“…A direct observation of the surface species is lacking and changes in reaction conditions can initiate changes in the surface structure which, in turn, affect the local reactivity of the surface [66]. The use of direct CO dissociation as a possible CO activation step is, hence, a viable option [13,16,21,25,34,[67][68][69]. With respect to the chain growth step, it is noted that several microkinetic models have already adopted the carbide mechanism considering CH2 as the propagating species on Co [15,18,19,21,22,25].…”