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Publicaciones (2023)

Publicaciones clasificadas por fecha en orden descendente

Modification of a commercial activated carbon with nitrogen and boron: Hydrogen storage application

Autores: Arturo Morandé, Patricio Lillo, Elodie Blanco, César Pazo, Ana Belén Dongil, Ximena Zarat, Mario Saavedra-Torres, Eduardo Schott, Roberto Canales, Alvaro Videla, Néstor Escalona

Artículo. Journal of Energy Storage

Fecha: 1 August 2023, 107193
Doi: 10.1016/j.est.2023.107193

The present study evaluates the effect of heteroatom doping (N and B) and thermal treatment modification of activated carbon, in different sequences over hydrogen storage capacity. All the materials were characterized by N2-physisorption, XRD, TPD, and XPS. H2 adsorption was measured at −196 °C and correlated with physico-chemical properties, while a density-functional theory model was employed to analyze the hydrogen adsorption. Results have shown that there is an effect of [read more]

Theoretical and Experimental Study for Cross-Coupling Aldol Condensation over Mono- and Bimetallic UiO-66 Nanocatalysts

Autores: Cesar Pazo-Carballo, Elodie Blanco, Esteban Camu, Angel Leiva, Yoan Hidalgo-Rosa, Ximena Zarate, Ana Belen Dongil, Eduardo Schott* and Nestor Escalona

Artículo. ACS Appl. Nano Mater. 2023, 6, 7, 5422–5433

Fecha: April 3, 2023
Doi: 10.1021/acsanm.2c05555

Mono- and bimetallic UiO-66 nanocatalysts were synthesized using the solvothermal synthesis method and evaluated in the aldol condensation reaction of benzaldehyde and acetone in a batch reactor. N2 physisorption, thermogravimetric analysis, temperature-programmed desorption of ammonia, X-ray diffraction, field-emission scanning electron microscopy–energy-dispersive X-ray, X-ray photoelectron spectroscopy, potentiometric titration, and Fourier transform infrared were used to characterize the nanocatalysts. The higher activity exhibited [read more]

A and B site Co-doping of CaMnO3: a route to enhanced heat storage properties

Autores: Mastronardo, E; Qian, X; Coronado, JM; Haile, SM

J. Mater. Chem. A. vol: 11. page: 2050-7488.
Fecha: APR 25. 2023.
Doi: 10.1039/d2ta07779e.

The successful commercialization of concentrating solar power (CSP) plants requires effective energy storage for the supply of power on demand during solar transients. High-temperature thermal energy storage (>= 700 degrees C up to 1200 degrees C) has the potential to address storage needs and power capacity owing to the efficiency gains from a high-temperature operation. Recently, doped CaMnO3 has been identified as a promising candidate for thermochemical heat storage in CSP plants. Herein, we aim at tuning the CaMnO3 heat storage [read more]

Hybrid Organometallic and Enzymatic Tandem Catalysis for Oxyfunctionalisation Reactions

Autores: Domestici, C; Wu, YQ; Hilberath, T; Alcalde, M; Hollmann, F; Macchioni, A

Artículo; Early Access.
ChemCatChem. vol: . page: 1867-3880.
Fecha: . .
Doi: 10.1002/cctc.202201623.

Unspecific peroxygenases (UPOs) are promising biocatalysts for oxyfunctionalisation reactions, owing to their simplicity of handling, stability and robustness. A limitation of using UPOs on a large scale is their deactivation in the presence of even rather modest concentrations of H2O2, requiring a constant and controlled supply of low amount of H2O2. Herein, we report an organometallic complex [Cp*Ir(pica)NO3] {pica=picolinamidate=kappa(2)-pyridine-2-carboxamide ion (-1)} 1 capable of efficiently regenerating FMNH2 from FMN (TOF=350 h(-1), 298 K), driven by NaHCOO; FMNH2, in turn, [read more]

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Autores: Chebude, Y; Gonfa, G; Diaz, I

Bull. Chem. Soc. Ethiop.. vol: 37. page: 1011-3924.
Fecha: . 2023.
Doi: 10.4314/bcse.v37i3.12.

Vernonia oil is a naturally epoxidized triglyceride oil extracted from the seed of Vernonia galamensis, a native plant in East Africa. After hydrolysis to vernolic acid (VA) and derivatization, vernolic acid methyl ester (VAME) is synthesized and used to functionalize ordered mesoporous materials (OMM). Al-MCM-41 with Si/Al ratio of 15, pure silica SBA-15 and periodic mesoporous organosilica (PMO) are employed as supports exploring the different surface properties. Following optimization of the VAME/OMM ratios, selected samples, i.e. those with 13% VAME, were impregnated with AgNO3 [read more]

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Active and durable R2MnRuO7 pyrochlores with low Ru content for acidic oxygen evolution


