Chemical looping reforming of methane using magnetite as oxygen carrier: Structure evolution and reduction kinetics

Lu, Chunqiang; Li, Kongzhai; Wang, Hua; Zhu, Xing; Wei, Yonggang; Zheng, Mianping; Zeng, Chunhua

doi:10.1016/j.apenergy.2017.11.049

Cited by 96 publications

(42 citation statements)

References 55 publications

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“…In addition to tons of CO2 generated [15] and release into the atmosphere by the reformer furnace flue gas. Thermodynamic constraints are also a major drawback of the process to date [16,17] requiring the process to be operated at high temperature, whilst medium-high pressures (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) bar) which thermodynamically limit the fuel conversion, have to be used to reduce plant size. Other challenges of the process include risk of coke formation, limited catalyst effectiveness and overall the efficiency of the process has reached its maximum [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The development of technologies such as membrane reactor [21][22][23][24][25] permit C-SR reaction at mild operating conditions suppressing the thermodynamic limitations [10]. Similarly, coupling of C-SR with chemical looping usually termed C CL-S' [13,[26][27][28][29][30] can minimise energy requirement, and sorption enhanced steam reforming (SE-SR) [31][32][33][34][35], as well as sorption enhanced chemical looping steam reforming (SE-CLSR) [6,[36][37][38][39][40][41][42] combine H2 production and CO2 capture in a single reactor enhancing H2 yield and purity compared to the conventional process, avoiding a separate water gas shift stage, and lowering the burden of H2 separation. Membrane assisted SR, CLSR, SESR and SE-CLSR are all part of the current efforts in process intensification of H2 production via reforming methods.…”

Section: Introductionmentioning

confidence: 99%

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Steam reforming of shale gas with nickel and calcium looping

Adiya

Dupont

Mahmud

2019

Fuel

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ReuseThis article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs (CC BY-NC-ND) licence. This licence only allows you to download this work and share it with others as long as you credit the authors, but you can't change the article in any way or use it commercially. More information and the full terms of the licence here: https://creativecommons.org/licenses/ TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. AbstractsHigh purity H2 production from shale gas using sorption enhanced chemical looping steam reforming (SE-CLSR) was investigated at 1 bar, GHSV 0.498 hr -1 , feed molar steam to carbon ratio of 3 and 650 for 20 reduction-oxidation-calcination cycles using CaO and 18 wt. % NiO on Al2O3 as sorbent and catalyst/oxygen carrier (OC) respectively. The shale gas feedstock was able to cyclically reduce the oxygen carrier and subsequently reform with high H2 yield and purity. For example H2 yield of 31 wt. % of fuel feed and purity of 92 % were obtained in the 4 th cycle during the pre-breakthrough period (prior to cycles with low sorbent capacity). This was equivalent to 80 and 43 % enhancement compared to the conventional steam reforming process respectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Steam reforming of shale gas with nickel and calcium looping

Adiya

Dupont

Mahmud

2019

Fuel

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“…The raw iron oxide particles from industrial residues, ores, or by‐products had been used as oxygen carriers because of the easy preparation, relatively low cost, and environmentally nontoxicity. However, it showed the relative low reactivity and the long‐term redox stability of which needs to be confirmed . The supported iron oxides such as Fe 2 O 3 /ZrO 2 , Fe 2 O 3 /MgAl 2 O 4 , and Fe 2 O 3 /CeO 2 or iron oxide composite of ZnFe 2 O 4 had been studied to enhance the reactivity.…”

Section: Results and Dicussionmentioning

confidence: 99%

“…However, it showed the relative low reactivity and the long-term redox stability of which needs to be confirmed. 44,45 The supported iron oxides such as and 10-vol% CH 4 , 40,46,47 CH 4 selectivity of the recycled ones was found to decrease because of the morphological changes. 40 For example, Fe 2 O 3 /CeO 2 exhibited high initial activity, and it notably deactivates as number of redox cycles mainly resulting from the formation of a stable CeFeO 3 perovskite phase.…”

Section: Reactivity Test In a Fixed-bed Reactormentioning

confidence: 96%

“…The reduction performances of other iron oxidebased oxygen carriers in the previous results are summarized in Table 4. 40,[44][45][46][47][48] The raw iron oxide particles from industrial residues, ores, or by-products had been used as oxygen carriers because of the easy preparation, relatively low cost, and environmentally nontoxicity. However, it showed the relative low reactivity and the long-term redox stability of which needs to be confirmed.…”

