117376 20251204145007.0 doi 10.3390/su13168939 sideral 127069 ART-2021-127069 eng Di Stasi C. Universidad de Zaragoza (orcid)0000-0001-5266-398X Wheat-straw-derived activated biochar as a renewable support of Ni-CeO2 catalysts for CO2 methanation 2021 Access copy available to the general public Unrestricted Ceria-and urea-doped activated biochars were used as support for Ni-based catalysts for CO2 methanation purposes. Different materials were prepared and tested to find the best catalytic formulation. After several CO2 methanation experiments—carried out at 0.35–1.0 MPa and 300–500¿C—it was found that the most suitable catalyst was a wheat-straw-derived activated biochar loaded with 30 wt.% of CeO2 and 20 wt.% of Ni. Using this catalyst, a CO2 conversion of 65% with a CH4 selectivity of 95% was reached at 1.0 MPa, 400¿C, and 13, 200 h-1 . From the study of the influence of the gas hourly space velocity, it was deduced that the most likely reaction mechanism was a reverse water–gas shift reaction, followed by CO hydrogenation. N-doping of the carbon support as an alternative to the use of ceria was also investigated. However, both CO2 conversion and selectivity toward CH4 values were clearly lower than those obtained for the ceria-containing catalyst cited above. The outcomes of this work indicate that a renewable biomass-derived support can be effectively employed in the catalytic conversion of CO2 to methane. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. info:eu-repo/grantAgreement/ES/DGA-FEDER-FSE 2014–2020/E14-17R info:eu-repo/grantAgreement/ES/DGA-FEDER/T22-20R info:eu-repo/grantAgreement/EC/H2020/721991/EU/Advanced Carbon Materials from Biowaste: Sustainable Pathways to Drive Innovative Green Technologies/ GreenCarbon This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 721991- GreenCarbon info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es 3.889 2021 ENVIRONMENTAL SCIENCES 133 / 279 = 0.477 2021 Q2 T2 ENVIRONMENTAL STUDIES 57 / 128 = 0.445 2021 Q2 T2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY 35 / 47 = 0.745 2021 Q3 T3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY 7 / 9 = 0.778 2021 Q4 T3 0.664 2021 Energy Engineering and Power Technology 2021 Q1 Renewable Energy, Sustainability and the Environment 2021 Q1 Management, Monitoring, Policy and Law 2021 Q1 Geography, Planning and Development 2021 Q1 5.0 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Renda S. (orcid)0000-0002-5926-5252 Greco G. Universidad de Zaragoza (orcid)0000-0001-6609-1601 González B. (orcid)0000-0001-7125-4997 Palma V. Manyà J.J. Universidad de Zaragoza (orcid)0000-0002-0118-3254 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 13, 16 (2021), 8939 [13 pp] Sustainability (Basel) Sustainability (Switzerland) 2071-1050 3246793 http://zaguan.unizar.es/record/117376/files/texto_completo.pdf Versión publicada 2676504 http://zaguan.unizar.es/record/117376/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:117376 articulos driver 2025-12-04-14:45:26 ARTICLE