Solar Thermochemical Hydrogen (STCH) Processes

Gorensek, Maximilian B.; Corgnale, Claudio; Weidner, John W.

doi:10.1149/2.f05181if

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…For renewable hydrogen to be competitive with existing hydrogen production technologies, the conversion processes being considered must be comparable in cost to that of the industry standard, steam-methane reforming. The hybrid sulfur (HyS) process has been suggested as one of the alternatives for hydrogen production that could meet this cost target [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

High-performance SO2-depolarized electrolysis cell using advanced polymer electrolyte membranes

Colón-Mercado

Gorensek

Fujimoto

et al. 2022

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

High-performance SO2-depolarized electrolysis cell using advanced polymer electrolyte membranes

Colón-Mercado

Gorensek

Fujimoto

et al. 2022

International Journal of Hydrogen Energy

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“…from gas generation during Step 1 or generation of steam in Sep 3) to pressurize the anolyte of the SO 2 -depolarized cell without the use of pumps to reduce the voltage needed [15]. Further, the water and SO 2 distilled from the refluxing H 2 SO 4 in Step 3 can enter the anolyte at high temperature, eliminating the need to heat the solution to operating temperatures up to 140 °C [70]. The use of electrolysis to produce the H 2 product can also ensure that the H 2 is highly pure and free from sulfur contaminants.While attractive from a thermodynamic standpoint, implementation of SO 2 -depolarized electrochemical cells to produce H 2 has several technical challenges and is an active area of research [15,66,68,69,[71][72][73].…”

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confidence: 99%

“…https://doi.org/10.26434/chemrxiv-2024-8hfnv ORCID: https://orcid.org/0000-0002-1356-0387 Content not peer-reviewed by ChemRxiv. License: CC BY 4.0 o C [66,70,75]. …”

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confidence: 99%

Carbon-Negative production of Hydrogen through Sulfur Intermediates

Bachman,

Hamers

2024

Preprint

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Chemical fuel production from biomass represents one method for decarbonizing the global energy infrastructure. However, current technologies have significant drawbacks that limit application to select feedstocks. For example, the endothermic steam-reforming process is limited to gasified low-sulfur feedstocks that have thus far precluded the economic utilization of municipal solid wastes (MSW) among other sources of biomass. The use of elemental S is one potential method to utilize these organic wastes for H2 production through the high-temperature and exothermic production of hydrogen sulfide (H2S) and carbon disulfide (CS2) gasses as chemical intermediates. These reduced sulfur species are thermodynamically unstable with respect to their oxygen-analogs, which indicates that usable chemical energy may be derived from their oxidation. When biomass is dehydrogenated with S at lower temperatures, the formation of CS2 is suppressed and sulfurized biochar is produced. In this work, we describe and analyze a possible cyclic route to producing H2 from these species through the use of well-known chemical reactions operating in continuous fashion using cellulose as an example molecule. This “sulfur-reforming” process and additional steps may allow for the economical valorization of currently unutilized organic matter in MSW that may be contributing to environmental harm. If the sulfurized biochar is left sequestered, such as through use as a soil-amendment, and if the electrical energy is sourced from renewables, this process may be considered carbon-negative.

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