1
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Westawker LP, Khusnutdinova JK, Wallick RF, Mirica LM. Palladium K-edge X-ray Absorption Spectroscopy Studies on Controlled Ligand Systems. Inorg Chem 2023; 62:21128-21137. [PMID: 38039413 DOI: 10.1021/acs.inorgchem.3c03032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2023]
Abstract
X-ray absorption spectroscopy (XAS) is widely used across the life and physical sciences to identify the electronic properties and structure surrounding a specific element. XAS is less often used for the characterization of organometallic compounds, especially for sensitive and highly reactive species. In this study, we used solid- and solution-phase XAS to compare a series of 25 palladium complexes in controlled ligand environments. The compounds include palladium centers in the formal I, II, III, and IV oxidation states, supported by tridentate and tetradentate macrocyclic ligands, with different halide and methyl ligand combinations. The Pd K-edge energies increased not only upon oxidizing the metal center but also upon increasing the denticity of the ligand framework, substituting sigma-donating methyl groups with chlorides, and increasing the charge of the overall metal complex by replacing charged ligands with neutral ligands. These trends were then applied to characterize compounds whose oxidation states were otherwise unconfirmed.
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Affiliation(s)
- Luke P Westawker
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Julia K Khusnutdinova
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Rachel F Wallick
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
| | - Liviu M Mirica
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois 61801, United States
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2
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Sumaria V, Nguyen L, Tao FF, Sautet P. Atomic-Scale Mechanism of Platinum Catalyst Restructuring under a Pressure of Reactant Gas. J Am Chem Soc 2023; 145:392-401. [PMID: 36548635 DOI: 10.1021/jacs.2c10179] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Heterogeneous catalysis is key for chemical transformations. Understanding how catalysts' active sites dynamically evolve at the atomic scale under reaction conditions is a prerequisite for accurately determining catalytic mechanisms and predictably developing catalysts. We combine in situ time-dependent scanning tunneling microscopy observations and machine-learning-accelerated first-principles atomistic simulations to uncover the mechanism of restructuring of Pt catalysts under a pressure of carbon monoxide (CO). We show that a high CO coverage at a Pt step edge triggers the formation of atomic protrusions of low-coordination Pt atoms, which then detach from the step edge to create sub-nano-islands on the terraces, where under-coordinated sites are stabilized by the CO adsorbates. The fast and accurate machine-learning potential is key to enabling the exploration of tens of thousands of configurations for the CO-covered restructuring catalyst. These studies open an avenue to achieve an atomic-scale understanding of the structural dynamics of more complex metal nanoparticle catalysts under reaction conditions.
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Affiliation(s)
- Vaidish Sumaria
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90094, United States
| | - Luan Nguyen
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
| | - Franklin Feng Tao
- Department of Chemical and Petroleum Engineering, University of Kansas, Lawrence, Kansas 66045, United States
| | - Philippe Sautet
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, California 90094, United States.,Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90094, United States
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3
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Alizadehfanaloo S, Garrevoet J, Seyrich M, Murzin V, Becher J, Doronkin DE, Sheppard TL, Grunwaldt JD, Schroer CG, Schropp A. Tracking dynamic structural changes in catalysis by rapid 2D-XANES microscopy. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:1518-1527. [PMID: 34475299 PMCID: PMC8415324 DOI: 10.1107/s1600577521007074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/09/2021] [Indexed: 05/22/2023]
Abstract
Many processes and materials in heterogeneous catalysis undergo dynamic structural changes depending on their chemical environment. Monitoring such dynamic changes can be challenging using conventional spectroscopic characterization tools, due to the high time resolution required. Here, a high-resolution 2D X-ray camera operating at 50 Hz full-frame rate was synchronized with a QEXAFS monochromator, enabling rapid spectro-microscopic imaging with chemical contrast over individual pixels. This was used to monitor chemical gradients within a model Pt/Al2O3 catalyst during catalytic partial oxidation of methane to synthesis gas. The transition from methane combustion (partly oxidized Pt) to combustion-reforming and partial oxidation (fully reduced Pt) was observed by a characteristic reduction front, which progressed from the end of the catalyst bed towards its beginning on the second time scale. The full-field QEXAFS imaging method applied here allows acquisition of entire XANES spectra `on the fly' in a rapid and spatially resolved manner. The combination of high spatial and temporal resolution with spectroscopic data offers new opportunities for observing dynamic processes in catalysts and other functional materials at work. The methodology is flexible and can be applied at beamlines equipped with a QEXAFS or other fast-scanning monochromators and a suitable sample environment for gas phase analytics to allow for catalytic studies at the same time.
