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Methylene Blue (MB) and Methylene Green (MG) adsorbed on a synthetic zeolite (13X) and incorporated in carbon paste resulted in modified electrodes (MB-13X-CPEs and MG-13X-CPEs) with electrocatalytic activity for H₂O₂ reduction. Using the treatment proposed by Laviron, the heterogeneous electron transfer rate constant (k_s) was estimated, and values between 2.9 and 6.6 s^-1 were found. The electrocatalytic ability of the modified electrodes towards H₂O₂ electroreduction depends mainly on the formal potential of mediator. The MB-13X-CPEs and MG-13X-CPEs respond to H₂O₂ in the linear range from ~10^-4 to 10^-1 M. The best performances were attained with MB-13X-CPEs in phosphate buffer (pH 6): detection limit 0.13 mM, at a signal to noise ratio equal to 3; sensitivity 0.94 mA/M, calculated as the ratio I_max/K_M.