The catalytic behavior of 1/1 cation (Ga, Cu, or In)/framework-Al MFI (MFI is terminology officially sanctioned by the International Zeolite Association, IUPAC commission) zeolite for propane dehydrocyclization was examined under conditions where the materials were initially either in fully protonated or fully metal-loaded states. Metal-loading was accomplished with reductive solid-state ion exchange, and under appropriate conditions, loadings nearing 100% exchange of protons for the reduced univalent cations could be achieved. Ga-MFI is stable to dehydrocyclization reaction conditions to at least similar to 800 K, but both In-MFI and Cu-MFI convert to a relatively inactive catalytic state under similar conditions probably by reduction. However, prior to this reduction, In-M:FI and Cu-MFI are equivalent or superior to Ga-MFI for the formation of aromatics. The initial zero-protonated state for Ga-MFI was characterized by little or no C-C bond scission to methane, a high benzene/toluene ratio, and a strongly olefinic and branched C-4 fraction. On this basis, a reaction mechanism for this state not involving protons, and not bifunctional, is proposed.