Browsing by Author "De Rivas Martín, Beatriz"
Now showing items 1-20 of 27
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Behaviour of Rh supported on hydroxyapatite catalysts in partial oxidation and steam reforming of methane: On the role of the speciation of the Rh particles
Boukha, Zouhair; Choya Atencia, Andoni ; Gil Calvo, Myriam; De Rivas Martín, Beatriz; González Velasco, Juan Ramón; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2018-03-04)Rh/hydroxyapatite samples were prepared by impregnation and investigated for the partial oxidation (POM) and steam reforming (SRM) of methane. The catalysts were analysed by BET, XRD, DRS, XPS, H 2 -TPR, TEM, H2 chemisorption, ... -
Beneficial effects of nickel promoter on the efficiency of alumina-supported Co3O4 catalysts for lean methane oxidation
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2022-12)In this work bimetallic Ni catalysts supported over Co-Al2O3 and monometallic Co-Al2O3 and Ni-Al2O3 catalysts were examined for the complete oxidation of methane. With a 30 % total metallic loading, the samples were ... -
Bimetallic Ni-Co/Al2O3 Catalysts Derived from Aluminate Spinels for Dry Reforming of Methane
Choya Atencia, Andoni ; Ibañez Azpiroz, Julen; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (The Italian Association of Chemical Engineering (AIDIC), 2023-04-20)Five Ni-Co/Al2O3 catalysts for dry reforming of methane were obtained by high-temperature reduction of mixed Ni-Co spinel aluminates (NixCo1-xAl2O4) synthesised by a precipitation route. The aim of the study was to determine ... -
Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (MDPI, 2022-01-13)The synthesis of bulk pure Co3O4 catalysts by different routes has been examined in order to obtain highly active catalysts for lean methane combustion. Thus, eight synthesis methodologies, which were selected based on ... -
Catalytic Oxidation of Vinyl Chloride over SrCO3-Co3O4 Catalysts: Effect of the Sr:Co Molar Ratio
Gil Barbarin, Amaya; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén ; De Rivas Martín, Beatriz (The Italian Association of Chemical Engineering (AIDIC), 2023-05-30)Co3O4 catalysts modified with SrCO3 with various Sr:Co molar ratios were synthesized by a co-precipitation method and their catalytic behavior was examined for the gas-phase oxidation of vinyl chloride. The physicalchemical ... -
Catalytic removal of chlorinated compounds over ordered mesoporous cobalt oxides synthesised by hard-templating
González Prior, Jonatan; López Fonseca, Rubén ; Gutiérrez Ortiz, José Ignacio ; De Rivas Martín, Beatriz (Elsevier, 2017-09-28)This work evaluates the catalytic behaviour of a series of mesoporous bulk cobalt oxide prepared by hard-templating using SBA-15, SBA-16 and SBA-3. In addition, a bulk catalyst obtained by silica aquagel confined precipitation ... -
Co3O4 hollow nanotubes for the catalytic oxidation of C2-chlorinated VOCs
Gil Barbarin, Amaya; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén ; De Rivas Martín, Beatriz (Elsevier, 2023-04-07)Structured Co3O4 catalysts with a hollow nanotube morphology were prepared by several synthesis routes based on the Kirkendall effect. The resulting samples were kinetically evaluated in the gas-phase oxidation of vinyl ... -
Co3O4-based catalysts for methane emission control in natural gas engines: from bulk catalysts to open cell foam structured catalysts
La comercialización de vehículos impulsados con gas natural es una estrategia interesante parareducir las emisiones en el sector transporte. Sin embargo, su consolidación en el mercadoexige el control de las emisiones ... -
Comparative Study of Strategies for Enhancing the Performance of Co3O4/Al2O3 Catalysts for Lean Methane Combustion
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (MDPI, 2020-07-08)Spinel-type cobalt oxide is a highly active catalyst for oxidation reactions owing to its remarkable redox properties, although it generally exhibits poor mechanical, textural and structural properties. Supporting this ... -
Comparative Study of the Efficiency of Different Noble Metals Supported on Hydroxyapatite in the Catalytic Lean Methane Oxidation under Realistic Conditions
Boukha, Zouhair; De Rivas Martín, Beatriz; González Velasco, Juan Ramón; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (MDPI, 2021-06-28)The combustion of lean methane was studied over palladium, rhodium, platinum, and ruthenium catalysts supported on hydroxyapatite (HAP). The samples were prepared by wetness impregnation and thoroughly characterized by ... -
Desarrollo de catalizadores de Co3o4 nanocristalinos para la oxidación de compuestos clorados
Gabilondo Nieto, Maitane (2015-04-01)La contaminación atmosférica se presenta como uno de los problemas más importantes de las últimas décadas. Los efectos negativos de esta problemática son de carácter tanto global como local y ha n desencadenado una ... -
Design, characterization and evaluation of Ce-modified cobalt catalysts supported on alpha alumina in the abatement of methane emissions from natural gas engines.
