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https://www.readbyqxmd.com/read/28930435/new-triplet-sensitization-routes-for-photon-upconversion-thermally-activated-delayed-fluorescence-molecules-inorganic-nanocrystals-and-singlet-to-triplet-absorption
#1
Nobuhiro Yanai, Nobuo Kimizuka
Photon upconversion based on triplet-triplet annihilation (TTA-UC) has attracted much interest because of its possible applications to renewable energy production and biological fields. In particular, the UC of near-infrared (NIR) light to visible (vis) light is imperative to overcome the Shockley-Queisser limit of single-junction photovoltaic cells, and the efficiency of photocatalytic hydrogen production from water can also be improved with the aid of vis-to-ultraviolet (UV) UC. However, both processes have met limitations in the wavelength range, efficiency, and sensitivity for weak incident light...
September 20, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28930186/the-effect-of-copper-addition-on-the-activity-and-stability-of-iron-based-co%C3%A2-hydrogenation-catalysts
#2
Matthew J Bradley, Ramagopal Ananth, Heather D Willauer, Jeffrey W Baldwin, Dennis R Hardy, Frederick W Williams
Iron-based CO₂ catalysts have shown promise as a viable route to the production of olefins from CO₂ and H₂ gas. However, these catalysts can suffer from low conversion and high methane selectivity, as well as being particularly vulnerable to water produced during the reaction. In an effort to improve both the activity and durability of iron-based catalysts on an alumina support, copper (10-30%) has been added to the catalyst matrix. In this paper, the effects of copper addition on the catalyst activity and morphology are examined...
September 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28929371/exploration-of-zr-metal-organic-framework-as-efficient-photocatalyst-for-hydrogen-production
#3
Zhiliang Jin, Hao Yang
The application of metal-organic framework (MOF) in the field of photocatalysis is limited, because of its unstable chemical properties and failure to respond in visible light. Herein, the Pd/MOF catalysts were prepared by impregnation reduction. It is important that we have reasonably constructed the dye-sensitized system of Pd/MOF and successfully extended the application of MOF to the visible range. It exhibited maximal photocatalytic activity (9.43 mmol/g) under visible-light irradiation (λ ≥ 420 nm) with eosin Y as a photo-sensitizer, which was enhanced twice the order of magnitude compared with the pure MOF (0...
September 19, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28928375/an-efficient-co3s4-cop-hybrid-catalyst-for-electrocatalytic-hydrogen-evolution
#4
Tingting Wang, Liqian Wu, Xiaobing Xu, Yuan Sun, Yuanqi Wang, Wei Zhong, Youwei Du
The development of efficient, universal and inexpensive electrocatalysts for hydrogen evolution reaction (HER) is central to the area of sustainable energy conversion. Considering the Co-based sulfides/phosphides have the same catalytic mechanism with the hydrogenases occurring in nature. Here, a new catalyst based on Co3S4/CoP hybrid that is comprised entirely cheap and earthabundant elements, was first synthesized via a two-step method, the Co(CO3)0.5(OH)·0.11H2O precursor was prepared by a hydrothermal method, followed by phosphidation and sulphidation under Ar atmosphere simultaneously...
September 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28928359/hydrodeoxygenation-of-water-insoluble-bio-oil-to-alkanes-using-a-highly-dispersed-pd-mo-catalyst
#5
Haohong Duan, Juncai Dong, Xianrui Gu, Yung-Kang Peng, Wenxing Chen, Titipong Issariyakul, William K Myers, Meng-Jung Li, Ni Yi, Alexander F R Kilpatrick, Yu Wang, Xusheng Zheng, Shufang Ji, Qian Wang, Junting Feng, Dongliang Chen, Yadong Li, Jean-Charles Buffet, Haichao Liu, Shik Chi Edman Tsang, Dermot O'Hare
Bio-oil, produced by the destructive distillation of cheap and renewable lignocellulosic biomass, contains high energy density oligomers in the water-insoluble fraction that can be utilized for diesel and valuable fine chemicals productions. Here, we show an efficient hydrodeoxygenation catalyst that combines highly dispersed palladium and ultrafine molybdenum phosphate nanoparticles on silica. Using phenol as a model substrate this catalyst is 100% effective and 97.5% selective for hydrodeoxygenation to cyclohexane under mild conditions in a batch reaction; this catalyst also demonstrates regeneration ability in long-term continuous flow tests...
