Listar por autoría "20e8d1a4-1567-4e65-8bc2-2ac4b6a49045"
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A simple, safe and robust system for hydrogenation "without high-pressure gases" under batch and flow conditions using a liquid organic hydrogen carrier
Porcar Garcia, Raul; Mollar Cuni, Andrés; Ventura Espinosa, David; Luis, Santiago V.; Garcia-Verdugo, Eduardo; Mata Martínez, Jose A Royal Society of Chemistry (2022)A simple, safe and robust system for the continuous, in situ and on demand generation of hydrogen under mild conditions is reported. A device formed by a packed bed reactor containing a ruthenium N-heterocyclic carbene ... -
Acceptorless dehydrogenation of primary alcohols using molecular complexes of ruthenium anchored onto reduced graphene oxide by non-covalent interactions
Ventura Espinosa, David Universitat Jaume I (2015-07-30) -
Catalytic activation of C-F bonds using NHC based complexes of ruthenium and palladium
Ventura Espinosa, David Universitat Jaume I (2014-07-24)The aim of the work is to establish the mechanism of the hydrodefluorination catalysed by the synergetic effects of the ruthenium and palladium. These objectives can be divided in the following items. 1. Synthesis and ... -
Catalytic Dehydrogenative Coupling of Hydrosilanes with Alcohols for the Production of Hydrogen On-demand: Application of a Silane/Alcohol Pair as a Liquid Organic Hydrogen Carrier
Ventura Espinosa, David; Carretero Cerdán, Alba; Baya, Miguel; García, Hermenegildo; Mata Martínez, Jose A Wiley (2017)The compound [Ru(p-cym)(Cl)2(NHC)] is an effective catalyst for the room-temperature coupling of silanes and alcohols with the concomitant formation of molecular hydrogen. High catalyst activity is observed for a variety ... -
Catalytic Hydrogen Production by Ruthenium Complexes from the Conversion of Primary Amines to Nitriles: Potential Application as a Liquid Organic Hydrogen Carrier
Ventura Espinosa, David; Marzá Beltrán, Aida; Mata Martínez, Jose A Wiley (2016)The potential application of the primary amine/nitrile pair as a liquid organic hydrogen carrier (LOHC) has been evaluated. Ruthenium complexes of formula [(p-cym)Ru(NHC)Cl2] (NHC=N-heterocyclic carbene) catalyze the ... -
Copper-mediated reduction of azides under seemingly oxidising conditions: catalytic and computational studies
Zelenay, Benjamin; Besora, Maria; Monasterio, Zaira; Ventura Espinosa, David; White, Andrew J. P.; Maseras, Feliu; Díez-González, Silvia Royal Society of Chemistry (2018)The reduction of aryl azides in the absence of an obvious reducing agent is reported. Careful catalyst design led to the production of anilines in the presence of water and air. The reaction medium (toluene/water) is crucial ... -
Enhancement of gold catalytic activity and stability by immobilization on the surface of graphene
Ventura Espinosa, David; Sabater López, Sara; Mata Martínez, Jose A Elsevier (2017-08)The catalytic performance of gold complexes is evaluated at the molecular level and when supported onto reduced graphene oxide (rGO). Gold complexes of general formula [(NHC)AuX] catalyse the synthesis of indoles via ... -
Gold nanoparticle-catalysed functionalization of carbon-hydrogen bonds by carbene transfer reactions
Martínez Laguna, Jonathan; Mollar Cuni, Andrés; Ventura Espinosa, David; Martín Solans, Santiago; Caballero Bevia, Ana; Mata Martínez, Jose A; Perez, Pedro J. The Royal Society of Chemistry (2022-02-23)Gold nanoparticles stabilized by NHC ligands and supported onto reduced graphene oxide (rGO) catalyse the functionalization of cyclohexane and benzene C–H bonds upon insertion of carbene CHCO2Et (from N2[double bond, length ... -
High Production of Hydrogen on Demand from Silanes Catalyzed by Iridium Complexes as a Versatile Hydrogen Storage System
Ventura Espinosa, David; Sabater, Sara; Carretero Cerdán, Alba; Baya, Miguel; Mata Martínez, Jose A American Chemical Society (2018)The catalytic dehydrogenative coupling of silanes and alcohols represents a convenient process to produce hydrogen on demand. The catalyst, an iridium complex of the formula [IrCp*(Cl)(2)(NHC)] containing an N-heterocyclic ... -
Improving Catalyst Activity in Hydrocarbon Functionalization by Remote Pyrene-Graphene Stacking
Ballestin, Pilar; Ventura Espinosa, David; Santiago Martín; Martín Solans, Santiago; Caballero, Ana; Mata Martínez, Jose A; Pérez, Pedro J. Wiley (2019)A copper complex bearing an N-heterocyclic carbene ligand with a pyrene "tail" attached to the backbone has been prepared and supported on reduced graphene oxide (rGO). The free and supported copper materials have been ... -
In situ decoration of graphene sheets with gold nanoparticles synthetized by pulsed laser ablation in liquids
