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Listar por palabra clave "Zeolites"

Mostrando ítems 21-40 de 80

Determining the characteristics of a Co-zeolite to be active for the selective catalytic reduction of NOx with hydrocarbons

Palomares Gimeno, Antonio Eduardo; Franch Martí, Cristina; Corma Canós, Avelino (Elsevier, 2011-11-01)

The aim of this work is to study the activity, for the selective catalytic reduction (SCR) of NOx with hydrocarbons, of different containing cobalt zeolites, with different typologies and compositions. It has been found ...
Diels-Alder reactions in confined spaces: the influence of catalyst structure and the nature of active sites for the retro-Diels-Alder reaction

Cantin Sanz, Angel; Gomez, M. Victoria; de la Hoz, Antonio (Beilstein-Institut, 2016-10-13)

Diels-Alder cycloaddition between cyclopentadiene and p-benzoquinone has been studied in the confined space of a pure silica zeolite Beta and the impact on reaction rate due to the concentration effect within the pore and ...
Direct Synthesis of Nano-Ferrierite along the 10-Ring-Channel Direction Boosts Their Catalytic Behavior

Margarit Benavent, Vicente Juan; Díaz-Rey, Maria Del Rocio; Navarro Villalba, Mª Teresa; Martínez, Cristina; Corma Canós, Avelino (John Wiley & Sons, 2018)

[EN] Ferrierite zeolites with nanosized crystals and external surface areas higher than 250m(2)g(-1) have been prepared at relatively low synthesis temperature (120 degrees C) by means of the collaborative effect of two ...
Driving the Crystallization of Zeolites

Lu, Peng; Villaescusa Alonso, Luis Angel; Camblor, M. A. (John Wiley & Sons, 2018-07)

[EN] The synthesis of zeolites with new structures and/or improved properties heavily relies on trial and error efforts that are not entirely blind, as the large empirical background accumulated for the last 7 decades can ...
Effect of zeolite structure on the selective catalytic reduction of NO with ammonia over Mn-Fe supported on ZSM-5, BEA, MOR and FER

Ben-Younes, Nada; Martinez-Ortigosa, Joaquin; Marie, Olivier; Blasco Lanzuela, Teresa; Mhamdi, Mourad (Springer-Verlag, 2021-05)

[EN] A series of catalysts based on Mn-Fe loaded zeolites was prepared by impregnation and their activity in the selective catalytic reduction of NO with ammonia (NH3-SCR) was investigated. The highest catalytic conversion ...
Effects of cage topology on ethylene adsorption mechanism in silver exchanged CHA and RHO zeolites: An Inelastic Neutron Scattering and Density Functional study

De Marcos-Galán, Alessandra; E Silva de Almeida, Gabrielli Maria; Martinez-Ortigosa, Joaquin; SASTRE NAVARRO, GERMAN IGNACIO; Jiménez-Ruiz, M.; Rey Garcia, Fernando; Blasco Lanzuela, Teresa (Elsevier, 2024-03-01)

[EN] Zeolite-based adsorbents have been successfully used for many challenging separations due to their tunable properties. A particularly notable application involves the separation of light olefins from paraffins, wherein ...
Estudio de apertura estereoselectiva de epóxidos en presencia de zeolitas

Martinez Moreno, Maria Cruz (Universitat Politècnica de València, 2021-12-01)

[ES] Las zeolitas son aluminosilicatos cristalinos microporosos con estructuras tridimensionales y sistemas de canales y cavidades internos de dimensiones moleculares. Debido a la estabilidad estructural y térmica que ...
Estudio de la eliminación/recuperación de nitrógeno en el permeado de la ultrafiltración de la línea de aguas de una EDAR mediante eliminación por nitrificación parcial y recuperación con zeolitas

Godifredo Calvo, Jesús (Universitat Politècnica de València, 2024-03-28)

[ES] Los procesos convencionales de depuración del agua residual presentan un elevado consumo energético y no permiten la recuperación de los recursos presentes en el agua. En la transformación de las Estaciones Depuradoras ...
Estudio de la estabilidad de distintos tipos de agentes directores de estructura orgánicos en la síntesis de zeolitas

Simancas Coloma, Jorge (Universitat Politècnica de València, 2013-06-17)

[ES] Estudio de la estabilidad de agentes directores de estructura (ADE) en síntesis de Zeolitas usando ADE tipo Tetraalquilamonio, Tetraalquilfosfonio y bases de Fosfaceno.
Estudio de la síntesis de sólidos microporosos usando amonios cuaternarios derivados del 4,4'-bis(clorometil)-1,1'-bifenil como agentes directores de estructura en la sintesis hidrotermal de zeolitas

Hernandis Altur, Vicente (Universitat Politècnica de València, 2019-07-30)

[ES] En este trabajo de fin de grado se han sintetizado materiales microporosos, zeolitas, a partir de derivados del 4,4'-bis(clorometil)-1,1'-bifenil sustituyendo los cloros por aminas terciarias como son la trimetilamina, ...
Factors Controlling the Acidity of Zeolites

Boronat Zaragoza, Mercedes; Corma Canós, Avelino (Springer Verlag, 2015-01)

