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Browsing by Subject "Zeolites"

Now showing items 1-20 of 70

A Bifunctional Mechanism for Ethene Dimerization: Catalysis by Rhodium Complexes on Zeolite HY in the Absence of Halides

Serna Merino, Pedro Manuel; Gates, B. C. (Wiley-VCH Verlag, 2011-04-29)

[EN] No ligands needed: Rhodium complexes supported on HY zeolite catalyze the formation of C[BOND]C bonds by a new mechanism involving cooperation between the metal species and Brønsted acid sites of the zeolite support ...
A Multi-Nuclear MAS-NMR Study on the Structural Properties of Silicalite-1 Zeolite Synthesized Using N- and P-Based Organic Structure Directing Agents

Martinez-Ortigosa, Joaquin; Simancas, Jorge; Vidal Moya, José Alejandro; Rey Garcia, Fernando; Valencia Valencia, Susana; Blasco Lanzuela, Teresa (MDPI AG, 2021-08)

[EN] The nature of organic structure directing agents (OSDAs) is of paramount importance in the final properties of zeolites, particularly the framework and porosity. Recently, the use of P-containing OSDAs has been employed ...
Ab initio design of efficient zeolite catalysts for methanol and hydrocarbons conversion

Ferri Vicedo, Pau (Universitat Politècnica de València, 2023-05-22)

[ES] Toda esta disertación ha utilizado la química computacional como herramienta fundamental para el análisis científico. Por ello, en el Capítulo 2 se explican los modelos y métodos teóricos sobre este tema. La primera ...
Advances in the synthesis of titanosilicates: From the medium pore TS-1 zeolite to highly-accessible ordered materials

Moliner Marin, Manuel; Corma Canós, Avelino (Elsevier, 2014-05-01)

[EN] In the present review, we would like to cover the most fundamental advances achieved in the design of ordered titanosilicates since the earlier discovery of TS-1 reported by EniChem in the mid-eighties. The invention ...
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 ...
Applications of Zeolites to C1 Chemistry: Recent Advances, Challenges, and Opportunities

Zhang, Qiang; Yu, Jihong; Corma Canós, Avelino (John Wiley & Sons, 2020-11-05)

[EN] C1 chemistry, which is the catalytic transformation of C1 molecules including CO, CO2, CH4, CH3OH, and HCOOH, plays an important role in providing energy and chemical supplies while meeting environmental requirements. ...
Bioethanol steam reforming on Ni-based modified mordenite. Effect of mesoporosity, acid sites and alkaline metals

Da Costa Serra, Javier Francisco; Navarro Ruiz, María Teresa; Rey Garcia, Fernando; Chica, Antonio (Elsevier, 2012-04)

Support plays an important role in the preparation of highly active and selective bioethanol steam reforming catalysts since it helps in the dispersion of metal particles and enhances its activity via metal-support ...
Building zeolites from precrystallized units: nanoscale architecture

Li, Chengeng; Moliner Marin, Manuel; Corma Canós, Avelino (John Wiley & Sons, 2018-11-19)

[EN] Since the early reports by Barrer in the 1940s on converting natural minerals into synthetic zeolites, the use of precrystallized zeolites as crucial inorganic directing agents to synthesize other crystalline zeolites ...
Caracterización estructural de zeolitas por Resonancia Magnetica Nuclear y su aplicación como catalizadores

Martínez Ortigosa, Joaquín (Universitat Politècnica de València, 2021-04-26)

[ES] Las zeolitas son sólidos cristalinos microporosos con canales y cavidades de tamaños moleculares, que pueden presentar gran variedad de estructuras y composición química, lo que las hace útiles como catalizadores en ...
Carbonylation of Methanol on Metal Acid Zeolites: Evidence for a Mechanism Involving a Multisite Active Center

