Thermodynamic Assessment of the Fe-Mn-O System

Kjellqvist, Lina; Selleby, Malin

doi:10.1007/s11669-009-9643-6

Cited by 59 publications

(53 citation statements)

References 90 publications

(134 reference statements)

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“…The oxygen partial pressure was set to 0.05 atm which would correspond to an expected outlet concentration of oxygen from the air reactor. The molar fraction of silica was set to 33%, which is the silica fraction of the examined oxygen carriers The calculated phase diagram is consistent with the phase diagram of the manganese-iron systems [22,24]. The dashed lines in the phase diagram represent the main effect of the presence of silica as it marks the transition to braunite.…”

Section: Combined Iron-manganese-silica Oxygen Carrierssupporting

confidence: 53%

“…Combined oxides of manganese and iron showed good oxygen carrier properties in TGA experiments [18] and combined oxides of manganese-iron, manganese-nickel and manganese-silica were operated in a batch fluidized reactor where manganese-iron materials showed both oxygen release behavior and good conversion of methane [19]. The thermodynamics of the system of iron oxide and manganese oxide have been examined in previous studies [20][21][22]. There are several more recent studies of combining manganese and iron to create better oxygen carriers for CLOU, both in a fluidized batch reactor [7,23,24] and in a circulating fluidized bed reactor [25].…”

Section: Combined Iron-manganese-silica Oxygen Carriersmentioning

confidence: 99%

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Combined oxides of iron, manganese and silica as oxygen carriers for chemical-looping combustion

Källén

Hallberg

Rydén

et al. 2014

Fuel Processing Technology

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Spray-dried particles with the chemical compositions of Fe 0.66 Mn 1.33 SiO 3 and FeMnSiO 3 have been examined as oxygen carrier materials for chemical-looping combustion. The performance of the materials was examined in oxygen release experiments and during fuel operation with natural gas and syngas. The experiments were carried out in a fluidized-bed chemical-looping reactor system designed for a thermal power of 300 W. The reactor system includes an air reactor and a fuel reactor, as well as loop seals and means for circulation of the oxygen carrier particles. Both materials were able to release gas phase oxygen in inert atmosphere at temperatures between 800-950°C, and with approximately equal oxygen concentrations. Fe 0.66 Mn 1.33 SiO 3 provided higher conversion of natural gas as compared to FeMnSiO 3 and the fuel conversion increased with temperature for both materials. During natural gas operation with Fe 0.66 Mn 1.33 SiO 3 the conversion reached 100% at around 950°C with a fuel reactor inventory of 235 kg/MW. The fuel conversion was improved when the solids inventory was increased; this improvement could especially be observed for FeMnSiO 3 as the fuel conversion was lower for this material. Fe 0.66 Mn 1.33 SiO 3 provided higher fuel conversion than FeMnSiO 3 also when syngas was used as fuel. The fuel conversion increased with temperature for both materials and full conversion was reached above 800°C with a fuel reactor inventory of 225 kg/MW for Fe 0.66 Mn 1.33 SiO 3 , while FeMnSiO 3 was incapable of providing full conversion. A rather large elutriation of fines and a significant change in particle size distribution could be observed during operation for both materials.Both materials could work as oxygen carrier for chemical-looping with oxygen uncoupling. Fe 0.66 Mn 1.33 SiO 3 would be preferred as it has higher conversion of both syngas and natural gas, but the attrition behavior of the material would need to be further investigated.

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Section: Combined Iron-manganese-silica Oxygen Carrierssupporting

confidence: 53%

Section: Combined Iron-manganese-silica Oxygen Carriersmentioning

confidence: 99%

Combined oxides of iron, manganese and silica as oxygen carriers for chemical-looping combustion

Källén

Hallberg

Rydén

et al. 2014

Fuel Processing Technology

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“…Fe þ 3 was later replaced by neutral FeO 1.5 species [6], resulting in the (Fe þ 2 ,) P (O -2 , FeO 1.5 , Va -Q ) Q formula unit of the solution. In this form the model was accepted by several authors and used to optimize higher-order systems [18][19][20].…”

Section: Liquidmentioning

confidence: 99%

Thermodynamic reevaluation of the Fe–O system

Hidayat

Shishin

Jak

et al. 2015

Calphad

115

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“…Combined oxides of manganeseiron, manganese-nickel and manganese-silicon have been operated in a batch fluidized reactor where manganese-iron materials showed both oxygen release behavior and good conversion of methane [15]. The thermodynamics of the system of iron oxide and manganese oxide have been examined in previous studies [16][17][18]. There are several recent studies of combining manganese and iron to create better oxygen carriers for CLOU, both in a fluidized batch reactor [19][20][21] and in a circulating fluidized bed reactor [22].…”

Section: Introductionmentioning

confidence: 99%