Browsing by Subject "Oxidation"

Now showing items 21-40 of 60

    • Evolution of pyrrhotite oxidation in aggregates for concrete 

      Oliveira da Silva, Izelman; Pialarissi Cavalaro, Sergio Henrique; Aguado de Cea, Antonio (2014-11-17)
      Article
      Open Access
      Rocks containing pyrrhotite bands are sometimes used to produce concrete. These rocks oxidize and produce long-term expansive reactions that damage concrete structures, leading to important economic and risk related ...

    • Heterogeneous Fenton-like oxidation of p-hydroxybenzoic acid using Fe/CeO2-TiO2 catalyst 

      Hammedi, Tijani; Triki, Mohamed; Alvarez, Mayra G; Llorca Piqué, Jordi; Ghorbel, Abdelhamid; Ksibi, Zouhaier; Medina Mena, Francisco (2019-04-01)
      Article
      Open Access
      This paper is built on the Fenton-like oxidation of p-hydroxybenzoic acid (p–HBZ) in the presence of H2O2 and 3%Fe supported on CeO2-TiO2 aerogels under mild conditions. These catalysts were deeply characterized by X-ray ...

    • High temperature cyclic oxidation behavior of low manganese Fe12Mn9Cr5Si4Ni-NbC shape memory stainless steels 

      de Sousa Malafaia, Artur Mariano; della Rovere, Carlos Alberto; Baldan, Renato; Suárez Fernández, Lucía; Cabrera Marrero, José M.; Falcão de Oliveira, Marcelo (2021-03-15)
      Article
      Restricted access - publisher's policy
      High amounts of Mn in Fe-Mn-Si-Cr-Ni shape memory stainless steels are detrimental for oxidation resistance at high temperatures. However, in order to maintain the shape memory effect of these alloys the content of manganese ...

    • Improving photo-Fenton process by hydrogen peroxide dosage strategies. Dissolved oxygen performance indicator 

      Yu, Xiangwei; Graells Sobré, Moisès; Miralles Cuevas, Sara; Cabrera Reina, Alejandro; Pérez Moya, Montserrat (2020)
      Conference report
      Open Access
      Fenton and photo-Fenton are Advanced Oxidation processes driven by the supply of hydrogen peroxide (H2O2). However, excessive hydrogen peroxide supply results in unproductive reactions and causes the process performance ...

    • Improving selective thermal emission properties of three-dimensional macroporous silicon through porosity tuning 

      Garin Escriva, Moises; Todorov Trifonov, Trifon; Rodríguez Martínez, Ángel; Alcubilla González, Ramón; Marquier, F.; Arnold, C.; Greffet, J.-J. (American Institute of Physics, 2008-08-27)
      Article
      Restricted access - publisher's policy
      We present a theoretical and experimental study on the effect of progressive porosity increase, through multiple oxidation/oxide removal steps, upon the optical characteristics in threedimensional macroporous silicon. ...

    • Improving the Oxidative Stability of a High Redox Potential Fungal Peroxidase by Rational Design 

      Sáez-Jiménez, Veronica; Acebes, Sandra; Guallar, Víctor; Martínez, Angel T.; Ruiz-Dueñas, Francisco Javier (PLoS, 2015-04-29)
      Article
      Open Access
      Ligninolytic peroxidases are enzymes of biotechnological interest due to their ability to oxidize high redox potential aromatic compounds, including the recalcitrant lignin polymer. However, different obstacles prevent ...

    • In situ environmental HRTEM discloses low temperature carbon soot oxidation by ceria-zirconia at the nanoscale 

      Aneggi, Eleonora; Llorca Piqué, Jordi; Trovarelli, Alessandro; Aouine, Mimoun; Vernoux, Philippe (2019-04-07)
      Article
      Open Access
      The very close contact between ceria–zirconia and carbon soot allows the detection of oxygen transfer from ceria–zirconia to carbon by in situ Environmental HRTEM already at low temperatures. This highlights the outstanding ...

    • Increased conductivity of a hole transport layer due to oxidation by a molecular nanomagnet 

      Cheylan, Stephanie; Puigdollers i González, Joaquim; Bolink, Henk J.; Coronado Miralles, Eugenio; Voz Sánchez, Cristóbal; Alcubilla González, Ramón; Badenes Guia, Gonçal (American Institute of Physics, 2008-05-14)
      Article
      Restricted access - publisher's policy
      Thin film transistors based on polyarylamine poly?N,N?-diphenyl-N,N ?bis?4-hexylphenyl?- ?1,1?biphenyl?-4,4?-diamine ?pTPD? were fabricated using spin coating in order to measure the mobility of pTPD upon oxidation. ...

    • Increased conductivity of a hole transport layer due to oxidation by a molecular nanomagnet - art. no. 096110 

      Cheylan, Stephanie; Puigdollers i González, Joaquim; Bolink, H J; Coronado, E; Voz Sánchez, Cristóbal; Alcubilla González, Ramón; Badenes, G (American Institute of Physics (AIP), 2008-05)
      Article
      Restricted access - publisher's policy
      Thin film transistors based on polyarylamine poly(N,N'-diphenyl-N,N'bis(4-hexylphenyl)-[1,1'biphenyl]-4,4'-diamine (pTPD) were fabricated using spin coating in order to measure the mobility of pTPD upon oxidation. Partially ...

    • Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al- 2Sn-4Zr-2Mo alloy 

      Fargas Ribas, Gemma; Roa Rovira, Joan Josep; Sefer, B.; Mateo García, Antonio Manuel (2018-11-01)
      Article
      Restricted access - publisher's policy
      Ti-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in ...

    • Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al-2Sn-4Zr-2Mo alloy 

      Fargas Ribas, Gemma; Roa Rovira, Joan Josep; Sefer, Birhan; Mateo García, Antonio Manuel (2018-11-01)
      Article
      Restricted access - publisher's policy
      Ti-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in ...

    • Investigation on the influence of char properties on its oxidation reactivity under different atmospheres 

      Anadón Martínez, Verónica (Universitat Politècnica de Catalunya, 2018-10-05)
      Bachelor thesis
      Open Access
      Covenantee:   Technische Universität Berlin
      The objective of this thesis is the study of the influence of char properties on its reactivity of oxidation and gasification under different atmospheres, including air, carbon dioxide and water vapor. To modify the ...

    • Ligand and support effects on the reactivity and stability of Au38(SR)24 catalysts in oxidation reactions 

      Zhang, Bei; García Yago, Clara; Sels, A.; Salassa, Giovanni; Rameshan, Christoph; Llorca Piqué, Jordi; Hradil, Klaudia; Rupprechter, Guenther; Barrabés, N.; Bürgi, T. (2019-10-01)
      Article
      Open Access
      Thiolate protected metal nanoclusters are emerging materials for the preparation of atomically defined heterogeneous catalysts. Recently it was revealed that the ligands migrated to the support upon cluster deposition, ...

    • Macroporous silicon microreactor for the preferential oxidation of CO 

      Divins, N.J.; López, E.; Llorca, J.; Vega, Didac; Rodríguez Martínez, Ángel; González de Rivera, F.; Angurell, I.; Seco, M.; Rossell, O. (Institute of Electrical and Electronics Engineers (IEEE), 2013)
      Conference report
      Restricted access - publisher's policy
      A macroporous silicon micromonolith containing ca. 40,000 regular channels of 3.3 μm in diameter per square millimeter has been successfully functionalized with an Au/TiO2 catalyst for CO preferential oxidation (CO-PrOx) ...

    • Magnetite-supported palladium single-atoms do not catalyse the hydrogenation of alkenes but small clusters do 

      Rosell, Marta D.; Caparrós, Francisco J.; Angurell Purroy, Inmaculada; Müller Jevenois, Guillermo; Llorca Piqué, Jordi; Seco García, Miquel Angel; Rosell, Oriol (2016-01-01)
      Article
      Open Access
      The activity of supported noble metal catalysts strongly depends on the particle size. The ultimate small-size limit is the single-atom catalyst (SAC), which maximizes the catalytic efficiency in the majority of the examples. ...

    • Methane oxidation activity and nanoscale characterization of Pd/CeO2 catalysts prepared by dry milling Pd acetate and ceria 

      Danielis, Maila; Orozco, Ivan; Jiménez Divins, Nuria; Llorca Piqué, Jordi; Rodriguez, Jose A.; Senanayake, Sanjaya D.; Colussi, Sara; Trovarelli, Alessandro (2021-03-01)
      Article
      Restricted access - publisher's policy
      The milling of Palladium acetate and CeO2 under dry conditions results in robust, environmentally friendly catalysts with excellent methane oxidation activity. These catalysts show superior performance compared to those ...

    • Mineralization of hetero bi-functional reactive dye in aqueous solution by Fenton and photo-Fenton reactions 

      Torrades Carné, Francesc; García Hortal, José Antonio; García Montaño, Julia (2015-08-18)
      Article
      Open Access
      This study focused on the advanced oxidation of the hetero bi-functional reactive dye Sumifix Supra Yellow 3RF (CI Reactive Yellow 145) using dark Fenton and photo-Fenton conditions in a lab-scale experiment. A 2(3) factorial ...

    • Modeling and simulation of complex nonlinear dynamic processes using data based models: application to photo-fenton process 

      Shokry Abdelaleem Taha Zied, Ahmed; Audino, Francesca; Vicente Núñez, Patricia; Escudero Bakx, Gerard; Pérez Moya, Montserrat; Graells Sobré, Moisès; Espuña Camarasa, Antonio (Elsevier, 2015)
      Conference report
      Restricted access - publisher's policy
      This paper investigates data based modelling of complex nonlinear processes, for which a first principle model useful for process monitoring and control is not available. These empirical models may be used as soft sensors ...

    • Modellization of a microreactor for the catalytic partial oxidation of methane 

      Hakizimana, Pierre (Universitat Politècnica de Catalunya, 2019-01-30)
      Bachelor thesis
      Open Access
      Covenantee:   Université de Lorraine
      Conversion of methane and carbon dioxide, which are two of the cheapest and most abundant carbon-containing materials, into useful products is an important area of current catalytic research. This reaction has also very ...

    • Oxidation behavior of maraging 300 alloy exposed to nitrogen/water vapor atmosphere at 500 °C 

      Cerra Flórez, Mauro Andrés; Fargas Ribas, Gemma; Mateo García, Antonio Manuel; Roa Rovira, Joan Josep (Multidisciplinary Digital Publishing Institute (MDPI), 2021-06-24)
      Article
      Open Access
      Aging heat treatments in maraging steels are fundamental to achieve the excellent mechanical properties required in several industries, i.e., nuclear, automotive, etc. In this research, samples of maraging 300 alloy were ...