1
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Buceta D, Huseyinova S, Cuerva M, Lozano H, Giovanetti LJ, Ramallo-López JM, López-Caballero P, Zanchet A, Mitrushchenkov AO, Hauser AW, Barone G, Huck-Iriart C, Escudero C, Hernández-Garrido JC, Calvino JJ, López-Haro M, de Lara-Castells MP, Requejo FG, López-Quintela MA. Stability and Reversible Oxidation of Sub-Nanometric Cu 5 Metal Clusters: Integrated Experimental Study and Theoretical Modeling. Chemistry 2023; 29:e202301517. [PMID: 37204268 PMCID: PMC10946568 DOI: 10.1002/chem.202301517] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Revised: 05/17/2023] [Accepted: 05/18/2023] [Indexed: 05/20/2023]
Abstract
Sub-nanometer metal clusters have special physical and chemical properties, significantly different from those of nanoparticles. However, there is a major concern about their thermal stability and susceptibility to oxidation. In situ X-ray Absorption spectroscopy and Near Ambient Pressure X-ray Photoelectron spectroscopy results reveal that supported Cu5 clusters are resistant to irreversible oxidation at least up to 773 K, even in the presence of 0.15 mbar of oxygen. These experimental findings can be formally described by a theoretical model which combines dispersion-corrected DFT and first principles thermochemistry revealing that most of the adsorbed O2 molecules are transformed into superoxo and peroxo species by an interplay of collective charge transfer within the network of Cu atoms and large amplitude "breathing" motions. A chemical phase diagram for Cu oxidation states of the Cu5 -oxygen system is presented, clearly different from the already known bulk and nano-structured chemistry of Cu.
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Affiliation(s)
- David Buceta
- Department of Physical Chemistry, Nanomag Laboratory, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Shahana Huseyinova
- Department of Physical Chemistry, Nanomag Laboratory, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Miguel Cuerva
- Department of Physical Chemistry, Nanomag Laboratory, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Héctor Lozano
- Department of Physical Chemistry, Nanomag Laboratory, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Lisandro J Giovanetti
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Dto. de Química, Facultad de Ciencias Exactas, UNLP and CONICET, Diag. 113 y 64., 1900, La Plata, Argentina
| | - José M Ramallo-López
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Dto. de Química, Facultad de Ciencias Exactas, UNLP and CONICET, Diag. 113 y 64., 1900, La Plata, Argentina
| | | | - Alexandre Zanchet
- Instituto de Física Fundamental (AbinitSim Unit), CSIC, Serrano 123, 28006, Madrid, Spain
| | | | - Andreas W Hauser
- Institute of Experimental Physics, Graz University of Technology, Petersgasse 16, 8010, Graz, Austria
| | - Giampaolo Barone
- Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, 90128, Palermo, Italy
| | - Cristián Huck-Iriart
- Laboratorio de Cristalografía Aplicada, Escuela de Ciencia y Tecnología, Universidad Nacional de San Martín (UNSAM), Campus Miguelete, 25 de Mayo y Francia, 1650, San Martín, Provincia, Buenos Aires, Argentina
- ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290, Cerdanyola del Vallès, Barcelona, Spain
| | - Carlos Escudero
- ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290, Cerdanyola del Vallès, Barcelona, Spain
| | - Juan Carlos Hernández-Garrido
- Department of Material Science and Metallurgic Engineering and Inorganic Chemistry, Faculty of Science, University of Cádiz, 11510, Puerto Real, Cádiz, Spain
| | - José Juan Calvino
- Department of Material Science and Metallurgic Engineering and Inorganic Chemistry, Faculty of Science, University of Cádiz, 11510, Puerto Real, Cádiz, Spain
| | - Miguel López-Haro
- Department of Material Science and Metallurgic Engineering and Inorganic Chemistry, Faculty of Science, University of Cádiz, 11510, Puerto Real, Cádiz, Spain
| | | | - Félix G Requejo
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Dto. de Química, Facultad de Ciencias Exactas, UNLP and CONICET, Diag. 113 y 64., 1900, La Plata, Argentina
| | - M Arturo López-Quintela
- Department of Physical Chemistry, Nanomag Laboratory, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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2
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Zhou C, Ngan HT, Lim JS, Darbari Z, Lewandowski A, Stacchiola DJ, Kozinsky B, Sautet P, Boscoboinik JA. Dynamical Study of Adsorbate-Induced Restructuring Kinetics in Bimetallic Catalysts Using the PdAu(111) Model System. J Am Chem Soc 2022; 144:15132-15142. [PMID: 35952667 DOI: 10.1021/jacs.2c04871] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dynamic restructuring of bimetallic catalysts plays a crucial role in their catalytic activity and selectivity. In particular, catalyst pretreatment with species such as carbon monoxide and oxygen has been shown to be an effective strategy for tuning the surface composition and morphology. Mechanistic and kinetic understanding of such restructuring is fundamental to the chemistry and engineering of surface active sites but has remained challenging due to the large structural, chemical, and temporal degrees of freedom. Here, we combine time-resolved temperature-programmed infrared reflection absorption spectroscopy, ab initio thermodynamics, and machine-learning molecular dynamics to uncover previously unidentified timescale and kinetic parameters of in situ restructuring in Pd/Au(111), a highly relevant model system for dilute Pd-in-Au nanoparticle catalysts. The key innovation lies in utilizing CO not only as a chemically sensitive probe of surface Pd but also as an agent that induces restructuring of the surface. Upon annealing in vacuum, as-deposited Pd islands became encapsulated by Au and partially dissolved into the subsurface, leaving behind isolated Pd monomers on the surface. Subsequent exposure to 0.1 mbar CO enabled Pd monomers to repopulate the surface up to 373 K, above which complete Pd dissolution occurred by 473 K, with apparent activation energies of 0.14 and 0.48 eV, respectively. These restructuring processes occurred over the span of ∼1000 s at a given temperature. Such a minute-timescale dynamics not only elucidates the fluxional nature of alloy catalysts but also presents an opportunity to fine-tune the surface under moderate temperature and pressure conditions.
