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Hernandez Rodriguez M.J.,University of Las Palmas de Gran Canaria | Pulido Melian E.,University of Las Palmas de Gran Canaria | Gonzalez Diaz O.,University of Las Palmas de Gran Canaria | Arana J.,University of Las Palmas de Gran Canaria | And 3 more authors.
Journal of Molecular Catalysis A: Chemical

A comparison is made in this study of the effectiveness of various commercial catalysts in the oxidation of NOx by heterogeneous photocatalysis. The following catalysts were considered: Aeroxide TiO2 P25, Aeroxide TiO2 P90, Hombikat UV-100, Kronos vlp7000, CristalACTIV PC105, CristalACTIV PC500, Kemira 650 and Anatasa Aldrich. All catalysts were deposited by a dip-coating technique onto borosilicate 3.3 glass plates. Optimization of catalyst load showed no significant enhancement of photoactivity, in general, above a deposited mass of 1.16 mg cm-2. Differences between photocatalyst activity were more apparent at longer illumination times. Photoactivity decreased in the presence of humidity and differences in the adsorbed products were detected. Photocatalyst activity was strongly influenced by specific surface area, with the best results obtained by the catalysts with the largest surface area, namely the PC500, Hombikat and Kronos. Photocatalyst stability was demonstrated in successive reuse cycles. © 2015 Elsevier B.V. All rights reserved. Source

Amelines-Sarria O.,National Autonomous University of Mexico | Dos Santos Claro P.C.,CONICET | Schilardi P.L.,CONICET | Blum B.,CONICET | And 7 more authors.
Organic Electronics: physics, materials, applications

The magnetic and electronic properties of thin C60 films (film thickness ≥4 ML) grown by sublimation in vacuum on oxidized Si, Au, highly oriented pyrolytic graphite and glass, and subsequently exposed to ambient conditions, are investigated by using a multitechnique approach. The films exhibit a structure consisting of nanometric aggregates, whose size increases with film thickness, irrespective of the substrate, although larger aggregates are found on Au substrates. The XPS data indicate no significant degradation of the C60 films, even though significant amounts of oxygen are present. Magnetic properties are characteristic of C60 films exposed to oxygen and light. In contrast, STS measurements show that the local electronic properties are similar to those reported for ultrathin films grown on the same substrates under vacuum. A detailed discussion on the effects of film-thickness and substrate-type on the C60 film properties, under ambient conditions, is presented. © 2011 Elsevier B.V. All rights reserved. Source

Guillen-Villafuerte O.,Instituto Universitario Of Materiales notecnologia | Garcia G.,Instituto Universitario Of Materiales notecnologia | Garcia G.,CSIC - Institute of Catalysis | Rodriguez J.L.,Instituto Universitario Of Materiales notecnologia | And 4 more authors.
International Journal of Hydrogen Energy

The present study is focused on the influence of Pt loading on the reactivity of catalysts prepared supporting the metal on novel core-shell molybdenum substrates. The electrocatalytic activity and stability of nine Pt/X@MoO3/C catalysts (where X denotes the nature of Mo-phases in the core of the core-shell Mo-particle: Mo2C, MoO2 and/or Mo 0) with three Pt loading (5, 20 and 30 wt% Pt) were tested for carbon monoxide and methanol electro-oxidation reactions. For both reactions, Pt loading appears to be a key factor, obtaining the best performance for those catalysts with higher Pt content. Furthermore, it is observed that the nature of X@MoO3/C samples plays an important role as promoter for CO and methanol oxidation. MoO3-shell catalyzes and homogenizes the potentiodynamic responses, while the reduced Mo-phase in the core produces an electronic effect which determines the catalytic activity and stability during the electro-oxidation processes investigated. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights. Source

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