The homologation of methane on supported transition metal catalysts was investigated by using the transient response characterization (TRC). The different factors which greatly affected the reaction were also extensively studied. An important approach is to split the overall reaction into two reaction steps occurring under moderate conditions. In such a two-step route the thermodynamic limitations can be overcome and the homologation of methane may be practically achieved. The optimum conversion of methane on 5wt% Pt/SiO2 catalyst in the homologation of methane is 9.91% reached at 523K. Of interest is that this reaction might be performed at the same temperature. Platinum and cobalt catalysts favor the homologation of methane. The product distribution and the features of this reaction depend sensitively on the nature of transition metals and the different parameters. This approach might provide an alternative route for the extensive utilization of natural gas. Carbidic and carbonaceous species formed by the decomposition of methane on metal surface may be active intermediates which are responsible for the lengthening of carbon-carbon chain on catalyst surface.

Key words: METAL CATALYST, METHANE, POLYMERIZATION, CATALYTIC BEHAVIOUR