September 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28927639/comparison-of-bio-hydrogen-production-yield-capacity-between-asynchronous-and-simultaneous-saccharification-and-fermentation-processes-from-agricultural-residue-by-mixed-anaerobic-cultures
#6
Yameng Li, Zhiping Zhang, Shengnan Zhu, Huan Zhang, Yang Zhang, Tian Zhang, Quanguo Zhang
Taken common agricultural residues as substrate, dark fermentation bio-hydrogen yield capacity from asynchronous saccharification and fermentation (ASF) and simultaneous saccharification and fermentation (SSF) was investigated. The highest hydrogen yield of 472.75mL was achieved with corncob using ASF. Hydrogen yield from corn straw, rice straw, corncob and sorghum stalk by SSF were 20.54%,10.31%,13.99% and 5.92% higher than ASF, respectively. The experimental data fitted well to the modified Gompertz model...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28927478/molecular-hydrogen-generated-by-elemental-magnesium-supplementation-alters-rumen-fermentation-and-microbiota-in-goats
#7
Min Wang, Rong Wang, XiuMin Zhang, Emilio M Ungerfeld, Donglei Long, HongXiang Mao, JinZhen Jiao, Karen A Beauchemin, Zhiliang Tan
We tested the hypotheses that supplementation of a diet with elemental Mg increases ruminal dissolved H2 (dH2) in rumen fluid, which in turn alters rumen fermentation and microbial community in goats. In a randomised block design, twenty growing goats were allocated to two treatments fed the same basal diet with 1·45 % Mg(OH)2 or 0·6 % elemental Mg. After 28 d of adaptation, we collected total faeces to measure total tract digestibility, rumen contents to analyse fermentation end products and microbial groups, and measured methane (CH4) emission using respiration chambers...
September 20, 2017: British Journal of Nutrition
https://www.readbyqxmd.com/read/28926922/potential-use-and-the-energy-conversion-efficiency-analysis-of-fermentation-effluents-from-photo-and-dark-fermentative-bio-hydrogen-production
#8
Zhiping Zhang, Yameng Li, Huan Zhang, Chao He, Quanguo Zhang
Effluent of bio-hydrogen production system also can be adopted to produce methane for further fermentation, cogeneration of hydrogen and methane will significantly improve the energy conversion efficiency. Platanus Orientalis leaves were taken as the raw material for photo- and dark-fermentation bio-hydrogen production. The resulting concentrations of acetic, butyric, and propionic acids and ethanol in the photo- and dark-fermentation effluents were 2966mg/L and 624mg/L, 422mg/L and 1624mg/L, 1365mg/L and 558mg/L, and 866mg/L and 1352mg/L, respectively...
September 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28926806/simultaneous-removal-of-sulfides-and-benzene-in-fcc-gasoline-by-in-situ-hydrogenation-over-nilain-zro2-r-al2o3
#9
Lei Wang, Qian Liu, Chunyu Jing, Jiajia Yin, Nchare Mominou, Shuzhen Li
The ZrO2-r-Al2O3 composite was developed and co-modified with nickel, lanthanum and indium species by the impregnation method. A fixed-bed reactor was utilized to investigate the activity of the resulting catalysts in the removal of sulfides and benzene in fluid catalytic cracking gasoline. The resultant samples were characterized using XRD, TEM, XPS, TGA, H2-TPR, NH3-TPD and N2 adsorption/desorption techniques. XRD analysis indicated no agglomeration of Ni and La species, in good agreement with the TEM image...
September 6, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28926758/some-aspects-of-the-iodine-metabolism-of-the-giant-kelp-macrocystis-pyrifera-phaeophyceae
#10
Teresa M Tymon, Eric P Miller, Jennifer L Gonzales, Andrea Raab, Frithjof C Küpper, Carl J Carrano
Despite its paramount role in the functioning of coastal ecosystems, relatively little is known about halogen metabolism in giant kelp (Macrocystis pyrifera). This is an important shortcoming given the potential implications for marine and atmospheric chemical processes in the wide distribution range of Macrocystis. The work presented here constitutes the first in depth investigation of the uptake, efflux, and of the physiological function of iodide in this important kelp species. Iodide uptake and efflux rates were measured in adult sporophytes of Macrocystis under normal and stressed (exogenous hydrogen peroxide and an elicitor-triggered oxidative burst) conditions...
