Iglesias-Vázquez, S.Valecillos, J.Remiro, AingeruElordi, GorkaAlique, D.Santos-Carballes, A.J.Sanz, R.Calles, J.A.Bilbao, J.Gayubo, A.G.2025-07-152025-07-152025-07-07Sergio Iglesias-Vázquez, José Valecillos, Aingeru Remiro, Gorka Elordi, David Alique, Alejandro J. Santos-Carballes, Raúl Sanz, José A. Calles, Javier Bilbao, Ana G. Gayubo, Steam reforming of bio-oil stabilized with ethanol over a Ni/MgAl2O4 catalyst in a Pd-membrane reactor, Catalysis Today, Volume 460, 2025, 115445, ISSN 0920-5861, https://doi.org/10.1016/j.cattod.2025.1154450920-5861https://hdl.handle.net/10115/92537A new membrane reactor (MR) has been used in the steam reforming (SR) of a feed of raw bio-oil stabilized with 25 wt% ethanol over a Ni/MgAl2O4 catalyst, comparing the results (yield of H2 and byproduct gases) to those reached in a conventional reactor (CR). The reaction setup involves two steps in series: a down-flow tube (at 500 ºC) for the vaporization of the feed and controlled removal of pyrolytic lignin (PL) from the oxygenates in the biooil, followed by an up-flow reactor provided with a composite Pd membrane supported on a porous stainless steel (PSS) tube containing a CeO2 intermediate layer (Pd/CeO2/PSS). In the MR configuration (with permeate pressure of 0.2 bar absolute), a H2 yield of 82 % was achieved at 550 ºC, space time of 2.8 h, S/C ratio of 1.55 and 3 bar in the retentate (reactor). This result significantly improves those reached in CR, even at 1 bar and 600 ºC. The S/C ratio in the feed must be limited in the MR configuration to avoid restrictions in H2 flux through the Pdmembrane caused by a higher gas dilution and concentration-polarization effect, as observed when the S/C ratio is increased up to 2.2. Similarly, a higher retentate pressure has a negative effect on the H2 yield due to its negative impact on the equilibrium of methane SR, that overcomes its benefits on the H2 permeation through the membrane. A promising performance of the membrane and catalyst has been obtained, thus demonstrating good prospects for their use in the sustainable production of H2 from lignocellulosic biomassenAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/hydrogensteam reformingPd membrane reactorBio-oilNi/MgAl2O4catalystArticle10.1016/j.cattod.2025.115445info:eu-repo/semantics/openAccess