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Affiliation(s)
- Chen Zhou
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.,Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, United States
| | - Hio Tong Ngan
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States
| | - Jin Soo Lim
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Zubin Darbari
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.,Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11790, United States
| | - Adrian Lewandowski
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Dario J Stacchiola
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Boris Kozinsky
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.,Robert Bosch LLC, Research and Technology Center, Cambridge, Massachusetts 02139, United States
| | - Philippe Sautet
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90095, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Jorge Anibal Boscoboinik
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
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3
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Peters B. Simple Model and Spectral Analysis for a Fluxional Catalyst: Intermediate Abundances, Pathway Fluxes, Rates, and Transients. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Baron Peters
- Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States
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4
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Poths P, Alexandrova AN. Theoretical Perspective on Operando Spectroscopy of Fluxional Nanocatalysts. J Phys Chem Lett 2022; 13:4321-4334. [PMID: 35536346 DOI: 10.1021/acs.jpclett.2c00628] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Improvements in operando spectroscopy have enabled the catalysis community to investigate the dynamic nature of catalysts under operating conditions with increasing detail. Still, the highly dynamic nature of some catalysts, such as fluxional supported subnano clusters, presents a formidable challenge even for the most state-of-the-art techniques. The reason is that such fluxional catalytic interfaces contain a variety of thermally accessible states. Operando spectroscopies used in catalysis generally fall into two categories: ensemble-based techniques, which provide spectra containing the signals of the entire ensemble of states of the catalyst and are not necessarily dominated by the most active species, and localized techniques, which provide atomistic-level information about the dynamics of active sites in a very small area, which might not include the most active species. Combining many different kinds of techniques can provide detailed insight; however, we propose that effective utilization of specific computational techniques and approaches within the fluxionality paradigm can fill the gap and enable atomistic characterization of the most relevant catalytic sites.
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Affiliation(s)
- Patricia Poths
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - Anastassia N Alexandrova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
- California NanoSystems Institute, Los Angeles, California 90095, United States
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5
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Manzorro R, Xu Y, Vincent JL, Rivera R, Matteson DS, Crozier PA. Exploring Blob Detection to Determine Atomic Column Positions and Intensities in Time-Resolved TEM Images with Ultra-Low Signal-to-Noise. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:1-14. [PMID: 35343415 DOI: 10.1017/s1431927622000356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Spatially resolved in situ transmission electron microscopy (TEM), equipped with direct electron detection systems, is a suitable technique to record information about the atom-scale dynamics with millisecond temporal resolution from materials. However, characterizing dynamics or fluxional behavior requires processing short time exposure images which usually have severely degraded signal-to-noise ratios. The poor signal-to-noise associated with high temporal resolution makes it challenging to determine the position and intensity of atomic columns in materials undergoing structural dynamics. To address this challenge, we propose a noise-robust, processing approach based on blob detection, which has been previously established for identifying objects in images in the community of computer vision. In particular, a blob detection algorithm has been tailored to deal with noisy TEM image series from nanoparticle systems. In the presence of high noise content, our blob detection approach is demonstrated to outperform the results of other algorithms, enabling the determination of atomic column position and its intensity with a higher degree of precision.
