Environmental Engineering Reference
In-Depth Information
Table 11.2: Metal recovery from spent catalysts by acid leaching.
Metals in spent catalysts
Reagents
Recovery of metals (wt.%)
Reference
Mo
V
Ni
Co
Al
Mo, V, Ni, Co, Al
H
2
SO
4
99
.
7
92
.
5
-
-
-
[622,623]
Mo, Ni, Al
2
O
3
H
2
SO
4
93
-
98
-
96
[626]
Co, Mo
Aqueous SO
2
solution
100
-
-
100
-
[630]
Co, Mo
H
2
SO
4
+HNO
3
(3:1)
96
-
-
96
-
[630]
Co, Mo
H
2
SO
4
+Al
2
(SO
4
)
3
or
(NH
4
)
2
SO
4
92
-
-
97
-
[627]
Mo, Co, Ni
H
2
SO
4
+H
2
S
-
-
-
-
-
[620]
Mo, V, Co, Ni
H
2
SO
4
>
90
-
-
>
90
-
[311]
Mo, V, Ni, Al
Oxalic acid +H
2
O
2
90
94
65
-
33
[632]
Mo, V, Ni
Tartaric acid
93
94
83
-
-
[631]
Mo, V, Ni
Citric acid
94
94
85
-
-
[631]
Mo, V, Co, Ni, Al
H
2
SO
4
-
-
-
-
-
[621]
