Iron-containing mixed-oxide composites as oxygen carriers for Chemical Looping with Oxygen Uncoupling (CLOU)

Shafiefarhood, Arya; Stewart, Amy Stieler; Li, Fanxing

doi:10.1016/j.fuel.2014.08.014

Cited by 62 publications

(56 citation statements)

References 42 publications

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“…The overall reaction of carbon in the fuel reactor with copper or manganese oxide is exothermic (Reactions 12-13) and the reaction with cobalt oxide is endothermic (Reaction 14) [43]. To date, great attention has been given to Cu-based and Mn-based materials mixed with Ca, Mg, Cu, Ni, Fe or Si [47,48,[57][58][59][60].…”

Section: Major Proposed Solid Fuel Chemical-looping Combustion Processesmentioning

confidence: 99%

Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review

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Means²,

Shekhawat

et al. 2015

Energies

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Chemical-looping technology is one of the promising CO2 capture technologies. It generates a CO2 enriched flue gas, which will greatly benefit CO2 capture, utilization or sequestration. Both chemical-looping combustion (CLC) and chemical-looping gasification (CLG) have the potential to be used to generate power, chemicals, and liquid fuels. Chemical-looping is an oxygen transporting process using oxygen carriers. Recently, attention has focused on solid fuels such as coal. Coal chemical-looping reactions are more complicated than gaseous fuels due to coal properties (like mineral matter) and the complex reaction pathways involving solid fuels. The mineral matter/ash and sulfur in coal may affect the activity of oxygen carriers. Oxygen carriers are the key issue in chemical-looping processes. Thermogravimetric analysis (TGA) has been widely used for the development of oxygen carriers (e.g., oxide reactivity). Two proposed processes for the CLC of solid fuels are in-situ Gasification Chemical-Looping Combustion (iG-CLC) and Chemical-Looping with Oxygen Uncoupling (CLOU). The objectives of this review are to discuss various chemical-looping processes with coal, summarize TGA applications in oxygen carrier development, and outline the major challenges associated with coal chemical-looping in iG-CLC and CLOU. OPEN ACCESSEnergies 2015, 8 10606

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Section: Major Proposed Solid Fuel Chemical-looping Combustion Processesmentioning

confidence: 99%

Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review

Ping

Means²,

Shekhawat

et al. 2015

Energies

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“…As a result, solid fuels are combusted with gaseous oxygen released from the oxygen carrier, resulting in significantly improved reaction kinetics. Typical oxygen carriers that exhibit CLOU properties include oxides and mixed oxides containing Cu, Mn, and/or Co [18][19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the relatively high cost of copper oxide may limit its applications. Cobalt oxides, while potentially feasible, are typically avoided due to their low decomposition temperature, toxicity, and negative environmental impact [18,23]. Manganese oxides hold advantages over copper oxides in terms of high availability and low cost.…”

Section: Introductionmentioning

confidence: 99%

“…However, pure manganese oxide is difficult to regenerate with air due to its high equilibrium P O2 . Formation of mixed oxide phases through the addition of secondary metal oxides such as Fe, Ni, Mg, and Ca to manganese oxides has been shown as an effective approach to improve the regenerability and structural stability of Mn based oxygen carriers [15,19,[21][22][23][24][25][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…More recently, perovskite structured oxygen carriers have received increasing attentions as oxygen carriers for redox applications [23,31,. Typical perovskite takes the form of ABO 3Àd , where A is a large cation of either the alkali earth or rare earth metal and B is a smaller transition metal cation [55].…”

Section: Introductionmentioning

confidence: 99%

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Ca1−A MnO3 (A = Sr and Ba) perovskite based oxygen carriers for chemical looping with oxygen uncoupling (CLOU)

et al. 2015

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h i g h l i g h t sSr and Ba are doped into the CaMnO 3 structure for enhanced phase stability and CLOU properties. Strontium dopant helps to prevent irreversible decomposition of the perovskite structure. Sr-doped oxygen carriers have CLOU capabilities at lower temperatures while being redox stable. Computational techniques, such as DFT, can potentially be used to guide oxygen carrier selection. a b s t r a c tOperated under a cyclic redox mode with an oxygen carrier, the chemical looping with oxygen uncoupling (CLOU) process offers the potential to effectively combust solid fuels while capturing CO 2 . Development of oxygen carriers capable of reversibly exchanging their active lattice oxygen (O 2À ) with gaseous oxygen (O 2 ) under varying external oxygen partial pressure (P O2 ) is of key importance to CLOU process performance. This article investigates the effect of A-site dopants on CaMnO 3 based oxygen carriers for CLOU. Both Sr and Ba are explored as potential dopants at various concentrations. Phase segregations are observed with the addition of Ba dopant even at relatively low concentrations (5% A-site doping). In contrast, stable solid solutions are formed with Sr dopant at a wide range of doping level. While CaMnO 3 perovskite suffers from irreversible change into Ruddlesden-Popper (Ca 2 MnO 4 ) and spinel (CaMn 2 O 4 ) phases under cyclic redox conditions, Sr doping is found to effectively stabilize the perovskite structure. In-situ XRD studies indicate that the Sr doped CaMnO 3 maintains a stable orthorhombic perovskite structure under an inert environment (tested up to 1200°C). The same oxygen carrier sample exhibited high recyclability over 100 redox cycles at 850°C. Besides being highly recyclable, Sr doped CaMnO 3 is found to be capable of releasing its lattice oxygen at a temperature significantly lower than that for CaMnO 3 , rendering it a potentially effective oxygen carrier for solid fuel combustion and carbon dioxide capture.

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Chemical Looping with Oxygen Uncoupling ( CLOU ) Processes

Whitty

Lighty

Mattisson

2018

Handbook of Chemical Looping Technology

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Iron-containing mixed-oxide composites as oxygen carriers for Chemical Looping with Oxygen Uncoupling (CLOU)

Cited by 62 publications

References 42 publications

Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review

Chemical-Looping Combustion and Gasification of Coals and Oxygen Carrier Development: A Brief Review

Ca1−A MnO3 (A = Sr and Ba) perovskite based oxygen carriers for chemical looping with oxygen uncoupling (CLOU)

Chemical Looping with Oxygen Uncoupling ( CLOU ) Processes

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