Thermo-chemical water splitting: Selection of priority reversible redox reactions by multi-attribute decision making

Deng, Yimin; Dewil, Raf; Appels, Lise; Li, Shuo; Baeyens, Jan; Degrève, Jan; Wang, Guirong

doi:10.1016/j.renene.2021.02.009

Cited by 41 publications

(24 citation statements)

References 45 publications

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“…An earlier paper by the authors [12] assessed and classified different thermo-chemical water splitting redox reactions. A redox system ranking was developed by applying multiple assessment criteria, including energy efficiency, H 2 yield, conversion, cyclic operation, production cost, and environmental and safety impacts.…”

Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

“…Selected systems should operate at lower temperatures, preferably below 1000 • C for the reactor wall temperature. Deng et al [12] finally selected 4 out of 24 redox reactions that meet the systems' selection priorities. These systems included Mn 3 O 4 /MnO/NaMnO 2 , MnFe 2 O 4 , U 3 O 8 /UO 2 CO 3 and ZnO/Fe 3 O 4 /ZnFe 2 O 4 redox reactions.…”

Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

“…The U 3 O 8 system was discarded for nuclear hazard reasons, and the ZnO system scored 30% lower than both other redox reactions and was hence eliminated from a priority investigation. Both the MnFe 2 O 4 and Mn 3 O 4 /MnO/NaMnO 2 redox processes are of a multi-step nature, where water is decomposed into H 2 and O 2 via a medium-temperature two-step (MnFe 2 O 4 ) or a medium-temperature four-step process (Mn 3 O 4 ), respectively, that forms a closed cycle [12]. This process was previously fostered as having a high potential [13] and involves four reaction steps, as shown below.…”

Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

“…It is hence important to develop novel green H 2 production methods, as reviewed and studied by the authors [1,3,11]. Among these methods, thermo-chemical water splitting by redox systems [12] could be considered to have significant potential and thus is the subject of the present research.…”

Section: Introduction 1the Need To Develop H 2 Productionmentioning

confidence: 99%

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Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Liu

Dewil

et al. 2022

Sustainability

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Thermal water splitting by redox reactants could contribute to a hydrogen-based energy economy. The authors previously assessed and classified these thermo-chemical water splitting redox reactions. The Mn3O4/MnO/NaMnO2 multi-step redox cycles were demonstrated to have high potential. The present research experimentally investigated the MnOx/Na2CO3 redox water splitting system both in an electric furnace and in a concentrated solar furnace at 775 and 825 °C, respectively, using 10 to 250 g of redox reactants. The characteristics of all reactants were determined by particle size distribution, porosity, XRD and SEM. With milled particle and grain sizes below 1 µm, the reactants offer a large surface area for the heterogeneous gas/solid reaction. Up to 10 complete cycles (oxidation/reduction) were assessed in the electric furnace. After 10 cycles, an equilibrium yield appeared to be reached. The milled Mn3O4/Na2CO3 cycle showed an efficiency of 78% at 825 °C. After 10 redox cycles, the efficiency was still close to 60%. At 775 °C, the milled MnO/Na2CO3 cycles showed an 80% conversion during cycle 1, which decreased to 77% after cycle 10. Other reactant compounds achieved a significantly lower conversion yield. In the solar furnace, the highest conversion (>95%) was obtained with the Mn3O4/Na2CO3 system at 775 °C. A final assessment of the process economics revealed that at least 30 to 40 cycles would be needed to produce H2 at the price of 4 €/kg H2. To meet competitive prices below 2 €/kg H2, over 80 cycles should be achieved. The experimental and economic results stress the importance of improving the reverse cycles of the redox system.

