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Browsing by Subject "Oxidation"

Now showing items 21-40 of 53

Estabilidad de bases aromáticas alimentarias microencapsuladas: Comparación de diferentes combinaciones de soportes basados en hidratos de carbono, proteinas y gomas.

Navarro Selma, Ignacio (2015-11-13)

[ES] Uno de los factores clave en la calidad de los productos elaborados por las empresas del sector de la alimentación es la preservación de los aromas propios del alimento. En este trabajo se han estudiado los efectos ...
Estudio del efecto del fuego en los cambios microestructurales de las aleaciones del cobre

López Sánchez, Inmaculada (2012-01-17)

Estudio de las transformaciones que los conductores de cobre sufren en distintas condiciones de trabajo, para lo cual hemos sometido a distintos conductores de 2.5, 4, 6 y 13 mm2 a temperaturas de 950, 975, 1000, 1050 y ...
Ethylene Production by ODHE in Catalytic Modified Ba0.5Sr0.5Co0.8Fe0.2O3 Membrane Reactors

Lobera González, Maria Pilar; Escolástico Rozalén, Sonia; García Fayos, Julio; Serra Alfaro, José Manuel (Wiley-VCH Verlag, 2012)

[EN] Process intensification by the integration of membranes and high-temperature reactors offers several advantages with regard to conventional process schemes, that is, energy saving, safe operation, reduced plant/unit ...
Evaluación de la oxidación superficial de recubrimientos de Ti6Al4V obtenidos por recubrimiento por láser

Amigó Borrás, Vicente; Candel Bou, Juan José; Amado, J.M.; Yañez, A. (CSIC, 2010)

[ES] Se ha estudiado la in¿uencia de los parámetros de procesado sobre la oxidación super¿cial y propiedades mecánicas de diferentes recubrimientos de Ti6Al4V. La gran reactividad química del polvo de titanio junto a la ...
Evaluation of two ion-exchange membranes for the transport of tin in the presence of hydrochloric acid

García Gabaldón, Montserrat; Pérez-Herranz, Valentín; Ortega Navarro, Emma María (Elsevier, 2011-01-19)

The transport properties of two ion-exchange membranes in the presence of tin, as Sn(II) and Sn(IV), were investigated by chronopotentiometry and current-voltage curves. Since tin forms positively or negatively charged ...
Exceptional oxidation activity with size-controlled supported gold clusters of low atomicity

Corma Canós, Avelino; Concepción Heydorn, Patricia; Boronat Zaragoza, Mercedes; Sabater Picot, Mª José; Navas Escrig, Javier; Yacaman, Miguel José; Larios, Eduardo; Posadas, Álvaro; López Quintela, M. Arturo; Buceta, David; Mendoza, Ernest; Guilera, Gemma; Mayoral, Álvaro (Nature Publishing Group, 2013-09)

[EN] The catalytic activity of gold depends on particle size, with the reactivity increasing as the particle diameter decreases. However, investigations into behaviour in the subnanometre regime (where gold exists as small ...
Gold Catalysis Opens Up a New Route for the Synthesis of Benzimidazoylquinoxaline Derivatives from Biomass Derived Products (Glycerol)

Climent Olmedo, María José; Corma Canós, Avelino; Iborra Chornet, Sara; Martínez Silvestre, Sergio (Wiley-VCH Verlag, 2013-12)

Process intensification by using well-defined solid catalysts able to perform one-pot multistep reactions is one of the open fronts in heterogeneous catalysis. This is even more relevant if new, more efficient synthesis ...
High temperature oxidation behavior of laser cladding MCrAlY coatings on austenitic stainless steel

Pereira, Juan Carlos; Zambrano, J.C.; Tobar, M.J.; Yañez, A.; Amigó Borrás, Vicente (Elsevier, 2015-05-25)

The development of coatings has become technologically significant in many industries. A common approach in high temperature applications is the production of new thermal barrier coatings (TBCs). Laser cladding (LC) can ...
Hydroxyl radical as an unlikely key intermediate in the photodegradation of emerging pollutants

Rodríguez Muñiz, Gemma María; Gomis Vicens, Juan; Arques Sanz, Antonio; Amat Payá, Ana María; Marín García, Mª Luisa; Miranda Alonso, Miguel Ángel (Wiley-Blackwell, 2014-11)

In this work, a kinetic model, in combination with time-resolved experiments, is applied to assess the involvement of OH in the photodegradation of emerging pollutants (EPs) by means of advanced oxidation processes. In ...
Influence of process parameters and initial microstructure on the oxidation resistance of Ti48Al2Cr2Nb coating obtained by laser metal deposition

Zambrano Carrullo, Jenny Cecilia; Pereira Falcón, Juan Carlos; Amigó, Vicente (Elsevier, 2019)

[EN] Ti6Al4V have been the most important and versatile titanium alloys currently used, due to their excellent combination of low density and good mechanical properties, despite their application temperature being limited ...
Intracrystalline diffusion in metal organic framework during heterogeneous catalisys: Influence of particle size on the activity of MIL-100 (Fe) for oxidation reaction

