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Oxidation of refractory sulfur-containing compounds with molecular oxygen catalyzed by vanadoperiodate

16-12-2014 | Nanfang Tang; Zongxuan Jiang; Can Li, Green Chemistry, 2014

A new vanadoperiodate [HIV9O28]3− has been synthesized by a simple, one-pot stoichiometric reaction of HIO4·2H2O with NaVO3 in aqueous solution and then isolated as [C8H17N(CH3)3]3HIV9O28 by cation exchange. We have found that [C8H17N(CH3)3]3HIV9O28 shows high catalytic activity in the oxidation ...

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Multielement Crystalline and Pseudocrystalline Oxides as Efficient Catalysts for the Direct Transformation of Glycerol into Acrylic Acid

08-12-2014 | Alessandro Chieregato, M. Dolores Soriano, Ester García‐González, Giuseppe Puglia, Francesco Basile, Patricia Concep ..., ChemSusChem, 2014

Abstract Glycerol surplus from biodiesel synthesis still represents a major problem in the biofuel production chain. Meanwhile, those in the acrylic acid market are looking for new processes that are able to offer viable alternatives to propylene‐based production. Therefore, acrylic acid ...

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Materials, Vol. 7, Pages 7737-7751: Surface Characteristics and Catalytic Activity of Copper Deposited Porous Silicon Powder

04-12-2014 | Halim, Muhammad Yusri Abdul; Tan, Wei Leng; Bakar, Noor Hana Hanif Abu; Bakar, Mohamad Abu, Materials, 2014

Porous structured silicon or porous silicon (PS) powder was prepared by chemical etching of silicon powder in an etchant solution of HF: HNO3: H2O (1:3:5 v/v). An immersion time of 4 min was sufficient for depositing Cu metal from an aqueous solution of CuSO4 in the presence of HF. Scanning ...

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Metal‐Catalyst‐Free Carbohydrazide Fuel Cells with Three‐Dimensional Graphene Anodes

03-12-2014 | Ji Qi, Neeva Benipal, Hui Wang, David J. Chadderdon, Yibo Jiang, Wei Wei, Yun Hang Hu, Wenzhen Li, ChemSusChem, 2014

Abstract As a potential solution to concerns on sustainable energy, the wide spread commercialization of fuel cell has long been hindered by limited reserves and relatively high costs of metal catalysts. 3D graphene, a carbon‐only catalyst prepared by reduction of carbon monoxide with lithium ...

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Bio‐Based Nitriles from the Heterogeneously Catalyzed Oxidative Decarboxylation of Amino Acids

03-12-2014 | Laurens Claes, Roman Matthessen, Ine Rombouts, Ivo Stassen, Trees De Baerdemaeker, Diederik Depla, Jan A. Delcour, B ..., ChemSusChem, 2014

Abstract The oxidative decarboxylation of amino acids to nitriles was achieved in aqueous solution by in situ halide oxidation using catalytic amounts of tungstate exchanged on a [Ni,Al] layered double hydroxide (LDH), NH4Br, and H2O2 as the terminal oxidant. Both halide oxidation and ...

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Greenlighting Photoelectrochemical Oxidation of Water by Iron Oxide

03-12-2014 | Dong Wook Kim; Shannon C. Riha; Erica J. DeMarco; Alex B. F. Martinson; Omar K. Farha; Joseph T. Hupp, ACS Nano, 2014

Hematite (α-Fe2O3) is one of just a few candidate electrode materials that possess all of the following photocatalyst-essential properties for scalable application to water oxidation: excellent stability, earth-abundance, suitability positive valence-band-edge energy, and significant visible ...

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Deposition and characterization of TiAlSiN coatings prepared by hybrid PVD coating system

01-12-2014 | Jinfeng Wu, Nairu He, Hongxuan Li, Xiaohong Liu, Li Ji, Xiaopeng Huang, Jianmin Chen, Surface and Interface Analysis, 2014

TiAlSiN coatings with different Si contents were deposited on silicon and high‐temperature alloy by using a hybrid physical vapor deposition coating system, where the cathodic arc ion plating was combined with a twin target mid‐frequency magnetron sputtering. The chemical composition, ...

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Proton-Coupled Electron Transfer in Tyrosine and a β-Hairpin Maquette: Reaction Dynamics on the Picosecond Time Scale

01-12-2014 | Cynthia V. Pagba; San-Hui Chi; Joseph Perry; Bridgette A. Barry, Journal of Physical Chemistry B, 2014

In proteins, proton-coupled electron transfer (PCET) can involve the transient oxidation and reduction of the aromatic amino acid tyrosine. Due to the short life time of tyrosyl radical intermediates, transient absorption spectroscopy provides an important tool in deciphering electron-transfer ...

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Corrosion resistance of titanium dioxide anodic coatings on Ti–6Al–4V

27-11-2014 | M. L. Vera, E. Linardi, L. Lanzani, C. Mendez, C. E. Schvezov, A. E. Ares, Materials and Corrosion, 2014

The Ti–6Al–4V alloy is used for biomedical implants due to its corrosion resistance and biocompatibility, associated with the spontaneous formation of TiO2 oxide. However, the native film may be flawed and after some time of implantation in the body it may release metal ions. Oxides of higher ...

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Corrosion behavior of TiO2‐coated Ti–6Al–7Nb surfaces obtained by anodic oxidation in sulfuric or acetic acid

27-11-2014 | N. Cotolan, A. Pop, D. Marconi, O. Ponta, L. M. Muresan, Materials and Corrosion, 2014

The morpho‐structural and electrochemical properties of the oxide film formed on the implants surface play a decisive role for the bio‐compatibility of titanium‐based prosthesis. The aim of the present work is to investigate and compare the corrosion behavior of titanium dioxide (TiO2) coated ...

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