{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,25]],"date-time":"2026-04-25T18:43:37Z","timestamp":1777142617286,"version":"3.51.4"},"reference-count":246,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T00:00:00Z","timestamp":1772668800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia, I.P.","award":["UID\/05064\/2025"],"award-info":[{"award-number":["UID\/05064\/2025"]}]},{"name":"AIHRE project","award":["0093-AIHRE-6-E"],"award-info":[{"award-number":["0093-AIHRE-6-E"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clean Technol."],"abstract":"<jats:p>Renewable hydrogen purification is a critical yet often underemphasised step in enabling its use as a clean energy carrier. Hydrogen produced from biomass-based thermochemical and biological routes typically contains CO2, CO, CH4, H2S, and other impurities that must be removed to meet stringent requirements for fuel cell, industrial, and grid-injection applications. This review provides a critical and up-to-date assessment of renewable hydrogen purification technologies, focusing on their suitability for variable and impurity-rich renewable hydrogen streams. Established benchmark technologies, including pressure swing adsorption and cryogenic separation, are described, with emphasis on their operating principles, material innovations, and process integration strategies. Recent advancements in inorganic, polymeric, and mixed-matrix membranes are highlighted, with particular focus on how advanced porous materials enhance selectivity, permeability, and flexibility. Additionally, a comparative techno-economic assessment is presented, evaluating each purification method based on technology readiness level, capital and maintenance costs, energy efficiency, and operational lifespan. By incorporating recent research trends, this approach facilitates the selection and design of purification systems that are not only efficient and scalable but also cost-effective, tailored to both decentralised and centralised renewable hydrogen production.<\/jats:p>","DOI":"10.3390\/cleantechnol8020035","type":"journal-article","created":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T15:29:53Z","timestamp":1772724593000},"page":"35","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Recent Advances in Renewable Hydrogen Purification Technologies: A General Review"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8895-3938","authenticated-orcid":false,"given":"Jos\u00e9","family":"Rey","sequence":"first","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5733-902X","authenticated-orcid":false,"given":"Catarina","family":"Nobre","sequence":"additional","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6720-6132","authenticated-orcid":false,"given":"Bruna","family":"Rijo","sequence":"additional","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5734-7270","authenticated-orcid":false,"given":"Andrei","family":"Longo","sequence":"additional","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2581-4460","authenticated-orcid":false,"given":"Paulo","family":"Brito","sequence":"additional","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8836-089X","authenticated-orcid":false,"given":"Cecilia","family":"Mateos-Pedrero","sequence":"additional","affiliation":[{"name":"VALORIZA\u2014Research Center for Endogenous Resource Valorization, Portalegre Polytechnic University, Campus Polit\u00e9cnico 10, 7300-555 Portalegre, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2026,3,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"100827","DOI":"10.1016\/j.coche.2022.100827","article-title":"Seawater Electrolysis Technologies for Green Hydrogen Production: Challenges and Opportunities","volume":"36","author":"Gao","year":"2022","journal-title":"Curr. 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