Abstract
The objective of this study was to assess the scientific and engineering advancements of producing hydrogen from biomass via non-conventional processes. This article updates the developments of various hydrogen-production processes from biomass. Main studied non-conventional processes for hydrogen production from bioimass are redox process for biomass derived syngas conversion, hydrogen from biomass via concentrated solar radiation, microbial fermentation of biomass, and hydrogen from gasification of biomass via supercritical fluid extraction. The production of renewable hydrogen from biomass as a renewable resource requires a co-product strategy to compete with conventional production of hydrogen from the steam reforming of natural gas.