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26 results on '"Lucci, Felicia R."'

5. Templated Growth of a Homochiral Thin Film Oxide

Author

Schilling, Alex C., primary, Therrien, Andrew J., additional, Hannagan, Ryan T., additional, Marcinkowski, Matthew D., additional, Kress, Paul L., additional, Patel, Dipna A., additional, Balema, Tedros A., additional, Larson, Amanda M., additional, Lucci, Felicia R., additional, Coughlin, Benjamin P., additional, Zhang, Renqin, additional, Thuening, Theodore, additional, Çınar, Volkan, additional, McEwen, Jean-Sabin, additional, Gellman, Andrew J., additional, and Sykes, E. Charles H., additional

Published
2020
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13. Tackling CO Poisoning with Single-Atom Alloy Catalysts

Author

Liu, Jilei, primary, Lucci, Felicia R., additional, Yang, Ming, additional, Lee, Sungsik, additional, Marcinkowski, Matthew D., additional, Therrien, Andrew J., additional, Williams, Christopher T., additional, Sykes, E. Charles H., additional, and Flytzani-Stephanopoulos, Maria, additional

Published
2016
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23. Tackling CO Poisoning with Single-Atom Alloy Catalysts.

Author

Jilei Liu, Lucci, Felicia R., Ming Yang, Sungsik Lee, Marcinkowski, Matthew D., Therrien, Andrew J., Williams, Christopher T., Sykes, E. Charles H., and Flytzani-Stephanopoulos, Maria

Subjects
*PLATINUM compounds, *NANOPARTICLES, *ACETYLENE, *FUEL cells, *METHANOL
Abstract

Platinum catalysts are extensively used in the chemical industry and as electrocatalysts in fuel cells. Pt is notorious for its sensitivity to poisoning by strong CO adsorption. Here we demonstrate that the single-atom alloy (SAA) strategy applied to Pt reduces the binding strength of CO while maintaining catalytic performance. By using surface sensitive studies, we determined the binding strength of CO to different Pt ensembles, and this in turn guided the preparation of PtCu alloy nanoparticles (NPs). The atomic ratio Pt:Cu = 1:125 yielded a SAA which exhibited excellent CO tolerance in H² activation, the key elementary step for hydrogenation and hydrogen electro-oxidation. As a probe reaction, the selective hydrogenation of acetylene to ethene was performed under flow conditions on the SAA NPs supported on alumina without activity loss in the presence of CO. The ability to maintain reactivity in the presence of CO is vital to other industrial reaction systems, such as hydrocarbon oxidation, electrochemical methanol oxidation, and hydrogen fuel cells. [ABSTRACT FROM AUTHOR]

Published
2016
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25. H2Activation and Spillover on Catalytically Relevant Pt–Cu Single Atom Alloys

Author

Lucci, Felicia R., Marcinkowski, Matthew D., Lawton, Timothy J., and Sykes, E. Charles H.

Abstract

Platinum is a key component in many heterogeneous hydrogenation catalysts. Because of its high price, fairly strong interaction with intermediates, and susceptibility to CO poisoning, it is often mixed with other elements. These bimetallic alloys have complex surface structures, and the atomic structure of their active sites is not well understood. In this study, we examine the effect of the geometric arrangement of dilute Pt–Cu alloys on H2activation, spillover, and release. Using scanning tunneling microscopy, we directly visualize the atomic arrangement of Pt–Cu alloys and show that small amounts of Pt (∼1%) exists as isolated atoms in the Cu surface. These Pt monomers are capable of facile H2dissociation and spillover to Cu at temperatures as low as 85 K. Additionally, the low-temperature desorption of H2(230 K) suggests a reduced desorption barrier compared to monometallic Pt or Cu. We find these single atom alloy surfaces are robust to multiple adsorption/desorption and heating cycles to 450 K. Larger Pt ensembles in Cu exhibit higher temperature desorption profiles due to the stronger binding of H to extended Pt ensembles, demonstrating how the geometric arrangement of Pt atoms in Cu impacts the binding of H to catalytic surface sites. Overall, dilute Pt–Cu alloys containing only isolated Pt atoms are most favorable for H2activation, spillover, and release and hence should be capable of catalyzing hydrogenation reactions with a greatly reduced concentration of the precious metal.

Published
2015
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