Biomass-Based Hydrogen Extraction and Accompanying Hazards-Review

Nowadays, there is an increased demand for energy, the access to which, however, is limited due to the decreasing of fossil sources and the need to reduce emissions, especially carbon dioxide. One possible remedy for this situation is using hydrogen as a source of green energy. Hydrogen is usually bound to other chemical elements and can be separated via energy-intensive few-step conversion processes. A few methods are involved in separating H₂ from biomass, including biological and thermochemical (TC) ones. Such methods and possible hazards related to them are reviewed in this study.