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Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

Section: Hydrogen Production By Water Splitting In Thermal Redox Systemsmentioning

confidence: 99%

Section: Introduction 1the Need To Develop H 2 Productionmentioning

confidence: 99%

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Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Liu

Dewil

et al. 2022

Sustainability

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“…The design of fluid-solid processes often relies on using empirical correlations that include characteristic powder properties such as the particle size and its size spread, the particle shape and density and the bed voidage for particle assemblies [1][2][3][4][5][6][7]. Unfortunately, most correlations do only provide predictions within a range of ±25%.…”

Section: Introductionmentioning

confidence: 99%

The Need to Accurately Define and Measure the Properties of Particles

et al. 2021

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When dealing with powders, a fundamental knowledge of their physical parameters is indispensable, with different methods and approaches proposed in literature. Results obtained differ widely and it is important to define standards to be applied, both toward the methods of investigation and the interpretation of experimental results. The present research intends to propose such standards, while defining general rules to be respected. Firstly, the problem of defining the particle size is inspected. It was found that describing the size of a particle is not as straightforward as one might suspect. Factors of non-sphericity and size distributions make it impossible to put ‘size’ in just one number. Whereas sieving can be used for coarser particles of a size in excess of about 50 µm, instrumental techniques span a wide size range. For fine particles, the occurrence of cohesive forces needs to be overcome and solvents, dispersants and sample mixing need to be applied. Secondly, the shape of the particles is examined. By defining sphericity, irregularly shaped particles are described. Finally, the density of particles, of particle assemblies and their voidage (volume fraction of voids) and the different ways to investigate them are explored.

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Systematic review of MCDM approach applied to the medical case studies of COVID-19: trends, bibliographic analysis, challenges, motivations, recommendations, and future directions

Alamoodi

Zaidan

Albahri

et al. 2023

Complex Intell. Syst.

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When COVID-19 spread in China in December 2019, thousands of studies have focused on this pandemic. Each presents a unique perspective that reflects the pandemic’s main scientific disciplines. For example, social scientists are concerned with reducing the psychological impact on the human mental state especially during lockdown periods. Computer scientists focus on establishing fast and accurate computerized tools to assist in diagnosing, preventing, and recovering from the disease. Medical scientists and doctors, or the frontliners, are the main heroes who received, treated, and worked with the millions of cases at the expense of their own health. Some of them have continued to work even at the expense of their lives. All these studies enforce the multidisciplinary work where scientists from different academic disciplines (social, environmental, technological, etc.) join forces to produce research for beneficial outcomes during the crisis. One of the many branches is computer science along with its various technologies, including artificial intelligence, Internet of Things, big data, decision support systems (DSS), and many more. Among the most notable DSS utilization is those related to multicriterion decision making (MCDM), which is applied in various applications and across many contexts, including business, social, technological and medical. Owing to its importance in developing proper decision regimens and prevention strategies with precise judgment, it is deemed a noteworthy topic of extensive exploration, especially in the context of COVID-19-related medical applications. The present study is a comprehensive review of COVID-19-related medical case studies with MCDM using a systematic review protocol. PRISMA methodology is utilized to obtain a final set of (n = 35) articles from four major scientific databases (ScienceDirect, IEEE Xplore, Scopus, and Web of Science). The final set of articles is categorized into taxonomy comprising five groups: (1) diagnosis (n = 6), (2) safety (n = 11), (3) hospital (n = 8), (4) treatment (n = 4), and (5) review (n = 3). A bibliographic analysis is also presented on the basis of annual scientific production, country scientific production, co-occurrence, and co-authorship. A comprehensive discussion is also presented to discuss the main challenges, motivations, and recommendations in using MCDM research in COVID‐19-related medial case studies. Lastly, we identify critical research gaps with their corresponding solutions and detailed methodologies to serve as a guide for future directions. In conclusion, MCDM can be utilized in the medical field effectively to optimize the resources and make the best choices particularly during pandemics and natural disasters.

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Thermo-chemical water splitting: Selection of priority reversible redox reactions by multi-attribute decision making

Cited by 41 publications

References 45 publications

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

Water Splitting by MnOx/Na2CO3 Reversible Redox Reactions

The Need to Accurately Define and Measure the Properties of Particles

Systematic review of MCDM approach applied to the medical case studies of COVID-19: trends, bibliographic analysis, challenges, motivations, recommendations, and future directions

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