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Borodin D, Rahinov I, Galparsoro O, Fingerhut J, Schwarzer M, Golibrzuch K, Skoulatakis G, Auerbach DJ, Kandratsenka A, Schwarzer D, Kitsopoulos TN, Wodtke AM. Kinetics of NH 3 Desorption and Diffusion on Pt: Implications for the Ostwald Process. J Am Chem Soc 2021; 143:18305-18316. [PMID: 34672570 PMCID: PMC8569812 DOI: 10.1021/jacs.1c09269] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
We report accurate time-resolved measurements of NH3 desorption from Pt(111) and Pt(332) and use these results to determine elementary rate constants for desorption from steps, from (111) terrace sites and for diffusion on (111) terraces. Modeling the extracted rate constants with transition state theory, we find that conventional models for partition functions, which rely on uncoupled degrees of freedom (DOFs), are not able to reproduce the experimental observations. The results can be reproduced using a more sophisticated partition function, which couples DOFs that are most sensitive to NH3 translation parallel to the surface; this approach yields accurate values for the NH3 binding energy to Pt(111) (1.13 ± 0.02 eV) and the diffusion barrier (0.71 ± 0.04 eV). In addition, we determine NH3's binding energy preference for steps over terraces on Pt (0.23 ± 0.03 eV). The ratio of the diffusion barrier to desorption energy is ∼0.65, in violation of the so-called 12% rule. Using our derived diffusion/desorption rates, we explain why established rate models of the Ostwald process incorrectly predict low selectivity and yields of NO under typical reactor operating conditions. Our results suggest that mean-field kinetics models have limited applicability for modeling the Ostwald process.
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Affiliation(s)
- Dmitriy Borodin
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Igor Rahinov
- Department of Natural Sciences, The Open University of Israel, 4353701 Raanana, Israel
| | - Oihana Galparsoro
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain.,Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, P.K. 1072 Donostia-San Sebastián, Spain
| | - Jan Fingerhut
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Michael Schwarzer
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
| | - Kai Golibrzuch
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Georgios Skoulatakis
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Daniel J Auerbach
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Alexander Kandratsenka
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Dirk Schwarzer
- Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany
| | - Theofanis N Kitsopoulos
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,Department of Chemistry, University of Crete, 71003 Heraklion, Greece.,Institute of Electronic Structure and Laser - FORTH, 71110 Heraklion, Greece
| | - Alec M Wodtke
- Institute for Physical Chemistry, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany.,Department of Dynamics at Surfaces, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Goettingen, Germany.,International Center for Advanced Studies of Energy Conversion, Georg-August University of Goettingen, Tammannstraße 6, 37077 Goettingen, Germany
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2
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Alducin M, Camillone N, Hong SY, Juaristi JI. Electrons and Phonons Cooperate in the Laser-Induced Desorption of CO from Pd(111). PHYSICAL REVIEW LETTERS 2019; 123:246802. [PMID: 31922860 DOI: 10.1103/physrevlett.123.246802] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Indexed: 06/10/2023]
Abstract
Femtosecond laser induced desorption of CO from a CO-covered Pd(111) surface is investigated with ab initio molecular dynamics with electronic friction that incorporates effects due to the excited electronic and phononic systems, as well as out-of-phase coadsorbate interactions. Our simulations show evidence of an important electron-phonon synergy in promoting CO desorption that has largely been neglected in other similar systems. At the saturated coverage of 0.75 ML, effects due to CO-CO interadsorbate energy exchange are also important. Our dynamics simulations, in concert with site-specific desorption energy calculations, allow us to understand the large coverage dependence of the desorption yields observed in experiments.
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Affiliation(s)
- Maite Alducin
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
| | - Nicholas Camillone
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - Sung-Young Hong
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
| | - J Iñaki Juaristi
- Centro de Física de Materiales CFM/MPC (CSIC-UPV/EHU), Paseo Manuel de Lardizabal 5, 20018 Donostia-San Sebastián, Spain
- Donostia International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
- Departamento de Física de Materiales, Facultad de Químicas (UPV/EHU), Apartado 1072, 20080 Donostia-San Sebastián, Spain
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3
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Hong SY, Xu P, Camillone NR, White MG, Camillone N. Adlayer structure dependent ultrafast desorption dynamics in carbon monoxide adsorbed on Pd (111). J Chem Phys 2017; 145:014704. [PMID: 27394118 DOI: 10.1063/1.4954408] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
We report our ultrafast photoinduced desorption investigation of the coverage dependence of substrate-adsorbate energy transfer in carbon monoxide adlayers on the (111) surface of palladium. As the CO coverage is increased, the adsorption site population shifts from all threefold hollows (up to 0.33 ML), to bridge and near bridge (>0.5 to 0.6 ML) and finally to mixed threefold hollow plus top site (at saturation at 0.75 ML). We show that between 0.24 and 0.75 ML this progression of binding site motifs is accompanied by two remarkable features in the ultrafast photoinduced desorption of the adsorbates: (i) the desorption probability increases roughly two orders magnitude, and (ii) the adsorbate-substrate energy transfer rate observed in two-pulse correlation experiments varies nonmonotonically, having a minimum at intermediate coverages. Simulations using a phenomenological model to describe the adsorbate-substrate energy transfer in terms of frictional coupling indicate that these features are consistent with an adsorption-site dependent electron-mediated energy coupling strength, ηel, that decreases with binding site in the order: three-fold hollow > bridge and near bridge > top site. This weakening of ηel largely counterbalances the decrease in the desorption activation energy that accompanies this progression of adsorption site motifs, moderating what would otherwise be a rise of several orders of magnitude in the desorption probability. Within this framework, the observed energy transfer rate enhancement at saturation coverage is due to interadsorbate energy transfer from the copopulation of molecules bound in three-fold hollows to their top-site neighbors.
