La1−xSrxMyFe1−yO3−δ perovskites as oxygen-carrier materials for chemical-looping reforming |
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Authors: | Lori Nalbandian Antigoni Evdou Vassilis Zaspalis |
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Affiliation: | a Laboratory of Inorganic Materials, Chemical Process Engineering Research Institute, Center for Research and Technology-Hellas (CERTH), 6th klm. Harilaou-Thermi Rd, P.O. Box 60361 Thermi, 57001 Thessaloniki, Greece |
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Abstract: | The use of perovskites with the general formula La1?xSrxMyFe1?yO3 (M = Ni, Co, Cr, Cu) as oxygen carriers for syngas generation from methane by Chemical Looping Reforming is investigated in the present work. The experimental study concerns the oxidation of a fuel, using the oxygen from a solid oxygen carrier, instead of oxygen from air. Subsequent oxidation of the reduced solid is performed either with gaseous oxygen or with water. In the latter case additional hydrogen is produced, which is very pure and therefore appropriate to be used in fuel cell applications. The performance of the candidate materials is ranked by taking into account the hydrogen and carbon monoxide yields during the fuel oxidation step as well as the amount of oxygen per mole solid (δ) that can be delivered reversibly to the fuel. The effect of the materials composition and of NiO addition is examined. The best performance was obtained with the La0.7Sr0.3Cr0.1Fe0.9O3 sample mixed with 5% NiO. The H2 yield was up to 90%. |
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Keywords: | Perovskites Oxygen-carrier materials Chemical-looping reforming Dense membrane reactor |
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