The Alkaline Thermal Treatment (ATr) of biomass is one of the few biomass conversion processes that has a potential for BECCS (bio-energy with carbon capture and storage).Combining in-situ carbon capture with H2 production creates a carbon-neutral process that has the potential to be carbon-negative.This study has shown that the conversion of cellulose to H2 with suppressed CO2 formation can be achieved through the reforming of gaseous intermediates in a fixed bed of Ca(OHh and 10％ Ni/ZrO2.Reforming occurs at low temperatures ≤773 K,which could allow for improved sustainability.