in-situ-formation-of-polymeric-membrane-supported-gold-nanoparticles-a-sustainable-process-with-application-in-catalysis
#5
Lucia Mora-Tamez, Vicente Esquivel-Peña, Ana Lilia Ocampo, Eduardo Rodríguez de San Miguel, Daniel Grande, Josefina de Gyves
A polymeric membrane-supported catalyst with immobilized gold nanoparticles (AuNPs) was prepared through the extraction and in-situ reduction of gold(III) salts in a one-step strategy. Polymeric inclusion membranes (PIMs) and polymeric nanoporous membranes (PNMs) were tested as different membrane support systems. Transport experiments indicated that PIMs composed of cellulose triacetate, 2-nitrophenyloctyl ether, and an aliphatic tertiary amine (Adogen® 364 or Alamine® 336) were the most efficient supports for Au(III) extraction...
January 7, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28058807/a-new-triazine-based-covalent-organic-framework-for-high-performance-capacitive-energy-storage
#6
Asim Bhaumik, Piyali Bhanja, Kousik Bhunia, Debabrata Pradhan, Sabuj K Das, Ryuto Kimura, Yuh Hijikata, Stephan Irle
A new covalent organic framework material TDFP-1 has been designed through solvothermal Schiff base condensation reaction using two monomers 1,3,5-tris-(4-aminophenyl)triazine (TAPT) and 2,6-diformyl-4-methylphenol (DFP). Due to the high specific surface area of 651 m2 g-1 and extended π-conjugation with inherent microporosity, TDFP-1 exhibited excellent energy storage capacity with a maximum specific capacitance (SC) of 354 Fg-1, at 2 mV/s scan rate and good cyclic stability with 95% retention of its initial specific capacitance after 1000 cycles at 10 A g-1...
January 6, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28058792/metal-phenolic-carbon-nanocomposites-for-robust-and-flexible-energy-storage-devices
#7
Jun Young Oh, Yeonsu Jung, Young Shik Cho, Jaeyoo Choi, Ji Ho Youk, Nina Fechler, Seung Jae Yang, Chong Rae Park
Future electronic applications such as wearable electronics depend on the successful construction of energy storage devices with superior flexibility and high electrochemical performance. However, these prerequisites are challenging to combine: external forces often cause performance degradation while the trade-off between the required nanostructures for strength and electrochemical performance results only in energy storage. In this paper, we present a flexible supercapacitor design based on tannic acid (TA) and carbon nanotubes (CNTs) with a unique nanostructure...
January 5, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28054749/efficient-cleavage-of-lignin-carbohydrate-complexes-and-ultrafast-extraction-of-lignin-oligomers-from-wood-biomass-using-microwave-assisted-deep-eutectic-solvent-treatment
#8
Yongzhuang Liu, Wenshuai Chen, Qinqin Xia, Bingtuo Guo, Qingwen Wang, Shouxin Liu, Yixing Liu, Jian Li, Haipeng Yu
Lignocellulosic biomass is an abundant and renewable resource for the production of bio-based material derived value-added fuels, chemicals and materials, but its effective valorisation with an energy-efficient and environment-friendly strategy remains a challenge. Here, we report a facile approach for efficiently cleaving the lignin-carbohydrate complexes and ultrafast fractionating components from wood using microwave-assisted deep eutectic solvent treatment. The solvent was composed of sustainable choline chloride and oxalic acid dihydrate, and showed a hydrogen-bond acidity of 1...
January 5, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28052597/an-in-depth-structural-study-of-the-co2-adsorption-process-in-the-porous-metal-organic-frameworks-cpo-27-m
#9
Breogán Pato-Doldán, Mali H Rosnes, Pascal D C Dietzel
The CO2 adsorption process in the family of porous metal-organic framework materials CPO 27 M (M = Mg, Mn, Co, Ni, Cu and Zn) has been studied by variable temperature powder synchrotron X-ray diffraction under isobaric conditions. Rietveld analysis of the data provided a time-lapse view of the adsorption process with an unprecedented level of structural detail. It confirms the temperature dependent order of occupation of the up to three adsorption sites found in the pores of the CPO-27-M materials. In CPO-27-M (M = Mg, Mn, Co, Ni and Zn), the adsorption sites are occupied in sequential order, which is primarily due to the high affinity of CO2 towards the open metal site...
January 4, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28052573/metal-organic-coaxial-nanowire-array-electrodes-combining-large-energy-capacity-and-high-rate-capability
#10
Hideyuki Nakanishi, Ikuo Kikuta, Hiroyo Segawa, Yuto Kawabata, Reiko Kishida, Tomohisa Norisuye, Qui Tran-Cong-Miyata
Pseudocapacitors have been widely studied in the context of their potential applications in portable electronics and energy regeneration. However, the internal resistance within these devices hampers charge transport and limits their performance. As a result, maximum charge/discharge rates are typically limited to a few hundred mV/s for pseudocapacitors. Beyond this limit, capacitance rapidly decreases, and devices become incapable of storing energy. Here, we design electrodes in which coaxial nanowires made of highly conductive metal cores and pseudocapacitive organic shells are fabricated into a seamless, monolithic, and vertically aligned structure...
