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Listar por palabra clave "Zeolite"

Mostrando ítems 1-20 de 53

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"One-pot" synthesis of 5-(Hydroxymethyl)furfural from carbohydrates using tin-Beta zeolite

Nikolla, Eranda; Román-Leshkov, Yuriy; Moliner Marin, Manuel; Davis, Mark E. (American Chemical Society, 2011)

[EN] Conversion of carbohydrates to 5-(hydroxymethyl)furfural (HMF) may provide a step forward toward achieving a renewable biomass-based chemicals and fuels platform. Recently, we reported that a tin-containing, high-silica ...
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 ...
A new microporous zeolitic silicoborate (ITQ-52) with interconnected small and medium pores

Simancas Coloma, Raquel; Jorda Moret, Jose Luis; Rey Garcia, Fernando; Corma Canós, Avelino; Cantin Sanz, Angel; Peral, Inmaculada; Popescu, Catalin (American Chemical Society, 2014-03-05)

A new zeolite (named as ITQ-52) having large cavities and small and medium channels has been synthesized. This was achieved by using a new family of amino-phosphonium cations as organic structure directing agents (OSDA). ...
Carbonylation of dimethyl ether in mordenite using Inelastic Neutron Scattering

Jiménez-Ruiz, Mónica; Lemishko, Tetiana; Rey Garcia, Fernando; SASTRE NAVARRO, GERMAN IGNACIO (Elsevier, 2024-01-15)

[EN] Zeolite mordenite (MOR, Si/Al =10) was used as catalyst for the reaction between CO and dimethyl ether (DME) to give methyl acetate. Since the reaction is catalysed by Bronsted acid sites, Inelastic Neutron Scattering ...
Cation Gating and Relocation during the Highly Selective Trapdoor Adsorption of CO2 on Univalent Cation Forms of Zeolite Rho

Lozinska, Magdalena M.; Mowat, John P. S.; Wright, Paul A.; Thompson, Stephen P.; Jorda Moret, Jose Luis; Palomino Roca, Miguel; Valencia Valencia, Susana; Rey Garcia, Fernando (American Chemical Society, 2014-03-25)

Adsorption of CO2 and CH4 has been measured on the Na-, K-, and Cs-forms of zeolite Rho (0 9 bar; 283 333 K). Although CH4 is excluded, CO2 is readily taken up, although the uptake at low pressures decreases strongly, in ...
Charge matching between the occluded organic cations and zeolite framework as structure directing effect in zeolite synthesis

Marqués, Blanca; Leiva Herrero, Sandra; Cantin Sanz, Angel; Jorda Moret, Jose Luis; Sabater Picot, Mª José; Corma Canós, Avelino; Valencia Valencia, Susana; Rey Garcia, Fernando (Elsevier, 2008)

[EN] The charge matching effect has been found to be an important parameter driving the synthesis towards particular zeolite frameworks. This has been evidenced by isomorphous incorporation of Aluminium into the zeolite ...
Chemical and Structural Parameter Connecting Cavity Architecture, Confined Hydrocarbon Pool Species, and MTO Product Selectivity in Small-Pore Cage-Based Zeolites

Ferri-Vicedo, Pau; Li, Chengeng; Paris, Cecilia; Vidal Moya, José Alejandro; Moliner Marin, Manuel; Boronat Zaragoza, Mercedes; Corma Canós, Avelino (American Chemical Society, 2019-12-06)

[EN] The catalysts used in the methanol-to-olefins (MTO) reaction are considered dual systems comprising an inorganic zeolite framework and organic compounds hosted inside that act as cocatalysts. The influence of zeolite ...
Computational Screening of Structure-Directing Agents for the Synthesis of Pure Silica ITE Zeolite

León-Rubio, Santiago; SASTRE NAVARRO, GERMAN IGNACIO (American Chemical Society, 2020-08-06)

[EN] "Shape" was the first criterion claimed to explain the specificity between organic structure-directing agents (OSDAs) and zeolite micropores. With the advent of computational chemistry methods applied to study the ...
Computational study of heterogeneous catalytic systems. Kinetic and structural insights from Density Functional Theory

Millan Cabrera, Reisel (Universitat Politècnica de València, 2021-02-19)

[ES] En este trabajo estudiamos dos reacciones catalíticas relevantes para la industria y la localización del anión fluoruro en la zeolita RTH, sintetizada en medio fluoruro. El capítulo 3 es el primer capítulo de resultados, ...
Control of zeolite framework flexibility and pore topology for separation of ethane and ethylene

Bereciartua-Pérez, Pablo Javier; Cantin Sanz, Angel; Corma Canós, Avelino; Jorda Moret, Jose Luis; Palomino Roca, Miguel; Rey Garcia, Fernando; Valencia Valencia, Susana; Corcoran Jr., Edward W.; Kortunov, Pavel; Ravikovitch, Peter I.; Burton, Allen; Yoon, Chris; Wang, Yu; Paur, Charanjit; Guzman, Javier; Bishop, Adeana R.; Casty, Gary L. (American Association for the Advancement of Science (AAAS), 2017-11-24)

