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The materials are characterized by N<jats:sub>2<\/jats:sub> adsorption at 77\u2005K, temperature\u2010programmed desorption coupled with mass spectrometry, H<jats:sub>2<\/jats:sub> chemisorption, transmission electron microscopy and thermogravimetric analysis; they are tested in the selective hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions (363\u2005K and 1\u2005MPa). A thermal activation at 973\u2005K is found to have a very positive effect over both activity and selectivity, leading to selectivities of approximately 70\u2009%, at 50\u2009% conversion, regardless of the active metal phase (Pt or Ir). Since no noticeable differences in the metal particle sizes are detected, the results are interpreted in light of an enhanced metal\/support interaction. 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