Unraveling the oscillation reaction of Ni catalyst during partial oxidation of methane
- Unraveling the oscillation reaction of Ni catalyst during partial oxidation of methane
- 이대희; D. Kim; 김주선; 문주호
- Issue Date
- , 64-64
- Oscillatory behavior during partial oxidation ofmethanewould give us a
clue to understand the detailed mechanisms of heterogeneous catalysis.
It is reported that oscillations of reaction rate, temperature and potential
of catalyst are observed during partial oxidation of methane under the
given temperature and pressure conditions. Although the cyclic adsorption
and diffusion of oxygen into the subsurface of nickel is generally
recognized as themain reason for oscillation behavior, the exact kinetics
and equilibrium condition of heterogeneous surface reactions, that determine
the amplitude and period of oscillation, need to be clarified to
elucidate the mechanisms of heterogeneous catalysis. In this study, we
introduce electrochemical characterizations for in situ analysis of nickel
surfaces that undergo the repeated redox cycle. Information about polarization
characteristics as well as the concentration of mobile charge
species enables us to determine real time variation of nickel surface during
the redox cycle so that the oxidation of surface differs depending on
the locationwhether it is the active site for the catalytic reactionornot.
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