**6. Concluding remarks**

The Ca-Cu looping process is an emerging CO2 capture process that points out an improved efficiency and reduced cost for H2 production compared to wellestablished technologies. The functional materials needed for running the process are not a barrier for the progress of the technology, being already available with the proper Cu and Ca contents. Further research in long-term stability of these materials would be needed in order to elucidate any problem related with activity loss or agglomeration problems. The key reaction stages of the process have been already tested at a sufficient scale under conditions relevant for the operation at a large scale, but investigation in multiple reactor system at a larger scale is needed for corroborating the promising results found at lab-scale.
