(258b) Transportation Fuels from Renewable Hydrogen and Green Carbon Dioxide – a Technical, Economic, and Environmental Evaluation
In this contribution, we present a detailed technical, environmental, and economic evaluation of several pathways that are considered promising. This includes direct application of hydrogen in a fuel cell vehicle, as well as conversion of hydrogen and CO2 to combustion engine fuels like methane, methanol, and different methyl ethers, some of which can also be used as blend components with conventional fuels . The CO2 used is assumed to be obtained from biogas upgrading, where it occurs as a currently unused byproduct in high concentrations. Biogas upgrading is already being conducted at a number of operating biogas plants in order to obtain biomethane of higher purity . The pathways are evaluated with respect to their well-to-wheel efficiency, greenhouse gas emissions, and fuel cost. A technical analysis is conducted based on detailed process simulations in order to highlight what causes the differences in the performance of the different pathways, and an outlook is given on the potential for improved production processes.
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