Geometry-induced pulse instability in microdesigned catalysts: the   effect of boundary curvature
  We explore the effect of boundary curvature on the instability of reactive pulses in the catalytic oxidation of CO on microdesigned Pt catalysts. Using ring-shaped domains of various radii, we find that the pulses disappear (decollate from the inert boundary) at a turning point bifurcation, and trace this boundary in both physical and geometrical parameter space. These computations corroborate experimental observations of pulse decollation. 
L. Qiao, I. G. Kevrekidis, C. Punckt, H. H. Rotermund