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Affiliation(s)
- Saba Alizadehfanaloo
- CXNS - Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
| | - Jan Garrevoet
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
| | - Martin Seyrich
- CXNS - Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
| | - Vadim Murzin
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
| | - Johannes Becher
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, DE-76131 Karlsruhe, Germany
| | - Dmitry E Doronkin
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, DE-76131 Karlsruhe, Germany
| | - Thomas L Sheppard
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, DE-76131 Karlsruhe, Germany
| | - Jan Dierk Grunwaldt
- Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Engesserstraße 20, DE-76131 Karlsruhe, Germany
| | - Christian G Schroer
- CXNS - Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
| | - Andreas Schropp
- CXNS - Center for X-ray and Nano Science, Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, DE-22607 Hamburg, Germany
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4
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Lahiri D, Dwivedi A, Vasanthi R, Jha SN, Garg N. First high-pressure XAFS results at the bending-magnet-based energy-dispersive XAFS beamline BL-8 at the Indus-2 synchrotron facility. JOURNAL OF SYNCHROTRON RADIATION 2020; 27:988-998. [PMID: 33566008 DOI: 10.1107/s1600577520006098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Accepted: 05/04/2020] [Indexed: 06/12/2023]
Abstract
The static focusing optics of the existing energy-dispersive XAFS beamline BL-8 have been advantageously exploited to initiate diamond anvil cell based high-pressure XANES experiments at the Indus-2 synchrotron facility, India. In the framework of the limited photon statistics with the 2.5 GeV bending-magnet source, limited focusing optics and 4 mm-thick diamond windows of the sample cell, a (non-trivial) beamline alignment method for maximizing photon statistics at the sample position has been designed. Key strategies include the selection of a high X-ray energy edge, the truncation of the smallest achievable focal spot size to target size with a slit and optimization of the horizontal slit position for transmission of the desired energy band. A motor-scanning program for precise sample centering has been developed. These details are presented with rationalization for every step. With these strategies, Nb K-edge XANES spectra for Nb2O5 under high pressure (0-16.9 GPa) have been generated, reproducing the reported spectra for Nb2O5 under ambient conditions and high pressure. These first HPXANES results are reported in this paper. The scope of extending good data quality to the EXAFS range in the future is addressed. This work should inspire and guide future high-pressure XAFS experiments with comparable infrastructure.
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Affiliation(s)
- Debdutta Lahiri
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ashutosh Dwivedi
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - R Vasanthi
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Nandini Garg
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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5
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Yoshida T, Bera MK, Narayana YSLV, Mondal S, Abe H, Higuchi M. Electrochromic Os-based metallo-supramolecular polymers: electronic state tracking by in situ XAFS, IR, and impedance spectroscopies. RSC Adv 2020; 10:24691-24696. [PMID: 35516189 PMCID: PMC9055175 DOI: 10.1039/d0ra03236k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Accepted: 06/09/2020] [Indexed: 01/08/2023] Open
Abstract
In this study, the electronic states of Os-based metallo-supramolecular polymers (poly(OsL)2+) during electrochromism were tracked by in situ X-ray absorption fine structure (XAFS), infrared (IR), and impedance spectroscopies. The XAFS spectra suggested electronic charge migration in the polymer, and the in situ spectra revealed reversible changes caused by electrochemical redox reactions. The IR spectra of the polymers showed an IVCT band, and we also confirmed the reversible changes by applying a voltage to the redox cell. During the impedance measurements, we found a drastic decrease in the charge transfer resistance (RCT) of the polymer films near the electrochemical redox potential. In this study, the electronic states of Os-based metallo-supramolecular polymers (poly(OsL)2+) during electrochromism were tracked by in situ X-ray absorption fine structure (XAFS), infrared (IR), and impedance spectroscopies.![]()
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Affiliation(s)
- Takefumi Yoshida
- Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
| | - Manas Kumar Bera
- Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
| | - Yemineni S L V Narayana
- Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
| | - Sanjoy Mondal
- Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
| | - Hitoshi Abe
- Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Department of Materials Structure Science, School of High Energy Accelerator Science, SOKENDAI (The Graduate University for Advanced Studies) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan.,Graduate School of Science and Technology, Ibaraki University 2-1-1 Bunkyo Mito Ibaraki 310-8512 Japan
| | - Masayoshi Higuchi
- Electronic Functional Macromolecules Group, National Institute for Materials Science (NIMS) Tsukuba 305-0044 Japan
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6
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Kammert JD, Brezicki G, Acevedo-Esteves R, Stavitski E, Davis RJ. High-throughput operando-ready X-ray absorption spectroscopy flow reactor cell for powder samples. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:013107. [PMID: 32012544 DOI: 10.1063/1.5124301] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
A high-throughput, operando-ready X-ray absorption spectroscopy catalytic reaction cell consisting of 4 parallel reactors was designed to collect X-ray absorption near edge structure and extended fine structure spectra under reaction conditions. The cell is capable of operating at temperatures from ambient conditions up to 773 K and pressures from ambient to 2 MPa in a variety of gas environments. The cell design is mechanically simple, and programmable operation at beamline 8-ID (NSLS-II, Brookhaven National Laboratory) makes it straightforward to use. Reactor tube parts were available as-fabricated from commercial sources, while the heating jacket and cell mounting required custom machining.