September 8, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28926473/hydrogen-gas-attenuates-sevoflurane-neurotoxicity-through-inhibiting-nuclear-factor-%C3%AE%C2%BA-light-chain-enhancer-of-activated-b-cells-signaling-and-proinflammatory-cytokine-release-in-neonatal-rats
#11
Yiwei Shi, Gang Wang, Jinyuan Li, Wenli Yu
Anesthesia neurotoxicity in developing brain has gained increasing attention. However, knowledge regarding its mitigating strategies remains scant. Sevoflurane, a commonly used anesthetic, is responsible for learning and memory deficits in neonates. Molecular hydrogen is reported to be a potential neuroprotective agent because of its antioxidative and anti-inflammatory activities. This study aimed to investigate the effect of hydrogen gas on sevoflurane neurotoxicity. The newborn rats were treated with sevoflurane and/or hydrogen gas for 2 h...
September 18, 2017: Neuroreport
https://www.readbyqxmd.com/read/28926250/the-unimolecular-reactions-of-cf3chf2-studied-by-chemical-activation-assignment-of-rate-constants-and-threshold-energies-to-the-1-2-h-atom-transfer-1-1-hf-elimination-and-1-2-hf-elimination-reactions-and-the-dependence-of-threshold-energies-on-the-number-of
#12
Caleb A Smith, Blanton R Gillespie, George L Heard, Donald W Setser, Bert E Holmes
The recombination of CF3 and CHF2 radicals in a room temperature bath gas was used to prepare CF3CHF2* molecules with 101 kcal mol-1 of vibrational energy. The subsequent 1,2-H-atom transfer, 1,1-HF elimination and 1,2-HF elimination reactions were observed as a function of bath gas pressure by following the CHF3, CF3(F)C: and C2F4 product concentrations by gas chromatography using a mass spectrometer as the detector. The singlet CF3(F)C: concentration was measured by trapping the carbene with trans-2-butene...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28926230/formation-and-characterization-of-hydrogen-boride-sheets-derived-from-mgb2-by-cation-exchange
#13
Hiroaki Nishino, Takeshi Fujita, Nguyen Thanh Cuong, Satoshi Tominaka, Masahiro Miyauchi, Soshi Iimura, Akihiko Hirata, Naoto Umezawa, Susumu Okada, Eiji Nishibori, Asahi Fujino, Tomohiro Fujimori, Shin-Ichi Ito, Junji Nakamura, Hideo Hosono, Takahiro Kondo
Two-dimensional (2D) materials are promising for applications in a wide range of fields because of their unique properties. Hydrogen boride sheets, a new 2D material recently predicted from theory, exhibit intriguing electronic and mechanical properties as well as hydrogen storage capacity. Here, we report the experimental realization of 2D hydrogen boride sheets with an empirical formula of H1B1, produced by exfoliation and complete ion-exchange between protons and magnesium cations in magnesium diboride (MgB2) with an average yield of 42...
September 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28926172/hydrogen-transfer-mediated-a-functionalization-of-1-8-naphthyridines-by-a-strategy-overcoming-the-over-hydrogenation-barrier
#14
Xiuwen Chen, He Zhao, Chunlian Chen, Huanfeng Jiang, Min Zhang
By a hydrogen transfer-mediated activation mode for non-activated pyridyl nucleus, a general catalytic hydrogen transfer-mediated -functionalization of 1,8-naphthyridines is reported for the first time. Its -site selectively couples with the C8-site of various tetrahydroquinolines (THQs) to afford novel -functionalized tetrahydro 1,8-naphthyridines, a class of synthetically useful building blocks and potential candidates for the discovery of therapeutic and bio-active products. The utilization of THQs as inactive hydrogen donors (HDs) appears to be a key strategy to overcome the over-hydrogenation barrier and address the chemo-selectivity issue...
