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2.564 Aktuelle Fachpublikationen zum Thema temperature

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Adsorption and interaction of CO2 on rutile TiO2(110) surfaces: a combined UHV-FTIRS and theoretical simulation study

02.09.2015 | Yunjun Cao; Shujun Hu; Min Yu; Shishen Yan; Mingchun Xu, Physical Chemistry Chemical Physics, 2015

CO2 adsorption and interaction on rutile TiO2(110) surfaces was studied by UHV-FTIRS combined with theoretical simulations. With increasing CO2 exposure, CO2 adsorbs in succession at the oxygen vacancy (Vo) sites, on the five-coordinated Ti cation (Ti5c) sites and the bridging oxygen (Obr) sites ...


Stability of Fe‐N‐C Catalysts in Acidic Medium Studied by Operando Spectroscopy

28.08.2015 | Chang Hyuck Choi, Claudio Baldizzone, Jan‐Philipp Grote, Anna K. Schuppert, Frédéric Jaouen, Karl J. J. Mayrhofer, Angewandte Chemie International Edition, 2015

Abstract Fundamental understanding of non‐precious metal catalysts for the oxygen reduction reaction (ORR) is the nub for the successful replacement of noble Pt in fuel cells and, therefore, of central importance for a technological breakthrough. Herein, the degradation mechanisms of a model ...


Highly Ordered Mesoporous Cobalt-Containing Oxides: Structure, Catalytic Properties, and Active Sites in Oxidation of Carbon Monoxide

28.08.2015 | Dong Gu; Chun-Jiang Jia; Claudia Weidenthaler; Hans-Josef Bongard; Bernd Spliethoff; Wolfgang Schmidt; Ferdi Schüth, Journal of the American Chemical Society, 2015

Co3O4 with a spinel structure is a very active oxide catalyst for the oxidation of CO. In such catalysts, octahedrally coordinated Co3+ is considered to be the active site, while tetrahedrally coordinated Co2+ is assumed to be basically inactive. In this study, a highly ordered mesoporous CoO has ...


ChemInform Abstract: Iron Carbide Nanoparticles Encapsulated in Mesoporous Fe‐N‐Doped Carbon Nanofibers for Efficient Electrocatalysis.

27.08.2015 | Zhen‐Yu Wu, Xing‐Xing Xu, Bi‐Cheng Hu, Hai‐Wei Liang, Yue Lin, Li‐Feng Chen, Shu‐Hong Yu, ChemInform, 2015

Abstract A new catalyst for the oxygen reduction reaction in fuel cells and metal—air batteries is prepared from aqueous solutions of carbonaceous nanofibers, pyrrole, and FeCl3 (room temperature, 4 h, followed by pyrolysis under flowing N2).


Fracture Behavior of Woven Silicon Carbide Fibers Exposed to High‐Temperature Nitrogen and Oxygen Plasmas

26.08.2015 | Walten Owens, Daniel Merkel, Frederic Sansoz, Douglas Fletcher, Journal of the American Ceramic Society, 2015

High‐temperature aero‐thermal heating in a 30kW inductively coupled plasma torch was used to replicate the effects of harsh oxidizing environments during hypersonic atmospheric entry on fracture behavior and microstructure of two‐dimensional woven SiC fibers. Hi‐Nicalon SiC woven cloths were ...


Fluidizable NiO/Ce-γAl2O3 Oxygen Carrier for Chemical Looping Combustion

26.08.2015 | Shamseldin A. Mohamed; Mohammad R. Quddus; Shaikh A. Razzak; Mohammad M. Hossain; Hugo I. de Lasa, Energy & Fuels, 2015

This communication presents the effects of Ce modification on NiO/Ce-γAl2O3 oxygen carrier for chemical-looping combustion (CLC). The NiO/Ce-γAl2O3 samples are prepared by an incipient wetness technique using successive metal loading. The reduction characteristics of the prepared oxygen carriers ...


Effects of annealing on optical and structural properties of zinc oxide nanocrystals

25.08.2015 | Sevak Khachadorian, Roland Gillen, Sumin Choi, Cuong Ton‐That, André Kliem, Janina Maultzsch, Matthew R. Phillips, A ..., physica status solidi (b), 2015

Abstract The optical and vibrational properties of zinc oxide nanocrystals (ZnO NCs), grown by chemical precipitation method, were investigated following thermal annealing treatments in oxygen, argon, and zinc vapors at temperatures up to C. Raman scattering and photoluminescence techniques ...


On Thermal and Spectroscopic Studies of Poly(ethylene oxide)/Poly(methyl methacrylate) Blends with Lithium Perchlorate

25.08.2015 | Siti Rozana Abd Karim, Lai Har Sim, Chin Han Chan, Hairunnisa Ramli, Macromolecular Symposia, 2015

Summary In this study, thermal properties and ion‐polymer interactions of lithium perchlorate (LiClO4) in poly(ethylene oxide)/poly(methyl methacrylate) (PEO/PMMA) blend prepared by solution casting technique were elucidated. The spectroscopic studies of the salt‐free and salt‐doped PEO/PMMA ...


Mechanical Improvement of Poly(butylene succinate) with Polyamide Short Fibers

25.08.2015 | Nattakarn Hongsriphan, Witsarut Muangrak, Kanruthai Soonthornvacharin, Thanchanok Tulaphol, Macromolecular Symposia, 2015

Summary This research prepared polymer blend between poly(butylene succinate) (PBS) and polyamide‐6 (PA‐6) short fibers using solid‐melt mixing method. Temperature profile of a twin‐screw extruder was set in a fashion that only PBS was melted during the blending. Effect of short fiber content ...


Ultralow Loading of Silver Nanoparticles on Mn2O3 Nanowires Derived with Molten Salts: A High-Efficiency Catalyst for the Oxidative Removal of Toluene

25.08.2015 | Jiguang Deng; Shengnan He; Shaohua Xie; Huanggen Yang; Yuxi Liu; Guangsheng Guo; Hongxing Dai, Environmental Science & Technology, 2015

Using a mixture of NaNO3 and NaF as molten salt and MnSO4 and AgNO3 as metal precursors, 0.13 wt % Ag/Mn2O3 nanowires (0.13Ag/Mn2O3-ms) were fabricated after calcination at 420 °C for 2 h. Compared to the counterparts derived via the impregnation and poly(vinyl alcohol)-protected reduction routes ...


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