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2.268 Aktuelle Fachpublikationen zum Thema temperature

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Preparation of highly active nickel catalysts supported on mesoporous nanocrystalline γ‐Al2O3 for Methane Autothermal Reforming

25.06.2015 | Soodeh Sepehri, Mehran Rezaei, Chemical Engineering & Technology, 2015

Abstract Autothermal reforming of methane (ATR) was carried out over nanocrystalline Al2O3 supported Ni catalysts with various Ni loadings. Mesoporous nanocrystalline γ‐Al2O3 powder with high specific surface area was prepared by sol‐gel method and employed as support for nickel catalysts. The ...

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Computational and experimental evidence for a new TM–N3/C moiety family in non-PGM electrocatalysts

24.06.2015 | Sadia Kabir; Kateryna Artyushkova; Boris Kiefer; Plamen Atanassov, Physical Chemistry Chemical Physics, 2015

In the present work, we demonstrate that the formation energies of previously unexplored single and double carbon vacancy based TM–N3/C defect moieties are favourable. This prediction suggests that these defect motifs, in particular DV-Fe–N3/C can form during high-temperature catalyst synthesis. ...

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A simple approach to improve the electrocatalytic properties of commercial Pt/C

17.06.2015 | Anthony Peter O'Mullane; Andrew Pearson, Chemical Communication, 2015

Here we demonstrate that commercial carbon supported Pt nanoparticles react with [AuCl4]- ions at room temperature to produce a highly active Au/Pt/C material with an ultralow coverage of elemental Au on the Pt nanoparticles that exhibits significantly enhanced activity for ethanol oxidation when ...

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Methane Adsorption Capacities of the Lower Paleozoic Marine Shales in the Yangtze Platform, South China

17.06.2015 | Yue Wu; Tailiang Fan; Shu Jiang; Xiaoqun Yang; Huaiyu Ding; Miaomiao Meng; Duan Wei, Energy & Fuels, 2015

The adsorption capacities of the Lower Silurian Longamxi and Lower Cambrian Niutitang marine shales in the Yangtze Platform in China were investigated through methane adsorption experiments. The correlations between the adsorption capacities and major factors, e.g., total organic carbon (TOC) ...

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Switchable Copper-Catalyzed Cascade Synthesis of Thiazolidine-2-thiones and Thiazole-2(3H)-thiones

17.06.2015 | Jian-Quan Weng; Bin-Jie Yue; Meng Xu; Yu-Kun Yang; Hong-Wei Jin, Synthesis, 2015

SynthesisDOI: 10.1055/s-0034-1380815 A novel copper-catalyzed cascade synthesis of thiazolidine-2-thiones from N-(2-bromoallyl)amines and carbon disulfide has been developed. The procedure combines carbamodithioic acid formation and copper-catalyzed intramolecular S-vinylation in one sequence. ...

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Gram-Scale Synthesis of Graphene Quantum Dots from Single Carbon Atoms Growth via Energetic Material Deflagration

15.06.2015 | Yousong Liu; Bing Gao; Zhiqiang Qiao; Yingjie Hu; Wenfang Zheng; Long Zhang; Yong Zhou; Guangbin Ji; Guangcheng Yang, Chemistry of Materials, 2015

Graphene quantum dots (GQDs) with quantum confinement and size effect are proposed to be applicable in photovoltaic, nanodevices, and so on, due to extraordinary electronic and optical properties. Here we report a facile approach to synthesize gram-scale GQDs from active carbon atoms, which are ...

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Influence of new thermoplastic sizing agents on the mechanical behavior of poly(ether ketone ketone)/carbon fiber composites

13.06.2015 | Isabelle Giraud, Sophie Franceschi, Emile Perez, Colette Lacabanne, Eric Dantras, Journal of Applied Polymer Science, 2015

ABSTRACT In this study, unidirectional poly(ether ether ketone)/carbon fiber (CF) composite sheets were elaborated with unsized, epoxy‐sized, and thermoplastic‐sized CFs by hot‐press molding. The thermoplastic sizings that we used were poly(ether imide) (PEI) and poly(ether ketone ketone) ...

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Nickel‐Catalyzed Alkyl–Alkyl Cross‐Couplings of Fluorinated Secondary Electrophiles: A General Approach to the Synthesis of Compounds having a Perfluoroalkyl Substituent

12.06.2015 | Yufan Liang, Gregory C. Fu, Angewandte Chemie International Edition, 2015

Abstract Fluorinated organic molecules are of interest in fields ranging from medicinal chemistry to polymer science. Described herein is a mild, convenient, and versatile method for the synthesis of compounds bearing a perfluoroalkyl group attached to a tertiary carbon atom by using an ...

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Nickel‐Catalyzed Alkyl–Alkyl Cross‐Couplings of Fluorinated Secondary Electrophiles: A General Approach to the Synthesis of Compounds having a Perfluoroalkyl Substituent

12.06.2015 | Yufan Liang, Gregory C. Fu, Angewandte Chemie, 2015

Abstract Fluorinated organic molecules are of interest in fields ranging from medicinal chemistry to polymer science. Described herein is a mild, convenient, and versatile method for the synthesis of compounds bearing a perfluoroalkyl group attached to a tertiary carbon atom by using an ...

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Formation of Cuboidal Co3AlC Precipitates in Carbon‐Containing Co–Al–W‐Based Superalloys

11.06.2015 | Lisa Patricia Freund, Alexander Bauer, Lisa Benker, Steffen Neumeier, Mathias Göken, Advanced Engineering Materials, 2015

The influence of Carbon addition on a ternary Co–Al–W alloy is investigated especially regarding phase stability and partitioning behavior of alloying elements. During casting and subsequent cooling, C‐additon leads to the formation of an interdendritic carbide network and to the homogeneous ...

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