Title of article :
Spatiotemporal patterns in catalytic systems
Author/Authors :
Dan Luss، نويسنده , , Moshe Sheintuch، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2005
Pages :
21
From page :
254
To page :
274
Abstract :
Infrared thermography measurements in various oxidation reactions revealed high-temperature domains whose boundaries are either stationary, oscillating, moving or rotating. These motions were observed on catalytic wires, rings, cylindrical pellets and thin catalytic beds. Their evolutions are different from the classical Turing mechanism, which explains many of the pattern formation in reaction–diffusion system. The observed patterns are strongly affected by the interaction between the local surface reaction rate, the mixing in the surrounding reactant phase and by the intrinsic heterogeneity of the catalytic surface and the transport coefficients. While simulations can qualitatively predict such patterns, quantitative predictions require a reliable kinetic model. Formation of hot regions in a three-dimensional fixed-bed can be predicted with reliable kinetic models. While formation of hot regions in the flow direction in the reactor are reasonably well understood, there is still a need to gain qualitative understanding as well as design criteria for formation of hot zones transversal to the flow direction.
Keywords :
Catalytic systems , Hot zones , Spatiotemporal patterns , Global coupling , Impact of non-uniformities
Journal title :
CATALYSIS TODAY
Serial Year :
2005
Journal title :
CATALYSIS TODAY
Record number :
1234302
Link To Document :
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