Improvement of Process Conditions for H 2 Production by Chemical Looping Reforming

Alba Storione, Mattia Boscherini, Francesco Miccio (), Elena Landi, Matteo Minelli and Ferruccio Doghieri
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Alba Storione: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via Terracini 28, 40131 Bologna, Italy
Mattia Boscherini: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via Terracini 28, 40131 Bologna, Italy
Francesco Miccio: Institute of Science, Technology and Sustainability for Ceramics (ISSMC), National Research Council of Italy (CNR), Via Granarolo, 64, 48018 Faenza, Italy
Elena Landi: Institute of Science, Technology and Sustainability for Ceramics (ISSMC), National Research Council of Italy (CNR), Via Granarolo, 64, 48018 Faenza, Italy
Matteo Minelli: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via Terracini 28, 40131 Bologna, Italy
Ferruccio Doghieri: Department of Civil, Chemical, Environmental and Materials Engineering (DICAM), Alma Mater Studiorum, University of Bologna, Via Terracini 28, 40131 Bologna, Italy

Energies, 2024, vol. 17, issue 7, 1-22

Abstract: A syngas production process was studied cyclically, exploiting the redox properties of Ce-based oxygen carriers. The two steps of the looping cycle were investigated through thermogravimetric analysis and fixed bed experiments. While TGA experiments were focused on the identification of the optimal temperatures ranges for methane partial oxidation (900–1000 °C) and carrier regeneration (400–900 °C), fixed bed testing was performed isothermally (at 900 or 950 °C), with a 10% CH 4 feed stream in N 2 to investigate material stability and cyclic performance reproducibility. The effect of the process times on carbon deposition, specific syngas yields, and selectivity was inspected, together with the investigation of best conditions to fully regenerate the carrier, adjust the syngas final ratio, and to ensure stable performances. The obtained results ensured the possibility to work in fully isothermal operations, with CH 4 conversion of up to 38% and specific yields of syngas per mass of O 2 carrier between 4.0–6.8 mmol∙g −1 , preserved even across cycles, thus paving the path to the development of alternative and effective processes for syngas production. Under the operating conditions of the lab-scale experiment, an effective reforming time was 20 min, corresponding to 1.16 times of the characteristic time of reaction kinetics at 950 °C.

Keywords: reforming; chemical looping; cerium dioxide; process optimization; syngas (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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