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Affiliation(s)
- Ramon Manzorro
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
| | - Yuchen Xu
- Department of Statistics and Data Science, Cornell University, Ithaca, NY, USA
| | - Joshua L Vincent
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
| | - Roberto Rivera
- Department of Mathematical Sciences, University of Puerto Rico-Mayaguez, Mayaguez, Puerto Rico
| | - David S Matteson
- Department of Statistics and Data Science, Cornell University, Ithaca, NY, USA
| | - Peter A Crozier
- School for the Engineering of Matter, Transport, and Energy, Arizona State University, Engineering G Wing #301, 501 E Tyler Mall, Tempe, AZ85287, USA
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6
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Achieving industrial ammonia synthesis rates at near-ambient conditions through modified scaling relations on a confined dual site. Proc Natl Acad Sci U S A 2021; 118:2106527118. [PMID: 34282023 DOI: 10.1073/pnas.2106527118] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The production of ammonia through the Haber-Bosch process is regarded as one of the most important inventions of the 20th century. Despite significant efforts in optimizing the process, it still consumes 1 to 2% of the worldwide annual energy for the high working temperatures and pressures. The design of a catalyst with a high activity at milder conditions represents another challenge for this reaction. Herein, we combine density functional theory and microkinetic modeling to illustrate a strategy to facilitate low-temperature and -pressure ammonia synthesis through modified energy-scaling relationships using a confined dual site. Our results suggest that an ammonia synthesis rate two to three orders of magnitude higher than the commercial Ru catalyst can be achieved under the same reaction conditions with the introduction of confinement. Such strategies will open pathways for the development of catalysts for the Haber-Bosch process that can operate at milder conditions and present more economically viable alternatives to current industrial solutions.
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7
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Lushchikova OV, Tahmasbi H, Reijmer S, Platte R, Meyer J, Bakker JM. IR Spectroscopic Characterization of H 2 Adsorption on Cationic Cu n+ ( n = 4-7) Clusters. J Phys Chem A 2021; 125:2836-2848. [PMID: 33787276 PMCID: PMC8054246 DOI: 10.1021/acs.jpca.0c11527] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
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IR spectra of cationic
copper clusters Cun+ (n = 4–7) complexed with hydrogen molecules are recorded
via IR multiple-photon
dissociation (IRMPD) spectroscopy. To this end, the copper clusters
are generated via laser ablation and reacted with H2 and
D2 in a flow-tube-type reaction channel. The complexes
formed are irradiated using IR light provided by the free-electron
laser for intracavity experiments (FELICE). The spectra are interpreted
by making use of isotope-induced shifts of the vibrational bands and
by comparing them to density functional theory calculated spectra
for candidate structures. The structural candidates have been obtained
from global sampling with the minima hopping method, and spectra are
calculated at the semilocal (PBE) and hybrid (PBE0) functional level.
The highest-quality spectra have been recorded for [5Cu, 2H/2D]+, and we find that the semilocal functional provides better
agreement for the lowest-energy isomers. The interaction of hydrogen
with the copper clusters strongly depends on their size. Binding energies
are largest for Cu5+, which goes hand in hand
with the observed predominantly dissociative adsorption. Due to smaller
binding energies for dissociated H2 and D2 for
Cu4+, also a significant amount of molecular
adsorption is observed as to be expected according to the Evans–Polanyi
principle. This is confirmed by transition-state calculations for
Cu4+ and Cu5+, which show
that hydrogen dissociation is not hindered by an endothermic reaction
barrier for Cu5+ and by a slightly endothermic
barrier for Cu4+. For Cu6+ and Cu7+, it was difficult to draw clear conclusions
because the IR spectra could not be unambiguously assigned to structures.
