title: Preferential Carbon Monoxide Oxidation over Copper-Based Catalysts under In Situ Ball Milling.
abstract: In situ ball milling of solid catalysts is a promising yet almost unexplored concept for boosting catalytic performance. The continuous preferential oxidation of CO (CO-PROX) under in situ ball milling of Cu-based catalysts such as Cu/Cr2O3is presented. At temperatures as low as -40 °C, considerable activity and more than 95 % selectivity were achieved. A negative apparent activation energy was observed, which is attributed to the mechanically induced generation and subsequent thermal healing of short-lived surface defects. In situ ball milling at sub-zero temperatures resulted in an increase of the CO oxidation rate by roughly 4 orders of magnitude. This drastic and highly selective enhancement of CO oxidation showcases the potential of in situ ball milling in heterogeneous catalysis.
authors.affiliation: Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
authors.forename: Rene
authors.identifier: 0000-0001-8644-163X
authors.initials: R
authors.lastname: Eckert
authors.affiliation: Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Felderhoff
authors.affiliation: Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
authors.forename: Ferdi
authors.initials: F
authors.lastname: Schüth
keywords: ball milling; copper; heterogeneous catalysis; oxidation; solvent-free reactions