Summary
Identifying active platinum species at the surface of Pt/CeO 2 catalysts is still a hot topic in the literature. In this work, an oxidizing pretreatment at 500 °C was applied to generate ultradispersed PtO x species before the reaction. It is shown that the molar activity of such catalysts for the water-gas shift reaction is strongly dependent on the platinum content, increasing by a factor of 2.5 from 0.1 to 0.6 wt% and stabilizing from 0.6 to 1.4 wt%. The tracking of Pt species present under reaction conditions (230 °C, H 2 O/CO=4) was performed using operando DRIFT spectroscopy, CO-TPR and STEM in connection with the catalytic activity. A major structural change was found for Pt loadings above 0.6 wt% through the formation of metallic Pt 0 nanoparticles of ca 1.4 nm from oxidized Pt sin
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