Silva, Carla Alexandra Monteiro daBento, Cláudia Sofia Vicente2024-03-042024-03-0420242023http://hdl.handle.net/10451/63138Tese de mestrado, Engenharia da Energia e Ambiente, 2023, Universidade de Lisboa, Faculdade de CiênciasHydrogen is a versatile and clean energy carrier that holds promise for a sustainable energy future. Steam methane reforming (SMR) and water electrolysis are two prominent pathways for hydrogen production. SMR can run on biogas instead of fossil natural gas, while water electrolysis, particularly proton exchange membrane (PEM) electrolysis, can rely on electricity from renewable energy sources. This study assesses these hydrogen production methods using a Life Cycle Assessment (LCA) approach, considering CO2eq emissions and demineralized water consumption. The Pedigree Matrix is employed to rank the quality of the results. DWSIM, a chemical processes simulation open-software is used in process simulation for the inventory of mass and energy flows. A sensitivity analysis is also performed to: SMR operating temperature, number of water-gas shift reactors, off-gas use as heat source, different IPCC (Intergovernmental Pannel on Climate Change) CO2 equivalency factors and different electricity generation mix. The findings contribute to a better understanding of hydrogen production from biogas by reforming in comparison to the other two methods by presenting higher needs of feedstock, intermediate water consumption and very low greenhouse gas (GHG) emissions.engReformação a vaporEletrólise da água PEMMatriz PedigreePrograma DWSIM código-abertoTeses de mestrado - 2024master thesis203882610