January 4, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28052537/hydrogen-oxidation-selective-electrocatalysis-by-fine-tuning-of-pt-ensemble-sites-to-enhance-the-durability-of-automotive-fuel-cells
#11
Su-Won Yun, Shin-Ae Park, Tae-June Kim, Jun-Hyuk Kim, Gi-Woong Pak, Yong-Tae Kim
A simple, inexpensive approach is proposed for enhancing the durability of automotive proton exchange membrane fuel cells by selective promotion of the hydrogen oxidation reaction (HOR) and suppression of the oxygen reduction reaction (ORR) at the anode in startup/shutdown events. Dodecanethiol forms a self-assembled monolayer (SAM) on the surface of Pt particles, thus decreasing the number of Pt ensemble sites. Interestingly, by controlling the dodecanethiol concentration during SAM formation, the number of ensemble sites can be precisely optimized such that it is sufficient for the HOR but insufficient for the ORR...
January 4, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28052581/coupling-reactions-of-carbon-dioxide-with-epoxides-catalyzed-by-vanadium-aminophenolate-complexes
#12
Francesca Maria Kerton, Ali Issa Elkurtehi
A series of vanadium compounds supported by tetradentate amino-bis(phenolate) ligands were screened for catalytic reactivity in the reaction of propylene oxide (PO) with carbon dioxide, [VO(OMe)(O2NOBuMeMeth)] (1), [VO(OMe)(ON2OBuMe)] (2), [VO(OMe)(O2NNBuBuPy)] (3), and [VO(OMe)(O2NOBuBuFurf)] (4) (where (O2NOBuMeMeth) = MeOCH2CH2N(CH2ArO-)2, Ar = 3,5-C6H2-Me, tBu]; (ON2OBuMe) = -OArCH2NMeCH2 CH2NMeCH2ArO-, Ar = 3,5-C6H2-Me, tBu; (O2NNBuBuPy) = C5H4NCH2N(CH2ArO-)2, Ar = 3,5-C6H2-tBu2; (O2NOBuBuFurf) = C4H3OCH2N(CH2ArO-)2, Ar = 3,5-C6H2-tBu2)...
January 3, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28052535/synthesis-of-renewable-triketones-diketones-and-jet-fuel-range-cycloalkanes-with-5-hydroxymethylfurfural-and-ketones
#13
Shanshan Li, Fang Chen, Ning Li, Wentao Wang, Xueru Sheng, Aiqin Wang, Yu Cong, Xiaodong Wang, Tao Zhang
For the first time, a series of renewable C9-C12 triketones with repeating [COCH2CH2] units were synthesized in high carbon yields (~90%) by the aqueous phase hydrogenation of the aldol condensation products of 5-hydroxylmethylfurfural (HMF) and ketones over the Au/TiO2 catalyst. Compared with the reported routes, this new route has many advantages such as environmental friendly, fewer steps, using a cheaper easier separation and reusable catalyst, etc.. The triketones as obtained can be used as feedstocks in the production of conducting or semi-conducting polymers...
January 3, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28045228/syringaresinol-a-renewable-and-safer-alternative-to-bisphenol-a-for-epoxy-amine-resins
#14
Marine Janvier, Louis Hollande, Abdus Samad Jaufurally, Miguel Pernes, Raphaël Ménard, Marina Grimaldi, Johnny Beaugrand, Patirck Balaguer, Paul-Henri Ducrot, Florent Allais
A renewable bis-epoxy, SYR-EPO, has been prepared from syringaresinol, a naturally occurring bisphenol deriving from sinapic acid, using a chemo-enzymatic synthetic pathway. Estrogenic activity test revealed no endocrine disruption for syringaresinol. Its glycidylation afforded bis-epoxy SYR-EPO with excellent yield and purity. This biobased safer epoxy precursor was then cured with conventional and renewable diamines for the preparation of epoxy-amine resins. The resulting thermosets were thermally and mechanically characterized (TGA, DSC and DMA)...
January 3, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28044433/dynamically-self-assembled-graphene-quantum-dots-mediated-synthesis-of-truly-pristine-graphene-supported-cop-nanoparticles-as-an-efficient-electrocatalyst-for-hydrogen-evolution
#15
Xiaoyan Wang, Weiyong Yuan, Yanan Yu, Chang Ming Li
A highly active, durable, and low-cost hydrogen evolution reaction (HER) catalyst is desirable for energy storage via water splitting but its fabrication presents great challenges. Herein, mediated by dynamically self-assembled graphene quantum dots (GQDs), ultra-small, uniform, high-density, and well-dispersed CoP nanoparticles (NPs) were in-situ grown on truly pristine graphene for the first time. This hybrid nanostructure was then employed as a HER electrocatalyst, showing an onset potential of 7 mV, an overpotential of 91...