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Affiliation(s)
- Olga V Lushchikova
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Hossein Tahmasbi
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Stijn Reijmer
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
| | - Rik Platte
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Jörg Meyer
- Leiden Institute of Chemistry, Gorlaeus Laboratories, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Joost M Bakker
- Radboud University, Institute for Molecules and Materials, FELIX Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands
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8
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Lawrence EL, Levin BDA, Boland T, Chang SLY, Crozier PA. Atomic Scale Characterization of Fluxional Cation Behavior on Nanoparticle Surfaces: Probing Oxygen Vacancy Creation/Annihilation at Surface Sites. ACS NANO 2021; 15:2624-2634. [PMID: 33507063 DOI: 10.1021/acsnano.0c07584] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Oxygen vacancy creation and annihilation are key processes in nonstoichiometric oxides such as CeO2. The oxygen vacancy creation and annihilation rates on an oxide's surface partly govern its ability to exchange oxygen with the ambient environment, which is critical for a number of applications including energy technologies, environmental pollutant remediation, and chemical synthesis. Experimental methods to probe and correlate local oxygen vacancy reaction rates with atomic-level structural heterogeneities would provide significant information for the rational design and control of surface functionality; however, such methods have been unavailable to date. Here, we characterize picoscale fluxional behavior in cations using time-resolved in situ aberration-corrected transmission electron microscopy to locate atomic-level variations in oxygen vacancy creation and annihilation rates on oxide nanoparticle surfaces. Low coordination number sites such as steps and edges, as well as locally strained sites, exhibited the greatest number of cation displacements, implying enhanced surface oxygen vacancy activity at these sites. The approach has potential applications to a much wider class of materials and catalysis problems involving surface and interfacial transport functionalities.
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Affiliation(s)
- Ethan L Lawrence
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Barnaby D A Levin
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Tara Boland
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
| | - Shery L Y Chang
- Eyring Materials Center, Arizona State University, Tempe, Arizona 85287, United States
| | - Peter A Crozier
- School for the Engineering of Matter, Transport and Energy, Arizona State University, Tempe, Arizona 85287, United States
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9
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Sun G, Fuller JT, Alexandrova AN, Sautet P. Global Activity Search Uncovers Reaction Induced Concomitant Catalyst Restructuring for Alkane Dissociation on Model Pt Catalysts. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05421] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Geng Sun
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Jack T. Fuller
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Anastassia N. Alexandrova
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- California Nano Systems Institute, Los Angeles, California 90095-1569, United States
| | - Philippe Sautet
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
- California Nano Systems Institute, Los Angeles, California 90095-1569, United States
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10
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Bhumla P, Kumar M, Bhattacharya S. Theoretical insights into C-H bond activation of methane by transition metal clusters: the role of anharmonic effects. NANOSCALE ADVANCES 2021; 3:575-583. [PMID: 36131731 PMCID: PMC9417659 DOI: 10.1039/d0na00669f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Accepted: 11/16/2020] [Indexed: 06/15/2023]
Abstract
In heterogeneous catalysis, the determination of active phases has been a long-standing challenge, as materials' properties change under operational conditions (i.e. temperature (T) and pressure (p) in an atmosphere of reactive molecules). As a first step towards materials design for methane activation, we study the T and p dependence of the composition, structure, and stability of metal oxide clusters in a reactive atmosphere at thermodynamic equilibrium using a prototypical model catalyst having wide practical applications: free transition metal (Ni) clusters in a combined oxygen and methane atmosphere. A robust methodological approach is employed, where the starting point is systematic scanning of the potential energy surface (PES) to obtain the global minimum structures using a massively parallel cascade genetic algorithm (cGA) at the hybrid density functional level. The low energy clusters are further analyzed to estimate their thermodynamic stability at realistic T, p O2 and p CH4 using ab initio atomistic thermodynamics (aiAT). To incorporate the anharmonicity in the vibrational free energy contribution to the configurational entropy, we evaluate the excess free energy of the clusters numerically by a thermodynamic integration method with ab initio molecular dynamics (aiMD) simulation inputs. By analyzing a large dataset, we show that the conventional harmonic approximation miserably fails for this class of materials, and capturing the anharmonic effects on the vibration free energy contribution is indispensable. The latter has a significant impact on detecting the activation of the C-H bond, while the harmonic infrared spectrum fails to capture this, due to the wrong prediction of the vibrational modes.
