The persistent increase of the average temperature of the Earth indicates that global warming is the main problem to be solved in the next years, since it affects both planet and human health. The principal cause of global warming is the continuous use of fossil fuel plants to satisfy the ever-increasing energy demand. One possible alternative to counteract global warming is to investigate CCUS (Carbon Capture Utilization and Storage) technologies for capturing CO2 already generated by current fossil fuel energy systems and develop methods to convert CO2 into useful chemicals or combustible gases. Among the possible methods, one of the most promising is the renewable chemical looping process (R-CLR) for two-step thermochemical CO2 splitting: heat at high temperature provided by a renewable energy system (typically a Concentrated Solar Power CSP system) is imposed on the looping material that alternates between a reduced and an oxidized state producing syngas (CO + H2) as a useful product starting from CO2 and H2O.