Supercritical water-based catalytic gasification of wet biomass for hydrogen production converts low-energy density but renewable biomass energy into high-energy density, storable, and transportable clean energy hydrogen. It features a benign circular process throughout, hence presenting favorable economic prospects and environmental advantages. This article provides a comprehensive review of domestic and international research advancements in supercritical water-based biomass catalytic gasification and analyzes the main influencing factors for producing hydrogen-rich gases in a supercritical water environment, proposing further research directions.
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