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Affiliation(s)
- Preeti Bhumla
- Department of Physics, Indian Institute of Technology Delhi New Delhi India +91 11 2658 2037 +91 11 2659 1359
| | - Manish Kumar
- Department of Physics, Indian Institute of Technology Delhi New Delhi India +91 11 2658 2037 +91 11 2659 1359
| | - Saswata Bhattacharya
- Department of Physics, Indian Institute of Technology Delhi New Delhi India +91 11 2658 2037 +91 11 2659 1359
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11
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Vandervelden CA, Khan SA, Peters B. Importance learning estimator for the site-averaged turnover frequency of a disordered solid catalyst. J Chem Phys 2020; 153:244120. [PMID: 33380094 DOI: 10.1063/5.0037450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
For disordered catalysts such as atomically dispersed "single-atom" metals on amorphous silica, the active sites inherit different properties from their quenched-disordered local environments. The observed kinetics are site-averages, typically dominated by a small fraction of highly active sites. Standard sampling methods require expensive ab initio calculations at an intractable number of sites to converge on the site-averaged kinetics. We present a new method that efficiently estimates the site-averaged turnover frequency (TOF). The new estimator uses the same importance learning algorithm [Vandervelden et al., React. Chem. Eng. 5, 77 (2020)] that we previously used to compute the site-averaged activation energy. We demonstrate the method by computing the site-averaged TOF for a simple disordered lattice model of an amorphous catalyst. The results show that with the importance learning algorithm, the site-averaged TOF and activation energy can now be obtained concurrently with orders of magnitude reduction in required ab initio calculations.
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Affiliation(s)
- Craig A Vandervelden
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Salman A Khan
- Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, USA
| | - Baron Peters
- Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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12
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Nair AS, Pathak B. Computational strategies to address the catalytic activity of nanoclusters. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2020. [DOI: 10.1002/wcms.1508] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Akhil S. Nair
- Discipline of Chemistry Indian Institute of Technology Indore Indore Madhya Pradesh India
| | - Biswarup Pathak
- Discipline of Chemistry Indian Institute of Technology Indore Indore Madhya Pradesh India
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13
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Lim JS, Vandermause J, van Spronsen MA, Musaelian A, Xie Y, Sun L, O’Connor CR, Egle T, Molinari N, Florian J, Duanmu K, Madix RJ, Sautet P, Friend CM, Kozinsky B. Evolution of Metastable Structures at Bimetallic Surfaces from Microscopy and Machine-Learning Molecular Dynamics. J Am Chem Soc 2020; 142:15907-15916. [DOI: 10.1021/jacs.0c06401] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Jin Soo Lim
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jonathan Vandermause
- Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Matthijs A. van Spronsen
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
- Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Albert Musaelian
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Yu Xie
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Lixin Sun
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Christopher R. O’Connor
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Tobias Egle
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Nicola Molinari
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Jacob Florian
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Kaining Duanmu
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Robert J. Madix
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Philippe Sautet
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Cynthia M. Friend
- Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Boris Kozinsky
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Robert Bosch LLC, Research and Technology Center, Cambridge, Massachusetts 02142, United States
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14
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Doherty F, Wang H, Yang M, Goldsmith BR. Nanocluster and single-atom catalysts for thermocatalytic conversion of CO and CO2. Catal Sci Technol 2020. [DOI: 10.1039/d0cy01316a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
We highlight different aspects of single-atom and nanocluster catalysts for CO2 reduction and CO oxidation, including synthesis, dynamic restructuring, and trends in activity and selectivity.
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Affiliation(s)
- Francis Doherty
- Department of Chemical Engineering
- University of Michigan
- Ann Arbor
- USA
- Catalysis Science and Technology Institute
| | - Hui Wang
- International Joint Research Laboratory of Materials Microstructure
- Institute for New Energy Materials & Low Carbon Technologies
- School of Materials Science and Engineering
- Tianjin University of Technology
- Tianjin
| | - Ming Yang
- Chemical and Materials Systems Laboratory
- General Motors Global Research and Development
- Warren
- USA
- Department of Chemical and Biomolecular Engineering
| | - Bryan R. Goldsmith
- Department of Chemical Engineering
- University of Michigan
- Ann Arbor
- USA
- Catalysis Science and Technology Institute
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15
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Xu J, Huang H, Hu P. An approach to calculate the free energy changes of surface reactions using free energy decomposition on ab initio brute-force molecular dynamics trajectories. Phys Chem Chem Phys 2020; 22:21340-21349. [DOI: 10.1039/d0cp03852k] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
To understand the mechanisms and kinetics of catalytic reactions in heterogeneous catalysis, ab initio molecular dynamics is one of the powerful methods used to explore the free energy surface (FES) of surface elementary steps.
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Affiliation(s)
- Jiayan Xu
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
| | - Hao Huang
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
| | - P. Hu
- School of Chemistry and Chemical Engineering
- Queen's University Belfast
- Belfast BT9 5AG
- UK
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