163001 20251009133841.0 doi 10.1016/j.fuel.2025.136698 sideral 145533 ART-2025-145533 eng Mercader, V.D. Universidad de Zaragoza (orcid)0000-0003-0395-0143 Intensifying synthetic natural gas production by functionalization of a NiFe/γ-Al2O3 catalyst with alkaline and alkaline-earth materials 2025 Access copy available to the general public Unrestricted This study demonstrates the influence of the functionalization method (Mechanical Mixture -MM- and Dual Function Materials -DFM-) of two CO2 adsorbent species (Na and Ca) in a catalytic fixed-bed reactor for CO2 methanation. The experiments consisted of cycles beginning with a CO2 adsorption stage followed by a methanation stage (with H2), interspersed with or without inert purge periods. The greatest enhancement in methane generation was observed in experiments with a mechanical mixture (MM) of NiFe/γ-Al2O3 catalyst and Na2O/γ-Al2O3. The methane production capacity was tested over a temperature range comprised between 200 and 400 °C, with values over 380 μmol/g obtained under moderate conditions (350 °C and pCO2 = 0.12 bar) and selectivity to methane close to 100 %. Since the ultimate goal is the methanation of the CO2 present in a biogas (without removing CH4), the potential effect of the presence of methane during the CO2 adsorption stages was also investigated. To achieve this task, a feed stream representative of a sweetened biogas coming from the anaerobic decomposition of municipal solid waste (MSW) (70 %v CH4 and 30 %v CO2) was used. The results showed no adverse effects along the successive cycles, paving the way to the use of these solids for biogas upgrading. On the other hand, the catalyst did not show a significant loss of activity after several hours of repetitive adsorption-methanation cycles. info:eu-repo/grantAgreement/ES/AEI/PID2022-136947OB-I00 info:eu-repo/grantAgreement/ES/DGA/T43-23R info:eu-repo/grantAgreement/ES/MICINN/PRE2020-095679 info:eu-repo/grantAgreement/ES/MICIU/PRTR-C17.I1 info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Sanz-Monreal, P. Universidad de Zaragoza (orcid)0009-0000-7836-8903 Durán, P. Universidad de Zaragoza (orcid)0000-0003-2898-1085 Aragüés-Aldea, P. Universidad de Zaragoza (orcid)0000-0001-6452-4258 Francés, E. Universidad de Zaragoza (orcid)0000-0003-3181-195X Herguido, J. Universidad de Zaragoza (orcid)0000-0003-1940-9597 Peña, J.A. Universidad de Zaragoza (orcid)0000-0002-8383-4996 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 5005 X Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Proy. investigación HKA 406, Part. A (2025), 136698 [11 pp.] Fuel Fuel 0016-2361 7341492 http://zaguan.unizar.es/record/163001/files/texto_completo.pdf Versión publicada 2512375 http://zaguan.unizar.es/record/163001/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:163001 articulos driver 2025-10-09-13:25:56 ARTICLE