Intensifying synthetic natural gas production by functionalization of a NiFe/γ-Al2O3 catalyst with alkaline and alkaline-earth materials

Mercader, V.D. (Universidad de Zaragoza) ; Sanz-Monreal, P. (Universidad de Zaragoza) ; Durán, P. (Universidad de Zaragoza) ; Aragüés-Aldea, P. (Universidad de Zaragoza) ; Francés, E. (Universidad de Zaragoza) ; Herguido, J. (Universidad de Zaragoza) ; Peña, J.A. (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.1016/j.fuel.2025.136698

Año: 2025

Publicado en: Fuel 406, Part. A (2025), 136698 [11 pp.]
ISSN: 0016-2361

Financiación: info:eu-repo/grantAgreement/ES/AEI/PID2022-136947OB-I00
Financiación: info:eu-repo/grantAgreement/ES/DGA/T43-23R
Financiación: info:eu-repo/grantAgreement/ES/MICINN/PRE2020-095679
Financiación: info:eu-repo/grantAgreement/ES/MICIU/PRTR-C17.I1

Tipo y forma: Article (Published version)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)
Área (Departamento): Proy. investigación HKA (Dpto. Ing.Quím.Tecnol.Med.Amb.)