150626 20251017144551.0 doi 10.1016/j.cattod.2019.06.022 sideral 116217 ART-2020-116217 eng Bueno-Alejo, Carlos J. (orcid)0000-0002-8762-6203 LED-driven continuous flow carbon dioxide hydrogenation on a nickel-based catalyst 2020 Access copy available to the general public Unrestricted Methane can be obtained from the direct hydrogenation of CO2 via the Sabatier reaction. This reaction is usually performed at high temperatures and/or pressures but it has been recently reported that in the presence of certain nanostructured catalysts, CO2 methanation can proceed at lower temperatures in solar photo-assisted processes. In this study, an inexpensive and commercially available nickel-based catalyst (Ni/Al2O3·SiO2) has been selected to perform the continuous CO2 hydrogenation in a fixed bed photocatalytic reactor using high-radiance/low consumption light emitting diodes (LEDs). These illumination conditions allowed us to attain the reaction temperatures required without the need of additional heating sources. Different LED excitation wavelengths and irradiances were evaluated. Under selected irradiation conditions (460 nm wavelength) not only the photothermal but also the photo-catalytic conversion of CO2 into CH4 takes place, with high selectivity. Conversion levels above 70% with production rates of ca. 35 mmol CH4 g−1 h-1 were obtained, outperforming the results obtained by conventional heating methods or with other irradiation wavelengths. info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-79419-R info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es 6.766 2020 CHEMISTRY, APPLIED 10 / 74 = 0.135 2020 Q1 T1 ENGINEERING, CHEMICAL 19 / 143 = 0.133 2020 Q1 T1 CHEMISTRY, PHYSICAL 36 / 162 = 0.222 2020 Q1 T1 1.397 2020 Chemistry (miscellaneous) 2020 Q1 Catalysis 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Arca-Ramos, Adriana Hueso, José L (orcid)0000-0002-4546-4111 Santamaria, Jesús Universidad de Zaragoza (orcid)0000-0002-8701-9745 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 355 (2020), 678-684 Catal. today Catalysis Today 0920-5861 4558226 http://zaguan.unizar.es/record/150626/files/texto_completo.pdf Postprint 1308862 http://zaguan.unizar.es/record/150626/files/texto_completo.jpg?subformat=icon icon Postprint oai:zaguan.unizar.es:150626 articulos driver 2025-10-17-14:11:58 ARTICLE