Origin of the Normal and Inverse Hysteresis Behavior during CO Oxidation over Pt/Al2O3

ACS Catalysis, Prof. Dr. Jan-Dierk Grunwaldt, KIT Karlsruhe.  Origin of the Normal and Inverse Hysteresis Behavior during CO Oxidation over Pt/Al2O3 By the application of conventional and advanced preparation methods, such as flame spray pyrolysis and supercritical fluid reactive deposition, a series of catalysts containing homogeneous distributions of Pt particles were obtained. An optimal Pt particle size of 2−3 nm was identified for the CO oxidation light-off on Pt/Al2O3 catalysts. The CO oxidation results show a clear correlation between the Pt nanoparticle size and the ignition/extinction profile, including the switch of the hysteresis loop. For details: Origin of the Normal and Inverse Hysteresis Behavior during CO Oxidation over Pt/Al2O3 Maria Casapu,*,† Anna Fischer,† Andreas M. Gänzler,† Radian Popescu,‡ Marlene Crone,§ Dagmar Gerthsen,‡ Michael Türk,§ and Jan-Dierk Grunwaldt*,† ^{†Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany ‡Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany §Institute for Technical Thermodynamics and Refrigeration, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany} ACS Catalysis – November 2016 DOI: 10.1021/acscatal.6b02709