Mechanistic insights into the oxidation of catalytically relevant AgCu near‐surface alloy interfaces

Laura A. Cramer; Prashant Deshlahra; E. Charles H. Sykes

doi:10.1002/agt2.133

journal article Open Access Oct 22, 2021

Mechanistic insights into the oxidation of catalytically relevant AgCu near‐surface alloy interfaces

Laura A. Cramer Prashant Deshlahra

E. Charles H. Sykes

Aggregate Vol. 3 No. 4 · Wiley

View at Publisher Save 10.1002/agt2.133

Abstract

AbstractRecent heterogeneous catalysis studies have demonstrated that synergy between Ag and Cu can lead to more selective partial oxidation chemistries. We performed a series of scanning tunneling microscope experiments to gain a better understanding of the AgCu system under oxidative conditions. These experiments were carried out by exposing sub‐monolayer coverages of Ag on Cu(111), in the form of a near‐surface alloy (NSA), to range of oxygen exposures and temperatures. This enabled us to study the initial stages of oxidation of well‐defined Ag/Cu interfaces with atomic resolution and thereby understand the dynamic response of the AgCu NSA to oxygen environments. At low oxygen exposures, oxidation was observed on exposed Cu terraces and at the interface between the AgCu NSA and Cu(111). Higher oxygen exposure led to the segregation of Cu atoms up through the Ag layer and the appearance of surface adsorbed oxygen. Significant phase segregation of Cu was then observed at higher oxygen exposures at elevated temperatures, evidenced by the formation of Cu oxide patches within and on the top of the Ag layer. These results provide a more detailed picture of how AgCu NSAs interact with, and restructure in response to, oxygen.

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References

47

[1]

10.1021/acscatal.7b04187

[2]

10.1016/j.jcat.2005.10.018

[3]

10.1016/j.jcat.2004.03.007

[4]

10.1021/cs4009368

[5]

10.1039/c7cp02892j

[6]

10.1007/s11164-011-0424-6

[7]

10.1126/science.1185200

[8]

Comparison of Cu and Ag Catalysts for Epoxidation of Higher Olefins

John R. Monnier, Gary W. Hartley

Journal of Catalysis 10.1006/jcat.2001.3336

[9]

10.1016/j.jcat.2012.05.006

[10]

10.1016/j.jcat.2005.10.019

[11]

10.1021/ja994125j

[12]

10.1006/jcat.2001.3381

[13]

10.1006/jcat.2001.3358

[14]

10.1016/j.jcat.2004.06.005

[15]

10.1021/cs200055d

[16]

10.1002/anie.201301419

[17]

10.1016/0021-9517(84)90099-x

[18]

10.1021/acs.iecr.7b01323

[19]

10.1016/s0926-3373(00)00147-8

[20]

10.1126/science.1231631

[21]

10.1039/c7sc04728b

[22]

10.1021/acscatal.8b00660

[23]

10.1016/j.susc.2006.12.028

[24]

10.1016/0039-6028(96)00738-8

[25]

10.1103/physrevlett.109.235502

[26]

Jensen F. Surf. Sci. Lett. (1991)

[27]

10.1016/s0039-6028(02)02164-7

[28]

10.1016/s0039-6028(00)00918-3

[29]

10.1021/jp303488t

[30]

10.1016/0039-6028(86)90191-3

[31]

10.1021/acscatal.6b01239

[32]

10.1016/0039-6028(95)00594-3

[33]

10.1016/0039-6028(85)90634-x

[34]

10.1039/c5cp00342c

[35]

10.1016/0039-6028(95)00670-2

[36]

10.1016/j.susc.2006.08.049

[37]

10.1021/acs.jpcc.9b09131

[38]

10.1016/0079-6816(93)90006-h

[39]

10.1039/c2cp22472k

[40]

10.1021/jp903541k

[41]

10.1016/0039-6028(92)90545-h

[42]

10.1016/s0039-6028(01)01670-3

[43]

10.1021/acs.jpclett.0c00887

[44]

10.1016/0039-6028(92)91282-g

[45]

10.1021/acsami.0c03963

[46]

10.1016/j.susc.2008.10.050

[47]

10.1016/j.susc.2005.03.035

Metrics

4

Citations

47

References

Details

Published: Oct 22, 2021
Vol/Issue: 3(4)
License: View

Authors

L

Laura A. Cramer

Department of Chemistry Tufts University Medford Massachusetts USA

P

Prashant Deshlahra

Department of Chemical and Biological Engineering Tufts University Medford Massachusetts USA

E

E. Charles H. Sykes

Department of Chemistry Tufts University Medford Massachusetts USA

Funding

National Science Foundation Award: CHE‐2034911

Cite This Article

Laura A. Cramer, Prashant Deshlahra, E. Charles H. Sykes (2021). Mechanistic insights into the oxidation of catalytically relevant AgCu near‐surface alloy interfaces. Aggregate, 3(4). https://doi.org/10.1002/agt2.133

Mechanistic insights into the oxidation of catalytically relevant AgCu near‐surface alloy interfaces

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