Phase transition of Fe2O3–NiO to NiFe2O4 in perovskite catalytic particles for enhanced methane chemical looping reforming-decomposition with CO2 conversion

Lim, Hyun Suk; Kang, Dong‐oh; Lee, Jae Woo

doi:10.1016/j.apcatb.2016.09.020

Cited by 109 publications

(48 citation statements)

References 44 publications

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“…Due to its low price and non-toxicity, Fe is advantageous from an economic and environmental point of view compared to Ni. Aiming to combine the complementary advantages of these two constituent metals, many efforts have been made to develop bimetallic Fe-Ni oxygen carriers via two different main strategies, physical [108,133] and chemical [23,108,109,110,111,112] mixing. Johansson et al [133] reported that the addition of only 3 wt % NiO in the bed of a Fe-based oxygen carrier was sufficient to reach a very high CH 4 conversion in CLC process.…”

Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

“…In the case of chemically mixed oxygen carriers, in which the NiFe 2 O 4 spinel usually forms, the CH 4 conversion and reaction rate in CLC process follow the ranking: NiO > NiFe 2 O 4 > Fe 2 O 3 [109], further indicating that alloying a less reactive metal—Fe—with a highly reactive one—Ni—can significantly improve the activity of the resulting bimetallic oxygen carrier. Compared to pure NiO and Fe 2 O 3 , NiFe 2 O 4 is more suitable to serve as oxygen carrier for the CLR process, because the limited oxygen transfer capacity of NiFe 2 O 4 avoids the complete oxidation of CH 4 , which results in an increased selectivity to syngas [112]. Alternatively, the addition of small amount of Fe into a Ni-based oxygen carrier or catalyst can obviously enhance the carbon resistance.…”

Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

“…This ferrite-based material is readily prepared via co-precipitation of all elements, unlike the additional modification of a Fe-based oxygen carrier by a catalyst component. Various Me-ferrites (Me = Ni, Co, Cu, Mn, Zn) have been investigated in chemical looping processes [112,150,151], among which the NiFe 2 O 4 and CoFe 2 O 4 show certain catalytic activity and redox stability during chemical looping dry reforming of CH 4 . Given the increase of alcohol feedstocks from chemical conversion of biomass, these ferrite-based bifunctional materials were further tested in chemical looping reforming of alcohol fuels, such as methanol and ethanol, for the production of value added fuels such as syngas.…”

Section: Bifunctional Materials For Catalyst-assisted Chemical Loomentioning

confidence: 99%

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Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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Combining chemical looping with a traditional fuel conversion process yields a promising technology for low-CO2-emission energy production. Bridged by the cyclic transformation of a looping material (CO2 carrier or oxygen carrier), a chemical looping process is divided into two spatially or temporally separated half-cycles. Firstly, the oxygen carrier material is reduced by fuel, producing power or chemicals. Then, the material is regenerated by an oxidizer. In chemical looping combustion, a separation-ready CO2 stream is produced, which significantly improves the CO2 capture efficiency. In chemical looping reforming, CO2 can be used as an oxidizer, resulting in a novel approach for efficient CO2 utilization through reduction to CO. Recently, the novel process of catalyst-assisted chemical looping was proposed, aiming at maximized CO2 utilization via the achievement of deep reduction of the oxygen carrier in the first half-cycle. It makes use of a bifunctional looping material that combines both catalytic function for efficient fuel conversion and oxygen storage function for redox cycling. For all of these chemical looping technologies, the choice of looping materials is crucial for their industrial application. Therefore, current research is focused on the development of a suitable looping material, which is required to have high redox activity and stability, and good economic and environmental performance. In this review, a series of commonly used metal oxide-based materials are firstly compared as looping material from an industrial-application perspective. The recent advances in the enhancement of the activity and stability of looping materials are discussed. The focus then proceeds to new findings in the development of the bifunctional looping materials employed in the emerging catalyst-assisted chemical looping technology. Among these, the design of core-shell structured Ni-Fe bifunctional nanomaterials shows great potential for catalyst-assisted chemical looping.

