A short-cut chemical looping hydrogen generation system by using iron-based material from steel industry

Wang, Iwei; Ji, Guozhao; Turap, Yusan; Nie, Hailiang; Li, Zhenshan; Zhao, Ming; Wang, Wei

doi:10.1016/j.cej.2020.124882

Cited by 14 publications

(7 citation statements)

References 39 publications

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“…Desta forma, há aplicação em diversos contextos: dispositivos domésticos que proporcionam conveniência e eficiência energética (Wang, 2018), no monitoramento da qualidade da água (Sun et al, 2017) e no gerenciamento de um zoológico (Mali, 2019). Diante dos diversos setores existentes que a Internet das Coisas pode atuar, a área da saúde pode acarretar grande impacto.…”

Section: Introductionunclassified

Modelagem Bayesiana aplicada para cálculo da probabilidade de falha em Sistemas de Saúde IoT

Kinjo¹,

Librantz²,

Souza³

et al. 2022

risti

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A implantação da tecnologia da Internet das Coisas (IoT) traz benefícios à vida, como controle remoto de pragas na agricultura, monitoramento da cadeia de suprimentos, melhoria na educação e monitoramento de pacientes. No entanto, apesar dos benefícios, existem desafios embutidos na implementação desta tecnologia. Um dos maiores desafios da área é a violação de privacidade e segurança de dados. Portanto, é necessário avaliar a probabilidade de falha dos elementos e, consequentemente, a causa desse problema. Assim, é neste contexto que este trabalho se propõe a identificar, modelar e calcular a probabilidade de falha através de uma análise sistemática, utilizando Redes Bayesianas. Os resultados mostraram que através do uso do modelo proposto foi possível avaliar diferentes cenários para o uso de redes de Internet das Coisas, bem como simular o efeito da probabilidade de falha nos elementos críticos do sistema.

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Section: Introductionunclassified

Modelagem Bayesiana aplicada para cálculo da probabilidade de falha em Sistemas de Saúde IoT

Kinjo¹,

Librantz²,

Souza³

et al. 2022

risti

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“…Although hydrogen can be produced from BFG via a water–gas shift (WGS) reaction followed by gas separation, this conventional approach would be rather inefficient due to the presence of large amounts of N 2 and CO 2 in BFG. Chemical looping approaches, on the other hand, perform fuel conversion and water splitting in separate steps, providing an inherently concentrated hydrogen product. − Originally proposed for CO 2 capture from fossil fuel combustion, the chemical looping gasification (CLG) or chemical looping water splitting (CLWS) approaches have received increasing attention. − Briefly, an oxide-based oxygen carrier is used to convert a fuel into hydrogen and/or heat via a cyclic redox process. − …”

Section: Introductionmentioning

confidence: 99%

Liquid Metal Shell as an Effective Iron Oxide Modifier for Redox-Based Hydrogen Production at Intermediate Temperatures

et al. 2021

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This study reports molten metals (bismuth, indium, and tin) as effective modifiers for iron-based redox catalysts in the context of chemical loopingbased hydrogen production at intermediate temperatures (450−650 °C) from lowcalorific-value waste gas (e.g., blast furnace gas). The effects of the bismuth promoter on both the surface and bulk properties of iron oxides were studied in detail. Transmission electron microscopy and energy-dispersive spectroscopy (TEM-EDS), low-energy ion scattering (LEIS), Raman spectroscopy, and 18 O 2 exchange experiment revealed that the bismuth modifier forms an overlayer covering the bulk iron (oxides), leading to better anti-coking properties compared to reference La 0.8 Sr 0.2 FeO 3 -and Ce 0.9 Gd 0.1 O 2 -supported iron oxides. The Bimodified sample also exhibited improved anti-sintering properties and high redox activity, resulting in a 4-fold increase in oxygen capacity compared to pristine Fe 2 O 3 (28.9 vs 6.4 wt %) under a cyclic redox reaction at 550 °C. Meanwhile, a small amount of bismuth is doped into the iron oxide structure to effectively enhance its redox properties by lowering the oxygen vacancy formation energy (from 3.1 to 2.1 eV) and the energy barrier for vacancy migration, as confirmed by the experimental results and density functional theory (DFT) calculations. Reactive testing indicates that Bi-modified redox catalysts are highly active to convert low-calorific-value waste gases such as blast furnace gas. Our study also indicates that this strategy can be generalized to low-melting-point metals such as Bi, In, and Sn for iron oxide modification in chemical looping processes.

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“…Finally, the semi-oxidized oxygen carrier (Fe 3 O 4 ) is regenerated to Fe 2 O 3 with air (O 2 + Fe 3 O 4 → Fe 2 O 3 ). Actually, the CLHG process could also be simplified to a short-cut cycle of deep reduction and steam oxidation process corresponding to the transition of Fe 3 O 4 ↔ FeO/Fe …”

Section: Introductionmentioning

confidence: 99%

“…Then, in the steam oxidation process, the deep reduced oxygen carrier (Fe/FeO) is oxidized by steam, and steam oxidation process corresponding to the transition of Fe 3 O 4 ↔ FeO/Fe. 10 The reduction of the Fe-based oxygen carrier also plays an important role in the CLHG process which may affect oxygen carrier design (Table 1). The deep reduction could be realized by different ways including combustion, 11−14 gasification, 15 and reforming.…”

Section: Introductionmentioning

confidence: 99%

Natural Iron Ore as Oxygen Carrier Modified with Rare Earth Metal for Chemical Looping Hydrogen Production

Cui

Wang

et al. 2021

Energy Fuels

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Chemical looping hydrogen production (CLHG) represents a novel technology for H2 production. Natural iron ore is a potential oxygen carrier for CLHG but is facing a challenge of low deep reduction reactivity. This paper aims at promoting the reduction reactivity of iron ore and H2 production using Ce-doped and La-doped iron ore with an impregnation method. The oxygen carriers were characterized by SEM-EDX, XRD, and XPS. The reactivity and stability of the doped iron ore were evaluated in TGA. The CLHG process was carried out in a fixed bed system, and the effect of rare earth metal on oxygen carrier conversion and H2 production was evaluated. The results indicate that both Ce-doped and La-doped iron ore as oxygen carriers exhibited a higher reduction reactivity than the raw iron ore and a relatively stable redox performance at 900 °C after the initial activation process. Reasonable Ce loading (5–10%), La loading (2.5–15%), and temperature (above 850 °C) could promote oxygen carrier conversion and enhance H2 production. The La-Fe interaction enabled the iron ore to be oxidized to LaFeO3 (Fe3+) during water splitting, promoting H2 production. Carbon deposition was not formed during the reduction process, and H2 purity remained at 100% during the whole water splitting process.

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A short-cut chemical looping hydrogen generation system by using iron-based material from steel industry

Cited by 14 publications

References 39 publications

Modelagem Bayesiana aplicada para cálculo da probabilidade de falha em Sistemas de Saúde IoT

Modelagem Bayesiana aplicada para cálculo da probabilidade de falha em Sistemas de Saúde IoT

Liquid Metal Shell as an Effective Iron Oxide Modifier for Redox-Based Hydrogen Production at Intermediate Temperatures

Natural Iron Ore as Oxygen Carrier Modified with Rare Earth Metal for Chemical Looping Hydrogen Production

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