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Preferential Carbon Monoxide Oxidation over Copper-Based Catalysts under In Situ Ball Milling

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Eckert,  Rene
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Felderhoff,  Michael
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Schüth,  Ferdi
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Eckert, R., Felderhoff, M., & Schüth, F. (2017). Preferential Carbon Monoxide Oxidation over Copper-Based Catalysts under In Situ Ball Milling. Angewandte Chemie International Edition, 56(9), 2445-2448. doi:10.1002/anie.201610501.


Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-50DC-C
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/Cr2O3 is 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.