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Listar por autor "Wittee Lopes, Christian"

Mostrando ítems 1-17 de 17

A Lamellar MWW Zeolite With Silicon and Niobium Oxide Pillars: A Catalyst for the Oxidation of Volatile Organic Compounds

Schwanke, Anderson Joel; Balzer, Rosana; Lopes, Christian Wittee; Meira, Debora Motta; DÍAZ MORALES, URBANO MANUEL; Corma Canós, Avelino; Pergher, Sibele (John Wiley & Sons, 2020-08-17)

[EN] In this work, an MWW-type zeolite with pillars containing silicon and niobium oxide was synthesized to obtain a hierarchical zeolite. The effect of niobium insertion in the pillaring process was determined by combining ...
AgAu nanoclusters supported on zeolites: Structural dynamics during CO oxidation

López-Hernández, I.; Truttmann, V.; Garcia, C.; W. Lopes, C.; Rameshan, C.; Stöger-Pollach, M.; Barrabés, N.; Rupprechter, G.; Rey Garcia, Fernando; Palomares Gimeno, Antonio Eduardo (Elsevier, 2022-02-15)

[EN] The bimetallic nanocluster catalyst structure can change during pretreatment and reaction, thus in situ characterization techniques are required for a proper analysis of the active sites. In situ XAFS and DRIFTS were ...
AgY zeolite as catalyst for the selective catalytic oxidation of NH3

Martinez-Ortigosa, Joaquin; Lopes, Christian W.; Agostini, Giovanni; Palomares Gimeno, Antonio Eduardo; Blasco Lanzuela, Teresa; Rey Garcia, Fernando (Elsevier, 2021-08)

[EN] Ag-exchanged Y zeolites (Si/Al = 2.5; Ag/Al = 0.30-0.95) have been tested in the NH3-SCO reaction, the most promising method for the elimination of ammonia emissions, and deeply characterized before and after reaction ...
An in situ XAS study of the activation of precursor-dependent Pd nanoparticles

Wittee Lopes, Christian; Cerrillo, José Luis; Palomares Gimeno, Antonio Eduardo; Rey Garcia, Fernando; Agostini, G. (The Royal Society of Chemistry, 2018-05-14)

[EN] The activation of precursor-dependent Pd nanoparticles was comprehensively followed by in situ X-ray absorption spectroscopy on two inorganic supports for rationalizing the final catalytic activity. Two series of ...
Atomic-level understanding on the evolution behavior of subnanometric Pt and Sn species during high-temperature treatments for generation of dense PtSn clusters in zeolites

Liu, Lichen; Lopez-Haro, Miguel; Wittee Lopes, Christian; MEIRA, DEBORA M.; Concepción Heydorn, Patricia; Calvino, José J.; Corma Canós, Avelino (Elsevier, 2020-11)

[EN] To achieve high-loading of stable subnanometric metal clusters on solid carriers is a challenge since those small metal clusters have strong tendency to sinter into larger nanoparticles. Development of facile synthesis ...
Characterization of metallic species on porous materials by in situ XAS

Wittee Lopes, Christian (Universitat Politècnica de València, 2018-09-10)

El objetivo de esta tesis es estudiar la agrupación y el crecimiento de especies metálicas confinadas o soportadas en materiales porosos mediante espectroscopia de absorción de rayos X in situ. Para lograrlo, las especies ...
Cobalt nanoclusters coated with N-doped carbon for chemoselective nitroarene hydrogenation and tandem reactions in water

Gutiérrez-Tarriño, Silvia; Rojas-Buzo, Sergio; Lopes, Christian W.; Agostini, Giovanni; Calvino, José J.; Corma Canós, Avelino; Oña-Burgos, Pascual (The Royal Society of Chemistry, 2021-06-21)

[EN] The development of active and selective non-noble metal-based catalysts for the chemoselective reduction of nitro compounds in aquo media under mild conditions is an attractive research area. Herein, the synthesis of ...
Confined Pt-1(1+) Water Clusters in a MOF Catalyze the Low-Temperature Water-Gas Shift Reaction with both CO2 Oxygen Atoms Coming from Water

Rivero-Crespo, Miguel Ángel; Mon, Marta; Ferrando-Soria, Jesus; Lopes, Christian W.; Boronat Zaragoza, Mercedes; Leyva Perez, Antonio; Corma Canós, Avelino; Hernandez-Garrido, Juan carlos; López-Haro, Miguel; Calvino, Jose J.; Ramos-Fernandez, Enrique V.; Armentano, Donatella; Pardo, Emilio (John Wiley & Sons, 2018-12-21)

[EN] The synthesis and reactivity of single metal atoms in a low-valence state bound to just water, rather than to organic ligands or surfaces, is a major experimental challenge. Herein, we show a gram-scale wet synthesis ...
Cu-Ga3+-doped wurtzite ZnO interface as driving force for enhanced methanol production in co-precipitated Cu/ZnO/Ga2O3 catalysts

Cored, Jorge; Wittee, Christian; Liu, Lichen; Soriano-Rodríguez, José; Agostini, Giovanni; Solsona, Benjamin; Sánchez-Tovar, Rita; Concepción Heydorn, Patricia (Elsevier, 2022-03)

