TOF of C3H6 oxidation on Pd/Al2O3 strongly depends on Pd dispersion. Pd0/PdOx ratio is an important factor to determine C3H6 oxidation activity. Acrylate species participates as an intermediate in C3H6 oxidation on Pd/Al2O3. Pd/Al2O3 shows steady TOF of CO oxidation in the entire Pd dispersion range.