Uranium thermochemical cycle used for hydrogen production

Ai-mei, Chen; Liu, Chunxia; Zhang, Lan

doi:10.1016/j.net.2018.08.018

Cited by 7 publications

(2 citation statements)

References 14 publications

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“…Hydrogen is also derived from renewable sources like the naturally available wind and sun ( Carroquino et al, 2019 ). Hydrogen is also produced using elements like uranium among others ( Chen et al, 2019a ). Thus the different methods used in hydrogen production give varying amounts of hydrogen and in turn varying amounts of byproducts.…”

Section: Introductionmentioning

confidence: 99%

Thermocatalytic Hydrogen Production Through Decomposition of Methane-A Review

et al. 2021

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Consumption of fossil fuels, especially in transport and energy-dependent sectors, has led to large greenhouse gas production. Hydrogen is an exciting energy source that can serve our energy purposes and decrease toxic waste production. Decomposition of methane yields hydrogen devoid of COx components, thereby aiding as an eco-friendly approach towards large-scale hydrogen production. This review article is focused on hydrogen production through thermocatalytic methane decomposition (TMD) for hydrogen production. The thermodynamics of this approach has been highlighted. Various methods of hydrogen production from fossil fuels and renewable resources were discussed. Methods including steam methane reforming, partial oxidation of methane, auto thermal reforming, direct biomass gasification, thermal water splitting, methane pyrolysis, aqueous reforming, and coal gasification have been reported in this article. A detailed overview of the different types of catalysts available, the reasons behind their deactivation, and their possible regeneration methods were discussed. Finally, we presented the challenges and future perspectives for hydrogen production via TMD. This review concluded that among all catalysts, nickel, ruthenium and platinum-based catalysts show the highest activity and catalytic efficiency and gave carbon-free hydrogen products during the TMD process. However, their rapid deactivation at high temperatures still needs the attention of the scientific community.

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Section: Introductionmentioning

confidence: 99%

Thermocatalytic Hydrogen Production Through Decomposition of Methane-A Review

et al. 2021

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“…Dentre os métodos estudados estão a eletrólise da água [4], tecnologias de reforma a vapor [5], ciclos termoquímicos [6] e fotocatálise [7], [8]. Os ciclos termoquímicos são reações químicas que provocam a quebra da molécula da água, e consequentemente liberam o hidrogênio.…”

Section: Introductionunclassified

Decomposição Térmica Do Sulfato De Zinco Na Presença De Agentes Modificadores Do Mecanismo Reacional

KURBAN¹

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Hydrogen presents itself as a potential alternative fuel to replace fossil fuels and, for this reason, studies and research on the production and storage routes of this resource are in vogue in the scientific community. The methods for obtaining H2 are diverse, however, not all methods are from renewable sources. The thermochemical cycles of splitting water are promising alternatives. In this context, the sulfur-iodine cycle is one of the highlighted cycles, characterized by a threestage process whose third stage is the challenging stage of the cycle, where the decomposition of sulfuric acid occurs, which requires a high energy expenditure for formation selection of sulfur dioxide and oxygen. The use of metal sulfates associated with reducing agents and additives in substitution for sulfuric acid in the sulfur-iodine cycle has been studied. Thus, the present research work evaluated the thermal decomposition of zinc sulfate monohydrate in the presence of elemental sulfur modifying agents, Pd-γAl2O3, CeO2 and CeO2 / ZnO that stimulate the transformation of sulfur trioxide in the respective dioxide. In addition to a thermodynamic study of the reaction system and thermal analyzes via TGA that indicated a change in the sulphate decomposition behavior in the presence of the reducing agent and additives, the work predicted the characterization of the reaction products indicating the presence of zinc oxide and a study kinetics of the systems in the presence of the mentioned agents, allowing the calculation of activation energies and kinetic parameters. The thermodynamic assessment indicated a favorable aspect regarding the decrease in the decomposition temperature of zinc sulfate as well as with regard to the transformation of SO3 into SO2. In the presence of Pd-γAl2O3, the final temperature of the sulphate decomposition occurred 100 ° C below the usual temperature. The total mass loss calculated for the decomposition of pure sulfate was 55%. In studies with the presence of agents, the calculated total mass losses were 60%, 54%, 62%, 57% corresponding to zinc sulfate in the presence of elemental sulfur, Pd-γAl2O3, CeO2 and CeO2 / ZnO, respectively.

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