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Affiliation(s)
- Sung-Young Hong
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Pan Xu
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794, USA
| | - Nina R Camillone
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Michael G White
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Nicholas Camillone
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973, USA
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4
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Szymanski P, Harris AL, Camillone N. Adsorption-state-dependent subpicosecond photoinduced desorption dynamics. J Chem Phys 2007; 126:214709. [PMID: 17567215 DOI: 10.1063/1.2735594] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Femtosecond laser excitation has been used to initiate desorption of molecular oxygen from the (111) surface of Pd and to study the adsorption-state dependence of the substrate-adsorbate coupling. The relative populations of the two chemical states, peroxo (O2(2-)) and superoxo (O2-), were varied by changing the total coverage. Two-pulse correlation measurements exhibit a dominant 400 fs response and a slower 10 ps decay that are relatively independent of the initial O2 coverage. In contrast, the photodesorption yield and the nonlinearity of the fluence dependence show a systematic coverage dependence. The coverage-independent subpicosecond response indicates that the photoinduced desorption from the two states is driven primarily by the same electron-mediated mechanism, while the coverage dependence of the yield indicates that the desorption efficiency from the superoxo state is greater than that from the peroxo state. These results are discussed in the context of the electron-phonon two-temperature model with an empirical adsorbate-electron frictional coupling that depends on both the electronic temperature and the activation energy for desorption. With a coupling strength that decreases as the activation energy decreases, the trends with varying coverage, absorbed fluence, and time delay can all be reproduced. The model is consistent with a transition from a resonantly enhanced (diabatic) regime to an adiabatic regime as the system relaxes, accounting for the biexponential correlation behavior.
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Affiliation(s)
- Paul Szymanski
- Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973-5000
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Saalfrank P. Quantum Dynamical Approach to Ultrafast Molecular Desorption from Surfaces. Chem Rev 2006; 106:4116-59. [PMID: 17031982 DOI: 10.1021/cr0501691] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter Saalfrank
- Theoretische Chemie, Institut für Chemie, Universität Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
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Stépán K, Güdde J, Höfer U. Time-resolved measurement of surface diffusion induced by femtosecond laser pulses. PHYSICAL REVIEW LETTERS 2005; 94:236103. [PMID: 16090486 DOI: 10.1103/physrevlett.94.236103] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2005] [Indexed: 05/03/2023]
Abstract
Diffusion of atomic oxygen on a vicinal Pt111 surface induced by femtosecond laser pulses has been studied using optical second-harmonic generation as a sensitive in situ probe of the step coverage. Time-resolved studies of the hopping rate for step-terrace diffusion with a two-pulse correlation scheme reveal a time constant of 1.5 ps for the energy transfer from the electronic excitation of the substrate to the frustrated translations of the adsorbate.
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Affiliation(s)
- K Stépán
- Fachbereich Physik und Zentrum für Materialwissenschaften, Philipps-Universität, D-35032 Marburg, Germany
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Mishina ED, Tsirlina GA, Timofeeva EV, Sherstyuk NE, Borzenko MI, Tanimura N, Nakabayashi S, Petrii OA. Adlayers of Keggin Type Polytungstate Anions on Platinum: Negligible Electrochemical Signatures and Manifestations of “Molecular UPD”. J Phys Chem B 2004. [DOI: 10.1021/jp047470q] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Elena D. Mishina
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Galina A. Tsirlina
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Elena V. Timofeeva
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Nataliya E. Sherstyuk
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Marina I. Borzenko
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Nobuko Tanimura
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Seiichiro Nakabayashi
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
| | - Oleg A. Petrii
- Moscow Institute of Radioengineering, Electronics and Automation, prosp. Vernadskogo, 78, 117454 Moscow, Russia, Department of Electrochemistry, Moscow State University, Leninskie Gory 1-str.3, 119992 Moscow, Russia, and Department of Chemistry, Faculty of Science, Saitama University, Saitama 338-8570, Japan
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