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oai:uvadoc.uva.es:10324/770102025-07-30T19:01:01Zcom_10324_1170com_10324_931com_10324_894col_10324_1367

Impact of hydrogen addition, up to 20 % (mol/mol), on the thermodynamic (p, ρ, T) properties of a reference high-calorific natural gas mixture with significant ethane and propane content Lozano Martín, Daniel Kipphardt, Heinrich Khanipour, Peyman Tuma, Dirk Horrillo Güemes, Alfonso Jesús Chamorro Camazón, César Rubén Hydrogen-enriched natural gas Gravimetric preparation Single-sinker densimeter High-pressure density Isothermal compressibility Reference equations of state Producción Científica Injecting hydrogen into the natural gas grid supports gradual decarbonization. To check the accuracy of equations of state for hydrogen-enriched natural gas mixtures, precise density data from well-characterized reference mixtures are essential. In a prior study, we provided experimental measurements for a natural gas constituted mainly of methane and for two derived hydrogen-enriched mixtures. In the present study, being the second and final part of our investigation, density measurements for a high-calorific natural gas with significant ethane and propane content, along with two hydrogen-enriched variants (10 and 20 mol-% hydrogen) are provided. The mixtures are gravimetrically prepared following ISO 6142-1. Density measurements, conducted with a single-sinker densimeter at temperatures from (260–350) K and pressures up to 20 MPa, are compared with three equations of state: AGA8-DC92, GERG-2008, and an improved GERG-2008. Results indicate that all models perform better for methane-dominant mixtures than for those containing heavier hydrocarbons. Programa Europeo de Metrología para la Innovación y la Investigación (EMPIR), ID de financiación: 10.13039/100014132, subvención n.º 19ENG03 MefHySto Junta de Castilla y León, el Ministerio de Ciencia e Innovación MCIN y el programa NextGenerationEU/PRTR de la Unión Europea, en el marco del proyecto C17.I01.P01.S21 2025-07-30T10:59:15Z 2025-07-30T10:59:15Z 2025 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion International Journal of Hydrogen Energy, 2025, vol. 140, p. 256-271 0360-3199 https://uvadoc.uva.es/handle/10324/77010 10.1016/j.ijhydene.2025.05.173 256 271 International Journal of Hydrogen Energy 140 eng https://www.sciencedirect.com/science/article/pii/S0360319925024413 Attribution-NonCommercial-NoDerivatives 4.0 Internacional info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2025 The Author(s) application/pdf Elsevier https://uvadoc.uva.es/bitstream/10324/77010/4/Impact-hydrogen-addition.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/4.0/ UVaDOC. Repositorio Documental de la Universidad de Valladolid https://uvadoc.uva.es/handle/10324/77010