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Kinetic Study of Nickel Leaching from Spent Catalyst in Sulfuric Acid solution

[ Ahmad Jamshidi Bonab ] - M.Sc Student, Applied Chemistry
[ S. Aahmad Hosseini ] - Ph.D. Chemical Engineering
[ M.Ali. Khalilzadeh ] - Ph.D. Organic Chemistry

خلاصه مقاله:

The kinetics of spent nickel oxide catalyst (NiO/Al2O3) leaching in sulfuric acid solution
was investigated. The effects of spent catalyst particle size, acid concentration and
reaction temperature on Ni extraction rate were determined. The results obtained show
that extraction of about 96% is achieved using 200 mesh spent catalyst particle size at a
reaction temperature of 100C for 360 min reaction time with 60% sulfuric acid
concentration. The solid/liquid ratio was maintained constant at 1:20 g/ml. Leaching
kinetics are controlled either by diffusional mass transfer of either reactant or product ions
through a liquid boundary layer or a product metal deposit. The leaching kinetics
indicates that chemical reaction at the surface of the particles is the rate-controlling
process during the reaction. The activation energy was determined as about 33.65 kJ/mol.
This is consistent with values of activation energies reported for surface controlled
reactions.

Spent catalyst – Leaching - Sulfuric acid - kinetic study