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First, this research illustrates the current types of molten salt mixtures, detailing their main applications and thermophysical properties. Then, the analysis delves into existing thermo-electrochemical cycles and their specific operating conditions for producing hydrogen and syngas. Moreover, this study assesses the compatibility of these processes with molten salt integration. This investigation involved a comprehensive review of the existing technical and scientific literature, blending insights and practical experiences to offer detailed data on the topics explored. The findings suggest that molten salts, with their medium\u2013high operating temperatures, can markedly improve the efficiency and sustainability of hydrogen and syngas production. Furthermore, this study outlines the pivotal role these technologies can play in achieving the European Union\u2019s ambitious goals by enhancing the use of renewable energy sources and advancing the shift to carbon-free solutions.<\/jats:p>","DOI":"10.3390\/app15126916","type":"journal-article","created":{"date-parts":[[2025,6,19]],"date-time":"2025-06-19T08:43:58Z","timestamp":1750322638000},"page":"6916","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Molten Salt Mixtures as an Energy Carrier for Thermochemical Processes of Renewable Gas Production: Review and Perspectives"],"prefix":"10.3390","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1239-4740","authenticated-orcid":false,"given":"Marco","family":"D\u2019Auria","sequence":"first","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5530-8983","authenticated-orcid":false,"given":"Anna Chiara","family":"Tizzoni","sequence":"additional","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5743-530X","authenticated-orcid":false,"given":"Francesco","family":"Rovense","sequence":"additional","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2242-7577","authenticated-orcid":false,"given":"Salvatore","family":"Sau","sequence":"additional","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]},{"given":"Luca","family":"Turchetti","sequence":"additional","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9412-3252","authenticated-orcid":false,"given":"Diogo","family":"Canavarro","sequence":"additional","affiliation":[{"name":"University of \u00c9vora\u2013Renewable Energies Chair, Polo da Mitra da Universidade de \u00c9vora, Edif\u00edcio \u00c1rio Lobo de Azevedo, Nossa Senhora da Tourega, 7000-083 \u00c9vora, Portugal"}]},{"given":"Jo\u00e3o","family":"March\u00e3","sequence":"additional","affiliation":[{"name":"University of \u00c9vora\u2013Renewable Energies Chair, Polo da Mitra da Universidade de \u00c9vora, Edif\u00edcio \u00c1rio Lobo de Azevedo, Nossa Senhora da Tourega, 7000-083 \u00c9vora, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7679-0200","authenticated-orcid":false,"given":"Pedro","family":"Horta","sequence":"additional","affiliation":[{"name":"University of \u00c9vora\u2013Renewable Energies Chair, Polo da Mitra da Universidade de \u00c9vora, Edif\u00edcio \u00c1rio Lobo de Azevedo, Nossa Senhora da Tourega, 7000-083 \u00c9vora, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2087-902X","authenticated-orcid":false,"given":"Michela","family":"Lanchi","sequence":"additional","affiliation":[{"name":"ENEA\u2014Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Via Anguillarese, 301, 00123 Rome, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2025,6,19]]},"reference":[{"key":"ref_1","unstructured":"(2024, June 11). 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