Traveling Interface Modulations And Anisotropic Front Propagation In Ammonia Oxidation Over Rh(110)

The bistable NH3 + O-2 reaction over a Rh(110) surface was explored in the pressure range 10(-6)-10(-3) mbar and in the temperature range 300-900 K using photoemission electron microscopy and low energy electron microscopy as spatially resolving methods. We observed a history dependent anisotropy in front propagation, traveling interface modulations, transitions with secondary reaction fronts, and stationary island structures. (C) 2015 AIP Publishing LLC.