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Browsing by Subject "Platinum"

Now showing items 1-20 of 22

A Ligand-Free Pt3 Cluster Catalyzes the Markovnikov Hydrosilylation of Alkynes with up to 106 Turnover Frequencies

Rivero-Crespo, Miguel Ángel; Leyva Perez, Antonio; Corma Canós, Avelino (John Wiley & Sons, 2017)

[EN] The Pt-catalyzed hydrosilylation of alkynes is the procedure of choice to obtain vinylsilanes, and is claimed to be the most relevant application of Pt in organic synthesis. More than half a century after its discovery, ...
A method of pulse array design for voltammetric electronic tongues

Campos Sánchez, Inmaculada; Alcañiz Fillol, Miguel; Masot Peris, Rafael; Soto Camino, Juan; Martínez Mañez, Ramón; Vivancos, José-Luís; Gil Sánchez, Luís (Elsevier, 2012-01-03)

This paper proposes a reasonable methodology for the design of pulse arrays applied in classification and quantification techniques based on the use of pulse voltammetric electronic tongues. As model problem we designed a ...
A novel humid electronic nose combined with an electronic tongue for assessing deterioration of wine

Gil Sánchez, Luís; Soto Camino, Juan; Martínez Mañez, Ramón; García Breijo, Eduardo; Ibáñez Civera, Francisco Javier; Llobet Valero, Eduard (Elsevier, 2011-11)

We report herein the use of a combined system for the analysis of the spoilage of wine when in contact with air. The system consists of a potentiometric electronic tongue and a humid electronic nose. The potentiometric ...
Characterization of azo dyes on Pt and Pt/polyaniline/dispersed Pt electrodes

Molina Puerto, Javier; Fernández Sáez, Javier; Del Río García, Ana Isabel; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier (Elsevier, 2012-06-15)

The electrochemical characterization of two organic dyes (amaranth and procion orange MX-2R) has been performed on Pt electrodes and Pt electrodes coated with polyaniline and dispersed Pt. Electrodes with different Pt loads ...
Controllable synthesis of metal nanoparticles for catalytic applications

Liu, Lichen (Universitat Politècnica de València, 2015-02-24)

[EN] In this thesis, I have discussed the synthesis of Cu nanoparticles and their applications in C-N coupling reactions. I find that Cu nanoparticles will decompose into Cu clusters and Cu clusters are the real active ...
Design of an electronic system and its application to electronic tongues using variable amplitude pulse voltammetry and impedance spectroscopy

Alcañiz Fillol, Miguel; Vivancos, José-Luís; Masot Peris, Rafael; Ibáñez Civera, Francisco Javier; Raga Ramón, María; Soto Camino, Juan; Martínez Mañez, Ramón (Elsevier, 2012-07)

Electronic equipment (IDM-1) especially designed for the application of voltammetric and impedometric electronic tongues is described. For impedance spectroscopy the equipment permits the generation of sinusoidal signals ...
Determination of the Evolution of Heterogeneous Single Metal Atoms and Nanoclusters under Reaction Conditions: Which Are the Working Catalytic Sites?

Liu, Lichen; MEIRA, DEBORA M.; Arenal, Raul; Concepción Heydorn, Patricia; Puga, Alberto V.; Corma Canós, Avelino (American Chemical Society, 2019-12-06)

[EN] Identification of active sites in heterogeneous metal catalysts is critical for understanding the reaction mechanism at the molecular level and for designing more efficient catalysts. Because of their structural ...
Electrochemical treatment of a synthetic wastewater containing a sulphonated azo dye. Determination of naphthalenesulphonic compunds produced as main by-products

Del Río García, Ana Isabel; Fernández Sáez, Javier; Molina Puerto, Javier; Bonastre Cano, José Antonio; Cases Iborra, Francisco Javier (Elsevier, 2011-06-15)

The electrochemical treatment of wastewaters from textile industry is a promising technique for substances which are resistant to biodegradation. This paper deals with the electrochemical decolourisation/degradation of ...
Electron Emission of Pt: Experimental Study and Comparison With Models in the Multipactor Energy Range

Bronchalo, Enrique; Coves, Angela; Mata Sanz, Rafael; Gimeno Martinez, Benito; Montero, Isabel; Galán, Luis; Boria Esbert, Vicente Enrique; Mercadé-Morales, Laura; Sanchis Kilders, Esteban (Institute of Electrical and Electronics Engineers (IEEE), 2016-08)

Experimental data of secondary emission yield (SEY) and electron emission spectra of Pt under electron irradiation for normal incidence and primary energies lower than 1 keV are presented. Several relevant magnitudes, as ...
Ferric sludge derived from the process of water purification as an efficient catalyst and/or support for the removal of volatile organic compounds

Sanchis, Rut; Dejoz, Ana; Vázquez, Isabel; Vilarrasa-García, Enrique; Jiménez-Jiménez, José; Rodríguez-Castellón, Enrique; López Nieto, José Manuel; Solsona, Benjamín (Elsevier, 2019-03)

