Results 51 to 60 of about 6,762 (164)

Pd Nanoparticles Supported on Activated Carbon and Their Application in the Oxidative Condensation Reaction of Furfural: Effect of Base and Oxidizing Agent on Catalytic Behavior and Deactivation

open access: yesChemCatChem, Volume 17, Issue 17, September 5, 2025.
Catalysts with varying palladium (Pd) loading supported on activated carbon were assessed for their effectiveness in the oxidative condensation of furfural. Furan‐2‐acrolein was the primary product, depending on the palladium content. Reusability tests showed a decline in the yield of furan‐2‐acrolein.
Rocío Maderuelo Solera   +6 more
wiley   +1 more source

Mineralogía, geoquímica y evolución diagenética de los materiales carbonatados del área de Mérida (Badajoz)

open access: yesEstudios Geologicos, 1996
En el área de Mérida aflora una serie carbonatada, atribuida al Cámbrico inferior, compuesta por calizas carbonosas con intercalaciones de niveles y nódulos de chert, en su tramo inferior, y una secuencia predominantemente dolomítica en el superior.
J. C. Fernández Caliani   +2 more
doaj   +1 more source

Synthesis of Au-Cu/SBA(Ti) catalysts for photocatalytic applications [PDF]

open access: yes, 2018
In this work, it has been synthesized several Au and Au-Cu alloy photocatalysts supported on two different mesoporous supports: a non-commercial SBA-15 and a post-synthesis TiO2 modified SBA-15 (TiSBA-15), with which a high dispersion of TiO2 species ...
Barroso Martín, Isabel
core  

Enhanced Oxygen Evolution Reaction Performance of Niobium–Cobalt Oxide Catalysts in Acidic and Alkaline Media

open access: yesAdvanced Sustainable Systems, Volume 9, Issue 8, August 2025.
The electronic modulation of Nb‐doped Co3O4 catalyst showcases enhanced activity and extended stability for OER in both alkaline (1M KOH) and acidic (0.5M H2SO4) electrolytes. The higher activity emanated from the synergistic effect between the Nb5+ dopant and Co3O4.
Kassa Belay Ibrahim   +7 more
wiley   +1 more source

Clinkering and early age hydration characterization of Belite-Alite Calcium Sulfoaluminate (BACSA) cements [PDF]

open access: yes, 2015
In this work, four BACSA clinkers with different compositions (belite ~ 70-55 wt %, alite ~ 10-15 wt % and ye’elimite ~ 10-15 wt %) were synthesized (at laboratory scale).
García-Aranda, Miguel Ángel   +5 more
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Managing climate change impacts on crops: The influence of soil tillage on a triticale crop under water stress conditions

open access: yesAnnals of Applied Biology, Volume 186, Issue 2, Page 143-156, March 2025.
Climate change and the impact of water limitations on rainfed crops are a major concern in Mediterranean countries. Conservation agriculture promotes less aggressive tillage systems, including reduced tillage (RT) and no tillage (NT), that confer agrosystems a higher stability against environmental changes compared to the traditional tillage (TT ...
Paula Madejón   +4 more
wiley   +1 more source

Las pizarras de la faja piritica Ibérica (zona sur-Portuguesa): geología, mineralogía y aplicaciones industriales

open access: yesEstudios Geologicos, 1991
Se describen las características geoquímicas, mineralógicas y petrográficas de los materiales pizarrosos de un sector de la Faja Pirítica y, en base a estos datos, se discuten sus condiciones de formación y evolución durante el metamorfismo.
J. C. Fernández-Caliani, E. Galán
doaj   +1 more source

Structural study of the local order in ammonia-modulated FE(II) hydroxyphosphonoacetate proton conductors [PDF]

open access: yes, 2017
Layered Fe(II) carboxiphosphonate, Fe-HPAA·2H2O, is a crystalline multifunctional coordination polymer exhibiting properties as photocatalyst and proton conductor.
Bazaga-García, Montse   +5 more
core  

MODELAMIENTO DE LA ESTRUCTURA DEL ALUMINIO LIQUIDO MEDIANTE EL METODO DE DINAMICA MOLECULAR

open access: yesRevista de Investigación de Física, 2000
Usamos el método de Dinámica Molecular (DM) para obtener una descripción atomística de los procesos de difusión y estructura del aluminio líquido en un ámplio rango de temperaturas (900K - 2600K).
Justo A. Rojas Tapia   +2 more
doaj   +1 more source

An efficient and sustainable biodiesel production in a mechanochemical pilot reactor under heterogeneous catalysis [PDF]

open access: yes, 2018
Fatty acid methyl esters (FAME) produced from vegetable oils or animal fats by transesterification, or from the esterification of fatty acids, with methanol, is labeled as ‘‘Biodiesel”.
Halloumi, Samy   +5 more
core  

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