| Autor: |
Onn TM; Department of Chemical and Biomolecular Engineering , University of Pennsylvania , 34th Street , Philadelphia , Pennsylvania 19104 , United States., Monai M; Department of Chemical and Pharmaceutical Sciences, ICCOM-CNR, Consortium INSTM , University of Trieste , via L. Giorgieri 1 , 34127 Trieste , Italy., Dai S; Department of Chemical Engineering and Materials Science , University of California , Irvine , California 92697 , United States., Fonda E; SAMBA Beamline, Synchrotron SOLEIL, L'Orme des Merisiers , Saint Aubin BP48 , 91192 Gif sur Yvette Cedex , France., Montini T; Department of Chemical and Pharmaceutical Sciences, ICCOM-CNR, Consortium INSTM , University of Trieste , via L. Giorgieri 1 , 34127 Trieste , Italy., Pan X; Department of Chemical Engineering and Materials Science , University of California , Irvine , California 92697 , United States.; Department of Physics and Astronomy , University of California , Irvine , California 92697 , United States., Graham GW; Department of Chemical Engineering and Materials Science , University of California , Irvine , California 92697 , United States., Fornasiero P; Department of Chemical and Pharmaceutical Sciences, ICCOM-CNR, Consortium INSTM , University of Trieste , via L. Giorgieri 1 , 34127 Trieste , Italy., Gorte RJ; Department of Chemical and Biomolecular Engineering , University of Pennsylvania , 34th Street , Philadelphia , Pennsylvania 19104 , United States. |
| Abstrakt: |
The concept of self-regenerating or "smart" catalysts, developed to mitigate the problem of supported metal particle coarsening in high-temperature applications, involves redispersing large metal particles by incorporating them into a perovskite-structured support under oxidizing conditions and then exsolving them as small metal particles under reducing conditions. Unfortunately, the redispersion process does not appear to work in practice because the surface areas of the perovskite supports are too low and the diffusion lengths for the metal ions within the bulk perovskite too short. Here, we demonstrate reversible activation upon redox cycling for CH 4 oxidation and CO oxidation on Pd supported on high-surface-area LaFeO 3 , prepared as a thin conformal coating on a porous MgAl 2 O 4 support using atomic layer deposition. The LaFeO 3 film, less than 1.5 nm thick, was shown to be initially stable to at least 900 °C. The activated catalysts exhibit stable catalytic performance for methane oxidation after high-temperature treatment. |
