Metal leaching from refinery waste hydroprocessing catalyst

The effectiveness of agents, such as NH 4 OH, NH 4 2 CO 3, and NH 4 2 S 2 O 8, for the extraction of Mo, V, Ni, and Al from the refinery spent catalyst has been reported as a function of reagent concentration 0.5 to 2.0 molar, time 1 to 6 h, and temperature 35 to 60°C. The optimal conditions were achieved ...

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