Examinando por Autor "Santos-Carballés, A.J."

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Continuous flowing electroless pore-plating to fabricate H2-Selective Pd-Membranes
(Elsevier, 2025-07-26) Santos-Carballés, A.J.; Vizcaíno, A.J.; Sanz, R.; Calles, J.A.; Alique, D.
This study presents a novel approach to fabricating hydrogen-selective palladium membranes by continuous flowing electroless pore-plating, hereafter referred to as cf-ELP-PP. This procedure aims to significantly advance the manufacturing processes of dense membranes. In fact, the transition from traditional batch to continuous methods enhances production efficiency and membrane quality, thus being possible to reach improved hydrogen permeation capabilities. Particularly, these novel membranes exhibited a H2-permeance ranging between 3.29⋅10􀀀 4 and 4.77⋅10􀀀 4 mol m􀀀 2 s􀀀 1 Pa􀀀 0.5 with H2/N2 ideal separation factor greater than 10,000 for the entire set of experiments. This research also addresses key challenges related to the stability and efficiency of membranes, providing relevant insights for their operation during prolonged times even if unfavorable operating conditions are adopted. All these findings underscore the potential of cf-ELP-PP membranes for effective hydrogen purification in a wide variety of future industrial applications, aligning with the increasing demand for sustainable energy solutions. Moreover, the work also paves future enhancements in hydrogen production and separation processes by providing valuable insights for researchers in fields of materials science, chemical engineering, and renewable energy technologies.
Green hydrogen production by brewery spent grain valorization through gasification and membrane separation towards fuel-cell grade purity
(Elsevier, 2025-06-27) Alique, D.; Molina, G.; Maroño, M.; Santos-Carballés, A.J.; Sánchez-Hervás, J.M.; Ortíz, I.; Sanz, R.; Calles, J.A.; Martínez-Miguélez, A.; Navarro, C.
This study focuses on the potential valorization of brewers' spent grain (BSG) through gasification for ultra-pure green hydrogen production via membrane separation. First, a fundamental physicochemical characterization of BSG samples from two different Spanish brewing industries was conducted, revealing high energy content and good reproducibility of elemental composition, thus providing great potential for hydrogen generation in the context of circular economy for the brewery industry. The syngas composition reached by BSG gasification has been predicted and main operating conditions optimized to maximize the hydrogen yield (25–75 vol% air-steam mixture ratio, GR = 0.75, T = 800 °C and P = 5 bar). For gas purification, two Pd-membranes were fabricated by ELP-PP onto tubular PSS supports with high reproducibility (Pd-thickness in the range 8.22–8.75 μm), exhibiting an almost complete H2-selectivity, good fitting to Sieverts’ law and hydrogen permeate fluxes ranging from 175 to 550 mol m−2 h−1 under ideal gas feed composition conditions. The mechanical resistance of membranes was maintained at pressure driving forces up to 10 bar, thus highlighting their potential for commercialization and industrial application. Furthermore, long-term stability tests up to 75 h indicated promising membrane performance for continuous operation, offering valuable insights for stakeholders in the brewery industry to enhance economic growth and environmental sustainability through green hydrogen production from BSG.