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Affiliation(s)
- James D Kammert
- Department of Chemical Engineering, University of Virginia, 102 Engineer's Way, P.O. Box 400741, Charlottesville, Virginia 22904-4741, USA
| | - Gordon Brezicki
- Department of Chemical Engineering, University of Virginia, 102 Engineer's Way, P.O. Box 400741, Charlottesville, Virginia 22904-4741, USA
| | - Raul Acevedo-Esteves
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Eli Stavitski
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, New York 11973, USA
| | - Robert J Davis
- Department of Chemical Engineering, University of Virginia, 102 Engineer's Way, P.O. Box 400741, Charlottesville, Virginia 22904-4741, USA
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7
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Xu Y, Hirano T, Kunieda H, Hara Y, Miyata Y. Enhancing the methane steam reforming catalytic performance of Ni monolithic catalysts via Ni–Re surface alloying. Catal Sci Technol 2020. [DOI: 10.1039/c9cy02539a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methane steam reforming catalytic performance of Ni monolithic catalysts was effectively enhanced by coating of a Ni–Re bimetallic layer because the Re atoms promoted hydrogen adsorption, thereby suppressing the oxidation of the adjacent Ni atoms.
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Affiliation(s)
- Ya Xu
- National Institute for Materials Science
- Ibaraki 305-0047
- Japan
| | | | | | - Yuta Hara
- Hiroshima Co. Ltd
- Nagoya 459-8001
- Japan
| | - Yasushi Miyata
- Nagoya Municipal Industrial Research Institute
- Nagoya 456-0058
- Japan
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8
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Steib M, Lou Y, Jentys A, Lercher JA. Enhanced Activity in Methane Dry Reforming by Carbon Dioxide Induced Metal-Oxide Interface Restructuring of Nickel/Zirconia. ChemCatChem 2017. [DOI: 10.1002/cctc.201700686] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Matthias Steib
- Department of Chemistry and Catalysis Research Center; Technische Universität München; Lichtenbergstraße 4 85748 Garching Germany
| | - Yu Lou
- Department of Chemistry and Catalysis Research Center; Technische Universität München; Lichtenbergstraße 4 85748 Garching Germany
| | - Andreas Jentys
- Department of Chemistry and Catalysis Research Center; Technische Universität München; Lichtenbergstraße 4 85748 Garching Germany
| | - Johannes A. Lercher
- Department of Chemistry and Catalysis Research Center; Technische Universität München; Lichtenbergstraße 4 85748 Garching Germany
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9
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Buzanich AG, Radtke M, Reinholz U, Riesemeier H, Emmerling F. Time- and spatial-resolved XAFS spectroscopy in a single shot: new analytical possibilities for in situ material characterization. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:769-776. [PMID: 27140157 DOI: 10.1107/s1600577516003969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 03/08/2016] [Indexed: 06/05/2023]
Abstract
A new concept that comprises both time- and lateral-resolved X-ray absorption fine-structure information simultaneously in a single shot is presented. This uncomplicated set-up was tested at the BAMline at BESSY-II (Berlin, Germany). The primary broadband beam was generated by a double multilayer monochromator. The transmitted beam through the sample is diffracted by a convexly bent Si (111) crystal, producing a divergent beam. This, in turn, is collected by either an energy-sensitive area detector, the so-called color X-ray camera, or by an area-sensitive detector based on a CCD camera, in θ-2θ geometry. The first tests were performed with thin metal foils and some iron oxide mixtures. A time resolution of lower than 1 s together with a spatial resolution in one dimension of at least 50 µm is achieved.
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Affiliation(s)
- Ana Guilherme Buzanich
- Federal Institute for Materials Research and Testing (BAM), Division 1.3 Structure Analysis, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
| | - Martin Radtke
- Federal Institute for Materials Research and Testing (BAM), Division 1.3 Structure Analysis, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
| | - Uwe Reinholz
- Federal Institute for Materials Research and Testing (BAM), Division 1.3 Structure Analysis, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
| | - Heinrich Riesemeier
- Federal Institute for Materials Research and Testing (BAM), Division 1.3 Structure Analysis, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
| | - Franziska Emmerling
- Federal Institute for Materials Research and Testing (BAM), Division 1.3 Structure Analysis, Richard-Willstaetter-Strasse 11, 12489 Berlin, Germany
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10
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11
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Abstract
A heterogeneous catalyst is a functional material that continually creates active sites with its reactants under reaction conditions. These sites change the rates of chemical reactions of the reactants localized on them without changing the thermodynamic equilibrium between the materials.