Dmitry Galyamin, Jorge Torrero, Isabel Rodríguez, Manuel J. Kolb, Pilar Ferrer, Laura Pascual, Mohamed Abdel Salam, Diego Gianolio, Verónica Celorrio, Mohamed Mokhtar, Daniel Garcia Sanchez, Aldo Saul Gago, Kaspar Andreas Friedrich, Miguel A. Peña, José Antonio Alonso, Federico Calle-Vallejo, María Retuerto & Sergio Rojas

Nature Communications volume 14, Article number: 2010 (2023)
Fecha: april-10. 2023.
Doi: 10.1038/s41467-023-37665-9

The production of green hydrogen in water electrolyzers is limited by the oxygen evolution reaction (OER). State-of-the-art electrocatalysts are based on Ir. Ru electrocatalysts are a suitable alternative provided their performance is improved. Here we show that low-Ru-content pyrochlores (R2MnRuO7, R = Y, Tb and Dy) display high activity and durability for the OER in acidic media. Y2MnRuO7 is the most stable catalyst, displaying 1.5 V [read more]

Highly active and stable OER electrocatalysts derived from Sr2MIrO6 for proton exchange membrane water electrolyzers


María Retuerto, Laura Pascual, Jorge Torrero, Mohamed Abdel Salam, Álvaro Tolosana-Moranchel, Diego Gianolio, Pilar Ferrer, Paula Kayser, Vincent Wilke, Svenja Stiber, Verónica Celorrio, Mohamed Mokthar, Daniel García Sanchez, Aldo Saul Gago, Kaspar Andreas Friedrich, Miguel Antonio Peña, José Antonio Alonso, Sergio Rojas.

Nature Communications volume 13, Article number: 7935 (2022)66.
Fecha: mar-01. 2023.
Doi: 10.1038/s41467-022-35631-5

Proton exchange membrane water electrolysis is a promising technology to produce green hydrogen from renewables, as it can efficiently achieve high current densities. Lowering iridium amount in oxygen evolution reaction electrocatalysts is critical for achieving cost-effective production of green hydrogen. In this work, we develop catalysts from Ir double perovskites. Sr2CaIrO6 achieves 10 mA cm−2 at only 1.48 V. The surface of the perovskite reconstructs when immersed [read more]

Influence of the solid titanium source on the activity of La1_xTixFeO3 photo-CWPO catalysts under UV-A light

Autores: Garcia-Munoz, P; Fresno, F; Lefevre, C; Robert, D; Keller, N

Catal. Today. vol: 413. page: 0920-5861.
Fecha: mar-15. 2023.
Doi: 10.1016/j.cattod.2022.12.005.

In the search for more efficient low-temperature catalysts able to oxidise biorecalcitrant pollutants in water, the selective substitution of La3+ by Ti3+ cations was reported to boost the UV-A light driven activity of LaFeO3 orthoferrites as H2O2-mediated photo-CWPO catalysts. La1_xTixFeO3 catalysts with 0 < x < 0.11 were obtained by a modified Pechini sol-gel route via the addition of a solid source of titanium during the synthesis. By using a span of crystallized and amorphous TiO2, the influence of the titanium source [read more]

Solar hydrogen production from ethanol-water vapours over metal/TiO2 photocatalysts supported on ?-SiC alveolar foams

Autores: Garcia-Munoz, P; Ivanez, J; O’Shea, VAD; Keller, N; Fresno, F

Catal. Today. vol: 413. page: 0920-5861.
Fecha: mar-15. 2023.
Doi: 10.1016/j.cattod.2022.12.018.

In this work, we have explored the feasibility of alveolar open-cell beta-SiC foams as catalyst support for solar hydrogen production. For that purpose, Pt and Ru nanoparticles have been obtained, by means of photoassisted synthesis, on TiO2-coated foams and tested in gas-phase hydrogen production from water-ethanol mixtures in a tubular reactor coupled to a compound parabolic solar collector (CPC). Subnanometre-sized metal or metal/ oxide nanoparticles are obtained for Pt/TiO2/SiC and Ru/TiO2/SiC foams, respectively, where co-catalyst nanoparticles decorate the TiO2 coating which in [read more]

Dynamics of Pd Subsurface Hydride Formation and Their Impact on the Selectivity Control for Selective Butadiene Hydrogenation Reaction

Autores: Asedegbega-Nieto, E; Iglesias-Juez, A; Di Michiel, M; Fernandez-Garcia, M; Rodriguez-Ramos, I; Guerrero-Ruiz, A

Nanomaterials. vol: 13. page: .
Fecha: MAR. 2023.
Doi: 10.3390/nano13061099.

Structure-sensitive catalyzed reactions can be influenced by a number of parameters. So far, it has been established that the formation of Pd-C species is responsible for the behavior of Pd nanoparticles employed as catalysts in a butadiene partial hydrogenation reaction. In this study, we introduce some experimental evidence indicating that subsurface Pd hydride species are governing the reactivity of this reaction. In particular, we detect that the extent of formation/decomposition of PdHx species is very sensitive to the Pd nanoparticle [read more]

Selective Fragmentation of Lignocellulosic Biomass with ZnCl2 center dot 4H(2)O Using a Dissolution/Precipitation Method

Autores: Lara-Serrano, M; Sboiu, DM; Morales-delaRosa, S; Campos-Martin, JM

Appl. Sci.-Basel. vol: 13. page: .
Fecha: MAR. 2023.
Doi: 10.3390/app13052953.

