Exploració per tema "Catalysis"

Ara es mostren els items 21-40 de 104

    • Catalytic performance of zinc-supported copper and nickel catalysts in the glycerol hydrogenolysis 

      Chimentäo, Ricardo José; Miranda Morales, Bárbara C.; Gispert Guirado, Francesc; Medina Cabello, Francisco; Llorca Piqué, Jordi; Santos, João Batista O. (2020-03-01)
      Article
      Accés obert
      Gas-phase catalytic conversion of glycerol to value added chemicals was investigated over zinc-supported copper and nickel catalysts. The addition of aluminum in the support was also investigated in glycerol conversion and ...

    • Catalytic reforming of dimethyl ether in microchannels 

      Ledesma Rodriguez, Cristian; López, Eduardo; Trifonov, T.; Rodríguez Martínez, Ángel; Llorca Piqué, Jordi (2018-03-09)
      Article
      Accés obert
      The steam reforming and oxidative steam reforming of dimethyl ether (DME) were tested at 573–773¿K over a CuZn/ZrO2 catalyst in microreactors with three different types of channels: ceramic square channels with side lengths ...

    • Catalytic steam reforming of olive mill wastewater for hydrogen production 

      Casanovas, A.; Galvis, A; Llorca Piqué, Jordi (2015-06-29)
      Article
      Accés obert
      Catalytic honeycombs functionalized with lanthanum-stabilized ceria as catalytic support and impregnated with different metals (Rh, Ru, Pt, Pd and Ni) were prepared and tested for hydrogen production through the steam ...

    • Catalytic transformation of biomass-derived 5-hydroxymethylfurfural over supported bimetallic iridium-based catalysts 

      Chimentäo, Ricardo José; Oliva Muñoz, Héctor; Russo, Verdiana; Llorca Piqué, Jordi; Garcia Fierro, Jose-Luis (American Chemical Society (ACS), 2021-04-28)
      Article
      Accés obert
      5-Hydroxymethylfurfural (HMF) is a biobased platform chemical that can be valorized into a spectrum of valuable products. In this report, supported Ir, Ir–Co, Ir–Ni, and Ir–Ru catalysts were investigated for this purpose. ...

    • Ceria-based catalysts studied by near ambient pressure x-ray photoelectron spectroscopy: A review 

      García de Andrés, Xènia; Soler Turu, Lluís; Jiménez Divins, Nuria; Vendrell Villafruela, Xavier; Serrano Carreño, M. Isabel; Lucentini, Ilaria; Prat Albert, Jordi; Solano Minuesa, Eduardo; Tallarida, Massimo; Escudero, Carlos; Llorca Piqué, Jordi (2020-03-03)
      Article
      Accés obert
      The development of better catalysts is a passionate topic at the forefront of modern science, where operando techniques are necessary to identify the nature of the active sites. The surface of a solid catalyst is dynamic ...

    • Ceria-zirconia particles wrapped in a 2D carbon envelope: improved low-temperature oxygen transfer and oxidation activity 

      Aneggi, Eleonora; Rico Perez, Veronica; de Leitenburg, Carla; Maschio, Stefano; Soler Turu, Lluís; Llorca Piqué, Jordi; Trovarelli, Alessandro (2015-10-08)
      Article
      Accés obert
      Engineering the interface between different compo-nents of heterogeneous catalysts at nanometer level canradically alter their performances.This is particularly true forceria-based catalysts where the interactions are ...

    • Characterization of 3D-printed ¿-Al2O3 used for Catalytic Applications 

      Quirós Gazel, Felipe (Universitat Politècnica de Catalunya, 2021-07)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      In recent years, additive manufacturing (AM) techniques have made significant progress by increasing printing quality, the variety of printable materials, and 3D printer accessibility. In this sense, ceramic materials play ...

    • Chemically powered micro- and nanomotors 

      Sanchez, Samuel; Soler Turu, Lluís; Katuri, Jaideep (2015-01-26)
      Article
      Accés restringit per política de l'editorial
      Chemically powered micro- and nanomotors are small devices that are self-propelled by catalytic reactions in fluids. Taking inspiration from biomotors, scientists are aiming to find the best architecture for self-propulsion, ...

    • CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides 

      Italiano, Cristina; Llorca Piqué, Jordi; Pino, Lidia; Ferraro, Marco; Antonucci, Vincenzo; Vita, Antonio (2020-05-05)
      Article
      Accés obert
      Methanation of carbon oxides (CO and CO2) was studied over Ni-based catalysts supported on CeO2, Al2O3, and Y2O3 oxides. Catalysts were synthesized by solution combustion synthesis and characterized by N2-physisorption, ...

    • Development of microscale-based electrochemical reactor between two parallel plates coated with catalyst to produce green hydrogen peroxide 

      Esquerdo Fossas, Martí (Universitat Politècnica de Catalunya, 2020-06-29)
      Treball Final de Grau
      Accés obert
      Hydrogen peroxide is an important chemical that is in great demand in many sectors in today's world. Currently the process used to obtain hydrogen peroxide is the anthraquinone autoxidation process. Due to the complexity ...

