118748 20240319081025.0 doi 10.1016/j.fuproc.2022.107313 sideral 129701 ART-2022-129701 eng Zornoza, B. Universidad de Zaragoza (orcid)0000-0002-9934-1707 Evaluation of oxygen carriers based on manganese-iron mixed oxides prepared from natural ores or industrial waste products for chemical looping processes 2022 Access copy available to the general public Unrestricted Manganese-iron mixed oxides have been identified as promising oxygen carrier materials in chemical looping processes. In this work, low-cost raw materials are considered for the production of this type of oxygen carrier. Four manganese based minerals from deposits of different locations – South Africa, Gabon(x2) and Brazil – and two iron based materials (Fe-ore from Spain and Redmud waste) were used to prepare suitable oxygen carriers through a new two-step production method: a mixing-grinding (about 5 µm) pre-treatment followed by pelletizing, crushing and sieving to produce particles of the desired size (100–300 µm). This method was required in order to form the MnFe mixed oxide and to provide permanent magnetic properties, which were not found when the oxygen carriers were prepared by the classical one-step method, i.e. crushing and sieving of raw materials to the desired particle size (100–300 µm). The oxygen uncoupling capability of the developed materials was extremely low and even completely lost after repeated redox cycles. However, they were reactive under chemical looping conditions with H2, CO and CH4. Reactivity varied with the raw materials used and with the redox cycles, being of crucial importance for its evolution the intensity of the chemical stress during hundreds of redox cycles. © 2022 The Authors info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 7.5 2022 CHEMISTRY, APPLIED 8 / 72 = 0.111 2022 Q1 T1 ENGINEERING, CHEMICAL 18 / 141 = 0.128 2022 Q1 T1 ENERGY & FUELS 30 / 119 = 0.252 2022 Q2 T1 1.393 2022 Chemical Engineering (miscellaneous) 2022 Q1 Fuel Technology 2022 Q1 Energy Engineering and Power Technology 2022 Q1 12.5 2022 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Mendiara, T. (orcid)0000-0002-0042-4036 Abad, A. 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 234, 107313 (2022), [13 pp] Fuel process. technol. Fuel Processing Technology 0378-3820 3322136 http://zaguan.unizar.es/record/118748/files/texto_completo.pdf Versión publicada 2327278 http://zaguan.unizar.es/record/118748/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:118748 articulos driver 2024-03-18-16:35:55 ARTICLE