Iron-based oxygen carriers in chemical looping conversions: A review

Yu, Zhongliang; Yang, Yanyan; Yang, Song; Zhang, Qian; Zhao, Jing‐Tai; Fang, Yitian; Hao, Xiaogang; Guan, Guoqing

doi:10.1016/j.crcon.2018.11.004

Cited by 161 publications

(95 citation statements)

References 168 publications

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“…This result was consistent with the reduction rate of Fe 2 O 3 in the different reductive gases. 19,34,35 It was noted that the NiO-iron ore had the lowest concentration of CO and H 2 , and the CuO-iron ore exhibited the lowest CH 4 concentration, indicating that the NiO-iron ore exhibited the highest selectivity toward CO and H 2 . The CuOiron ore had the highest selectivity toward CH 4 .…”

Section: Resultsmentioning

confidence: 99%

“…Natural iron ore, as one of the iron-based OCs, have been intensively studied in chemical looping processes due to their lower application cost. [19][20][21][22] In recent years, natural iron ores have been gradually applied to the CLH production process. Zeng et al 23 investigated the bio-oil CLH production process using an Austrian MAC iron ore as the OC.…”

Section: Introductionmentioning

confidence: 99%

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Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Xiao

et al. 2019

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Xiao

et al. 2019

RSC Adv.

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“…The CLC concept was first introduced by Richter and Knoche for heat integration with the utilization of metal oxides which acts as intermediates for the purpose of simultaneous power generation and CO 2 capture. In iron manufacturing, iron (Fe) performs as an oxygen carrier in the CLC while capturing pure CO 2 . One of the benefits of using CLC as a carbon capture technology (CCT) is the avoidance of the energy‐intensive gas separation process compared with other CCT .…”

Section: Introductionmentioning

confidence: 99%

“…In iron manufacturing, iron (Fe) performs as an oxygen carrier in the CLC while capturing pure CO 2 . 3 One of the benefits of using CLC as a carbon capture technology (CCT) is the avoidance of the energy-intensive gas separation process compared with other CCT. 4 CLC also offers the lowest carbon capture cost of 20 USD/tonCO 2 when compared with other CCT such as the oxycombustion capture (36-67 USD/tonCO 2 ), the precombustion capture (28-41 USD/tonCO 2 ), and the postcombustion capture (36-53 USD/tonCO 2 ).…”

Section: Introductionmentioning

confidence: 99%

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion

et al. 2020

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Summary Chemical‐looping combustion (CLC) provides a platform to generate energy streams while mitigating CO2 using iron oxide as a carrier of oxygen. Through the reduction process, iron oxide experiences phase transformation to ultimately produce metallic iron. To understand iron oxide reduction characteristics and optimally design the fuel reactor, kinetic and thermodynamic analyses were proposed, utilizing graphite. This study aims to evaluate the reduction behavior under the non‐isothermal process of various mixture ratios of hematite and graphite via thermogravimetric analysis with simultaneously evaluating evolved gases using a Fourier transform infrared spectrometer. The Coats‐Redfern model was employed to approximate the kinetic and thermodynamic parameters which assessed the different reaction mechanisms together with the distributed activation energy model (DAEM). The results revealed that the hematite‐to‐graphite ratio of 4:1 had the highest reduction degree and had three distinct peaks representing three iron oxide reduction phases. The zero‐order reaction mechanism agreed with the experimental results compared with other reaction models. The thermodynamic analysis showed an overall endothermic spontaneous reaction for the three phases which signified the direct reduction of the iron oxides. The DAEM result validated a stepwise reduction of iron oxides to metallic iron. The study aids the optimal design of the CLC fuel reactor for enhanced system performance.

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“…The objective of chemical looping gasification is to rely on a low-cost oxygen source and self-heating system, while producing high quality syngas. Iron oxide is one of the most studied solid oxygen carriers (Yu et al, 2019) while the concept of liquid chemical looping has only recently been proposed (Sarafraz et al, 2017a,b). It offers the major advantages of being a low-cost material with no environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Solar Biomass Gasification Combined With Iron Oxide Reduction for Syngas Production and Green Iron Metallurgy

et al. 2020

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The solar gasification of biomass with iron oxide for combined syngas and iron production was investigated. Both solar energy and biomass are promising renewable energies. The process of gasification converts solid carbonaceous feedstocks into either fuels or chemicals. However, conventional processes require partial combustion of the feedstock for energy supply and inherently suffer from high oxygen production costs and low syngas calorific value due to dilution with combustion products. Chemical looping gasification using solid oxides is an alternative option to tackle these issues. By supplying concentrated solar energy as the high-temperature heat source, it is possible to produce even more syngas from the process while enabling solar energy storage into dispatchable fuels. This work proposes to explore solar biomass gasification over iron oxide at high heating rates, representative of the conditions obtained in solar reactors. Thermodynamic equilibriums of gasification reactions between 100 and 1,500 • C were calculated and experimental results obtained at 1,100 • C with a specially designed induction furnace were reported for biomass gasification with iron oxide, water, or carbon dioxide as oxidizing agents. Solid products analysis showed that iron oxide can be reduced to metallic iron depending on the proportion of the oxygen carrier. These results indicate that iron oxide is an effective material for solar biomass gasification producing both syngas and iron via a novel green metallurgical process.

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Iron-based oxygen carriers in chemical looping conversions: A review

Cited by 161 publications

References 168 publications

Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion

Solar Biomass Gasification Combined With Iron Oxide Reduction for Syngas Production and Green Iron Metallurgy

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Iron-based oxygen carriers in chemical looping conversions: A review

Cited by 161 publications

References 168 publications

Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Chemical looping hydrogen production with modified iron ore as oxygen carriers using biomass pyrolysis gas as fuel

Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO2mitigation in chemical‐looping combustion

Solar Biomass Gasification Combined With Iron Oxide Reduction for Syngas Production and Green Iron Metallurgy

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Kinetic and thermodynamic analysis of iron oxide reduction by graphite for CO₂mitigation in chemical‐looping combustion