Tuning the Structure of Platinum Particles on Ceria In Situ for Enhancing the Catalytic Performance of Exhaust Gas Catalysts

• DOI: 10.1002/anie.201707842
• Publication Date: 2017-08-10T13:49:08Z
• Authors: Andreas M. Gänzler; Maria Casapu; Philippe Vernoux; Stéphane Loridant; Francisco J. Cade...; Thierry Epicier; Benjamin Betz; Rüdiger Hoyer; Jan‐Dierk Grunwaldt
• Keywords: info:eu-repo/classification/ddc/540; ddc:540; Chemistry & allied sciences; 540; 01 natural sciences; 7. Clean energy; 0104 chemical sciences

Abstract A dynamic structural behavior of Pt nanoparticles on the ceria surface under reducing/oxidizing conditions was found at moderate temperatures (<500 °C) and exploited to enhance catalytic activity Pt/CeO 2 ‐based exhaust gas catalysts. Redispersion platinum in an oxidizing atmosphere already occurred 400 °C. protocol with reducing pulses 250–400 °C applied a subsequent step for controlled Pt‐particle formation. Operando X‐ray absorption spectroscopy unraveled different extent reduction sintering particles: The choice reductant allowed tuning degree/particle size thus (CO>H >C 3 H 6 ). This nature such low (250–500 additionally confirmed by situ environmental transmission electron microscopy. general concept is proposed adjust noble metal dispersion (size, structure), example, during operation catalyst.