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2.084 Aktuelle Fachpublikationen zum Thema temperature

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Catalytic hydrogen production from paraformaldehyde and water using an organoiridium complex

28.02.2015 | Tomoyoshi Suenobu; Yusuke Isaka; Satoshi Shibata; Shunichi Fukuzumi, Chemical Communication, 2015

Paraformaldehyde was decomposed using an organoiridium complex (1, [IrIII(Cp*)(4-(1H-pyrazol-1-yl-κN2)benzoic acid-κC3)(H2O)]2SO4) as a catalyst in water to produce H2 and CO2 in a 2 [ ] : [ ] 1 molar ratio at room temperature. The catalytic cycle is composed of the reduction of 1 by ...

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Surface controlled reduction kinetics of nominally undoped polycrystalline CeO2

27.02.2015 | Nicole Knoblauch; Lars Dörrer; Peter Fielitz; Martin Schmücker; Günter Borchardt, Physical Chemistry Chemical Physics, 2015

Ceria is an interesting material for high temperature redox applications like solar-thermal splitting of CO2 and H2O. Technical implementation and reactor design for solar-thermal redox-based fuel generation requires reliable data for the chemical surface exchange coefficient and the chemical ...

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Crystal and magnetic structures of the brownmillerite Ca2Cr2O5

27.02.2015 | Angel M. Arevalo-Lopez; J. Paul Attfield, Dalton Transactions, 2015

Powder neutron diffraction and magnetic susceptibility measurements at 10–300 K have been used to determine the crystal and magnetic structures of brownmillerite type Ca2Cr2O5, which was obtained by reduction of the high pressure phase CaCrO3 through hard–soft chemistry. The ambient temperature ...

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Mild Deoxygenation of Aromatic Ketones and Aldehydes over Pd/C Using Polymethylhydrosiloxane as the Reducing Agent

26.02.2015 | Alexey Volkov, Karl P. J. Gustafson, Cheuk‐Wai Tai, Oscar Verho, Jan‐E. Bäckvall, Hans Adolfsson, Angewandte Chemie International Edition, 2015

Abstract Herein, a practical and mild method for the deoxygenation of a wide range of benzylic aldehydes and ketones is described, which utilizes heterogeneous Pd/C as the catalyst together with the green hydride source, polymethylhydrosiloxane. The developed catalytic protocol is scalable and ...

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Stepwise Reduction of Electrochemically Lithiated Core–Shell Heterostructures Based on the Prussian Blue Analogue Coordination Polymers K0.1Cu[Fe(CN)6]0.7·3.5H2O and K0.1Ni[Fe(CN)6]0.7·4.4H2O

23.02.2015 | Carissa H. Li; Marcus K. Peprah; Daisuke Asakura; Mark W. Meisel; Masashi Okubo; Daniel R. Talham, Chemistry of Materials, 2015

The magnetic properties of a series of core–shell particles based on the Prussian blue analogues K0.1Cu[Fe(CN)6]0.7·3.5H2O and K0.1Ni[Fe(CN)6]0.7·4.4H2O (CuFe-PBA@NiFe-PBA) are investigated as a function of electrochemical titration and lithium ion insertion. The particles, with average size 305 ...

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Thermodynamics of Water Dimer Dissociation in the Primary Hydration Shell of the Iodide Ion with Temperature-Dependent Vibrational Predissociation Spectroscopy

20.02.2015 | Conrad T. Wolke; Fabian S. Menges; Niklas Tötsch; Olga Gorlova; Joseph A. Fournier; Gary H. Weddle; Mark A. Johnson; ..., Journal of Physical Chemistry A, 2015

The strong temperature dependence of the I–·(H2O)2 vibrational predissociation spectrum is traced to the intracluster dissociation of the ion-bound water dimer into independent water monomers that remain tethered to the ion. The thermodynamics of this process is determined using van’t Hoff ...

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Asymmetric Base‐Free Michael Addition at Room Temperature with Nickel‐Based Bifunctional Amido‐Functionalized N‐Heterocyclic Carbene Catalysts

16.02.2015 | Mitta Nageswar Rao, Meera Haridas, Manoj Kumar Gangwar, Palanisamy Rajakannu, Alok Ch. Kalita, Prasenjit Ghosh, European Journal of Inorganic Chemistry, 2015

Abstract A series of nickel‐based chiral bifunctional catalysts (1d–3d) with N‐heterocyclic carbene (NHC) ligands derived from (1R)‐(–)‐menthol, (1S)‐(–)pinene, and (1R)‐(+)‐camphor have been successfully designed for asymmetric Michael addition reactions under base‐free conditions. The NHC ...

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Effect of Temperature and Pressure on the Kinetics of the Oxygen Reduction Reaction

16.02.2015 | Edmund C. M. Tse; Andrew A. Gewirth, Journal of Physical Chemistry A, 2015

Fundamental understanding of the oxygen reduction reaction in aqueous medium at temperatures above 100 °C is lacking due to the practical limitations related to the harsh experimental conditions. In this work, the challenge to suppress water from boiling was overcome by conducting the ...

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The square‐planar to flattened‐tetrahedral CuX42− (X = Cl, Br) structural phase transition in 1,2,6‐trimethylpyridinium salts

04.02.2015 | Annette Kelley, Sowjanya Nalla, Marcus R. Bond, Acta Crystallographica Section B, 2015

The abrupt green‐to‐yellow thermochromism observed for certain A2CuCl4 compounds has long been attributed to the presence of strong N—H hydrogen bonding in the low‐temperature phase that favors square‐planar CuCl42− (green in color) through reduction of ligand–ligand repulsion. Weakening of the ...

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Metal Redox Processes for the Controlled Synthesis of Metal Alloy Nanoparticles

04.02.2015 | Alec Kirkeminde, Stan Spurlin, Laura Draxler‐Sixta, Jamie Cooper, Shenqiang Ren, Angewandte Chemie International Edition, 2015

Abstract Nanocrystalline metals have received widespread interest and found various applications owing to their magnetic and catalytic properties and in energy‐related fields. A flexible approach for the growth of nanoalloys with controlled properties and well‐defined structures on the atomic ...

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