Synthesis of new ferrite, Al–Cu ferrite, and its oxygen deficiency for solar H2 generation from H2O

Kaneko, Hiroshi; Yokoyama, Toshiro; Fuse, Akinori; Ishihara, Hideyuki; Hasegawa, Noriko; Tamaura, Yutaka

doi:10.1016/j.ijhydene.2006.03.008

Cited by 33 publications

(12 citation statements)

References 15 publications

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“…The partial substitution of iron by nickel [115], manganese [95], cobalt [114], aluminum-copper [113] or zinc [103][104][105][106][107][108][109][110][111] in the Fe3O4 spinel structure forms mixed iron oxides of general formula (Fe1−xMx)3O4. This ferrite can be reduced at much lower temperatures than those required for Fe3O4 Regarding other metal-oxide redox systems, most of them are not feasible practically because they require a too much elevated temperature during the solar reduction step (∆G • < 0 for T > 2200 • C in the case of MoO 2 /Mo, SnO 2 /Sn, TiO 2 /TiO 2−x , MgO/Mg, or CaO/Ca redox pairs).…”

Section: Non-volatile Metal Oxide Cyclesmentioning

confidence: 99%

Metal Oxides Applied to Thermochemical Water-Splitting for Hydrogen Production Using Concentrated Solar Energy

Abanades

2019

ChemEngineering

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Solar thermochemical processes have the potential to efficiently convert high-temperature solar heat into storable and transportable chemical fuels such as hydrogen. In such processes, the thermal energy required for the endothermic reaction is supplied by concentrated solar energy and the hydrogen production routes differ as a function of the feedstock resource. While hydrogen production should still rely on carbonaceous feedstocks in a transition period, thermochemical water-splitting using metal oxide redox reactions is considered to date as one of the most attractive methods in the long-term to produce renewable H2 for direct use in fuel cells or further conversion to synthetic liquid hydrocarbon fuels. The two-step redox cycles generally consist of the endothermic solar thermal reduction of a metal oxide releasing oxygen with concentrated solar energy used as the high-temperature heat source for providing reaction enthalpy; and the exothermic oxidation of the reduced oxide with H2O to generate H2. This approach requires the development of redox-active and thermally-stable oxide materials able to split water with both high fuel productivities and chemical conversion rates. The main relevant two-step metal oxide systems are commonly based on volatile (ZnO/Zn, SnO2/SnO) and non-volatile redox pairs (Fe3O4/FeO, ferrites, CeO2/CeO2−, perovskites). These promising hydrogen production cycles are described by providing an overview of the best performing redox systems, with special focus on their capabilities to produce solar hydrogen with high yields, rapid reaction rates, and thermochemical performance stability, and on the solar reactor technologies developed to operate the solid–gas reaction systems.

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Section: Non-volatile Metal Oxide Cyclesmentioning

confidence: 99%

Metal Oxides Applied to Thermochemical Water-Splitting for Hydrogen Production Using Concentrated Solar Energy

Abanades

2019

ChemEngineering

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“…The second reaction is the exothermic step, during which the reduced oxide is newly oxidized, forming H 2 and regenerating the original oxide. Materials that have been considered for application in the thermochemical production of hydrogen include Fe [63][64][65][66][67][68][69], Ce [70][71][72][73], Zn [74][75][76][77][78][79][80][81][82][83][84][85][86], Ti [87], Mn [65,68,88], Co [68], and Sn [83,84,89,90] oxides, as well as ferrites [91][92][93]. These cycles generally operate between the lower temperature of the oxidation step and the higher temperature of the reduction step.…”

Section: Reactor/receivers For Water-splitting Redox Cyclesmentioning

confidence: 99%

Methodologies for the Design of Solar Receiver/Reactors for Thermochemical Hydrogen Production

Murmura

Annesini

2020

Processes

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Thermochemical hydrogen production is of great interest due to the potential for significantly reducing the dependence on fossil fuels as energy carriers. In a solar plant, the solar receiver is the unit in which solar energy is absorbed by a fluid and/or solid particles and converted into thermal energy. When the solar energy is used to drive a reaction, the receiver is also a reactor. The wide variety of thermochemical processes, and therefore of operating conditions, along with the technical requirements of coupling the receiver with the concentrating system have led to the development of numerous reactor configurations. The scope of this work is to identify general guidelines for the design of solar reactors/receivers. To do so, an overview is initially presented of solar receiver/reactor designs proposed in the literature for different applications. The main challenges of modeling these systems are then outlined. Finally, selected examples are discussed in greater detail to highlight the methodology through which the design of solar reactors can be optimized. It is found that the parameters most commonly employed to describe the performance of such a reactor are (i) energy conversion efficiency, (ii) energy losses associated with process irreversibilities, and (iii) thermo-mechanical stresses. The general choice of reactor design depends mainly on the type of reaction. The optimization procedure can then be carried out by acting on (i) the receiver shape and dimensions, (ii) the mode of reactant feed, and (iii) the particle morphology, in the case of solid reactants.

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“…The rationale is to exploit the redox effect of iron oxides in conjunction with the thermal stability of aluminum oxides. For instance, Al-Cu ferrites with various Cu/Al/Fe cation ratios have been synthesized and tested [140]; it was reported that such systems exhibited lower TR temperatures than …”

Section: The Hercynite Cyclementioning

confidence: 99%

A review on solar thermal syngas production via redox pair-based water/carbon dioxide splitting thermochemical cycles

Agrafiotis

Roeb

Sattler

2015

Renewable and Sustainable Energy Reviews

339

151

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Synthesis of new ferrite, Al–Cu ferrite, and its oxygen deficiency for solar H2 generation from H2O

Cited by 33 publications

References 15 publications

Metal Oxides Applied to Thermochemical Water-Splitting for Hydrogen Production Using Concentrated Solar Energy

Metal Oxides Applied to Thermochemical Water-Splitting for Hydrogen Production Using Concentrated Solar Energy

Methodologies for the Design of Solar Receiver/Reactors for Thermochemical Hydrogen Production

A review on solar thermal syngas production via redox pair-based water/carbon dioxide splitting thermochemical cycles

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