Dhakshinamoorthy, Amarajothi; Alvaro Rodríguez, Maria Mercedes; Hwang, Young Kyu; Seo, You-Kyong; Corma Canós, Avelino; García Gómez, Hermenegildo (ROYAL SOC CHEMISTRY, 2011)

[EN] Three MIL-100 (Fe) samples differing in average crystal size (from 60-70 to >400 nm) have been synthesized by microwave heating using three HF/Fe 3+ ratios. Oxidation of diphenylmethane with tert-butylhydroperoxide ...
La Cruz de Cerrajería (Sevilla): historia, proceso degradativo, materiales y metodología de restauración

Alejandre Sánchez, Francisco J.; Flores-Alés, Vicente; Soler Núñez, Pilar; León Calzado, José (Universitat Politècnica de València, 2018-12-19)

[EN] The Cruz de Cerrajería is a wrought-iron cross forged in 1692 by the master locksmith Sebastián Conde. Its exposure to environmental elements, its structural characteristics and the inappropriate application of ...
Monitoring pH and ORP in a SHARON reactor

Claros Bedoya, Javier Alfonso; Serralta Sevilla, Joaquín; Seco Torrecillas, Aurora; Ferrer Polo, José; Aguado García, Daniel (IWA Publishing, 2011)

This paper analyses the valuable information provided by the on-line measurements of pH and oxidation reduction potential (ORP) in a continuous single high ammonia removal over nitrite (SHARON) reactor. A laboratory-scale ...
Nanosized vanadium, tungsten and molybdenum oxide clusters grown in porous chitosan microspheres as promising hybrid materials for selective alcohol oxidation

El Kadib, Abdelkrim; Primo Arnau, Ana María; Molvinger, Karine; Bousmina, Mosto; Brunel, Daniel (Wiley-VCH Verlag, 2011-07-04)

The ability of chitosan biopolymer to coordinate vanadium, tungsten and molybdenum metallic species and to control their mineralisation growth provides a new family of surface-reactive organic-inorganic hybrid microspheres. ...
Native vs photoinduced chemiluminescence in dimethoate determination

Catalá Icardo, Mónica; López Paz, José Luis; Choves Barón, Cristina; Pena Badena, A. (ELSEVIER SCIENCE BV, 2012)

The determination of dimethoate using either its native chemiluminescent (CL) properties or its photoinduced chemiluminescence obtained by irradiation with a 15W low-pressure mercury lamp was studied. Thereby, two flow ...
New high-pressure phase and equation of state of Ce2Zr2O8

Errandonea, Daniel; Kumar, R.S.; Achary, S.N.; Gomis Hilario, Oscar; Manjón Herrera, Francisco Javier; Shukla, R.; Tyagi, A.K. (American Institute of Physics (AIP), 2012-03-08)

In this paper we report a new high-pressure rhombohedral phase of Ce2Zr2O8 observed in high-pressure angle-dispersive x-ray diffraction and Raman spectroscopy studies up to nearly 12 GPa. The ambient-pressure cubic phase ...
New laboratory procedure using a modal approach to obtain vibration attenuation properties of unaged and aged asphalt mixtures

Real Herraiz, Teresa Pilar; Montalbán Domingo, María Laura; Masanet Sendra, Claudio; Real Herráiz, Julia Irene (SAGE Publications, 2016-04)

[EN] During asphalt mixture service life, its structural and physical capabilities deteriorate progressively. A modal analysis using impact hammer excitation technique is put forward to measure the damping factor instead ...
Nmr relaxation reveals modifications in rubber phase dynamics during long-term degradation of high-impact polystyrene (HIPS)

Vilaplana, Francisco; Karlsson, Sigbritt; Ribes-Greus, A.; Schade, Christian; Nestle, Nikolaus (ELSEVIER SCI LTD, 2011)

[EN] The microstructure of rubber-modified polystyrene after thermal ageing at 90 °C and multiple extrusion was analyzed by time-domain nuclear magnetic resonance (TD-NMR) in a non-destructive manner. The transverse ...
Nuevas formulaciones de materiales de relleno multicomponentes empleados en intervención de escultura contemporánea de exterior

Vivancos Ramón, María Victoria; Martín Rey, Susana; Simón Cortés, José Manuel; Robles de la Cruz, Cristina (Instituto Andaluz del Patrimonio Histórico, 2015-06)

[EN] One of the main problems against the metal outdoor sculptures conservatives is the treatment of damages caused by the oxidation of the materials that compose them. The environmental setting that circle the piece play ...
One pot synthesis of cyclohexanone oxime from nitrobenzene using a bifunctional catalyst

Rubio Marqués, Paula; Hernández Garrido, Juan Carlos; Leyva Perez, Antonio; Corma Canós, Avelino (Royal Society of Chemistry, 2014)

Cyclohexanone oxime is formed from nitrobenzene with 97% yield in a one-pot reaction catalysed by palladium and gold nanoparticles on carbon. The reaction is carried out under hydrogen at 60 8C and the overall transformation ...