Biofuels from Biomass

Faced with the rapid depletion of fossil fuel reserves and the growth of the global economy, there is a need for energy sources that are not only sustainable but also ecologically viable. In this context, biofuels emerge as a promising alternative, obtained from biomass from different sources, such as agricultural, forest, industrial, and urban residues. Its use can not only complement but also replace traditional fossil fuels, resulting in a significant reduction in carbon emissions and contributing to mitigating dependence on limited resources in the long term. This versatility of biomass makes it a versatile energy source, which can be directly used through combustion or transformed by biochemical, chemical, and thermochemical processes into different types of biofuels. In this sense, the main objective of this chapter is to shed light on the breadth of diversity of terrestrial, aquatic, and residual biomass, the production technologies used to produce biofuels, in addition to the availability of these, classified according to their nature. For that, a descriptive qualitative methodology was used. By tracing a historical overview, it was found that, from ancient times to the present, biomass played a vital role in everyday activities, being used in different contexts, such as heating, cooking food, and locomotion. However, as technology advanced, new techniques emerged, such as transesterification, esterification, pyrolysis, and fermentation, considerably expanding the possibilities of using biomass as a viable and efficient energy source. With the advancement of environmental awareness and the increasing recognition of the negative impacts of fossil fuels, biomass has gained even more prominence as a “green energy,” bringing with it energy security and new economic opportunities for producers and researchers. However, this protagonism challenges the harmony between biomass production and the demand for food, thus arising the need to explore sustainable and balanced approaches for its use. According to this framework, it is necessary to highlight some factors to optimize the full potential of biomass as an energy source, such as the development and improvement of technologies aimed at improving both the quality and efficiency of its production and conversion. Aspects such as chemical composition, harvesting processes, pretreatments, and processing conditions play a crucial role in this context. Additionally, an emerging perspective that stands out is the use of secondary agricultural residues, such as fruit pits and seed husks, which could contribute to expanding biomass value chains. Taking these aspects into account, the search for innovative biofuels, such as 2,5-dimethylfuran and biokerosene, offers promising perspectives to overcome current challenges related to energy efficiency and emissions. However, these advances are not without challenges, including issues of competition for resources, technological development, and alignment with sustainability goals. It appears, therefore, that in a world that seeks environmentally responsible energy solutions, biomass plays a central role in building a resilient energy future, in tune with the needs of present and future generations.