Environmental Engineering Reference
In-Depth Information
Initial catalyst configuration
Fe
Fe
O
O
O
Fe
Fe
Fe
O
O
H
2
O
H
2
H
2
H
2
Fe
Fe
Fe
Fe
Lattice
oxygen
utilization,
H
2
O
formation
Molecular
adsorption
of H
2
O
O
O
O
O
O
Fe
Fe
Fe
Fe
Fe
Fe
O
O
O
O
H
2
H
2
O
O
2
O
O
Fe
Fe
Fe
Fe
Dissociative
adsorption
of O
2'
reoxidation
of support
Interaction
of H
2
from
gas phase,
H
2
O
formation
O
O
O
O
O
O
Fe
Fe
Fe
Fe
Fe
Fe
O
O
O
O
FIGURE 8.7
Proposed mechanism of catalytic hydrogen combustion over Fe-based compound.
Source
:
Reproduced with permission from Deshpande et al. [14].
oxygen species on the support, interaction of H
2
from gas phase with oxygen
adsorbed in the support, and release of H
2
O giving back the catalyst in its
original form.
8.5 SUMMARY
Hydrogen combustion is a fast, efficient, and complex process involving
many elementary reactions. The reaction mechanisms are highly dependent
on many factors, including pressure, temperature, reactor structure, and
carrier or dilute gases. The reaction is extremely useful and can be danger-
ous. Thus, major precaution is required in dealing with the reaction. While
substantial research has been done on this reaction, the detailed reaction
mechanism still could use further research, partly due to its complex and fast
nature. With advancement in computational chemistry, new insight into the
reaction mechanism could be gained from the theoretical and computational
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