[EN] Ferric chloride solutions are used as coagulants or flocculants in water treatment operations for human consumption. This treatment produces large amounts of clay-type solids formed mainly of montmorillonite with ...
Furfural Hydrogenation on Modified Niobia

Jouve, Andrea; Cattaneo, Stefano; Delgado-Muñoz, Daniel; Scotti, Nicola; Evangelisti, Claudio; López Nieto, José Manuel; Prati, Laura (MDPI AG, 2019-06-01)

[EN] In this study, niobia-based materials have been used as supports for Pt nanoparticles and used in the hydrogenation of furfural. The incorporation of dopants (W6+ and Ti4+) in the Nb2O5 structure induced modifications ...
Low-Temperature Catalytic NO Reduction with CO by Subnanometric Pt Clusters

Fernández-Villanueva, Estefanía; Liu, Lichen; Boronat Zaragoza, Mercedes; Arenal, Raul; Concepción Heydorn, Patricia; Corma Canós, Avelino (American Chemical Society, 2019-12-06)

[EN] The catalytic subnanometric metal clusters with a few atoms can be regarded as an intermediate state between single atoms and metal nanoparticles (>1 nm). Their molecule-like electronic structures and flexible geometric ...
Metal-Specific Reactivity in Single-Atom Catalysts: CO Oxidation on 4d and 5d Transition Metals Atomically Dispersed on MgO

Sarma, Bidyut B.; Plessow, Philipp N.; Agostini, Giovanni; Concepción Heydorn, Patricia; Pfänder, Norbert; Kang, Liqun; Wang, Feng R.; Studt, Felix; Prieto González, Gonzalo (American Chemical Society, 2020-09-02)

[EN] Understanding and tuning the catalytic properties of metals atomically dispersed on oxides are major stepping-stones toward a rational development of single-atom catalysts (SACs). Beyond individual showcase studies, ...
One-Pot Selective Catalytic Synthesis of Pyrrolidone Derivatives from Ethyl Levulinate and Nitro Compounds

Vidal, Juan D; Climent Olmedo, María José; Corma Canós, Avelino; Concepción Heydorn, Patricia; Iborra Chornet, Sara (John Wiley & Sons, 2017)

[EN] N-substituted 5-methyl-2-pyrrolidones were prepared in a one-pot process starting from ethyl levulinate and nitro compounds in the presence of a nanosized Pt-based catalyst. Pt supported on TiO2 nanotubes (Pt/TiO2-NT) ...
Preparación y caracterización de catalizadores para pila de membrana de intercambio protónico

Blanco Redondo, Lucinda (Universitat Politècnica de València, 2020-06-01)

[ES] En la actualidad, la creciente demanda de energía, el agotamiento de los combustibles fósiles y las consecuencias negativas de su uso hacen necesario el desarrollo de nuevas tecnologías que palíen la situación de un ...
Similarities and Differences between the "Relativistic" Triad Gold, Platinum, and Mercury in Catalysis

Leyva Perez, Antonio; Corma Canós, Avelino (Wiley-VCH Verlag, 2012)

[EN] Relativistic effects in the valence shell of the elements reach a maximum in the triad Pt¿Au¿Hg and determine their catalytic activity in organic reactions. In this Review we examine the catalytic activity of Pt, ...
Stereoselective single (copper) or double (platinum) boronation of alkynes catalyzed by magnesia-supported copper oxide or platinum nanoparticles

Grirrane, Abdessamad; Corma Canós, Avelino; García Gómez, Hermenegildo (Wiley-VCH Verlag, 2011-02-18)

Copper(II) oxide nanoparticles supported on magnesia have been prepared from CuII supported on magnesia by hydrogen reduction at 400°C followed by storage under ambient conditions. X-ray photoelectron spectroscopy of the ...
The role of formic acid/formate equilibria in the oxidation of formic acid on Pt(111)

Busó-Rogero, Carlos; Ferre-Vilaplana, Adolfo; Herrero, Enrique; Feliu, Juan M. (Elsevier, 2019-01)

[EN] The formic acid oxidation reaction has been studied in concentrated perchloric acid solutions (up to 9.14M (60%)) on the Pt (111) surface to explore the relationships between interfacial properties and kinetics. It ...
Theoretical Study of the Geometrical, Electronic and Catalytic properties of Metal Clusters and Nanoparticles

Fernández Villanueva, Estefanía (Universitat Politècnica de València, 2020-01-20)

[ES] Dado su tamaño subnanométrico, los clusters metálicos están regidos por el confinamiento cuántico, lo que les hace más "moleculares" y menos "metálicos". En consecuencia, manifiestan propiedades que difieren con ...
TNT detection using a voltammetric electronic tongue based on neural networks

García Breijo, Eduardo; Olguín Pinatti, Cristian Ariel; Masot Peris, Rafael; Alcañiz Fillol, Miguel; Martínez Mañez, Ramón; Soto Camino, Juan (Elsevier, 2013-04-01)

We report here the use of a voltammetric electronic tongue based on simple metallic electrodes for the detection and discrimination of different concentrations of 2, 4, 6-trinitrotoluene (TNT) in acetonitrile: water 1:1 ...