Abstract: The invention relates to reactor systems and processes for the production of synthesis gas (a mixture of carbon monoxide and hydrogen) from product gas of biomass gasification. A novel reformer catalyst reactor comprising two reaction zones, each operating at a different temperature with a different catalyst are disclosed. Processes for using the reformer catalyst reactor for the production of synthesis gas from process gas are also disclosed. The disclosed reformers and processes allow economical and highly efficient production of synthesis gas with reduced reliance on noble metal catalysts.