    • Development of microstructured zeolite films as highly accessible catalytic coatings for microreactors 

      Urbiztondo Castro, Miguel Ángel; Valera Cano, Enrique Andrés; Todorov Trifonov, Trifon; Alcubilla González, Ramón; Irusta Alderete, Silvia; Pina Iritia, María Pilar; Rodríguez Martínez, Ángel; Santamaria Ramiro, Jesus (2007-08-15)
      Article
      Accés restringit per política de l'editorial
      Regular structures of SiO2 microneedles and Si micromonoliths have been formed using processing methods similar to those used in the microelectronics field; then these structures have been used as supports for zeolite ...

    • Direct ink-writing of Ni/y-Al2O3 for catalytic applications 

      Koch, Gauthier (Universitat Politècnica de Catalunya, 2022-02-11)
      Projecte Final de Màster Oficial
      Accés restringit per decisió de l'autor
      Com que els mètodes de fabricació additiva (AM) s'han desenvolupat de manera significativa, s'han estudiat molts materials i l'ús d'aquesta tecnologia en els últims anys. Els materials ceràmics presenten un interès real ...

    • Dual-cured thermosets based on eugenol derivatives and thiol chemistry 

      Roig Gibert, Adriá; Ramis Juan, Xavier; De la Flor López, Silvia; Serra Albet, Maria Àngels (Elsevier, 2023-11-22)
      Article
      Accés restringit per política de l'editorial
      This paper aims to increase sustainability in thermosetting polymeric fields using bio-based monomers and environmentally friendly processing technologies based on dual-curing. Eugenol has been transformed into acrylate ...

    • Dynamic behaviour of platinum and copper dopants in gold nanoclusters supported on ceria catalysts 

      Müller, Nicole; Banu, Rares; Loxha, Adea; Schrenk, Florian; Lindenthal, Lorenz; Rameshan, Christoph; Pittenauer, Ernst; Llorca Piqué, Jordi; Timoshenko, Janis; Marini, Carlo; Barrabés Rabanal, Noelia (Springer Nature, 2023-12-18)
      Article
      Accés obert
      Understanding the behaviour of active catalyst sites at the atomic level is crucial for optimizing catalytic performance. Here, the evolution of Pt and Cu dopants in Au25 clusters on CeO2 supports is investigated in the ...

    • Dynamic reorganization of bimetallic nanoparticles under reaction depending on the support nanoshape: the case of RhPd over ceria nanocubes and nanorods under ethanol steam reforming 

      Soler Turu, Lluís; Casanovas Grau, Albert; Ryan, James; Angurell Purroy, Inmaculada; Escudero, Carlos; Pérez Dieste, Virginia; Llorca Piqué, Jordi (2019-04-05)
      Article
      Accés restringit per política de l'editorial
      Bimetallic catalysts exhibit high performance compared to that of their monometallic counterparts in a wide range of catalytic reactions. Both geometric and electronic phenomena yield unique properties that cannot be ...

    • Dynamic simulation of pure hydrogen production via ethanol steam reforming in a catalytic membrane reactor 

      Hedayati, Ali; Le Corre, Oliver; Lacarriere, Bruno; Llorca Piqué, Jordi (2016-12-15)
      Article
      Accés obert
      Ethanol steam reforming (ESR) was performed over Pd-Rh/CeO2 catalyst in a catalytic membrane reactor (CMR) as a reformer unit for production of fuel cell grade pure hydrogen. Experiments were performed at 923 K, 6–10 bar, ...

    • Effect of the formation of NiCu alloy and use of biomass-derived furfural on the catalytic hydrogenation of furfural to THFA 

      Sánchez, Vladimir; Salagre, Pilar; González, Maria Dolores; Llorca Piqué, Jordi; Cesteros, Yolanda (2020-07-01)
      Article
      Accés obert
      Several Ni, Cu and Ni-Cu catalysts supported on mesoporous hectorite were prepared, characterized and tested for the hydrogenation of commercial furfural to obtain tetrahydrofurfuryl alcohol (THFA). The highest selectivity ...

    • Electrochemical sensors based on electrochemically inert polymers 

      Buendía Morales, Jordi Juan (Universitat Politècnica de Catalunya, 2016-06-28)
      Treball Final de Grau
      Accés obert
      The functionalization of electrochemical sensors by plasma techniques represents a new approach to surface physics for nanotechnology implementation and should give a new access to long standing open problems such as the ...

    • Energy from hydrogen. Hydrogen from renewable fuels for portable applications 

      Llorca Piqué, Jordi (2011-11-01)
      Article
      Accés restringit per política de l'editorial
      Molecular hydrogen is an environmentally clean source of energy, but it is not available on Earth. Steam reforming of bio-derived compounds represents a valuable route for the generation of molecular hydrogen and has the ...

    • Estudi dels catalitzadors Ni/Al2O3 i Ru/Al2O3 per la reacció de metanització de CO2 

      Torrent Ginesta, Gemma (Universitat Politècnica de Catalunya, 2022-07-07)
      Treball Final de Grau
      Accés obert
      Avui en dia, el control d’emissions de CO2 s’ha convertit en un objecte d’estudi de moltes línies d’investigació, per l’impacte que aquest gas ha causat al planeta durant les últimes dècades. La tecnologia Power-To-Gas és ...