Study of the first step of the Mn2O3/MnO thermochemical cycle for solar hydrogen production

Marugán, Javier; Botas, Juan A.; Martín, Mariana; Molina, R.; Herradon, Carolina

doi:10.1016/j.ijhydene.2011.10.124

Cited by 42 publications

(27 citation statements)

References 27 publications

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“…Consequently the kinetic parameters calculated for reaction (R5) should only be considered for conversion values below 55%, and extrapolation to higher conversions and temperatures should previously validated by additional experimental data. In any case, this work confirms that the first step of the Mn 2 O 3 /MnO thermochemical cycle can be carried out at much lower temperatures that the theoretical temperatures estimated from the thermodynamic equilibrium [23] and that the kinetics of the process allow it to be conducted at reasonable values of the reaction rate.…”

Section: Determination Of the Best Kinetic Model And Calculation Of Tsupporting

confidence: 76%

Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production

Botas

Marugán

Molina

et al. 2012

International Journal of Hydrogen Energy

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Section: Determination Of the Best Kinetic Model And Calculation Of Tsupporting

confidence: 76%

Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production

Botas

Marugán

Molina

et al. 2012

International Journal of Hydrogen Energy

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“…The transition occurring at lower temperature (MnO2/Mn2O3) did not exhibit redox reversibility as it has been experimentally confirmed 189 . The decomposition from Mn2O3 to MnO has been widely studied for H2 production as it is one of the processes involved in the Mn-Nabased 3-step thermochemical cycle [190][191][192][193][194] . Researchers from ANU have proposed the use of such Mn2O3/MnO redox cycle also for TCS purpose 195 .…”

Section: Figure 18mentioning

confidence: 99%

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

et al. 2019

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Among renewable energies, wind and solar are inherently intermittent and therefore both require efficient energy storage systems to facilitate a round-the-clock electricity production at global scale. In this context, concentrated solar power (CSP) stands out among other sustainable technologies because it offers the interesting possibility of storing energy collected from the sun as heat, by sensible, latent or thermochemical means. Accordingly, continuous electricity generation in the power block is possible even during off-sun periods, providing CSP plants with a remarkable dispatchability. Sensible heat storage has been already incorporated to commercial CSP plants. However, due to its potentially higher energy storage density, thermochemical heat storage (TCS) systems emerge as an attractive alternative for the design of next generation power plants, which are expected to operate at higher temperatures. Through these systems, thermal energy is used to drive endothermic chemical reactions, which can subsequently release the stored energy when needed through a reversible exothermic step. This review analyzes the status 2 of this prominent energy storage technology, its major challenges and future perspectives, covering in detail the numerous strategies proposed for the improvement of materials and thermochemical reactors. Thermodynamic calculations allow selecting high energy density systems, but experimental findings indicate that sufficiently rapid kinetics and long-term stability trough continuous cycles of chemical transformation are also necessary for practical implementation. In addition, selecting easy to handle materials with reduced cost and limited toxicity is crucial for large-scale deployment of this technology. In this work, the possible utilization of materials as diverse as metal hydrides, hydroxides or carbonates for thermochemical storage is discussed. Furthermore, especial attention is paid to the development of redox metal oxides, such as Co3O4/CoO, Mn2O3/Mn3O4 and perovskites of different compositions, as an auspicious new class of TCS materials due to the advantage of working with atmospheric air as reactant, avoiding the need of gas storage tanks. Current knowledge about the structural, morphological and chemical modifications of these solids, either caused during redox transformations, or induced wittingly as a way to improve their properties, is revised in detail. In addition, the design of new reactors concepts proposed for the most efficient use of TCS in concentrated solar facilities is also critically considered. Finally, strategies for the harmonic integration of these units in functioning solar power plants, as well as the economic aspects are also briefly assessed.

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“…In general, two‐step water splitting cycles rely on the reduction and subsequent reoxidation of metal oxides and require reduction temperatures >1000°C, but much lower than 2000°C . Multistep (more than two steps) cycles commonly utilize a metal in conjunction with harsh acids or bases, and often include an electrolysis step; many of these cycles operate at a maximum temperature below 900°C . Because of the hazardous chemicals, design complications, and the compounding inefficiencies associated with the numerous process steps, multistep cycles are unlikely to achieve the high efficiencies required for economical H 2 generation .…”

Section: Overview Of Solar Thermal Water Splittingmentioning

confidence: 99%

A review and perspective of efficient hydrogen generation via solar thermal water splitting

Muhich

Ehrhart

Al‐Shankiti

et al. 2015

WIREs Energy & Environment

195

160

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Solar thermal water splitting (STWS) produces renewable hydrogen from water using concentrated sunlight. Because it utilizes energy from the entire solar spectrum to directly drive the redox reactions that split water, it can achieve high theoretical solar-to-hydrogen efficiencies. In two-step STWS, a metal oxide is first heated by concentrated sunlight to high temperatures to reduce it and produce O 2 . In the second step, the reduced material is exposed to H 2 O to reoxidize it to its original oxidation state and produce H 2 . Various aspects of this process are reviewed in this work, including the reduction and oxidation chemistries of the active redox materials, the effects of operating conditions, and the solar thermal reactors in which the STWS reactions occur, and a perspective is given on the future optimization of STWS.

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Study of the first step of the Mn2O3/MnO thermochemical cycle for solar hydrogen production

Cited by 42 publications

References 27 publications

Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production

Kinetic modelling of the first step of Mn2O3/MnO thermochemical cycle for solar hydrogen production

Solar Energy on Demand: A Review on High Temperature Thermochemical Heat Storage Systems and Materials

A review and perspective of efficient hydrogen generation via solar thermal water splitting

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