Enhancement of the efficiency of in situ combustion technique for heavy-oil recovery by application of nickel ions

► Nano nickel particles were tested as catalyst in high and low temperature oxidation. ► The effect of nickel ions on combustion increases by increasing temperature. ► A significant catalytic effect on low temperature reactions was observed. ► Findings are of significant importance for improvement of in situ combustion oil recovery. ► Low temperature oxidation increases oil viscosity. Nickel reduce this effect considerably.