Water splitting with the Mn(II)-ferrite–CaO–H2O system at 1273K

Tamaura, Yutaka; Hasegawa, Noriko; Kojima, M.; Ueda, Y.; Amano, Hiroki; Tsuji, Masamichi

doi:10.1016/s0360-5442(98)00030-9

Cited by 14 publications

(6 citation statements)

References 23 publications

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“…Similar observations were also made when the H 2 generation ability of SF-1 and SF-2 was compared with the doped ferrites such as Ni-Mn-ferrite 19 and Ni-Zn-ferrite. 7 Contrasting to this, SF-2 material was found to be capable of producing higher volumes of H 2 as compared with the commercially available Zn-ferrite from Sigma Aldrich.…”

Section: -7supporting

confidence: 74%

“…2 Several metal oxides, for instance, phase pure ferrites such as Ni-ferrite, [3][4][5][6][7][8][9][10][11][12][13] Zn-ferrite, [14][15][16][17][18] Mn-ferrite, 3,[19][20][21][22] Co-ferrite, 23,24 and doped ferrites such as Ni-Mn-ferrite 3,13,19,[25][26][27] and Ni-Znferrite 7,28,29 were investigated for thermochemical water-splitting process. For instance, Fresno et al 7 reported generation of 1.35 ml H 2 g À1 cycle À1 using Zn-ferrite (Sigma Aldrich) at watersplitting and regeneration temperatures of 1000 C and 1300 C, respectively.…”

Section: Introductionmentioning

confidence: 99%

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H2 generation from two-step thermochemical water-splitting reaction using sol-gel derived SnxFeyOz

Bhosale

Khadka

Puszynski

et al. 2011

Journal of Renewable and Sustainable Energy

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H 2 has a great potential to replace fossil fuels and contribute to clean energy by reducing the environmental carbon foot-print. This study reports H 2 generation from a thermochemical water-splitting reaction using sol-gel derived Sn x Fe y O z powders. The sol-gel synthesis involved the addition of SnCl 2 Á 2H 2 O and FeCl 2 Á 4H 2 O in ethanol followed by gelation using propylene oxide. As-synthesized gels were aged, dried, and heated rapidly upto different temperatures and quenched in air or N 2 environment. The calcined powders were characterized using powder x-ray diffraction, BET surface area analyzer, and scanning electron microscopy (SEM). Calcination temperature and environment were found to have a significant effect on phase composition and specific surface area (SSA). The calcined Sn x Fe y O z powders were placed in a tubular Inconel reactor and four consecutive thermochemical cycles were performed. Water-splitting and regeneration steps were carried out at 900 C and 1100 C, respectively. The powder calcined in N 2 environment showed a mixed phase composition containing Sn 0.4 Fe 2.6 O 4 and SnO 2 and it generated an average of 1.88 ml of H 2 g À1 cycle À1 .

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Section: -7supporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

H2 generation from two-step thermochemical water-splitting reaction using sol-gel derived SnxFeyOz

Bhosale

Khadka

Puszynski

et al. 2011

Journal of Renewable and Sustainable Energy

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“…The reduction of Fe 3+ to Fe 2+ was regarded by Tamaura as the cause of the weight loss of ferrite with the initial decomposition temperature above 1200 K [10] . The weight loss of different types of ferrites such as MnFe 2 O 4 , NiFe 2 O 4 and ZnFe 2 O 4 was only about 0.1% at 1000℃ under inert atmosphere which was in accordance with the theoretical oxygen loss from Fe 3+ to Fe 2+ .…”

Section: Research On the Mechanism Of Oxygen Loss Of Cufe 2 Omentioning

confidence: 99%

“…The biggest challenge faced in all previous studies is that the high temperatures needed to regenerate the deactivated catalyst after the water splitting step. The decomposition temperature of ZnO and Mn 3 O 4 are 2350 and 1810 K, respectively [8][9][10][11] . It is also the case with the H 2 O/ Nb 2 O 5 / NbO 2 system.…”

Section: Introductionmentioning

confidence: 99%

Studies on the preparation of active oxygen-deficient copper ferrite and its application for hydrogen production through thermal chemical water splitting

Zhang

et al. 2008

Sci. China Ser. B-Chem.

