The carbonylation of methanol with CO using CH3O- exchange resin as a heterogeneous catalyst at temperatures near 350 K is examined systematically in an attempt to derive kinetic rate expressions for the reaction. The activation energies for the carbonylation and decarbonylation reactions are found to be 68 kJ/mol and 105 kJ/mol, respectively. The CH3O- exchange resin is also shown to suffer no degradation of catalytic activity upon repeated separation and re-use at 353 K.