Torres-Mendieta, Rafael; Ventura Espinosa, David; Sabater López, Sara; Lancis, Jesús; Mínguez-Vega, Gladys; Mata Martínez, Jose A (2016-07)The demand for nanocomposites of graphene and carbonaceous materials decorated with metallic nanoparticles is increasing on account of their applications in science and technology. Traditionally, the production of ... -
Influence of nanoparticle morphology and its dispersion ability regarding thermal properties of water used as phase change material
Barreneche, Camila; Mondragon, Rosa; Ventura Espinosa, David; Mata Martínez, Jose A; CABEZA, LUISA F.; Fernández, A. Inés; Juliá Bolívar, José Enrique (2018-01-05)Nanoparticles with different morphologies were added to water to study if the morphology of the nanoparticles affects the main parameters of water used as phase change material (PCM). Considered morphologies were spherical, ... -
Introducing Catalysis to Undergraduate Chemistry Students: Testing a Ru–NHC Complex in the Selective Dehydrogenative Coupling of Hydrosilanes and Alcohols
Mollar Cuni, Andrés; Mejuto, Carmen; Ventura Espinosa, David; Borja, María Pilar; Mata Martínez, Jose A American Chemical Society (2021-07-14)This work describes a complete laboratory experiment that involves the synthesis of a ruthenium complex [Ru(p-cym)(NHC)Cl2] (NHC = N-heterocyclic carbene) and its use as a catalyst for the coupling of hydrosilanes and ... -
Ligand effects in the stabilization of gold nanoparticles anchored on the surface of graphene: Implications in catalysis
Ventura Espinosa, David; Martín Solans, Santiago; García, Hermenegildo; Mata Martínez, Jose A Elsevier (2021-01-02)Gold nanoparticles (Au NPs) functionalized with N-heterocyclic carbene (NHC) ligands immobilized ontographene are obtained via spontaneous decomposition of well-defined gold-NHC complexes by reducedgraphene oxide (rGO) ... -
Multimetallic (de)hydrogenation catalysed processes
Ventura Espinosa, David; Mata Martínez, Jose A WILEY-VCH (2016)The use of different metals working together in a synergistic way, allows synthetic transformations that are not achievable by other means. The metal cooperation becomes important in catalytic processes for the synthesis ... -
Reduced Graphene Oxides as Carbocatalysts in Acceptorless Dehydrogenation of N-Heterocycles
Mollar Cuni, Andrés; Ventura Espinosa, David; Martín Solans, Santiago; Garcia, Hermenegildo; Mata Martínez, Jose A American Chemical Society (2021-11-22)The catalytic properties of graphene-derived materials are evaluated in acceptorless dehydrogenation of N-heterocycles. Among them, reduced graphene oxides (rGOs) are active (quantitative yields in 23 h) under mild conditions ... -
Ruthenium molecular complexes immobilized on graphene as active catalysts for the synthesis of carboxylic acids from alcohol dehydrogenation
Ventura Espinosa, David; Vicent Barrera, Cristian; Baya, Miguel; Mata Martínez, Jose A Royal Society of Chemistry (2016-09)Ruthenium complexes containing N-heterocyclic carbene ligands functionalized with different polyaromatic groups (pentafluorophenyl, anthracene, and pyrene) are immobilized onto the surface of reduced graphene oxide. The ... -
Stabilization of Nanoparticles Produced by Hydrogenation of Palladium–N-Heterocyclic Carbene Complexes on the Surface of Graphene and Implications in Catalysis
Mollar Cuni, Andrés; Ventura Espinosa, David; Martín Solans, Santiago; Mayoral, Álvaro; Borja, María Pilar; Mata Martínez, Jose A American Chemical Society (2018)Palladium nanoparticles (NPs) have been obtained by decomposition of well-defined palladium complexes noncovalently anchored onto the surface of reduced graphene oxide. Morphological analysis by microscopy showed the ... -
The non-innocent role of graphene in the formation/immobilization of ultra-small gold nanoparticles functionalized with N-heterocyclic carbene ligands
Ventura Espinosa, David; Martín Solans, Santiago; Mata Martínez, Jose A Elsevier (2019-07)Ultra-small gold nanoparticles (AuNPs) are obtained by treatment of well-defined gold complexes with reduced graphene oxide (rGO) without any auxiliary reducing agent. The AuNPs are functionalized with N-heterocyclic carbene ... -
Unraveling a Biomass-Derived Multiphase Catalyst for the Dehydrogenative Coupling of Silanes with Alcohols under Aerobic Conditions
Sorribes, Iván; Ventura Espinosa, David; Assis, Marcelo de; Martín, Santiago; Concepcion, Patricia; Longo, Elson; Mata Martínez, Jose A; Andres, Juan American Chemical Society (2021)Herein, a novel silver and chromium nanostructured N-doped carbonaceous material has been synthesized by a biomass-annealing approach using readily available chitosan as a raw material. The resulting catalyst AgCr@CN-800 ...