[EN] The discovery of new materials for separating ethylene from ethane by adsorption, instead of using cryogenic distillation, is a key milestone for molecular separations because of the multiple and widely extended uses ...
Controllable synthesis of metal nanoparticles for catalytic applications

Liu, Lichen (Universitat Politècnica de València, 2015-02-24)

[EN] In this thesis, I have discussed the synthesis of Cu nanoparticles and their applications in C-N coupling reactions. I find that Cu nanoparticles will decompose into Cu clusters and Cu clusters are the real active ...
Design of bi-functional Ni-zeolites for ethylene oligomerization: Controlling Ni speciation and zeolite properties by one-pot and post-synthetic Ni incorporation

Martínez-Gómez-Aldaraví, Adrián; Paris, Cecilia; Moliner Marin, Manuel; Martínez, Cristina (Elsevier, 2023-10)

[EN] The design of diverse Ni-zeolites has been performed attempting to control different physico-chemical properties of the zeolite supports as well as the Ni speciation to study their influence on the industrially relevant ...
Design of improved hydrocracking catalysts by increasing the proximity between acid and metallic sites

Francis, J.; Guillon, E.; Bats, Nicolas; Pichon, C.; Corma Canós, Avelino; Simon, L.J. (Elsevier, 2011-12-15)

A new approach was undertaken to increase the bifunctionality of USY zeolite based catalyst. Nickel metallic phase was first impregnated onto USY zeolite and composite catalysts NiMo/[γ-Al2O3 + (Ni)/USY] were prepared from ...
Dielectric relaxation, ac conductivity and electric modulus in poly(vinylidene fluoride)/NaY zeolite composites

Lopes, A.C.; Costa, C.M.; Sabater i Serra, Roser; Neves, I.C.; Gómez Ribelles, José Luís; Lanceros-Mendez, S. (Elsevier, 2013-03-21)

[EN] Poly(vinylidene fluoride)/zeolite composites prepared by solvent casting at 190 °C have been investigated by scanning electronic microscopy, Fourier transformed infrared spectroscopy and broadband dielectric relaxation ...
Direct conversion of carbon dioxide into liquid fuels and chemicals by coupling green hydrogen at high temperature

Li, Yubing; Zeng, Lei; Pang, Ge; Wei, Xueer; Wang, Mengheng; Cheng, Kang; Kang, Jincan; Serra Alfaro, José Manuel; Zhang, Qinghong; Wang, Ye (Elsevier, 2023-05-05)

[EN] The chemical conversion of CO2 into hydrocarbon fuels and chemicals using green hydrogen not only utilizes abundant CO2 as a carbon feedstock but also enables the storage of hydrogen. Herein, we investigate the direct ...
Diseño racional de materiales zeolíticos: efectos de confinamiento y control de centros metálicos en posiciones de red y extra-red en aplicaciones de interés

Rodríguez Fernández, Aida (Universitat Politècnica de València, 2024-02-29)

[ES] Las zeolitas son catalizadores ampliamente utilizados en una gran variedad de procesos químicos, por lo que la optimización de sus propiedades físico-químicas es fundamental para mejorar su aplicación en procesos de ...
Effect of cage size on the selective conversion of methanol to light olefins

Bhawe, Yashodhan; Moliner Marin, Manuel; Lunn, Jonathan D.; Liu, Yu; Malek, Andrzej; Davis, Mark (American Chemical Society, 2012-10)

[EN] Zeolites that contain eight-membered ring pores but different cavity geometries (LEV, CHA, and AFX structure types) are synthesized at similar Si/Al ratios and crystal sizes. These materials are tested as catalysts ...
Estudio de la eliminación de naranja de metilo y diclofenaco presentes en el agua mediante diferentes tipos de zeolita

Catalá Muñoz, Guillem (Universitat Politècnica de València, 2024-09-24)

[ES] La reciente preocupación por la presencia de contaminantes emergentes en el medio natural requiere el desarrollo de técnicas de eliminación efectivas. Este tipo de contaminación son sustancias químicas que se detectan ...
Heterogeneous Metal Catalysts: From Single Atoms to Nanoclusters and Nanoparticles

Liu, Lichen (Universitat Politècnica de València, 2019-10-02)

Las especies de metal con diferentes tamaños (átomos individuales, nanocristales y nanopartículas) muestran un comportamiento catalítico diferente para diversas reacciones catalíticas heterogéneas. Se ha demostrado en la ...
Inelastic neutron scattering study of Brønsted acidity in LTA zeolite

Lemishko, Tetiana (Universitat Politècnica de València, 2019-05-02)

[ES] En esta tesis se realiza un estudio de acidez de zeolita LTA con la relación Si/Al 5 y 40 utilizando la técnica de dispersión inelástica de neutrones (INS) en combinación con otras tecnicas como la modelización ...