Biomass is a green energy source and is available in abundance. Biochar is a carbon-rich material derived from a wide range of biomass or organic waste through the thermochemical route. Biochar has received increasing attention because of its distinctive properties such as high carbon content, greater specific surface area, cation exchange capacity, nutrient retention capacity, and stable structure. This review paper extensively studies and reports the different pyrolysis processes, reactor types, the effect of process parameters on biochar yield, and its physicochemical properties, biochar activation methods, and applications. It also details the status of the research and development (R&D) progress in biochar production through conventional and advanced technologies. The study found that unlike many products (at R&D stage) biochar has high potential to scale up and has a direct impact on crop yield, water purification (for domestic and industrial application), alternative fuels (clean solid fuel for cookstove), air purification, catalyst, biogas production, purification, and storage. In addition, the paper lists the merits and challenges in the novel biochar applications like hydrogen storage, electrochemical capacitor, and fuel cell technology.

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Recent surge in interest in biomass conversion in fluidized bed calls for an analysis of the information available on mathematical modeling of this attractive process. Such an analysis could provide a useful base for the development of mathematical tools for design or optimization of fluidized bed gasifiers. This paper analyzes the current reaction kinetics and its application in modeling pyrolysis and gasification of biomass in fluidized beds. This review identifies the knowledge gaps and relevance of different modeling approaches to design and operation of gasifier plants.

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