Environmental Engineering Reference
In-Depth Information
Figure 6.19: Effect of regeneration temperature on pore size distribution of catalyst [From ref.
401
. Reprinted with permission].
surface area recovery for the NiMo/Al
2
O
3
catalyst in 2% O
2
was quite surprising because this
catalyst was deactivated by metals in addition to coke. A visual observation of the particles
after regeneration in air indicated the presence of glassy phases, thus confirming a significant
sintering.
Table 6.5: Surface area (m
2
/g) loss and recovery on fresh catalyst surface area [From ref.
331
.
Reprinted with permission].
CoMo/Al
2
O
3
NiMo/Al
2
O
3
Fresh
210
140
Spent
167
17
Treated in N
2
182
50
Surface area loss (%)
11
64
Regenerated
In air
90
54
In 2% O
2
197
127
Surface area recovery (%)
In air
43
39
In 2% O
2
94
91
