Germanium in amounts corresponding nominally to 2 or 1/8 monolayers was added to a 1% Pt/Al2O3 catalyst by controlled surface reaction. These catalysts, noted as Ge2 and Ge1/8, were tested in transformation of hexane, benzene, and cyclohexene in hydrogen excess and compared with the Ge-free parent sample. All catalysts produced isomers, methylcyclopentane, fragments, benzene, and hexenes from hexane at T = 603 K. Ge2 gave the highest TOF values, likely by preventing carbon accumulation. The selectivity of a saturated C-6 product was highest on Ge1/8, which also gave cyclohexane in amounts that increased as more H-2 was present. Particular Pt(111) arrangements required for the formation of benzene may have been selectively blocked by Ge on the Ge1/8 sample. This was supported by comparing benzene and cyclohexene transformation, The Ge1/8 sample was almost inactive in benzene hydrogenation, and active in cyclohexene transformation, whereas the parent and the Ge2 sample were active in both reactions. The catalyst Ge1/8 may serve as a basis for development of novel reforming catalysts producing isomers and less aromatic compounds.