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TEM images of 2Pt/ZrO2 catalysts prepared by different calcination and reduction procedures. (A) 2Pt/ZrO2-550; (B) 2Pt/ZrO2-550-R100, average particle size of Pt: 1.4 nm; (C) 2Pt/ZrO2-550-R250, average particle size of Pt: 1.4 nm; (D) 2Pt/ZrO2-550-R400, average particle size of Pt: 1.8 nm; (E) 2Pt/ZrO2-DR250, average particle size of Pt: 3.7 nm. Note: the resolution of these TEM images does not allow identification of nanoparticles <0.5 nm.