Most industrial applications of zeolites as catalysts rely on their Bronsted acidity properties. However, neither quantifying acid strength in solids nor correlating acidity with catalytic activity is straightforward. The ...
Fe-Containing Zeolites for NH3-SCR of NOx: Effect of Structure, Synthesis Procedure, and Chemical Composition on Catalytic Performance and Stability

Martín-García, Nuria; Vennestrom; Peter Nicolai Ravnborg; Thogersen, Joakim Reimer; Moliner Marin, Manuel; Corma Canós, Avelino (John Wiley & Sons, 2017)

[EN] The direct preparation of different iron-containing Beta and CHA zeolites has been attempted under diverse synthesis conditions, including in alkaline and fluoride media, to evaluate the influence of their physicochemical ...
From biomass to chemicals: Synthesis of precursors of biodegradable surfactants from 5-hydroxymethylfurfural

Arias Carrascal, Karen Sulay; S.I. AL-RESAYES; Climent Olmedo, María José; Corma Canós, Avelino; Iborra Chornet, Sara (Wiley-VCH Verlag GmbH&Co. KGaA, 2013-01)

The selective acetalization of 5-hydroxymethylfurfural (HMF) with long chain alkyl alcohols has been performed to obtain precursor of molecules with surfactants properties. If direct acetalization of HMF with n-octanol is ...
Functional Ag-Exchanged Zeolites as Biocide Agents

Cerrillo, José Luis; Palomares Gimeno, Antonio Eduardo; Rey Garcia, Fernando; Valencia Valencia, Susana; Pérez-Gago, María B.; Villamón-Pérez, Diana; Palou-Valls, Lluis (John Wiley & Sons, 2018-05-02)

[EN] Materials based on silver are used for controlling different pathogenic microorganisms. However, the influence of the silver carrier in the biocidal activity of the material has been scarcely reported. The present ...
Ge-Based Hybrid Composites from Ge-Rich Zeolites as Highly Conductive and Stable Electronic Materials

Rodríguez-Fernández, Aida; Atienzar Corvillo, Pedro Enrique; Martínez, Cristina; Román-Leshkov, Yuriy; Moliner Marin, Manuel (American Chemical Society, 2019-09-24)

[EN] Ge-containing zeolites were used as precursors for the synthesis of highly conductive and stable hybrid electronic materials by postsynthetic thermal treatment of the crystals in the presence of an olefin. Treating ...
Geopolymers based on spent catalyst residue from a fluid catalytic cracking (FCC) process

Rodriguez Martinez, Erich David; Bernal, Susan A.; Provis, John L.; Gehman, John D.; Monzó Balbuena, José Mª; Paya Bernabeu, Jorge Juan; Borrachero Rosado, María Victoria (Elsevier, 2013-07)

This paper assesses the use of alkali activation technology in the valorization of a spent fluid catalytic cracking (FCC) catalyst, which is a residue derived from the oil-cracking process, to produce geopolymer binders. ...
Identification of Active Surface Species for Friedel Crafts Acylation and Koch Carbonylation Reactions by in situ Solid-State NMR Spectroscopy

Lezcano González, Inés; Vidal Moya, José Alejandro; Boronat Zaragoza, Mercedes; Blasco Lanzuela, Teresa; Corma Canós, Avelino (Wiley-VCH Verlag, 2013-05-03)

Finding the culprits: In situ NMR spectroscopy combined with theoretical calculations show the formation of acetyl species covalently bound to framework oxygen atoms in acid zeolites. These species, and not the usually ...
IDM-1: A Zeolite with Intersecting Medium and Extra-Large Pores Built as an Expansion of Zeolite MFI

Villaescusa Alonso, Luis Angel; Li, Jian; Gao, Zihao; Sun, Junliang; Camblor, Miguel A. (John Wiley & Sons, 2020-07-06)

[EN] IDM-1 is a new silica zeolite with an ordered and well-defined framework constructed by alternating pentasil layers and interrupted layers, giving rise to an intersecting system of straight medium pores and undulating ...
In-Situ-Generated Active Hf-hydride in Zeolites for the Tandem N-Alkylation of Amines with Benzyl Alcohol

Rojas-Buzo, Sergio; Concepción Heydorn, Patricia; Corma Canós, Avelino; Moliner Marin, Manuel; Boronat Zaragoza, Mercedes (American Chemical Society, 2021-07-02)

[EN] In this work, we have studied the catalytic activity of different silicates (MFI, MCM-41, and Beta) containing Lewis acid sites (including Sn, Ti, Zr, and Hf) for the tandem N-alkylation reaction of aniline with benzyl ...
Influence of lattice stability on hydrothermal deactivation of Cu-ZSM-5 and Cu-IM-5 zeolites for selective catalytic reduction of NOx by NH3

VENNESTROM, PETER NICOLAI RAVNBORG; Janssens, Ton V. W.; Kustov, Arkady; Grill, Marie; Puig-Molina, Anna; Lundegaard, Lars F.; Tiruvalam, Ramchandra R.; Concepción Heydorn, Patricia; Corma Canós, Avelino (Elsevier, 2014-01)

Copper-exchanged zeolites are well-known catalysts for the selective catalytic reduction of nitrogen oxides by ammonia (NH3-SCR). To determine the influence of framework stability on catalyst deactivation, two zeolite ...