Atomic and Molecular Adsorption on Ag(111)
Abstract
The adsorption of atomic (H, C, N, O, S) and molecular (OH, CH x, NH x, CO, NO, CN, N 2, HNO, NOH, HCN, x = 1–3) species at 1/4 monolayer coverage on an extended Ag(111) surface was studied here using periodic density functional theory. Geometries and energies were calculated self-consistently using the PW91 functional; nonself-consistent energies using the RPBE functional are also provided. We analyze the binding energies, binding geometries, estimated diffusion barriers, harmonic vibrational frequencies, and energetic and geometric deformation parameters of these adsorbates, comparing them to experimental and theoretical results whenever possible. PW91 gives binding energies that match experimental binding energies more closely than RPBE, which consistently predicts weaker binding than PW91. The data were then used to construct and analyze thermochemistry-only potential energy pathways for the hydrocarbon-assisted and hydrogen-assisted selective catalytic reduction (SCR) of nitric oxide (NO). These analyses provide preliminary insights into the possible mechanistic paths of the SCR of NO on Ag(111). Specifically, we show that deep dehydrogenation leading to the formation of atomic intermediates is not favored on Ag(111).
- Authors:
-
[1]
- Univ. of Wisconsin, Madison, WI (United States). Dept. of Chemical and Biological Engineering
- Publication Date:
- Research Org.:
- Univ. of Wisconsin, Madison, WI (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
- OSTI Identifier:
- 1494745
- Grant/Contract Number:
- FG02-05ER15731; AC02-06CH11357; AC02-05CH11231
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 123; Journal Issue: 13; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Chen, Benjamin W. J., Kirvassilis, Demetrios, Bai, Yunhai, and Mavrikakis, Manos. Atomic and Molecular Adsorption on Ag(111). United States: N. p., 2018.
Web. doi:10.1021/acs.jpcc.7b11629.
Chen, Benjamin W. J., Kirvassilis, Demetrios, Bai, Yunhai, & Mavrikakis, Manos. Atomic and Molecular Adsorption on Ag(111). United States. doi:10.1021/acs.jpcc.7b11629.
Chen, Benjamin W. J., Kirvassilis, Demetrios, Bai, Yunhai, and Mavrikakis, Manos. Thu .
"Atomic and Molecular Adsorption on Ag(111)". United States. doi:10.1021/acs.jpcc.7b11629. https://www.osti.gov/servlets/purl/1494745.
@article{osti_1494745,
title = {Atomic and Molecular Adsorption on Ag(111)},
author = {Chen, Benjamin W. J. and Kirvassilis, Demetrios and Bai, Yunhai and Mavrikakis, Manos},
abstractNote = {The adsorption of atomic (H, C, N, O, S) and molecular (OH, CHx, NHx, CO, NO, CN, N2, HNO, NOH, HCN, x = 1–3) species at 1/4 monolayer coverage on an extended Ag(111) surface was studied here using periodic density functional theory. Geometries and energies were calculated self-consistently using the PW91 functional; nonself-consistent energies using the RPBE functional are also provided. We analyze the binding energies, binding geometries, estimated diffusion barriers, harmonic vibrational frequencies, and energetic and geometric deformation parameters of these adsorbates, comparing them to experimental and theoretical results whenever possible. PW91 gives binding energies that match experimental binding energies more closely than RPBE, which consistently predicts weaker binding than PW91. The data were then used to construct and analyze thermochemistry-only potential energy pathways for the hydrocarbon-assisted and hydrogen-assisted selective catalytic reduction (SCR) of nitric oxide (NO). These analyses provide preliminary insights into the possible mechanistic paths of the SCR of NO on Ag(111). Specifically, we show that deep dehydrogenation leading to the formation of atomic intermediates is not favored on Ag(111).},
doi = {10.1021/acs.jpcc.7b11629},
journal = {Journal of Physical Chemistry. C},
issn = {1932-7447},
number = 13,
volume = 123,
place = {United States},
year = {2018},
month = {1}
}
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Figures / Tables:
Figure 1: Schematic illustration of the geometric parameters defined in the text. ΔZAg is the change in the z coordinate of the slab atoms coordinated with the adsorbate with respect to the pristine slab. dAg Ag is the Ag Ag distance of the slab atoms coordinated with the adsorbate. ZAgmore » is the vertical distance between the adsorbate atom coordinated to the slab and the slab itself. dA B refers to the intermolecular bond length(s) of the adsorbate. Color code: black - C, yellow - H, purple - Ag, cyan - Ag coordinated to adsorbate.