Listar QICM - Contribuciones a congresos científicos por título
Mostrando ítems 187-206 de 216
-
Técnicas de caracterización avanzadas para el estudio de pastas de cementos.
(2024)Los cementos son materiales multifásicos, así que es necesario la utilización de diferentes técnicas analíticas para comprender las reacciones de hidratación que se producen. La química de hidratación de los cementos es ... -
The effect of mechanochemistry on the preparation of heterogeneous catalysts: Reduction of furfural to obtain furfuryl alcohol.
(2023)In this context, mechanochemistry is receiving increasing attention for the synthesis of many chemical compounds in the solid state, considered by IUPAC as one of the 10 methodologies to change the world.Mechanochemistry ... -
The use of mo and cu monochromatic radiations for quantitative phase analysis: study of the accuracy
(2016-06-27)Cement hydration is a very complex process in which crystalline phases are dissolving in water and after supersaturation hydrated crystalline and amorphous phases precipitate. Great efforts are being made to develop ... -
Time-dependent monitoring of cement hydration by combined laboratory x-ray microtomography and powder diffraction
(2022-06-30)Following the reaction degree of amorphous phases in cements is very challenging. It becomes even harder when some additions (supplementary cementitious materials) are employed. Nowadays, calcined clays are attracting a ... -
Transformaciones microtexturales de esmectita a illita, en presencia de amonio
(Macla, 2022)Durante la diagénesis se producen reacciones que afectan a los filosilicatos y a la materia orgánica, que lleva a la fijación de NH4 en las illitas (Ill) y en las micas. Además, las esmectitas (Sm) sufren reorganizaciones ... -
Transition metal hydroxyphosphonoacetates as precursors of electrocatalysts
(2021-01-29)Coordination polymers (PCs) are widely studied due to their applicability in many fields. Among them, metal phosphonates are attractive materials due to their great structural and functional diversity, as proton conductors ... -
Tunable crystal structure and proton conductivity of lanthanide nitrilotrismethylphosphonates
(2018-10-01)Metal phosphonates are multifunctional solids with remarkable stability and proton conducting properties owing to their structure is usually composed of extended hydrogen-bond networks that favor proton transfer pathways ... -
Tunable electrode architectures for La0.8Sr0.2Fe1-xTixO3-δ based Symmetrical Solid Oxide Fuel Cells.
(2021-07-18)The efficiency of SOCF electrodes can be improved by optimizing the microstructure from alternative preparation methods, such as infiltration and nanostructured electrodes deposited at low temperature. ... -
Tuning Proton Conductivity in A Multifunctional Calcium Phosphonate Hybrid Framework
(2014-06-25)Multi-chelating phosphonate ligands are organic linkers alternative to polycarboxylates and other ligands providing synthetic access to a number of thermally- and chemically-stable MOFs [1]. Metal phosphonates are amenable ... -
Tuning Proton Conductivity Properties of Lanthanide Amino-Sulfophosphonates-Loaded Nafion Composite Membranes
(2017-07-05)Polymer-based electrolytes in proton exchange membrane fuel cells (PEMFCs) utilize acidic groups as proton carriers and hydrogen bonding networks as proton-conducting pathways to facilitate proton transport. Crystalline ... -
Tuning the activity of cobalt 2-hydroxyphosphonoacetates-derived electrocatalyst for water splitting and oxygen reduction: insights into the local order by pair distribution funcion analysis
(2024-01-16)Electrode materials generally exhibit complex heterostructures wherein both amorphous and crystalline phases may coexist [1]. Advanced techniques, such as Pair Distribution Function (PDF) analysis, may offer valuable ... -
Using transition metal tetraphosphonates as precursor of phosphorus-containing electrocatalysts
(2022-11)Coordination polymers (CPs) are widely studied due to their applicability in many fields. Among them, metal phosphonates (MPs) are attractive materials due to their versatile structural diversity and functionality, with ... -
Uso conjunto de difracción de rayos X de polvo y microtomografía de laboratorio en la hidratación del cemento Portland.
(2024)Para estudiar la hidratación de los cementos de manera precisa y robusta, estamos desarrollando un enfoque innovador basado en medidas in situ de pastas, evitando así cualquier alteración de las mismas. Utilizamos la ... -
Valorisation of glucose into biofuels and high value-added chemicals using zeolites as catalysts.
(2023)Hexose sugars can be valorised under acidic conditions to produce the platform chemical 5-hydroxymethylfurfural (HMF), which can be transformed in a broad spectrum of chemicals with applications as biofuels or monomers for ... -
Valorisation of glycerol by new mechanochemical processes
(2019-05-22)The search for new applications of glycerol, as a chemical platform from which a broad spectrum of new valuable derivatives can be obtained, is ongoing. In the present communication, a new mechano-chemical reactor is used ... -
Valorización de furfural en reacción one-pot utilizando Al- y Zr-PILCs como catalizadores
(2023)El agotamiento de los combustibles fósiles ha dado lugar a la búsqueda y desarrollo de nuevas fuentes de energía y productos químicos. En este sentido, la biomasa lignocelulósica ha surgido como interesante alternativa ... -
Valorización de furfural hacia productos de alto valor añadido con arcillas pilareadas con ZrO2 o Al2O3.
(2023)El agotamiento de los combustibles fósiles ha dado lugar a la búsqueda y desarrollo de nuevas fuentes de energía y productos químicos. De las potenciales fuentes, la biomasa lignocelulósica se ha perfilado como una alternativa ... -
Valorización de huesos de aceituna para la obtención de furfural en presencia de gamma- Al2O3 y CaCl2
(2019-07-02)En la actualidad, se considera que la biomasa lignocelulósica es una materia prima sostenible muy prometedora, ya que es la única fuente de carbono renovable que no compite con la cadena alimentaria. A partir de ella puede ... -
Valorización de la borra del café: producción de biodiesel y 5-hidroximetilfurfural/furfural
(2022)VALORIZACIÓN DE LA BORRA DEL CAFÉ: PRODUCCIÓN DE BIODIESEL Y 5-HIDROXIMETILFURFURAL/FURFURAL -
Valorization of carbohydrates: dehydration of sorbitol to isosorbide in the presence of acidic zeolites
(2015-10-16)Currently, the growing interest in the use of biomass as a renewable and sustainable raw material for the production of energy, chemicals and biofuels is driving the development of new catalytic processes and technologies ...