Section: Reactivity Test In a Fixed-bed Reactormentioning

confidence: 99%

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Redox reactivity of titania‐doped YSZ‐promoted iron‐based oxygen carrier over multiple redox cycles for chemical looping reforming of methane and hydrogen production

et al. 2020

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Summary Chemical looping using methane offers the potential for producing syngas or hydrogen with intrinsic separation of CO2. An ilmenite (FeTiO3)‐based oxygen carrier is a suitable oxygen carrier for methane oxidation because of good reactivity and low cost. However, it underwent a phase separation during repeated redox cycles, thereby resulting in the decrease in the reactivity. Therefore, it is necessary to develop a TiO2‐supported iron oxide composite with high redox stability and reactivity. In this study, we synthesize a titania‐doped YSZ (Y0.20Ti0.15Zr0.65O1.90)‐promoted iron‐based oxygen carrier. Inert material (ZrO2), pure ionic material (YSZ), and electronic conductive material (TiO2) are used as support materials for comparison. It is found that the Y0.20Ti0.15Zr0.65O1.90 promotes iron‐based oxygen carrier showed the best performance (27%/min to achieve 66% conversion) in methane oxidation in TGA experiment, high syngas selectivity in fixed bed reactor, and the redox stability over 100 redox cycles. Meanwhile, the other oxygen carriers show low reactivity and the morphological changes (iron oxide layer) and/or the phase decomposition (ie, YSZ → Y2O3 and ZrO2 and Fe2TiO5 → Fe2O3 and TiO2). The enhanced reactivity and stability are mainly ascribed to the mixed ionic‐electronic conductivity and the redox stability of titania‐doped YSZ in the single‐phase fluorite region.

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Chemical looping oxidation of CH₄ with 99.5% CO selectivity over V₂O₃‐based redox materials using CO₂ for regeneration

Wang

et al. 2019

AIChE Journal

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The main challenge of chemical looping dry reforming of methane (CLDRM) is the development of a high-performance redox material. In this study, V 2 O 3 was proved to be a unique redox material possessing high oxygen storage capacity (421.6 mg/g-V 2 O 3 , CH 4 consumption base) and strong carbon-deposition suppressing capability. It can be reduced to carbide by CH 4 , and the carbide can be reoxidized to V 2 O 3 with CO 2. Based on this redox cycle, CH 4 conversion with 99.5% CO selectivity coupled with efficient CO 2 splitting to CO was realized successively. However, the CH 4 conversion over pristine V 2 O 3 is low (<50%) and not stable, therefore catalytic activation of C-H bonds combined with structural modification of V 2 O 3 was carried out to accelerate the stoichiometric reactions and improve the redox stability. Finally, a maximum CH 4 conversion of 81.7% with stable performance during cycles was reached, and further investigation confirmed the series reaction mechanism and identified the rate-controlling step.

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Chemical looping reforming of methane using magnetite as oxygen carrier: Structure evolution and reduction kinetics

Cited by 96 publications

References 55 publications

Steam reforming of shale gas with nickel and calcium looping

Steam reforming of shale gas with nickel and calcium looping

Redox reactivity of titania‐doped YSZ‐promoted iron‐based oxygen carrier over multiple redox cycles for chemical looping reforming of methane and hydrogen production

Chemical looping oxidation of CH₄ with 99.5% CO selectivity over V₂O₃‐based redox materials using CO₂ for regeneration

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Chemical looping reforming of methane using magnetite as oxygen carrier: Structure evolution and reduction kinetics

Cited by 96 publications

References 55 publications

Steam reforming of shale gas with nickel and calcium looping

Steam reforming of shale gas with nickel and calcium looping

Redox reactivity of titania‐doped YSZ‐promoted iron‐based oxygen carrier over multiple redox cycles for chemical looping reforming of methane and hydrogen production

Chemical looping oxidation of CH4 with 99.5% CO selectivity over V2O3‐based redox materials using CO2 for regeneration

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Chemical looping oxidation of CH₄ with 99.5% CO selectivity over V₂O₃‐based redox materials using CO₂ for regeneration