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Investigation of manganese-iron oxide materials based on manganese ores as oxygen carrier in chemical-looping with oxygen uncoupling (CLOU)

Nasim Mohammad Pour (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Golnar Azimi (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Henrik Leion (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Tobias Mattisson (Institutionen för energi och miljö, Energiteknik) ; Magnus Rydén (Institutionen för energi och miljö, Energiteknik) ; Anders Lyngfelt (Institutionen för energi och miljö, Energiteknik)
Energy Technology (2194-4296). Vol. 2 (2014), 5, p. 469-479.
[Artikel, refereegranskad vetenskaplig]

Oxygen carrier materials were synthesized using five different types of manganese ores with addition of iron oxide (Fe2O3), and they were investigated for their reactivity and properties in chemical looping with oxygen uncoupling (CLOU). Two different Mn/Fe molar ratios (1:2 and 2:1) were examined. The samples were manufactured by using a lab-scale extrusion method followed by sintering at 950 degrees C for 4 h. To measure their reactivity, the materials were exposed to gaseous CH4 and syngas (50:50 CO/H-2) as well as solid fuel (petroleum coke), in a batch fluidized-bed reactor. With CH4, the materials based on ores from Brazil and Gabon with a Mn/Fe molar ratio 2:1 showed the best reactivity. For reduction using syngas, samples based on Eastern European and South African ores provided higher amounts of oxygen equivalent, up to 3-5% of their mass. To investigate the ability of the samples to release gas-phase oxygen, solid fuel experiments using 0.1 g of petroleum coke in a bed of 10 g oxygen carrier were performed at 950 degrees C with Brazilian, Gabon, and Eastern European ores. In these solid fuel tests samples with a Mn/Fe molar ratio of 1:2 showed higher uncoupling rates. Based on X-ray diffraction analysis, the primary phase detected in all fresh particles was the oxidized form of MnyFe1-yOx, that is, bixbyite [(Mn,Fe)(2)O-3]. All of the particles showed sufficiently high crushing strength (> 2N) and a reasonable attrition resistance (attrition index < 6 wt% h(-1)). This suggests that the materials could be suitable for practical applications. It is concluded that the oxygen carriers made by manganese ores have the potential to be used as oxygen carriers for chemical-looping combustion and chemical looping with oxygen uncoupling.



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Denna post skapades 2014-02-28. Senast ändrad 2016-04-28.
CPL Pubid: 194281

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för energi och miljö, Energiteknik

Ämnesområden

Energi
Hållbar utveckling
Kemiteknik

Chalmers infrastruktur

 


Projekt

Denna publikation är ett resultat av följande projekt:


Novel combustion principle with inherent capture of CO2 using combined manganese oxides that release oxygen (NOCO2) (EC/FP7/291235)