September 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28925703/hydrolysis-of-dimethyl-methylphosphonate-by-the-cyclic-tetramer-of-zirconium-hydroxide
#15
Igor V Schweigert, Daniel Gunlycke
We present hybrid density functional theory (DFT) calculations of hydrolysis of dimethyl methylphosphonate (DMMP) by the cyclic tetramer of zirconium hydroxide [Zr4(OH)16]. Various binding configurations of DMMP and its hydrolysis products on the tetramer as well as transition structures connecting them were explored using structure optimizations based on multiple, randomly selected initial structures. We find that DMMP can bind to the tetramer through the phosphoryl O forming either a strong hydrogen bond to a bridging hydroxyl or a coordinate bond to a coordinatively unsaturated Zr atom...
September 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28925377/applied-upper-airway-resistance-instantly-affects-breath-components-a-unique-insight-into-pulmonary-medicine
#16
Pritam Sukul, Jochen Schubert, Svend Kamysek, Phillip Trefz, Wolfram Miekisch
Respiratory parameters such as flow or rate have complex effects onto exhalation of volatile substances and can hamper clinical interpretation of breath biomarkers. We investigated effects of progressively applied upper-airway resistances onto exhalation of volatile organic compounds (VOCs) in healthy humans. We performed real-time mass-spectrometric determination of breath volatiles in 50 subjects with parallel non-invasive hemodynamic monitoring, breath-resolved spirometry and capnometry during controlled tidal breathing (12 breaths/min)...
September 19, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28925020/one-pot-synthesis-of-size-controllable-core-shell-cds-and-derivative-cds-znxcd1-xs-structures-for-dramatic-photocatalytic-hydrogen-production
#17
Shuangshuang Kai, Baojuan Xi, Yifeng Wang, Shenglin Xiong
Chalcogenide micro/nano composite structures have been attracting world-wide attention due to the enormous prospect of applications in photocatalytic hydrogen production. Well-defined micro/nanostructures, featured with predominant properties, are of extraordinary importance. Herein, we reported a facile one-pot method on synthesis of monodispersed size-controllable CdS and CdS@ZnxCd1-xS core-shell submicrospheres, which were engineered with respect to the structural conformation and size. CdS core-shell submicrospheres with different size were selectively prepared for the first time...
September 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28924945/hydrogen-fluoride-hf-substance-flow-analysis-for-safe-and-sustainable-chemical-industry
#18
Junbeum Kim, Yongwoo Hwang, Mijin Yoo, Sha Chen, Ik-Mo Lee
In this study, the chemical substance flow of hydrogen fluoride (hydrofluoric acid, HF) in domestic chemical industries in 2014 was analyzed in order to provide a basic material and information for the establishment of organized management system to ensure safety during HF applications. A total of 44,751 tons of HF was made by four domestic companies (in 2014); import amount was 95,984 tons in 2014 while 21,579 tons of HF was imported in 2005. The export amount of HF was 2180 tons, of which 2074 ton (China, 1422 tons, U...
September 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28924086/ultrasound-assisted-synthesis-of-hydroxylated-soybean-lecithin-from-crude-soybean-lecithin-as-an-emulsifier
#19
Pranali P Chiplunkar, Amit P Pratap
Soybean lecithin is a by-product obtained during degumming step of crude soybean oil refining. Crude soybean lecithin (CSL) contains major amount of phospholipids (PLs) along with minor amount of acylglycerols, bioactive components, etc. Due to presence of PLs, CSL can be used as an emulsifier. Crude soybean lecithin (CSL) was utilized to synthesize hydroxylated soybean lecithin (HSL) by hydroxylation using hydrogen peroxide and catalytic amount of lactic acid to enhance the hydrophilicity and emulsifying properties of CSL...
September 15, 2017: Journal of Oleo Science
https://www.readbyqxmd.com/read/28924078/partial-hydrogenation-of-sunflower-oil-derived-fames-catalyzed-by-the-efficient-and-recyclable-palladium-nanoparticles-in-polyethylene-glycol
#20
Wei Liu, Guanghui Lu
One approach to improve the oxidative stability of biodiesel is the partial hydrogenation of carbon-carbon double bonds. In the current work, an efficient catalytic system using Pd(OAc)2 dissolved in polyethylene glycol (PEG) which in situ generates palladium nanoparticles was developed in order to promote a selective partial hydrogenation reaction of sunflower oil FAMEs into mono-hydrogenated products avoiding the formation of saturated compounds or trans-isomers. High content of methyl oleate (85.0±1.4%) was obtained by hydrogenation of sunflower oil biodiesel with only 7...
September 15, 2017: Journal of Oleo Science
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