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2.209 Aktuelle Fachpublikationen zum Thema temperature

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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 ...

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Conjugated Cofactor Enables Efficient Temperature-Independent Electronic Transport Across ∼6 nm Long Halorhodopsin

27.08.2015 | Sabyasachi Mukhopadhyay; Sansa Dutta; Israel Pecht; Mordechai Sheves; David Cahen, Journal of the American Chemical Society, 2015

We observe temperature-independent electron transport, characteristic of tunneling across a ∼6 nm thick Halorhodopsin (phR) monolayer. phR contains both retinal and a carotenoid, bacterioruberin, as cofactors, in a trimeric protein-chromophore complex. This finding is unusual because for ...

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Atomic Layer Deposition of FeO on Pt(111) by Ferrocene Adsorption and Oxidation

27.08.2015 | Rajib Paul; Ronald G. Reifenberger; Timothy S. Fisher; Dmitry Y. Zemlyanov, Chemistry of Materials, 2015

We report the synthesis of a submonolayer film of FeO(111) on the Pt(111) surface using atomic layer deposition under well-defined ultrahigh vacuum (UHV) conditions. FeO islands were characterized by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy, and high-resolution ...

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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 ...

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Flow Pattern Effects on the Oxidation Deposition Rate of Aviation Kerosene

25.08.2015 | Xinyan Pei; Lingyun Hou; Zhuyin Ren, Energy & Fuels, 2015

The thermal stability characteristics of aviation kerosene were investigated using a heated tube at a constant heat power of 1087 W, mass flow rate of 1 g/s, and supercritical pressure of 3 MPa. Deposition rates on the tube walls were measured by weight. Each test lasts for 105 min. The inner ...

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A Biomimetic Mechanism for the Copper-Catalyzed Aerobic Oxygenation of 4-tert-Butylphenol

24.08.2015 | Mohammad S. Askari; Kenneth Virgel N. Esguerra; Jean-Philip Lumb; Xavier Ottenwaelder, Inorganic Chemistry, 2015

Controlling product selectivity during the catalytic aerobic oxidation of phenols remains a significant challenge that hinders reaction development. This work provides a mechanistic picture of a Cu-catalyzed, aerobic functionalization of phenols that is selective for phenoxy-coupled ...

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A Tale of Copper Coordination Frameworks: Controlled Single‐Crystal‐to‐Single‐Crystal Transformations and Their Catalytic CH Bond Activation Properties

21.08.2015 | Yifa Chen, Xiao Feng, Xianqiang Huang, Zhengguo Lin, Xiaokun Pei, Siqing Li, Jikun Li, Shan Wang, Rui Li, Bo Wang, Chemistry - A European Journal, 2015

Abstract Metal–organic frameworks (MOFs), as a class of microporous materials with well‐defined channels and rich functionalities, hold great promise for various applications. Yet the formation and crystallization processes of various MOFs with distinct topology, connectivity, and properties ...

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Spectroscopic Investigation of the Coloration and Fabrication Conditions of Medieval Blue Glasses

21.08.2015 | Myrtille Hunault, Fanny Bauchau, Claudine Loisel, Michel Hérold, Laurence Galoisy, Matthew Newville, Georges Calas, Journal of the American Ceramic Society, 2015

Potash‐ and soda‐lime‐stained glasses from the 12th–13th centuries, blue‐colored by cobalt, have been investigated by Mn, Fe, and Cu K‐edge X‐ray and optical absorption spectroscopies in order to determine the oxidation state of these elements and their impact on the blue color. Remelting these ...

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ChemInform Abstract: Catalytic System for Pyridine Oxidation to N‐Oxides under Mild Conditions Based on Polyoxomolybdate.

20.08.2015 | Chunxia Yang, Wei Zhao, Zhiguo Cheng, Baomin Luo, Dongqin Bi, ChemInform, 2015

Abstract Keplerate polyoxomolybdate is an effective catalyst for the N‐oxidation of pyridines and quinolines by H2O2 at room temperature.

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Enantioselective aerobic oxidation of olefins by magnetite nanoparticles at room temperature: a chiral carboxylic acid strategy

19.08.2015 | Leila Hadian-Dehkordi; Hassan Hosseini-Monfared, Green Chemistry, 2015

Asymmetric oxidations of organic compounds are limited in their synthetic scope and by practical factors, such as the use of complex catalyst synthesis. A simple and cheap nanostructured catalyst system comprising magnetite nanoparticles stabilized by L-(+)-tartaric acid (Fe3O4/tart-NPs) were ...

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