2026-04-27T22:03:27Zhttps://uvadoc.uva.es/oai/request

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 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. 2025-07-30T10:59:15Z 2025-07-30T10:59:15Z 2025-07-30T10:59:15Z 2025 info:eu-repo/semantics/article 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 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ © 2025 The Author(s) Attribution-NonCommercial-NoDerivatives 4.0 Internacional Elsevier