{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,12]],"date-time":"2026-06-12T23:50:35Z","timestamp":1781308235671,"version":"3.54.1"},"reference-count":26,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2024,8,6]],"date-time":"2024-08-06T00:00:00Z","timestamp":1722902400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Ministry of Research, Innovation and Digitization, CNCS-UEFISCDI","award":["PN-III-P4-PCE-2021-0777"],"award-info":[{"award-number":["PN-III-P4-PCE-2021-0777"]}]},{"name":"Ministry of Research, Innovation and Digitization, CNCS-UEFISCDI","award":["PCE 5\/2022"],"award-info":[{"award-number":["PCE 5\/2022"]}]},{"name":"Ministry of Research, Innovation and Digitization, CNCS-UEFISCDI","award":["PNRR-C9-I8-760089\/23.05.2023"],"award-info":[{"award-number":["PNRR-C9-I8-760089\/23.05.2023"]}]},{"name":"Ministry of Research, Innovation and Digitization, CNCS-UEFISCDI","award":["COD CF31\/14.11.2022"],"award-info":[{"award-number":["COD CF31\/14.11.2022"]}]},{"name":"Ministry of Research, Innovation and Digitalization","award":["PN-III-P4-PCE-2021-0777"],"award-info":[{"award-number":["PN-III-P4-PCE-2021-0777"]}]},{"name":"Ministry of Research, Innovation and Digitalization","award":["PCE 5\/2022"],"award-info":[{"award-number":["PCE 5\/2022"]}]},{"name":"Ministry of Research, Innovation and Digitalization","award":["PNRR-C9-I8-760089\/23.05.2023"],"award-info":[{"award-number":["PNRR-C9-I8-760089\/23.05.2023"]}]},{"name":"Ministry of Research, Innovation and Digitalization","award":["COD CF31\/14.11.2022"],"award-info":[{"award-number":["COD CF31\/14.11.2022"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Processes"],"abstract":"<jats:p>The article examines the role of green hydrogen in reducing CO2 emissions in the transition to climate neutrality, highlighting both its benefits and challenges. It starts by discussing the production of green hydrogen from renewable sources and provides a brief analysis of primary resource structures for energy production in European countries, including Romania. Despite progress, there remains a significant reliance on fossil fuels in some countries. Economic technologies for green hydrogen production are explored, with a note that its production alone does not solve all issues due to complex and costly compression and storage operations. The concept of impure green hydrogen, derived from biomass gasification, pyrolysis, fermentation, and wastewater purification, is also discussed. Economic efficiency and future trends in green hydrogen production are outlined. The article concludes with an analysis of hydrogen-methane mixture combustion technologies, offering a conceptual framework for economically utilizing green hydrogen in the transition to a green hydrogen economy.<\/jats:p>","DOI":"10.3390\/pr12081651","type":"journal-article","created":{"date-parts":[[2024,8,6]],"date-time":"2024-08-06T11:54:19Z","timestamp":1722945259000},"page":"1651","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Green Hydrogen, a Solution for Replacing Fossil Fuels to Reduce CO2 Emissions"],"prefix":"10.3390","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-6657-1104","authenticated-orcid":false,"given":"Stoica","family":"Dorel","sequence":"first","affiliation":[{"name":"Department of Mechanics \u201cRadu P. 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Technol."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"24","DOI":"10.1016\/S1369-7021(03)00922-2","article-title":"Materials for hydrogen storage","volume":"6","year":"2003","journal-title":"Mater. Today"},{"key":"ref_21","first-page":"2286","article-title":"Chilled ammonia process evaluation for CO2 separation","volume":"81","author":"Slavu","year":"2019","journal-title":"UPB Sci. Bull. Ser. C"},{"key":"ref_22","doi-asserted-by":"crossref","unstructured":"Mihaescu, L., and Lazaroiou, G. (2018). New Efficient and Ecologic Energy Vectors, Solid Biomass-Hydrogen. Power Engineering, CRC Press.","DOI":"10.1201\/9781315202105-12"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"75","DOI":"10.1016\/S0360-3199(99)00009-9","article-title":"Rich flammability limits of fuel mixtures involving hydrogen at elevated temperatures","volume":"25","author":"Wierzba","year":"2000","journal-title":"Int. J. Hydrogen Energy"},{"key":"ref_24","doi-asserted-by":"crossref","unstructured":"Mitu, M., Razus, D., and Schroeder, V. (2021). Laminar Burning Velocities of Hydrogen-Blended Methane\u2013Air and Natural Gas\u2013Air Mixtures, Calculated from the Early Stage of p(t) Records in a Spherical Vessel. Energies, 14.","DOI":"10.3390\/en14227556"},{"key":"ref_25","first-page":"47","article-title":"The effect of Mn+2 doping ratio on the sensing properties of CoFe2O4 nanoparticles for CO2 and NH3 gases","volume":"82","author":"Jabbar","year":"2020","journal-title":"UPB Sci. Bull. Ser. B"},{"key":"ref_26","first-page":"127","article-title":"Economical and technical analysis of CO2 transport ways","volume":"74","author":"Norisor","year":"2012","journal-title":"UPB Sci. Bull. Ser. C Electr. 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