Results 51 to 60 of about 23,238 (164)

Estudio de la dinámica sedimentaria de la Laguna costera del Sur de Túnez (Túnez, Mar Mediterráneo)

open access: yesEstudios Geologicos, 2019
La laguna sur de Túnez, una laguna costera mediterránea poco profunda, se sometió a importantes trabajos de restauración durante el período 1998-2001, lo que ha llevado a cambios estructurales y funcionales de este ecosistema costero.
M. Abidi, R. Ben Amor, M. Gueddari
doaj   +1 more source

Modulation of the Acidity of HY, HBETA, and HZSM‐5 Zeolites by Lanthanum Incorporation for Selective Gasoline Desulfurization in the FCC Riser

open access: yesChemCatChem, Volume 17, Issue 21, November 10, 2025.
Desulfurization in the FCC riser is achieved by modifying zeolite catalysts with La3+ ions, promoting H2S formation from thiophenic compounds while suppressing secondary reactions. This approach enhances gasoline quality by increasing selectivity for H2S and enabling efficient condensation and alkylation, supporting cleaner fuel production and ...
Ronaldo C. Santos   +8 more
wiley   +1 more source

Diagenetic paths in a low subsident Triassic Basin: NW zone of Iberian Range Spain. [PDF]

open access: yes, 2002
Depto. de Mineralogía y PetrologíaFac.
Arribas Mocoroa, José, Ochoa, M.
core  

Las turmalinitas estratiformes ordovicicas de Latedo en el flanco S del sinforme de Alcañices (Zamora)

open access: yesEstudios Geologicos, 1992
En este trabajo se realiza un estudio geológico, mineralógico y químico del nivel de turmalinitas interestratificado en los materiales volcanosedimentarios de la Formación Cabeza de las Viñas, de edad Ordovícico Inferior, en el flanco S del Sinforme de ...
A. Fernández Fernández   +1 more
doaj   +1 more source

Optimized bifunctional CuNiMgAl catalysts for efficient synthesis of the renewable bioproduct glycerol carbonate

open access: yesBiofuels, Bioproducts and Biorefining, Volume 19, Issue 5, Page 1271-1288, September/October 2025.
Abstract This paper presents a novel technology for converting glycerol, a byproduct of the biodiesel industry, into glycerol carbonate, a high‐value bioproduct. The effect of calcination temperature on the synthesis of quaternary Cu‐Ni‐Mg‐Al catalysts (MMO‐Cu15Ni15‐Tz) and their application in the transesterification reaction was investigated ...
Dalma S. Argüello   +5 more
wiley   +1 more source

Caracterización y procedencia de las areniscas del Paleógeno del sector Norte de la cuenca del Tajo [PDF]

open access: yes, 1986
Depto. de Mineralogía y PetrologíaFac.
Arribas Mocoroa, José   +1 more
core  

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

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  

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

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