Maximizing utilization of reactivated and left-over catalysts in heavy gas oil hydrotreater: A case study of ADNOC RefiningPaco Laveille, Abdul-Hamid Chaudhry, Alessandro Riva, Alain Salameh, Gnanapragasam Singaravel, Pierre Dufresne, Stephane Morin and Mikael BerthodOil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 73 (2018) 59DOI: https://doi.org/10.2516/ogst/2018053