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

Bhosale, Rahul R.; Khadka, Rajesh; Puszynski, Jan A.; Shende, Rajesh V.

doi:10.1063/1.3659684

Cited by 35 publications

(15 citation statements)

References 32 publications

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“…In addition, as a promising alternative option for CO 2 geological and oceanic sequestration, the liberated CO 2 can be re-energized into CO via a metal oxide based thermochemical looping process using concentrated solar energy. [20][21][22][23] The CO produced via solar thermochemical CO 2 -splitting can be combined with H 2 derived from metal oxide based solar thermochemical water-splitting process to form solar syngas 21,22,24,25 which can be further processed to liquid fuels such as Methanol, Diesel, and Kerosene via the Fischer-Tropsch process.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of thermal degradation of renewably prepared amines useful for flue gas treatment

Bhosale

Mahajani

2013

Journal of Renewable and Sustainable Energy

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N-ethylmonoethanolamine (EMEA) and N-N-diethylmonoethanolamine (DEMEA) can be prepared from renewable resources and appear to be commercially attractive solvents for post-combustion CO 2 capture by absorption/stripping process. In this paper, the thermal degradation of these renewably prepared amines was studied at 423 K and compared with other amines such as monoethanolamine, diethanolamine, triethanolamine, and N-methyl diethanolamine. Furthermore, an investigation of the kinetics of thermal degradation of aqueous EMEA and DEMEA was conducted by using a 600 ml high-temperature high-pressure reactor in the temperature range of 393 to 423 K and amine concentration range of 1 to 3 kmol m À3 , respectively. Estimation of the active solvent content of the reaction mixture samples obtained during the degradation experiments was performed using a gas chromatograph (GC) equipped with a Flame Ionization Detector (FID) and a Tenax GC column. The obtained results indicate that the rate of thermal degradation of both aqueous EMEA and DEMEA increases with the increase in the initial amine concentration and temperature. Additionally, the degradation reaction was observed to be first order with respect to the initial amine concentration. Two intrinsic kinetic power law models were formulated to describe the kinetics of the thermal degradation of aqueous EMEA and DEMEA and the kinetic parameters were predicted by using the linear least-squares regression analysis. The kinetic rate constants for the thermal degradation of these renewably prepared amines were determined (both experimentally and by the models) and on the basis of their temperature dependency, the activation energy for the degradation reaction was estimated. This work represents the first attempt towards obtaining the intrinsic kinetic data for thermal degradation of aqueous EMEA and DEMEA and formulating a kinetic model that fits the data based on the initial rate of degradation. V C 2013 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Kinetics of thermal degradation of renewably prepared amines useful for flue gas treatment

Bhosale

Mahajani

2013

Journal of Renewable and Sustainable Energy

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“…16 The selection of Ni-ferrite was based on the fact that it has shown maximum H 2 volume generation among different redox materials reported, which include single phase spinel (AFe 2 O 4 ), 17 19 or their mixtures. [20][21][22][23][24] Ceramic material such as ZrO 2 has exceptional thermal stability, which when mixed with Ni-ferrite via vortex mixing 16 and examined for H 2 generation from thermochemical water-splitting reaction, indicated reduction in grain growth or sintering. The powdered mixtures comprised of Ni-ferrite and a thermally stable material has shown slightly higher H 2 volume generation as compared to ferrite alone.…”

Section: Introductionmentioning

confidence: 99%

H2 generation from thermochemical water-splitting using yttria stabilized NiFe2O4 core-shell nanoparticles

Amar

Puszynski

Shende

2015

Journal of Renewable and Sustainable Energy

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This investigation reports synthesis of core-shell NiFe 2 O 4 /Y 2 O 3 nanoparticles by sol-gel technique and their H 2 volume generation ability via thermochemical water-splitting reaction at 900 C-1100 C. Thermochemical water-splitting process involves a cyclic operation of a low-temperature water-splitting step and relatively high temperature regeneration step using redox materials. Because of the cyclic nature of the process, the redox materials undergo thermal fatigue leading to grain growth or sintering, consequently, steady H 2 production is not realized in multiple thermochemical cycles. In this study, attempts were made to achieve steady H 2 volume generation in multiple thermochemical cycles using core-shell nanoparticles, which were synthesized using precursors such as NiCl 2 , FeCl 2 , and YCl 3 , and pluronic P123 surfactant template. H 2 volume generated by NiFe 2 O 4 /Y 2 O 3 core-shell nanoparticles was found to be relatively stable over multiple thermochemical cycles. Contrasting to this, the H 2 volume generation was found to decrease continuously over multiple thermochemical cycles using NiFe 2 O 4 nanoparticles as well as NiFe 2 O 4 /Y 2 O 3 powdered mixture of nanoparticles. The transient O 2 profiles were also compared for both the core-shell nanoparticles and powdered mixture during multiple regeneration steps. Detailed transmission electron microscopy (TEM) analysis clearly provided evidence of core-shell morphology with NiFe 2 O 4 core encapsulated by Y 2 O 3 shell. The grain size and morphological properties of as-prepared nanoparticles were compared with the nanoparticles obtained after thermochemical water-splitting reaction using powdered X-ray diffraction, and scanning electron microscopy. V C 2015 AIP Publishing LLC. [http://dx.

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“…Among the many MOs investigated so far for solar fuel production, in recent years, research has been focused towards non-volatile mixed MOs such as ferrites [6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Ferrites are particularly appealing as their reduced form is a solid and hence the separation of a gaseous metal (or MO) and O 2 , a challenging and compulsory step in cycles based on ZnO/Zn or SnO 2 /SnO/Sn, can be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical Conversion of CO2 into Solar Fuels Using Ferrite Nanomaterials

Bhosale¹,

Dardor²,

Gharbia³

et al. 2015

Proceedings of the 4th International Gas Processing Symposium

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

Cited by 35 publications

References 32 publications

Kinetics of thermal degradation of renewably prepared amines useful for flue gas treatment

Kinetics of thermal degradation of renewably prepared amines useful for flue gas treatment

H2 generation from thermochemical water-splitting using yttria stabilized NiFe2O4 core-shell nanoparticles

Thermochemical Conversion of CO2 into Solar Fuels Using Ferrite Nanomaterials

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