January 2, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28044419/nhc-ag-pd-catalyzed-reductive-carboxylation-of-terminal-alkyne-with-co2-and-h2-a-combined-experimental-and-computational-study-for-fine-tuned-selectivity
#16
Yugen Zhang, Dingyi Yu, Feng Zhou, Diane Shu Wen Lim, Haibin Su
Reductive carboxylation of terminal alkynes utilizing CO2 and H2 as reactants is an interesting and challenging transformation. Theoretical calculations indicated it would be kinetically possible to obtain cinnamic acid, the reductive carboxylation product, from phenylacetylene in a CO2/H2 system with NHC-supported Ag/Pd dual-metal catalysts via competitive carboxylation/hydrogenation cascade reactions in one step. These calculations have been verified experimentally with a poly-NHC-supported Ag/Pd catalyst...
January 2, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28042912/lignin-based-materials-through-thiol-maleimide-click-polymerization
#17
Pietro Buono, Antoine Duval, Luc Averous, Youssef Habibi
In the present work we propose an environmentally friendly approach to transform renewable feedstocks into value-added materials. This transformation pathway is conducted under green conditions, without the use of solvents and catalyst. First, controlled modification of lignin, a major biopolymer present in wood and plants, was achieved through the esterification with 11-maleimidoundecylenic acid (11-MUA), a derivative from ocastor oil that contains maleimide groups. Different degrees of substitution were achieved by using various amounts of the 11-MU acyl chloride leading to an efficient conversion of lignin hydroxyl groups as demonstrated by 1H and 31P NMR analyses...
January 2, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28039942/metallosalen-based-ionic-porous-polymers-as-bifunctional-catalysts-for-the-conversion-of-co2-into-valuable-chemicals
#18
Rongchang Luo, Yaju Chen, Qian He, Xiaowei Lin, Qihang Xu, Xiaohui He, Wuying Zhang, Xiantai Zhou, Hongbing Ji
A series of novel metallosalen-based ionic porous organic polymers (POPs) were synthesized for the first time using a simple unique strategy from the free-radical copolymerization reaction. Various techniques were used to characterize the physicochemical properties of these catalysts. It was found that the well-designed materials endowed high surface area, hierarchical porous structures and superior CO2/N2 adsorptive selectivity. Moreover, these POPs having both metal centers (Lewis acid) and ionic units (nuclephile) could be served as bifunctional catalysts in the catalytic conversion of CO2 into high value-added chemicals without any additional cocatalyst under mild and solvent-free conditions, e...
December 31, 2016: ChemSusChem
https://www.readbyqxmd.com/read/28033455/a-hydrazone-based-covalent-organic-framework-as-an-efficient-and-reusable-photocatalyst-for-the-cross-dehydrogenative-coupling-reaction-of-n-aryltetrahydroisoquinolines
#19
Qiaolin Wu, Wanting Liu, Qing Su, Pengyao Ju, Bixuan Guo, Hui Zhou, Guanghua Li
A hydrazone-based covalent organic framework (COF) was synthesized by condensation of 2,5-dimethoxyterephthalohydrazide with 1,3,5-triformylbenzene under solvothermal conditions. The COF material exhibits excellent porosity with a BET surface area of up to 1501 m2g-1, high crystallinity, and good thermal and chemical stability. The COF material exhibited efficient photocatalytic activity towards cross-dehydrogenative coupling (CDC) reactions between tetrahydroisoquinolines and nucleophiles such as nitromethane, acetone and phenylethyl ketone...
December 29, 2016: ChemSusChem
https://www.readbyqxmd.com/read/28032695/direct-synthesis-of-renewable-dodecanol-and-dodecane-with-methyl-isobutyl-ketone-over-dual-bed-catalyst-systems
#20
Xueru Sheng, Ning Li, Guangyi Li, Wentao Wang, Aiqin Wang, Yu Cong, Xiaodong Wang, Tao Zhang
For the first time, we demonstrated two integrated processes for the direct synthesis of dodecanol or 2,4,8-trimethylnonane (a jet fuel range C12 branched alkane) with methyl isobutyl ketone (MIBK) which can be derived from lignocellulose. The reactions were carried out in two-bed continuous flow reactors. In the first bed, MIBK was selectively converted to a mixture of C12 alcohol and ketone. Over the Pd modified magnesium-aluminium hydrotalcite (Pd-MgAl-HT) catalyst, high total carbon yield (73.0%) of C12 oxygenates can be achieved under mild conditions...
December 29, 2016: ChemSusChem
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