Choya Atencia, Andoni ; Gudyka, Sylwia; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; Kotarba, Andrzej; López Fonseca, Rubén (Elsevier, 2021-03-22)This work deals with the optimisation of Ce-promoted Co3O4 catalysts supported on alpha alumina for the oxidation of traces amounts of methane. Ten Co-Ce samples were synthesised by incipient wetness coimpregnation with ... -
Dry reforming of methane over sub-stoichiometric NiAl2O4-mediated Ni/Al2O3 catalysts
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Nó Sánchez, María Luisa; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2023-10-31)A series of Ni/Al2O3 catalysts were prepared from substoichiometric NiAl2O4 precursors (Ni/Al molar ratio between 0.5 and 0.05) were examined for the dry reforming of methane. The calcined spinel precursors and the ... -
Effect of Residual Na+ on the Combustion of Methane over Co3O4 Bulk Catalysts Prepared by Precipitation
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (MDPI, 2018-09-29)The effect of the presence of residual sodium (0.4 %wt) over a Co3O4 bulk catalyst for methane combustion was studied. Two samples, with and without residual sodium, were synthesized by precipitation and thoroughly ... -
Hondakin plastikoen egungo egoera eta kudeaketa: polietilentereftalatoaren birziklapen aukerak
Duque Ingunza, Itxaso; López Fonseca, Rubén ; Ayastuy Arizti, José Luis ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio (Servicio Editorial de la Universidad del País Vasco/Euskal Herriko Unibertsitatearen Argitalpen Zerbitzua, 2013)Plastikoen erabilera oso hedatua dago eguneroko bizitzan, eta geroz eta material plastiko gehiago erabiltzen denez, hondakin kopuruak ere gora egin du azken urteotan. Izan ere, hondakinen kudeaketa beharrezko bilakatu dute ... -
Influence of the calcination temperature on the activity of hydroxyapatite-supported palladium catalyst in the methane oxidation reaction
Boukha, Zouhair; Choya Atencia, Andoni ; Cortés-Reyes, Marina; De Rivas Martín, Beatriz; Alemany, Luis J.; González Velasco, Juan Ramón; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2020-06-26)In the present study, a series of four hydroxyapatite (HAP) supported palladium samples, with a Pd loading close to 0.5 %, obtained through their calcination at 773, 873, 973, or 1073 K has been investigated. These samples ... -
Novel Ce-modified cobalt catalysts supported over α-Al2O3 open cell foams for lean methane oxidation
Choya Atencia, Andoni ; Gudyka, Sylwia; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; Kotarba, Andrzej; López Fonseca, Rubén (Elsevier, 2022-02)[EN] A series of CeO2-modified Co3O4 catalysts supported over alpha-Al2O3 foams was prepared by solution combustion synthesis and examined for the lean methane oxidation. Two different fuels were used namely, urea and ... -
On the beneficial effect of MgO promoter on the performance of Co3O4/Al2O3 catalysts for combustion of dilute methane
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; González Velasco, Juan Ramón; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2019-05-30)The present work deals with the analysis of a series of cobalt catalysts (20 and 30%wt.Co) supported on alumina modified with MgO (7–18%wt.Mg with respect to the support) for the combustion of dilute methane. Both modified ... -
On the Effect of the Synthesis Route of the Support in Co3O4/CeO2 Catalysts for the Complete Oxidation of Methane
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (ACS, 2022-12-06)Six ceria supports synthesized by various synthesis methodologies were used to deposit cobalt oxide. The catalysts were thoroughly characterized, and their catalytic activity for complete methane oxidation was studied. The ... -
Optimisation of bimetallic Co-Ni supported catalysts for oxidation of methane in natural gas vehicles
Choya Atencia, Andoni ; De Rivas Martín, Beatriz; González Velasco, Juan Ramón; Gutiérrez Ortiz, José Ignacio ; López Fonseca, Rubén (Elsevier, 2020-11-21)This work deals with the extensive study of supported bimetallic Co-Ni catalysts for the complete oxidation of methane. The simultaneous incorporation of nickel and cobalt was found to enhance the redox properties by ...