Catalytic decomposition of methanol (MD) plays a significant role in the production of hydrogen, which is deemed to be one of the most, if not the most, desirable clean fuels. Thus, the catalytic mechanisms, or pathways, of MD have lately been the focus of intense research interest. Recently, the feasible independent pathways (IP_i's) have been reported on the basis of a set of highly plausible elementary reactions. Nevertheless, no feasible acyclic combined pathways (AP_i's) comprising IP_i's have been concomitantly reported. Such AP_i's can not be ignored in identifying dominant pathways, as demonstrated in the current work.