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Hydrogen generation through thermal chemical water splitting technology has recently received increasingly international interest in the nuclear hydrogen production field. Besides the main known sulfur-iodine (S-I) cycle developed by the General Atomics Company and the UT3 cycle (iron, calcium, and bromine) developed at the University of Tokyo, the thermal cycle based on metal oxide two-step water splitting methods is also receiving research and development attention worldwide. In this work, copper ferrite was prepared by the co-precipitation method and oxygen-deficient copper ferrite was synthesized through first and second calcination steps for the application of hydrogen production by a two-step water splitting process. The crystal structure, properties, chemical composition and δ were investigated in detail by utilizing X-ray diffraction (XRD), thermogravimetry (TG) and differential thermal analysis (DTA), atomic absorption spectrometer (AAS), ultraviolet spectrophotometry (UV), gas chromatography (GC), and so on. The experimental two-step thermal chemical cycle reactor for hydrogen generation was designed and developed in this lab. The hydrogen generation process of water splitting through CuFe 2 O 4−δ and the cycle performance of copper ferrite regeneration were firstly studied and discussed.copper ferrite, oxygen deficient, thermal chemical water splitting, hydrogen production

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“…The rate of H2 production via WS reaction was higher in the case of Mn-ferrite as compared to 2 4 and 2 3 (Go et al 2008). A powdered mixture comprised of Mn-ferrite and CaO produced 0.4 to 0.9 ml of H2/g in three WS cycles performed at 1273 K (Tamaura et al 1998). A study also reported that the Mn-ferrite got segregated during the WS reaction (Ehrensberger et al 1996).…”

Section: Mn-ferrite (mentioning

confidence: 91%

Solar Thermochemical Conversion of Carbon Dioxide into Fuel via MnFe2O4 based Two-Step Redox Cycle

Bhosale

2021

Preprint

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Thermodynamic efficiency analysis of [[EQUATION]] based CO 2 splitting (CDS) cycle is reported. HSC Chemistry software is used for performing the calculations allied with the model developed. By maintaining the reduction nonstoichiometry equal to 0.1, variations in the thermal energy required to drive the cycle ( [[EQUATION]] ) and solar-to-fuel energy conversion efficiency ( [[EQUATION]] ) as a function of the ratio of the molar flow rate of inert sweep gas ( [[EQUATION]] ) to the molar flow rate [[EQUATION]] ( [[EQUATION]] ), i.e., [[EQUATION]] , reduction temperature ( [[EQUATION]] ), and gas-to-gas heat recovery effectiveness ( [[EQUATION]] ) are studied. The rise in [[EQUATION]] is responsible for the decrease in [[EQUATION]] . At [[EQUATION]] = 0.7, [[EQUATION]] increases from 176.0 kW to 271.7 kW when [[EQUATION]] escalates from 10 to 100. Conversely, [[EQUATION]] reduces from 14.9% to 9.9% due to the similar increment in [[EQUATION]] . The difference between [[EQUATION]] at [[EQUATION]] = 10 and 100 decreases from 363.3 kW to 19.2 kW as [[EQUATION]] rises from 0.0 to 0.9. As [[EQUATION]] and subsequently [[EQUATION]] reduces as a function of [[EQUATION]] , [[EQUATION]] increases noticeably. At [[EQUATION]] equal to 0.9 and [[EQUATION]] equal to 10 as well as 20, the maximum [[EQUATION]] equal to 17.5% is realized.

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Water splitting with the Mn(II)-ferrite–CaO–H2O system at 1273K

Cited by 14 publications

References 23 publications

H2 generation from two-step thermochemical water-splitting reaction using sol-gel derived SnxFeyOz

H2 generation from two-step thermochemical water-splitting reaction using sol-gel derived SnxFeyOz

Studies on the preparation of active oxygen-deficient copper ferrite and its application for hydrogen production through thermal chemical water splitting

Solar Thermochemical Conversion of Carbon Dioxide into Fuel via MnFe2O4 based Two-Step Redox Cycle

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