The increasing demand for energy and concerns about environmental issues have led to a focus on clean fuels like hydrogen. Hydrogen, known for its minimal pollution and high efficiency, is seen as a viable alternative to traditional fossil fuels. Researchers are also looking into the conversion of CO2 into formic acid, which can store hydrogen effectively. Technologies like chemical looping combustion show promise in capturing CO2 efficiently while producing fuels such as syngas and hydrogen. The development of three-reactor structures in chemical looping combustion processes is gaining interest for simultaneous hydrogen generation and CO2 capture. Various research studies have shown the potential of these technologies in reducing emissions and improving energy efficiency. The integration of different processes in multigeneration systems aims to maximize energy outputs and enhance overall system efficiency. With ongoing research and advancements in these clean energy technologies, the future looks promising for sustainable energy production and reduced environmental impact.