79135 20210126093424.0 doi 10.1016/j.ijhydene.2018.04.151 sideral 106566 ART-2019-106566 eng (orcid)0000-0001-8327-7256 Lachén, J. Universidad de Zaragoza Production and purification of hydrogen by biogas combined reforming and steam-iron process 2019 Access copy available to the general public Unrestricted Cobalt ferrite and hematite with minor additives have been tested for production and purification of high purity hydrogen from a synthetic biogas by steam-iron process (SIP) in a fixed bed reactor. A catalyst based in nickel aluminate has been included in the bed of solids to enhance the rate of the reaction of methane dry reforming (MDR). The reductants resulting from MDR are responsible for reducing the oxides based on iron that will, in the following stage, be oxidized by steam to release hydrogen with less than 50 ppm of CO. Coke minimization along reduction stages forces to operate such reactors above 700 °C for reductions, and as low as 500 °C for oxidations to avoid coke gasification. To avoid problems such as reactor clogging by coke in reductions and/or contamination of hydrogen by gasification of coke along oxidations, steam in small proportions has been included in the feed with the aim of minimizing or even avoiding formation of carbonaceous depositions along the reduction stage of SIP. Since steam is an oxidant, it exerts an inhibiting effect upon reduction of the oxide, that slows down the efficiency of the process. It has been proved that co-feeding low proportions of steam with an equimolar mixture of CH4 and CO2 (simulating a poor heating value desulphurized biogas) is able to avoid coke deposition, allowing the operation of both, reductions and oxidations, in isothermal regime (700 °C). Empirical results have been contrasted with data found in literature for similar processes based in MDR and combined (or mixed) reforming process (CMR), concluding that the combination of MDR + SIP proposed in this work, taking apart economic aspects and complex engineering, shows similar yields towards hydrogen, but with the advantage of not requiring a subsequent purification process. info:eu-repo/grantAgreement/ES/DGA/FSE info:eu-repo/grantAgreement/ES/MINECO/BES-2014-067984 info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-77277-R info:eu-repo/grantAgreement/ES/MINECO/ENE2013-44350-R info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 4.939 2019 ELECTROCHEMISTRY 7 / 27 = 0.259 2019 Q2 T1 ENERGY & FUELS 30 / 112 = 0.268 2019 Q2 T1 CHEMISTRY, PHYSICAL 48 / 159 = 0.302 2019 Q2 T1 1.141 2019 Condensed Matter Physics 2019 Q1 Energy Engineering and Power Technology 2019 Q1 Fuel Technology 2019 Q1 Renewable Energy, Sustainability and the Environment 2019 Q2 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion (orcid)0000-0003-1940-9597 Herguido, J. Universidad de Zaragoza (orcid)0000-0002-8383-4996 Peña, J.A. Universidad de Zaragoza 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 44, 35 (2019), 19244-19254 Int. j. hydrogen energy International Journal of Hydrogen Energy 0360-3199 1105879 http://zaguan.unizar.es/record/79135/files/texto_completo.pdf Postprint 94877 http://zaguan.unizar.es/record/79135/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:79135 articulos driver 2021-01-26-09:30:57 ARTICLE