1. Recovery of Co, Mo and Ni contained in the spent catalysts;Gaballah;EC, Report No. 4, Contract No. MA1R-0014-C(A),1990
2. Recovery of Metal values from spent coMo/A1203 petroleum hydrodesulfurization and coal liquefaction catalysts: laboratory-scale process and preliminary economics;Sebenik,1982
3. Recylers try new ways to process spent catalysts;Parkinson;Chem. Eng.,1987
4. Recovery of Vanadium and Molybdenum from heavy oil desulphurization waste catalyst;Biswas;Hydrometallurgy,1985
5. Treatment of alumina-base catalysts;Marcantonio;U.S. Patent No. 4,537,751, 27/3/1985,1985