Thermochemical production of hydrogen from water

Bamberger, C.E.; Braunstein, J.; Richardson, Dylan

doi:10.1021/ed055p561

Cited by 11 publications

(6 citation statements)

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“…The dark-green K 3 CrO 4 is highly hygroscopic and sensitive, and it is spontaneously oxidized when exposed to air at room temperature. For the typical route to synthesizing K 3 CrO 4 , Cr 2 O 3 , KOH, and K 2 CrO 4 were used as the raw materials, and the reaction was completed at 700°C in approximately 8 h (Banks and Jaunarajs, 1965;Scholder et al, 1968;Bamberger and Richardson, 1975). However, in this work, K 3 CrO 4 was prepared through a simple and low-temperature method.…”

Section: Resultsmentioning

confidence: 99%

In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds

et al. 2017

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In this work, the reduction mechanism of potassium chromate (K2CrO4) was investigated via in situ high-temperature X-ray diffraction coupled with Fourier transform infrared spectroscopy. During the hydrogen reduction of K2CrO4, the formation of K3CrO4, KCrO2, and KxCrO2 were detected for the first time. The study discovered that K2CrO4 was firstly reduced to K3CrO4 and an amorphous Cr(III) intermediate product at low temperature (400–500 °C). Moreover, the K3CrO4 was the only crystalline material at this stage. As the temperature increased, a stabilized amorphous CrOOH was formed. At a high temperature (550–700 °C), KCrO2 was generated. Interestingly, a portion of KCrO2 was spontaneously decomposed during the hydrogen reduction, accompanying by the formation of K0.7CrO2. Finally, the results clearly illustrated the reduction mechanism of K2CrO4: K2CrO4 → K3CrO4 → amorphous intermediate → KCrO2.

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Section: Resultsmentioning

confidence: 99%

In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds

et al. 2017

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“…The primary product of these closed-cycle chemical reactions, hydrogen, is both a carbon-free energy source and a valuable reagent gas (N.B. the current industry annual demand for hydrogen is of about 0.1 Gton, of which only 2% is produced from renewable sources) [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

First Observation of Defined Structural Motifs in the Sulfur‐Iodine Thermochemical Cycle and Their Role in Hydrogen Production

Ramos-Sánchez

Tomkinson

Muñiz-Soria

et al. 2011

International Journal of Spectroscopy

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The present paper investigates the ionic species coexisting in the HIx feed of the sulfur-iodine thermochemical cycle. For this purpose, Raman and inelastic neutron scattering as well as molecular modelling were applied to the study of the binary HI-H2O system and the ternary HI-I2-H2O and KI-I2-H2O systems. Raman spectra, obtained at 298 K, strongly suggest the coexistence of I3−, I−(I2), and I−(I2)2 species. Whereas on the other hand, inelastic neutron scattering spectra (20 K) revealed, for the first time, evidence for the presence of discrete water structural motifs under specific conditions. Molecular modelling of two idealized structures has allowed us to establish a reasonable interpretation of the important structural motifs in these systems, in terms of the azeotrope of the HI-H2O system and the pseudoazeotrope of the HI-I2-H2O system.

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“…The thermal decomposition of water as a source of hydrogen is a topic of current interest (1-12), and some of its aspects have been discussed recently in THIS JOURNAL (13). This subject illustrates facets of the thermodynamics of chemical reactions not commonly presented in chemistry textbooks.…”

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Thermodynamics of the thermal decomposition of water by closed chemical cycles

King¹

1981

J. Chem. Educ.

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Thermochemical production of hydrogen from water

Abstract: If mechanical and electrical energy consumption can be kept at a minimum, thermochemical cycles hold promise for producing hydrogen at higher efficiencies than electrolysis.

Cited by 11 publications

References 2 publications

In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds

In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds

First Observation of Defined Structural Motifs in the Sulfur‐Iodine Thermochemical Cycle and Their Role in Hydrogen Production

Thermodynamics of the thermal decomposition of water by closed chemical cycles

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Thermochemical production of hydrogen from water

Abstract: If mechanical and electrical energy consumption can be kept at a minimum, thermochemical cycles hold promise for producing hydrogen at higher efficiencies than electrolysis.

Cited by 11 publications

References 2 publications

In situ high-temperature X-ray diffraction studies of reduction of K2CrO4 and the formation of KxCrOy compounds

In situ high-temperature X-ray diffraction studies of reduction of K2CrO4 and the formation of KxCrOy compounds

First Observation of Defined Structural Motifs in the Sulfur‐Iodine Thermochemical Cycle and Their Role in Hydrogen Production

Thermodynamics of the thermal decomposition of water by closed chemical cycles

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In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds

In situ high-temperature X-ray diffraction studies of reduction of K₂CrO₄ and the formation of K_xCrO_y compounds