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Listar por palabra clave "IR spectroscopy"

Mostrando ítems 1-8 de 8

Combined Spectroscopic and Computational Study of Nitrobenzene Activation on Non-Noble Metals-Based Mono- and Bimetallic Catalysts

Millán-Cabrera, Reisel; Soriano Rodríguez, Mª Dolores; Cerdá-Moreno, Cristina; Boronat Zaragoza, Mercedes; Concepción Heydorn, Patricia (MDPI AG, 2021-08)

[EN] In this paper, substituted anilines are industrially obtained by direct hydrogenation of nitroaromatic compounds with molecular H-2 using metals as catalysts. Previous theoretical studies proposed that the mechanism ...
Combined theoretical and spectroscopic mechanistic studies for improving activity and selectivity in heterogeneous catalysis

Boronat Zaragoza, Mercedes; Concepción Heydorn, Patricia (Elsevier, 2017-05-01)

[EN] By combining theoretical modelling, in situ spectroscopy and kinetic studies it is possible to understand, at the molecular level, the role that the different types of active centres co-existing on real heterogeneous ...
Copper sites in zeolites- quantitative IR studies

Gora-Marek, K.; Palomares Gimeno, Antonio Eduardo; Glanowska, A.; Sadowska, K.; Datka, J. (ELSEVIER SCIENCE BV, 2012)

[EN] Quantitative IR studies were realized in order to determine the concentration of various kinds of Cu sites in zeolites CuZSM-5, CulTQ-2, CuTNU-9, and CuY. These zeolites contained Cu in the form of Cu2+, Cu+ (in the ...
Densities and refractive indices of ethane and ethylene at astrophysically relevant temperatures

Satorre, M. Á.; Millán Verdú, Carlos; Molpeceres, Germán; Luna Molina, Ramón; Maté, Belén; Domingo Beltran, Manuel; Escribano, Rafael; Santonja Moltó, Mª Del Carmen (Elsevier, 2017)

[EN] We report the density and refractive index, at 633 nm, of ethane and ethylene ices at temperatures from 13 to 65 K, measured by double laser interferometry and a cryogenic quartz crystal microbalance in a high vacuum ...
Desilication of highly siliceous zeolite ZSM-5 with NaOH and NaOH/tetrabutylamine hydroxide

Sadowska, K; Góra-Marek, Kinga; Drozdek, Marek; Kustrowski, Piotr; Datka, J; Martínez-Triguero, Joaquín; Rey Garcia, Fernando (Elsevier, 2013-03-01)

The results of both chemical and XPS analysis pointed out that desilication of highly siliceous ZSM-5 of Si/Al = 164 was more effective in the surface zone than in the bulk, contrary to zeolite ZSM-5 of Si/Al = 31.6. ...
Forecasting wine phenolic composition from infrared spectra of grapes extracts and monitoring of fermentations with optimised time-specific prediction models

Lambrecht, Kiera; Fonseca Diaz, Valeria; Saeys, Wouter; Louw, Tobias; Du toit, Wessel; Aleixandre Tudo, José (Elsevier, 2024-05-15)

[EN] Incorporating monitoring and forecasting technologies has the potential to enhance the different aspects of winemaking. By monitoring certain chemical parameters, it is possible to evaluate the progress of the ...
Identification of Distinct Copper Species in Cu-CHA Samples Using NO as Probe Molecule. A Combined IR Spectroscopic and DFT Study

Concepción Heydorn, Patricia; Boronat Zaragoza, Mercedes; Millan, Reisel; Moliner Marin, Manuel; Corma Canós, Avelino (Springer-Verlag, 2017)

[EN] Combining IR spectroscopy of NO adsorption on copper exchanged molecular sieves with the chabazite structure, i.e. Cu-SAPO-34 and Cu-SSZ-13, and theoretical calculations, different types of copper species have ...
Zeolite- and MgO-Supported Molecular Iridium Complexes: Support and Ligand Effects in Catalysis of Ethene Hydrogenation and H-D Exchange in the Conversion of H2 + D2

Lu, Jing; Serna Merino, Pedro Manuel; Gates, Bruce C. (American Chemical Society, 2011)

[EN] Zeolite- and MgO-supported mononuclear iridium diethene complexes were formed by the reaction of Ir(C2H4)2(acac) (acac = acetylacetonate, C5H7O2¿) with each support. Changes in the ligand environment of the supported ...