Benjamin Bohigues, Isabel Millet, Patricia Concepción, Avelino Corma, Manuel Moliner, Pedro Serna
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引用次数: 0
Abstract
Small metal clusters can provide improved catalytic activity compared with single metal atoms and larger metal nanoparticles of the same element. The stabilization of metal ensembles of a few atoms is extremely challenging, however, because reductive sintering and oxidative fragmentation are phenomena that often occur at low temperatures in reactive atmospheres. In this regard, the CO oxidation reaction is particularly challenging because CO tends to aggregate noble metals on nonreducible supports, such as SiO2, whereas O2 triggers the formation of (less active) single atoms on reducible supports, such as CeO2. Accordingly, state-of-the-art Pt/CeO2 catalysts undergo severe deactivation under practical CO oxidation conditions in excess of O2. In this contribution, we report a highly active CO oxidation catalyst that is able to overcome both sintering and fragmentation instabilities under conditions that make other alternatives fail. The catalyst is based on small Pt clusters inside K-MFI that benefit from both strong metal/support interactions at defective sites of the zeolite and strong electronic promotion by the support, to attain highly stable, highly active, electron-rich Pt clusters.
期刊介绍:
ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels.
The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.