Development of Fe2O3-based, Al2O3-stabilized Oxygen Carriers using Sol-gel Technique for H2 Production via Chemical Looping

Yüzbasi, Nur Sena; Kierzkowska, Agnieszka M.; Müller, Christoph R.

doi:10.1016/j.egypro.2017.03.1186

Cited by 24 publications

(17 citation statements)

References 14 publications

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“…The effect of FeAl 2 O 4 spinel is contradictory because its formation can reduce the sintering of oxygen carriers while reducing the storage capacity of Fe 2 O 3 [246]. Yüzbasi et al [247] prepared Al 2 O 3 -supported iron oxide oxygen carriers with a loading of 80% by the sol-gel method and used three different Fe salts as Fe precursors. XRD characterization revealed that the FeAl 2 O 4 spinel only existed in the oxygen carrier using ferric chloride as a precursor.…”

Section: Iron Based Oxygen Carriermentioning

confidence: 99%

Chemical looping reforming: process fundamentals and oxygen carriers

et al. 2022

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Chemical looping reforming (CLR) provides a viable process intensification approach for clean and efficient syngas production from carbonaceous fuel with inherent gas–gas separation. The rational design of metal oxide-based oxygen carriers and the scale-up of associated CLR reactor systems play important roles in CLR process development. This review first introduces the concept and advantages of CLR as well as its historical development. The process fundamentals, including basic schemes, reaction stoichiometry, thermodynamics, kinetics and reactor system design, are reviewed. The integral approach for CLR process development is illustrated, showing that the design and compatibility of oxygen carriers and reactor systems are critical for CLR performance. The reaction principle during the reduction of oxygen carriers is discussed, followed by strategies for improving the redox reactivity and stability. We further review and discuss the latest exciting advances on this subject with the purpose of illustrating factors that govern fundamental mechanisms in the redox reaction chemistry of oxygen carriers and their design principles for sustained chemical looping reactor applications. It is expected that these new advances will inspire more effective oxygen carriers and efficient reactor systems for the development and deployment of various CLR processes.

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Section: Iron Based Oxygen Carriermentioning

confidence: 99%

Chemical looping reforming: process fundamentals and oxygen carriers

et al. 2022

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“…However, FeAl 2 O 4 was generally regarded as the phase which could benefit chemical looping combustion (CLC). The formation of FeAl 2 O 4 could prevent the sintering between each particle [28]. Moreover, it could be reversed to Fe 2 O 3 and Al 2 O 3 in an oxidizing reaction and then be involved in the reaction again.…”

Section: Selection For Oxygen Carriermentioning

confidence: 99%

Feasibility Study of an Iron-Based Composite Added with Al2O3/ZrO2 as an Oxygen Carrier in the Chemical Looping Applications

2021

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The chemical looping process is a promising approach for carbon capture. Oxygen carriers play the crucial role of carrying oxygen between oxidation and reduction reactors. In this study, iron-based composites, added with alumina and zirconia, were used as the oxygen carriers. The feasibility study of these composites for chemical looping applications was then evaluated by measuring their properties, including mechanical properties, relative density, microstructures, crystal structure, and their capacity of oxygen. The results suggest that the addition of zirconia led the decrease of the bulk relative density and thus had a negative effect to both crush strength and attrition. Crush strength declined from 57 kgf to 26 kgf when using zirconia, replacing alumina, in an iron-based composite as the inner material. In addition, the phases in oxidizing and reducing reaction were also revealed. The formation of the spinel phase (FeAl2O4) was the major factor that altered the capacity of oxygen. It inhibited Fe2O3’s ability to be completely reduced to Fe and thus decrease the capacity of oxygen. The value was therefore decreased from 9.7% to 6.2% after 50 redox cycles in alumina addition composite. On the other hand, for the zirconia addition, all of the Fe2O3 could transform to Fe, which provided 8.5% of oxygen capacity after 50 redox cycles. A dense layer which was identified as the Fe2O3 in the bulk surface was observed in the samples reacted with 50 redox cycles. The proposed mechanism of the formation of Fe2O3 layer and its corresponding kinetic analysis was also revealed in this study.

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“…For example, the lack of control of the crystallization of the metal precursors would lead to low specific surface areas and poorly dispersed active metal oxides. [ 114 ] In contrast, sol‐gel chemistry offers easily reproducible recipes for preparing nano‐dispersed metal oxides. Therefore, sol‐gel is a preferred method for synthesizing mixed oxides oxygen carriers, such as spinels and perovskites.…”

Section: Overview Of Oxygen Carriersmentioning

confidence: 99%

“…For example, the unintentional formation of spinel‐type bimetallic oxides has been extensively reported for active metal oxides supported on alumina. [ 1,106,114 ] According to Keller et al., [ 103 ] the use of LD stone (iron‐based natural material) as OCs yielded complex iron‐containing minerals, for example, Ca 2 Fe 1.2 Mg 0.4 Si 0.4 O 5 and (Fe, Mg)SiO 3 , owing to the chemical reaction between Fe 3 O 4 , Ca 2 SiO 4 , MgO, SiO 2 , and Ca 3 Mg(SiO 4 ) 3 . In this case, Fe species are trapped in an inert mineral, resulting in chemical deactivation of the OCs.…”

Section: Operando Characteristics Of Oxygen Carriersmentioning

confidence: 99%

Developing Oxygen Carriers for Chemical Looping Biomass Processing: Challenges and Opportunities

Zhou

Luo

et al. 2020

Advanced Sustainable Systems

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of global average temperature to within 2 °C compared to pre-industrial era, [2] it is necessary to rapidly reduce our reliance on fossil fuels. To this end, tremendous efforts have been put in to ramp up the capacities of renewable energy generation, including solar, wind, hydro, geothermal, tidal, etc. [3] However, non-biological renewables are available intermittenty, location-specific, and require costly infra

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Development of Fe2O3-based, Al2O3-stabilized Oxygen Carriers using Sol-gel Technique for H2 Production via Chemical Looping

Cited by 24 publications

References 14 publications

Chemical looping reforming: process fundamentals and oxygen carriers

Chemical looping reforming: process fundamentals and oxygen carriers

Feasibility Study of an Iron-Based Composite Added with Al2O3/ZrO2 as an Oxygen Carrier in the Chemical Looping Applications

Developing Oxygen Carriers for Chemical Looping Biomass Processing: Challenges and Opportunities

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