An original method is used to obtain stable nanoparticles of gold-based mono- and bimetallic systems supported on an acidic zeolite. This approach has been applied to Au/Y, and to bimetallic Pd-Au/Y and Pt-Au/Y systems containing between 1 and 3% of metal, Metal clusters of gold or alloy are formed inside the supercages of the zeolite framework by the thermal reduction of cations by the ligands (en = H2N-CH2-CH2-NH2) under inert gas flow at a temperature depending on the metal. The use of acidic zeolites favours the dispersion of the metal and the thermal stability of the particles. This stability is explained by chemical anchoring of metal clusters by the Bronsted sites of the support. The different mono- and bimetallic catalysts tested on the methylcyclopentane hydroconversion reaction reveal that the addition of gold to the metal (platinum or palladium) leads to an increase in the activity and an improvement in the selectivity for isomerization of the skeleton (cyclohexane and benzene) to the detriment of hydrogenolysis.