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XRD patterns of (a) Ru–P/SiO2 and Ru/SiO2, (b) Rh–P/SiO2 and Rh/SiO2, (c) Pd–P/SiO2 and Pd/SiO2, and (d) Pt–P/SiO2 and Pt/SiO2. TEM images and size-distribution histograms of (e and i) Ru–P/SiO2, (f and j) Rh–P/SiO2, (g and k) Pd–P/SiO2, and (h and l) Pt–P/SiO2.