Blasco Lanzuela, Teresa; Boronat Zaragoza, Mercedes; Concepción Heydorn, Patricia; Corma Canós, Avelino; Law, David; Vidal Moya, José Alejandro (John Wiley & Sons, 2007)
Catalitzadors sòlids àcids de Lewis en reaccions de mukaiyama i de tipus mukaiyama. Un exemple d'aproximació a la química verda

Garro Martínez, Raúl (Universitat Politècnica de València, 2008-05-06)

En el presente trabajo se ha estudiado la actividad catalítica de diferentes tamices moleculares sólidos con acidez de Lewis, sintetizados en el Instituto de Tecnología Química, utilizándolos como catalizadores en reacciones ...
Catalizadores metálicos estructurados en reacciones de Química Sostenible

López Hernández, Irene (Universitat Politècnica de València, 2021-09-02)

[ES] En esta tesis doctoral se ha investigado sobre el empleo de catalizadores metálicos estructurados en diversas reacciones de Química Sostenible. En primer lugar, se ha estudiado la eliminación de los NOX mediante su ...
Ce-modified zeolite BEA catalysts for the trichloroethylene oxidation. The role of the different and necessary active sites

Golabek, Kinga; Palomares Gimeno, Antonio Eduardo; Martínez-Triguero, Joaquín; Tarach, Karolina A.; Kruczala, Krzysztof; Girman, Vladimir; Góra-Marek, Kinga (Elsevier, 2019-12-15)

[EN] This paper reports the activity of different Ce-BEA zeolites for the catalytic oxidation of trichloroethylene and it is focused on determining the nature of the catalyst active sites. The study was made by using a ...
Competitive ultrafast electron and proton transfer reactions within titania and silica mesoporous materials

Gil, Michael; Organero, Juan Angel; Navarro Ruiz, María Teresa; Corma Canós, Avelino; Douhal, Abderrazzak (American Chemical Society, 2012-07-26)

[EN] We report on UV-visible absorption and emission and ultrafast emission dynamics of 7-hydroxyquinoline (7HQ) encapsulated within titania-doped silicates (mesoporous and unstructured) and purely TiO2 nanomaterials. When ...
Confined Photodynamics of an Organic Dye for Solar Cells Encapsulated in Titanium-Doped Mesoporous Molecular Materials

Ziólek, Marcin; Martín, Cristina; Navarro Ruiz, María Teresa; García Gómez, Hermenegildo; Douhal, Abderrazzak (2011-04-12)

[EN] A triphenylamine dye (TPC1) encapsulated in titanium-doped mesoporous silica structures as alternative materials for dye-sensitized solar cells has been studied by means of stationary absorption and emission as well ...
Control de las propiedades ácidas de las zeolitas MFI y RTH sintetizadas con agentes directores de estructura fosforados

Fernandez Vazquez, Alicia (Universitat Politècnica de València, 2021-01-28)

[ES] Las zeolitas son sólidos cristalinos microporosos, generalmente aluminosilicatos, que se utilizan ampliamente como catalizadores para llevar a cabo diferentes reacciones de interés industrial. Uno de los principales ...
Control of the Reaction Mechanism of Alkylaromatics Transalkylation by Means of Molecular Confinement Effects Associated to Zeolite Channel Architecture

Margarit Benavent, Vicente Juan; OSMAN, MOGAHID; Al-Khattaf, Sulaiman; Martínez, Cristina; Boronat Zaragoza, Mercedes; Corma Canós, Avelino (American Chemical Society, 2019-07-05)

[EN] Transalkylation of alkylaromatics catalyzed by acid zeolites is a process widely employed in the petrochemical industry for upgrading aromatic fractions. The reaction mechanism is complex as it can proceed either by ...
Design of Zeolites with Specific Architectures Using Self-Assembled Aromatic Organic Structure Directing Agents

Moliner Marin, Manuel (Springer Verlag (Germany), 2015-05)

[EN] A rationalized design of the organic structure directing agents (OSDAs) allows the preparation of zeolites with specific framework topologies, crystal sizes and/or chemical compositions. In the last years, organic ...
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 ...