Hydrothermal conversion of biomass to fuels and energetic materials
2013
Kruse, Andreas | Funke, Axel | Titirici, Maria-Magdalena
Available biomass, preferentially residues, can be divided in two groups: biomass with a high or natural water content (‘wet’ or ‘green’ biomass) and biomass with low water content such as wood and straw. In ‘dry’ biomass gasification processes, originating in most coal processing technologies, biomass of low water content is necessary to avoid the energy loss by water evaporation. In contrast, hydrothermal processes need water as reaction medium; therefore, these processes are preferentially used for wet or ‘green’ biomass. In this review paper we will describe the main research directions in the hydrothermal conversion of biomass into fuels and carbon throughout gasification to produce H₂ or CH₄, liquefaction to produce crude oils and phenols from lignin as well as carbonization to produce carbonaceous materials which can be either used as fuels (carbon negative chars) or interesting energetic materials (hydrothermal carbons).
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