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X-ray diffraction patterns for Pd-Au/SiO2 catalysts: (1) 5% Pd/SiO2; (2) 5% Pd-0.2% Au/SiO2; (3) 5% Pd-0.5% Au/SiO2; (4) 5% Pd-1% Au/SiO2; (5) 5% Pd-2% Au/SiO2; (6) 5% Pd-5% Au/SiO2; (7) 5% Au/SiO2 and the linear relationship of interplanar distances in the composition function of these systems (Vegard’s rule). The bimetallic catalysts were activated in a hydrogen atmosphere for 2 h at 300 °C. Adapted from ref. [29].
