Reactors, Kinetics and Catalysis
Spatiotemporal temperature patterns during hydrogen oxidation on a nickel disk
Samuel L. Lane,
Michael D. Graham,
Dan Luss,
Samuel L. Lane
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Search for more papers by this authorMichael D. Graham
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Search for more papers by this authorCorresponding Author
Dan Luss
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204Search for more papers by this authorSamuel L. Lane,
Michael D. Graham,
Dan Luss,
Samuel L. Lane
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Search for more papers by this authorMichael D. Graham
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Search for more papers by this authorCorresponding Author
Dan Luss
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204
Dept. of Chemical Engineering, University of Houston, Houston, TX 77204Search for more papers by this authorAbstract
Spatiotemporal temperature patterns on a polycrystalline nickel disk were recorded using infrared video imaging during atmospheric hydrogen oxidation and characterized by the proper orthogonal decomposition pattern analysis technique. The system was studied at two different residence times, 3.2 s and 6.4 s. At moderate feed temperatures, steady-state multiplicity and rate oscillations were found. Oscillations at a residence time of 6.4 s were periodic and essentially spatially uniform. At a residence time of 3.2 s, however, the surface temperature became nonuniform, and rate oscillations occurred via traveling temperature waves which emanated from “pacemakers” (locally active regions) on the edge of the catalyst. During periodic oscillations, the waves were emitted synchronously from the pacemakers, while during chaotic oscillations, the pacemakers were desynchronized and emitted waves independently of each other. Nonlocal gas-phase coupling between distance surface elements caused spatial desynchronization during rate oscillations.
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