Schematic representation of the different executed events at a temperature of 523 K and P(H2) = 0.528 bar and P(CO2) = 0.132 bar for simulations with ER reactions. Purple and red letters stand for species adsorbed on the NiO and NiCe sites, respectively. Black numbers represent the net number of executed processes as the average of 5 different kMC simulations in units of events site1s1. Blue arrows stand for events executed from right to left and from bottom to up, while brown arrows stand for events executed in the opposite directions. The size of the arrows represents the weight of the elementary step. Green and light green colors highlight the most important and secondary pathways, respectively.