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Introduction
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Publications
Publications (25)
Tri-lithium borate (Li3BO3) is a high-capacity CO2 sorbent recently proposed for the intermediate temperature range of 500 to 650 °C. Up to date, only a study of CO2 sorption kinetic behavior of Li3BO3 modified by nitrite salts has been carried out. The equilibrium properties that relate the dependence of the partial pressure of CO2 and temperature...
Thermally-driven structural changes of Na 2 TiO 3 and their effect on its carbonation behaviour.
Wet mechanochemical processing of olivine under a CO2 atmosphere promotes the CO2 sequestration in the form of MgCO3 and the CO2 reduction to CH4 at room temperature. The effects of milling time and CO2 pressure on the CO2 storage and CO2 reduction were evaluated at lab-scale. Wet mechanochemical introduces progressively significant morphological,...
The reutilization of CO 2 to produce valuable chemical fuels is an attractive approach to reduce the greenhouse effect and global warming. In this work, the room temperature production of CH 4 /H 2 fuel mixtures via me-chanochemical activation of Li 2 CO 3-MgH 2 system was explored. The CH 4 /H 2 fuel mixtures were obtained by a free-catalyst react...
The feasibility of the reduction of CO2 to CH4 employing MgH2 in the presence and absence of cobalt as catalyst was investigated for the first time, exploring different non-independent reaction conditions such as the grade of microstructural refinement, the molar ratio MgH2:CO2, reaction time and temperature. For the un-catalyzed process a methane...
2LiH + MgB2 composite doped with TiO2 (Li-RHC-Ti) is employed with a two-fold purpose: hydrogen purification under a H2–CO (0.1 mol%) mixture and CO methanation. Upon dynamic cycling under CO–H2 mixture, hydrogen release curves display a quite stable amount of pure hydrogen of about 10 wt%, short release times of around 60 min, and minor degradatio...
CO2 capture and conversion is a key research field for the transition towards an economy only based on renewable energy sources. In this regard, hydride materials are a potential option for CO2 methanation since they can provide hydrogen and act as a catalytic species. In this work, Mg2NiH4 complex hydride is synthesized by in situ monitoring mecha...
Hydrogen technology has become essential to fulfill our mobile and stationary energy needs in a global low–carbon energy system. The non-renewability of fossil fuels and the increasing environmental problems caused by our fossil fuel–running economy have led to our efforts towards the application of hydrogen as an energy vector. However, the develo...
We present the decoration of N-doped graphene entangled in mesoporous carbon by nickel and/or cobalt nanoparticles. The textural properties of the mesoporous materials were characterized by nitrogen desorption isotherms. The materials presented metallic nanoparticles of at least 20 nm and diffraction peaks typical of cubic cobalt or nickel. Transmi...
A study on the mechanochemical activation of the olivine in presence of H2O and under CO2 atmosphere have been approached, focusing both on the structural nature of the transformation and the conversion of CO2 to methane and light hydrocarbons. The mechanochemical process was carried out by high energy laboratory mills, with milling vials properly...
CO2 emissions have been continuously increasing during the last half century with a relevant impact on the planet, being the main contributors of the greenhouse effect and global warming. The development of new technologies to mitigate these emissions poses a challenge. Herein, it is demonstrated the recycling of CO2 to produce CH4 selectively by u...
N-doped graphene hydrogels were prepared by crosslinking graphene oxide with ethylenediamine. These materials presented 10 at. % nitrogen, as determined by X-ray photoelectron spectroscopy. N-doped graphene was entangled within mesoporous matrices by diffusion of resorcinol-formaldehyde solutions throughout the hydrogels. According to nitrogen deso...
Mg2FeH6 is regarded as potential hydrogen and thermochemical storage medium due to its high volumetric hydrogen (150 kg/m3) and energy (0.49 kWh/L) densities. In this work, the mechanism of formation of Mg 2 FeH 6 under equilibrium conditions is thoroughly investigated applying volumetric measurements, X-ray diffraction (XRD), X-ray absorption near...
The use of hydrogen as an energy vector presents different challenges for the scientific community, including the development of cost-effective, lasting, and safe hydrogen energy storage systems. Solid-state hydrogen storage as hydride compounds provides a prominent method regarding efficiency and safety. Transition complex hydrides such as Mg2CoH5...
Carbon capture and storage using regenerable sorbents is an effective approach to reduce the CO2 emissions from stationary sources. In this work, lithium orthosilicate (Li4SiO4) was studied as carbon dioxide sorbent. For deeper understanding of the synthesis and carbonation mechanism of Li4SiO4, in situ synchrotron radiation powder X-ray diffractio...
The safest way to store hydrogen is in solid form, physically entrapped in molecular form in highly porous materials, or chemically bound in atomic form in hydrides. Among the different families of these compounds, alkaline and alkaline earth metals alumino-hydrides (alanates) have been regarded as promising storing media and have been extensively...
Recent investigations showed the formation of new amide-chloride phases between LiNH2 and AlCl3 after milling and/or heating under hydrogen pressure. These phases exhibited a key role in the improvement of the hydrogen storage properties of the LiNH2-LiH composite. In the present work, we studied the effects of Al and AlCl3 additives on the hydroge...
The existence and stability of Mg2Co and MgCo is still a controversial issue. Even though none of these compounds are included in the last assessed Mg–Co phase diagrams, some authors have claimed their existence. In this paper we propose that only one compound with more than 40at.% Mg exists, and determine its composition, formation and stability u...
The effect of solid Fe2O3 and gaseous iron chlorides on the anatase-rutile phase transition was investigated in the temperature range of 750°-950°C via X-ray diffractometry and scanning electron microscopy. In both cases, iron diffusion in the anatase lattice decreased the transition temperature and increased the anatase-rutile transformation rate,...
MgAl2O4 spinel was successfully synthesized using a mechanochemical route that avoided the formation and calcination of its precursors at high temperatures. The method involved a single step in which gamma-Al2O3-MgO, AlO(OH)-MgO, and alpha-Al2O3-MgO mixtures were milled at room temperature under air atmosphere. The formation of MgAl2O4 occurred fas...
Projects
Project (1)
We will study the effects of nanoconfinement over the capacity of hydrides for hydrogen release/capture. We will diversify the carbon matrix by doping it with graphene, metal nanoparticules and heteroatoms. Our objective is to lower the liberation temperature of H2, improve the reversibility of the material, while maintaining a useful energy/weight ratio.
