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Current thermochemical methods to generate H 2  include gasification and steam reforming of coal and natural gas, in which anthropogenic CO 2  emission is inevitable. If biomass is used as a source of H 2 , the process can be considered carbon-neutral. Seaweeds are among the less studied types of biomass with great potential because they do not require freshwater. Unfortunately, reaction pathways to thermochemically convert salty and wet biomass into H 2  are limited. In this study, a catalytic alkaline thermal treatment of brown seaweed is investigated to produce high purity H 2  with substantially suppressed CO 2  formation making the overall biomass conversion not only carbon-neutral but also potentially carbon-negative. High-purity 69.69 mmol-H 2 /(dry-ash-free)g-brown seaweed is produced with a conversion as high as 71%. The hydroxide is involved in both H 2  production and in situ CO 2  capture, while the Ni/ZrO 2  catalyst enhanced the secondary H 2  formation via steam methane reforming and water-gas shift reactions.

Alkaline thermal treatment of seaweed for high-purity hydrogen production with carbon capture and storage potential