Propulsion technologies have focused on monopropellant hydrazine systems for the past four decades. However, hydrazine is both highly toxic and highly flammable, requiring expensive cold storage and specialized handling and disposal protocols. Alternative propellant fuels for supporting satellites and spacecraft are required, and greener, on-demand approaches for manufacturing denser, less dangerous rocket fuels are essential. This project will ensure that humans in extreme environments such as space can sustainably access renewable fuel resources from biomass waste streams via continuous biocatalytic manufacturing using microfluidic reactor systems. Demonstration of our sustainable and recyclable processes for manufacturing greener propellants from biomass waste will advance further applications in future space missions. There remains a continued need to develop more sustainable, environmentally-responsible pathways for manufacturing fuels in general and propellants in particular. This project, building upon known biocatalytic processes, will provide astronauts with renewable propellant fuel sources that can be manufactured in situ. Thus, ?on-demand? access to propellants that perform more efficiently than hydrazine is enabled by this proposed work.