Mn-doped Ca2Fe2O5 oxygen carrier for chemical looping gasification of biogas residue: Effect of oxygen uncoupling

Yan, Beibei; Liu, Zibiao; Wang, Jian; Ge, Yadong; Tao, Junyu; Cheng, Zhanjun; Chen, Guanyi

doi:10.1016/j.cej.2022.137086

Cited by 18 publications

(4 citation statements)

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“…Mn also increased the oxygen release via CLOU as could be expected from the detected CaMnO 3 using XRD. Mn‐doped into the structure of Ca 2 Fe 2 O 5 , similar to the known srebrodolskite phase in LD slag, 38 has also been shown to increase the oxygen release by CLOU due to improved oxygen diffusion in the material 39 . The addition of Ni into the structure did not coincide fully between the 2 wt.% sample and the 5 wt.% sample.…”

Section: Resultsmentioning

confidence: 95%

Metal impregnation on steel converter slag as an oxygen carrier

et al. 2023

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Oxygen carriers used in chemical looping processes operated with biofuel are affected by the inorganic matter of the fuel. It is therefore expected that the lifetime of the oxygen carrier is limited, and preferably low‐cost oxygen carriers should be used. Oxygen carriers based on iron ore or steel manufacturing waste products are available in significant quantities at low cost. However, it is common for these types of materials that their reactivity is low. This study investigates the effect of adding small amounts of more reactive elements into steel converter slag, also called LD slag.Slag particles were wet impregnated with 2 or 5 wt.% of Ni, Cu, Mn, or Ce. The new material's morphology was evaluated using X‐Ray Diffraction and SEM‐EDS. Changes in reactivity towards CO, CH4 and the model tar molecule benzene were evaluated using a bench‐scale laboratory fluidized bed reactor.It was observed that even small amounts of either Ni, Cu, or Mn could increase reactivity toward CO. Both Cu and Mn formed phases with LD slag that released oxygen via CLOU (chemical looping with oxygen uncoupling) and increased the conversion of methane and benzene. Ni and Ce doping also increased methane conversion but had only a minor effect on the benzene conversion. © 2023 The Authors. Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons Ltd.

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Section: Resultsmentioning

confidence: 95%

Metal impregnation on steel converter slag as an oxygen carrier

et al. 2023

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“…6,13,33 In addition, the peak located at 709.52 eV indicates that Fe 3+ is partially reduced to Fe 2+ , which emphasizes the presence of oxygen vacancies/defects in the CFO. 6,13,34 The sub-peaks of the Fe 2p spectrum of CFO@FC are marginally positively moved by 0.4 eV toward the high binding energy, signifying that the successful doping of the highly electronegative F atom has led to a reconfiguration of the electronic structure of CFO@FC, as illustrated in Fig. S6b (ESI†).…”

Section: Resultsmentioning

confidence: 97%

In situ construction of oxygen vacancy-rich and fluorine-doped carbon-coated Ca₂Fe₂O₅ for improved lithium storage performance

et al. 2023

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“…Furthermore, the energy dispersive spectrometer (EDS) elemental mappings (Figure S7 In this sense, it means that Al and Ga probably take the place of Co Oh 3+ , while Fe, Ni, and In are likely to occupy the tetrahedral sites. 36 The XPS spectra of Al 2p, Ga 2p, Fe 2p, and Ni 2p (Figure S12 and Table S7) show the monotonous valence states of Al 3+ , 37 Ga 3+ , 38 and the mixed valence states of Fe 3+ /Fe 2+ , 39 Ni 3+ / Ni 2+ . 40 This finding indicates that the doping elements of Fe, Ni, and In tend to have two different coordination.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tuning the d-Band Center of Co₃O₄ via Octahedral and Tetrahedral Codoping for Oxygen Evolution Reaction

Wu,

Shao,

Zhu

et al. 2024

ACS Catal.

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Promoting catalytic performance caused by d-band center modulation has been proven to play a crucial role in designing highly active spinel-based catalysts. Herein, two different geometrical configurations were adopted to modify the d-band center of Co 3 O 4 , in which monotonous replacement of octahedral cobalt sites by Al and Ga and dual regulation of octahedral and tetrahedral cobalt sites through the introduction of Fe, Ni, and In were accomplished, respectively. A volcanic diagram between the d-band center and the potential-determining step (PDS) energy barriers was determined through theoretical prediction consistent with the experimental results of catalytic performance. This work revealed that the conventionally perceived regulation of the octahedral configuration in Co 3 O 4 was insufficient to trigger an enhancement of performance. Still, the d-band center shift of Co sites caused by octahedral and tetrahedral collaborative modulation significantly decreased the energy barrier of the oxygen evolution reaction (OER).

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Mn-doped Ca2Fe2O5 oxygen carrier for chemical looping gasification of biogas residue: Effect of oxygen uncoupling

Cited by 18 publications

References 58 publications

Metal impregnation on steel converter slag as an oxygen carrier

Metal impregnation on steel converter slag as an oxygen carrier

In situ construction of oxygen vacancy-rich and fluorine-doped carbon-coated Ca₂Fe₂O₅ for improved lithium storage performance

Tuning the d-Band Center of Co₃O₄ via Octahedral and Tetrahedral Codoping for Oxygen Evolution Reaction

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Mn-doped Ca2Fe2O5 oxygen carrier for chemical looping gasification of biogas residue: Effect of oxygen uncoupling

Cited by 18 publications

References 58 publications

Metal impregnation on steel converter slag as an oxygen carrier

Metal impregnation on steel converter slag as an oxygen carrier

In situ construction of oxygen vacancy-rich and fluorine-doped carbon-coated Ca2Fe2O5 for improved lithium storage performance

Tuning the d-Band Center of Co3O4 via Octahedral and Tetrahedral Codoping for Oxygen Evolution Reaction

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In situ construction of oxygen vacancy-rich and fluorine-doped carbon-coated Ca₂Fe₂O₅ for improved lithium storage performance

Tuning the d-Band Center of Co₃O₄ via Octahedral and Tetrahedral Codoping for Oxygen Evolution Reaction