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Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

Section: Improvements To Oxygen Carriersmentioning

confidence: 99%

Section: Bifunctional Materials For Catalyst-assisted Chemical Loomentioning

confidence: 99%

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Advanced Chemical Looping Materials for CO2 Utilization: A Review

Galvita

Poelman

et al. 2018

Materials

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“…Recently, the chemical looping process using CO 2 as the oxidant has become highly attractive due to the serious global environmental problems caused by large CO 2 emissions . In 2011, Najera et al extended chemical looping combustion (CLC) and proposed chemical looping dry reforming (CLDR, Figure a) by replacing air with CO 2 as the oxidant.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the CL‐POM performance is also affected by the redox process. Lim et al revealed that the phase transition from the biphasic Fe 2 O 3 ‐NiO to the single crystal phase of NiFe 2 O 4 enhanced the oxygen carrying capacity and activated more lattice oxygen to participate in the synthesis gas production. Dai et al and Mihai et al found that the lattice oxygen in perovskite was highly selective to synthesis gas, which was preferentially recovered during the air re‐oxidation progress.…”

Section: Introductionmentioning

confidence: 99%

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant

et al. 2017

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in Wiley Online Library (wileyonlinelibrary.com)Chemical looping partial oxidation of methane using a sole CO 2 oxidant (CL-POM-CO 2 ) is an emerging technology for synthesis gas generation and CO 2 utilization, which is highly dependent on an oxygen carrier (OC). In this work, Fe-substituted La-hexaaluminate as the OC was found to exhibit good reactivity and stability during 50 periodic CH 4 / CO 2 redox cycles due to the formation of magnetoplumbite La-hexaaluminate structure with the introduction of La. Deeper reduction for synthesis gas generation did not destroy the La-hexaaluminate structure via a charge compensation mechanism, which increased CH 4 reactivity and further improved CO 2 utilization under subsequent re-oxidation. In the La-hexaaluminate structure, O 6 -Fe 31 (Oh) was highly active for the total oxidation of methane, while O 5 -Fe 31 (Tr) and O 4 -Fe 31 (Th) selectively oxidized CH 4 to synthesis gas. The sole CO 2 oxidant only selectively recovered O 5 -Fe 31 (Tr) and O 4 -Fe 31 (Th), and thus is more favorable for improving synthesis gas selectivity than O 2 /air, which offers an attractive opportunity for CO 2 utilization.

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Insight in kinetics from pre‐edge features using time resolved in situ XAS

et al. 2017

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The kinetics of reduction of a 10 wt %Fe2O3‐MgAl2O4 spinel were investigated using XRD and time resolved Fe‐K QXANES. The Rietveld refinement of the XRD pattern showed the replacement of Al with Fe in the spinel structure and the formation of MgFeAlOx. The XANES pre‐edge feature was employed to study the reduction kinetics during H2‐TPR (Temperature Programmed Reduction) up to 730°C. About 55% of the Fe3+ in MgFeAlOx was reduced to Fe2+. A shrinking core model, which takes into account both solid‐state diffusion via an oxygen diffusion coefficient, and gas‐solid reaction through a reaction rate coefficient, was applied. The activation energy for chemical reaction showed a linear dependence on the conversion, increasing from 104 to 126 kJ/mol over the course of material reduction. The good accordance between the shrinking core model description and the experimental data indicates that XANES pre‐edge features can be used to correlate changes in material structure and reaction kinetics. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1339–1349, 2018

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Phase transition of Fe2O3–NiO to NiFe2O4 in perovskite catalytic particles for enhanced methane chemical looping reforming-decomposition with CO2 conversion

Cited by 109 publications

References 44 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant

Insight in kinetics from pre‐edge features using time resolved in situ XAS

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Phase transition of Fe2O3–NiO to NiFe2O4 in perovskite catalytic particles for enhanced methane chemical looping reforming-decomposition with CO2 conversion

Cited by 109 publications

References 44 publications

Advanced Chemical Looping Materials for CO2 Utilization: A Review

Advanced Chemical Looping Materials for CO2 Utilization: A Review

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO2 as Sole Oxidant

Insight in kinetics from pre‐edge features using time resolved in situ XAS

Contact Info

Product

Resources

About

La‐hexaaluminate for synthesis gas generation by Chemical Looping Partial Oxidation of Methane Using CO₂ as Sole Oxidant