Dr. Pedro Castaño, Associate Professor, Chemical Engineering, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST), (Saudi Arabia), delivered the talk “Retained species on zeolite catalysts as key factor controlling sustainable processes viability, output and lifetime”. The event took place virtually on July 12th, 2021 and it was organized in the frame of the Doctorate in Chemical Engineering, Energy and Processes of the University of Cantabria.