Lignocellulosic biomass dissolution in an inorganic salt hydrate (ZnCl2 center dot 4H(2)O) and its subsequent precipitation with water for the separation of its main compounds were investigated. For this purpose, different dissolution times and temperatures were studied, where 24 h and 70 degrees C were found to be the optimal choice. Three solids were obtained, which were analyzed and identified by XRD, SEM, NMR, and FTIR spectroscopy. Solid I is the undissolved part of the starting material, and it consists of lignin, which does [read more]

Photobio-electrocatalytic production of H2 using fluorine-doped tin oxide (FTO) electrodes covered with a NiO-In2S3 p-n junction and NiFeSe hydrogenase

Autores: Luna-Lopez, G; del Barrio, M; Fize, J; Artero, V; Coito, AM; Pereira, IAC; Conesa, JC; Iglesias-Juez, A; De Lacey, AL; Pita, M

Bioelectrochemistry. vol: 150. page: 1567-5394.
Fecha: APR. 2023.
Doi: 10.1016/j.bioelechem.2022.108361.

Clean energy vectors are needed towards a fossil fuel-free society, diminishing both greenhouse effect and pollution. Electrochemical water splitting is a clean route to obtain green hydrogen, the cleanest fuel; although efficient electrocatalysts are required to avoid high overpotentials in this process. The combination of inorganic semiconductors with biocatalysts for photoelectrochemical H2 production is an alternative approach to overcome this challenge. N-type semiconductors can be coupled to a co-catalyst for H2 [read more]

Unspecific peroxygenases: The pot of gold at the end of the rainbow?

Autores: Monterrey, DT; Menes-Rubio, A; Keser, M; Gonzalez-Perez, D; Alcalde, M

Curr. Opin. Green Sustain. Chem.. vol: 41. page: 2452-2236.
Fecha: JUN. 2023.
Doi: 10.1016/j.cogsc.2023.100786.

Fungal unspecific peroxygenases (UPOs) are among the most promising biocatalysts in synthetic chemistry. The kaleido-scope of oxyfunctionalization reactions that are of industrial and environmental relevance offer UPOs the opportunity to provide solutions to many processes. However, there are important shortcomings that must first be overcome in order to convert UPOs into applied biocatalysts, which include their general poor levels of heterologous functional expression, the presence of unwanted peroxidase activity and overoxidation reactions, as well as the oxidative inactivation provoked [read more]

Bimetallic metal-organic frameworks for efficient visible-light-driven photocatalytic CO2 reduction and H2 generation

Autores: Ezugwu, CI; Ghosh, S; Bera, S; Faraldos, M; Mosquera, MEG; Rosal, R

Sep. Purif. Technol.. vol: 308. page: 1383-5866.
Fecha: mar-01. 2023.
Doi: 10.1016/j.seppur.2022.122868.

A series of robust octahedral bimetallic metal-organic frameworks, NH2-UiO-66(Zr/M), denoted as Zr/M-ATA, (where M is Fe, Co, or Cu) were prepared by solvothermal de novo reaction of 2-aminoterephthalic acid (denoted as H2ATA) and mixed metal salts using benzoic acid as a modulator. Photocatalytic studies revealed that Zr/Fe-ATA, Zr/Cu-ATA and Zr/Co-ATA containing double metals outperformed that of the monometallic Zr-ATA. Zr/Cu-ATA displayed excellent performance for visible-light-driven CO2 reduction with a formate forma-tion rate of 122 mu mol h-1 mmolMOF-1 , [read more]

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Electrochemically assisted photocatalytic degradation of contaminants of emerging concern in simulated wastewater using WO3-Elucidation of mechanisms

Autores: Tolosana-Moranchel, A; McMichael, S; Hamilton, JWJ; Byrne, JA; Fernandez-Ibanez, P

Chem. Eng. J.. vol: 458. page: 1385-8947.
Fecha: feb-15. 2023.
Doi: 10.1016/j.cej.2023.141442.

In this work, the performance of a photoelectrochemical cell to degrade a mixture of contaminants of emerging concern (CECs) in distilled water and simulated wastewater effluents (SWWE) was assessed. The CECs mixture included trimethoprim (TMP), diclofenac (DFC), sulfamethoxazole (SMX) and carbamazepine (CBZ) (100 mu g.L- 1 each). WO3 nanoplate-like structures synthesized on fluorine tin oxide coated glass (FTO) were used as the photoanode with Pt or carbon gas diffusion electrodes (GDE) as the counter electrode. The most efficient degradation of the [read more]


mayo 2023
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