Development of MgAl2O4-stabilized, Cu-doped, Fe2O3-based oxygen carriers for thermochemical water-splitting

Imtiaz, Qasim; Yüzbasi, Nur Sena; Abdala, Paula M.; Kierzkowska, Agnieszka M.; Beek, Wouter van; Broda, Małgorzata A.; Müller, Christoph R.

doi:10.1039/c5ta06753g

Cited by 60 publications

(54 citation statements)

References 34 publications

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“…During reduction, it is easy to form defective structure and cracks for the further reaction. Imtiaz et al reported that Cu metal and Fe 3 O 4 segregated from CuFe 2 O 4 spinel structure, which was in agreement with the results of Kang and Shin . When the reductive gas was CO, we speculate that such a reaction would happen:

3 Cu {Fe}_{2} O_{4} + 4 CO \to 4 {CO}_{2} + 3 Cu + 2 {Fe}_{3} O_{4} .

…”

Section: Resultssupporting

confidence: 91%

“…As discussed above, the carbon deposition was significantly suppressed by introducing potassium and copper to modify iron ore. The similar effect was also observed when iron‐based oxygen carrier was modified by copper or potassium separately . It was the first work to investigate the property of carbon deposition based on iron ore co‐decorated by potassium and copper, and the condition was different from most of the previous researches .…”

Section: Resultsmentioning

confidence: 65%

“…Carbon formation possibly happens when the conversion of fuel and the reactivity of oxygen carrier are low . Much work has focused on developing the methods to enhance the redox rate of iron oxides . The common attempt to increase the reactivity of iron oxides is to introduce foreign additives.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of copper based on the iron oxygen carriers had been proven to be capable to accelerate the rate and reactivity of reduction in the CLC process . And Fe 2 O 3 ‐based material modified by copper was reported to show a high redox reactivity and low carbon deposition rate in the hydrogen production process . Kang et al has reported that the carbide and graphite formation were inhibited effectively for CuFe 2 O 4 , as compared with Fe 3 O 4 .…”

Section: Introductionmentioning

confidence: 99%

“…15 Much work has focused on developing the methods to enhance the redox rate of iron oxides. 12,[16][17][18][19][20][21] The common attempt to increase the reactivity of iron oxides is to introduce foreign additives. The addition of copper based on the iron oxygen carriers had been proven to be capable to accelerate the rate and reactivity of reduction in the CLC process.…”

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confidence: 99%

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Inhibition of carbon deposition using iron ore modified by K and Cu in chemical looping hydrogen generation

et al. 2018

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Summary Chemical looping hydrogen generation based on iron is an innovative method to produce high purity hydrogen and capture CO2 simultaneously. However, carbon deposition of iron ore limits the development. The iron ore modified by K and Cu was employed to suppress the carbon deposition. Experiments were carried out to investigate the effects of the additive amount on carbon deposition and hydrogen purity via carbon release characteristics in a batch fluidized bed. The carbon deposition ratio decreased monotonically with the increasing amount of potassium, but the excess copper loading led to a rise in the ratio of carbon deposition instead. The carbon deposition ratio decreased by up to 84% after adding K and Cu, which is speculated to be closely related to the weight ratio of Fe on the oxygen carrier surfaces. The experimental results at different temperatures demonstrated that 850°C was suitable for the inhibition of carbon deposition and sintering. In addition, the mechanism of inhibition of carbon deposition was proposed in detail and illustrated that it was correlated to the covering of active sites and the reactivity enhancement. Moreover, the carbon deposition ratio of the modified oxygen carrier maintained stable during the cyclic experiments. Therefore, it is feasible to employ the iron ore modified by K and Cu as oxygen carrier to suppress carbon deposition in the chemical looping hydrogen generation.

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3 Cu {Fe}_{2} O_{4} + 4 CO \to 4 {CO}_{2} + 3 Cu + 2 {Fe}_{3} O_{4} .

…”

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Inhibition of carbon deposition using iron ore modified by K and Cu in chemical looping hydrogen generation

et al. 2018

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Recent Advances of Oxygen Carriers for Chemical Looping Reforming of Methane

et al. 2021

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This review discussed recent advances of oxygen carriers (OCs) for chemical looping reforming (CLR) of CH4 which aims to generate high‐quality syngas, an important chemical intermediate for the synthesis of chemicals and fuels. We firstly introduced CLR and that combined with CO2 and H2O splitting as well as clarified their advantages over conventional reforming processes. Then we reviewed the latest advances of metal‐based OCs, composite OCs including perovskites and hexaaluminates, and catalytic OCs, namely oxygen‐containing materials with catalytically metal sites, during the past five years. Specific discussion focused on the influence of composition, surface, and bulk structure of these OCs on conversion, selectivity, and lattice oxygen reactivity to summarize design and optimization strategies of the tailored OCs. Finally, a brief summary and an outlook on some of the scientific challenges and suggestions for future investigations on the development of outstanding OCs for CLR of CH4 are given.

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Pollution Control Meets Sustainability: Structure–Activity Studies on New Iron Oxide‐Based CO Oxidation Catalysts

Schoch

2016

ChemSusChem

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A new class of catalysts for the oxidation of CO based on iron oxide as a biocompatible, earth-abundant and non-toxic metal is presented. The catalytic activities achieved with these catalysts provide promising milestones towards the substitution of noble metals in CO oxidation catalysts. The catalysts can be obtained by using iron core-shell nanoparticle precursors. The metal used for the shell material determines whether the iron core is integrated in or isolated from the support. The active iron site is effectively integrated into the γ-Al2 O3 support if an aluminum shell is present in the core-shell precursor. When the metal used for the shell is different from the support, an isolated structure is formed. Using this directed synthesis approach, different iron oxide species can be obtained and their structural differences are linked to distinct catalytic activities, as demonstrated by combined in-depth analytical studies using XRD, X-ray absorption spectroscopy (XAS), UV/Vis, and Brunauer-Emmett-Teller (BET) analysis. The key species responsible for high catalytic activity is identified as isolated tetrahedrally coordinated Fe(III) centers, whereas aggregation leads to a reduction in activity.

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Development of MgAl₂O₄-stabilized, Cu-doped, Fe₂O₃-based oxygen carriers for thermochemical water-splitting

Abstract: The commercially dominating technology for hydrogen production (i.e. steam methane reforming) emits large quantities of CO2 into the atmosphere. On the other hand, thermochemical water-splitting cycles allow to produce high purity H2 while simultaneously capturing CO2.

Cited by 60 publications

References 34 publications

Inhibition of carbon deposition using iron ore modified by K and Cu in chemical looping hydrogen generation

Inhibition of carbon deposition using iron ore modified by K and Cu in chemical looping hydrogen generation

Recent Advances of Oxygen Carriers for Chemical Looping Reforming of Methane

Pollution Control Meets Sustainability: Structure–Activity Studies on New Iron Oxide‐Based CO Oxidation Catalysts

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