[EN] A detailed understanding of the interactions among the active components in gallium promoted Cu/ZnO catalysts, depending on the speciation of the gallium, are reported using in situ/operando spectroscopic studies, and ...
MOF-Mediated Synthesis of Supported Fe-Doped Pd Nanoparticles under Mild Conditions for Magnetically Recoverable Catalysis

Darawsheh, Mohanad D.; Mazarío-Santa-Pau, Jaime; Lopes, Christian W.; Gimenez-Marques, Monica; Domine, Marcelo Eduardo; Meira, Debora M.; Martínez, Jordan Santiago; Minguez Espallargas, Guillermo; Oña-Burgos, Pascual (John Wiley & Sons, 2020-10-27)

[EN] Metal-organic framework (MOF)-driven synthesis is considered as a promising alternative for the development of new catalytic materials with well-designed active sites. This synthetic approach is used here to gradually ...
Nature and evolution of Pd catalysts supported on activated carbon fibers during the catalytic reduction of bromate in water

Cerrillo, Jose L.; Lopes, Christian W.; Rey Garcia, Fernando; Agostini, Giovanni; Kiwi-Minsker, Lioubov; Palomares Gimeno, Antonio Eduardo (The Royal Society of Chemistry, 2020-06-07)

[EN] Catalytic hydrogenation of bromate using Pd catalysts supported on activated carbon fibers is a smart solution to treat bromate polluted water. These catalysts have been analyzed by different techniques for an in-deep ...
Rh2P Nanoparticles Stabilized by Carbon Patches for Hydroformylation of Olefins

Galdeano-Ruano, Carmen Piedad; Wittee Lopes, Christian; Motta Meira, Debora; Corma Canós, Avelino; Oña-Burgos, Pascual (American Chemical Society, 2021-10-22)

[EN] Rh2P nanoparticles (NPs) have been identified as suitable mimics of [Rh-I(Ph3P)(3)](+), the benchmark of homogeneous catalysts in liquid-phase hydroformylation. For this reason, a fitted synthetic strategy is required ...
Structural modulation and direct measurement of subnanometric bimetallic PtSn clusters confined in zeolites

Liu, Lichen; Lopez-Haro, Miguel; Lopes, Christian W.; Rojas-Buzo, Sergio; Concepción Heydorn, Patricia; Manzorro, Ramon; Simonelli, Laura; Sattler, Aaron; Serna, Pedro; Calvino, Jose J.; Corma Canós, Avelino (Nature Publishing Group, 2020-08)

[EN] Modulating the structures of subnanometric metal clusters at the atomic level is a great synthetic and characterization challenge in catalysis. Here, we show how the catalytic properties of subnanometric platinum ...
Structure and reactive properties of Nb-impregnated two-dimensional pillared MWW zeolites for total oxidation of volatile organic compounds

A. Schwanke; RB; Wittee Lopes, Christian; Debora Motta Meira; DÍAZ MORALES, URBANO MANUEL; Sibele B. Pergher; Katia Bernardo-Gusmao (Elsevier, 2021-11)

[EN] In this work, the structure and reactive properties of niobium (Nb)-impregnated MWW-type materials were evaluated for gas-phase total oxidation of volatile organic compounds, including BTX (benzene, toluene and o ...
Tailoring Lewis/Bronsted acid properties of MOF nodes via hydrothermal and solvothermal synthesis: simple approach with exceptional catalytic implications

Rojas-Buzo, Sergio; Bohigues, Benjamin; Lopes, Christian W.; Meira, Débora M.; Boronat Zaragoza, Mercedes; Moliner Marin, Manuel; Corma Canós, Avelino (The Royal Society of Chemistry, 2021-08-07)

[EN] The Lewis/Bronsted catalytic properties of the Metal-Organic Framework (MOF) nodes can be tuned by simply controlling the solvent employed in the synthetic procedure. In this work, we demonstrate that Hf-MOF-808 can ...
The Influence of the Support Nature and the Metal Precursor in the Activity of Pd-based Catalysts for the Bromate Reduction Reaction

Cerrillo, José L.; Lopes, Christian W.; Rey Garcia, Fernando; Palomares Gimeno, Antonio Eduardo (John Wiley & Sons, 2021-02-18)

[EN] Palladium catalysts supported on different materials (alumina, activated carbon and mixed oxide derived from hydrotalcite) and prepared with different metal precursors (nitrate, chloride and acetate) have been ...
Zeolite-driven Ag species during redox treatments and catalytic implications for SCO of NH3

W. Lopes, Christian; Martinez-Ortigosa, Joaquin; Góra-Marek, Kinga; Tarach, Karolina; Vidal Moya, José Alejandro; Palomares Gimeno, Antonio Eduardo; Agostini, Giovanni; Blasco Lanzuela, Teresa; Rey Garcia, Fernando (The Royal Society of Chemistry, 2021-12-14)

[EN] Supported silver species are among the most promising catalysts for the depletion of ammonia emission by selective catalytic oxidation (NH3-SCO). Here, an investigation on the influence of small pore CHA and RHO zeolite ...