This book presents current research in the study of the chemistry, processes and application of gasification processes. Topics discussed include experimental activities in a flexible gasification pilot plant; water gas shift and membrane reactor studies for the production of a hydrogen-rich stream in steam-oxygen gasification processes; the development of a dynamic model for a stratified downdraft wood gasifier; gasification of biomass for the production of syngas with reduced tar formation; the System Biomass Gasifier and its operation and the study of the catalytic effect of magnetite in the gasification of chars from lignite/rubber mixtures.