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Affiliation(s)
- Robert Schlögl
- Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin (Germany) http://www.fhi-berlin.mpg.de http://www.cec.mpg.de; Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, 45470 Mülheim a.d. Ruhr (Germany).
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12
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Seidler GT, Mortensen DR, Remesnik AJ, Pacold JI, Ball NA, Barry N, Styczinski M, Hoidn OR. A laboratory-based hard x-ray monochromator for high-resolution x-ray emission spectroscopy and x-ray absorption near edge structure measurements. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:113906. [PMID: 25430123 DOI: 10.1063/1.4901599] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Accepted: 11/03/2014] [Indexed: 05/22/2023]
Abstract
We report the development of a laboratory-based Rowland-circle monochromator that incorporates a low power x-ray (bremsstrahlung) tube source, a spherically bent crystal analyzer, and an energy-resolving solid-state detector. This relatively inexpensive, introductory level instrument achieves 1-eV energy resolution for photon energies of ∼5 keV to ∼10 keV while also demonstrating a net efficiency previously seen only in laboratory monochromators having much coarser energy resolution. Despite the use of only a compact, air-cooled 10 W x-ray tube, we find count rates for nonresonant x-ray emission spectroscopy comparable to those achieved at monochromatized spectroscopy beamlines at synchrotron light sources. For x-ray absorption near edge structure, the monochromatized flux is small (due to the use of a low-powered x-ray generator) but still useful for routine transmission-mode studies of concentrated samples. These results indicate that upgrading to a standard commercial high-power line-focused x-ray tube or rotating anode x-ray generator would result in monochromatized fluxes of order 10(6)-10(7) photons/s with no loss in energy resolution. This work establishes core technical capabilities for a rejuvenation of laboratory-based hard x-ray spectroscopies that could have special relevance for contemporary research on catalytic or electrical energy storage systems using transition-metal, lanthanide, or noble-metal active species.
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Affiliation(s)
- G T Seidler
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - D R Mortensen
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - A J Remesnik
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - J I Pacold
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - N A Ball
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - N Barry
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - M Styczinski
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
| | - O R Hoidn
- Physics Department, University of Washington, Seattle, Washington 98195-1560, USA
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13
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Gorczyca A, Moizan V, Chizallet C, Proux O, Del Net W, Lahera E, Hazemann JL, Raybaud P, Joly Y. Monitoring morphology and hydrogen coverage of nanometric Pt/γ-Al2 O3 particles by in situ HERFD-XANES and quantum simulations. Angew Chem Int Ed Engl 2014; 53:12426-9. [PMID: 25056683 DOI: 10.1002/anie.201403585] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Indexed: 12/22/2022]
Abstract
Platinum nanoclusters highly dispersed on γ-alumina are widely used as heterogeneous catalysts. To understand the chemical interplay between the Pt nanoparticles, the support, and the reductive atmosphere, we performed X-ray absorption near edge structure (XANES) in situ experiments recorded in high energy resolution fluorescence detection (HERFD) mode. Spectra are assigned by comparison with simulated XANES spectra on models obtained by molecular dynamics (DFT-MD). We propose platinum cluster morphologies and quantify the hydrogen coverages compatible with XANES spectra recorded at variable hydrogen pressures and temperatures. Using cutting-edge methodologies to assign XANES spectra, this work gives unequalled atomic insights into the characterization of supported nanoclusters.
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Affiliation(s)
- Agnes Gorczyca
- IFP Energies nouvelles 69360 Solaize (France); Univ. Grenoble Alpes Inst NEEL, 38042 Grenoble (France); CNRS, Inst NEEL, 38042 Grenoble (France)
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14
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Gorczyca A, Moizan V, Chizallet C, Proux O, Del Net W, Lahera E, Hazemann JL, Raybaud P, Joly Y. Monitoring Morphology and Hydrogen Coverage of Nanometric Pt/γ-Al2O3Particles by In Situ HERFD-XANES and Quantum Simulations. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403585] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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15
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16
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XAFS Applications on Polymers and Related Materials. ACTA POLYM SIN 2014. [DOI: 10.3724/sp.j.1105.2014.13303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Stötzel J, Lützenkirchen-Hecht D, Grunwaldt JD, Frahm R. T-REX: new software for advanced QEXAFS data analysis. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:920-929. [PMID: 23093750 DOI: 10.1107/s0909049512038599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2012] [Accepted: 09/08/2012] [Indexed: 06/01/2023]
Abstract
New approaches to analyze the data generated by modern time-resolved X-ray absorption spectroscopy instrumentation are presented as part of a new analysis software to handle files containing typically a few thousand EXAFS spectra. Various filter techniques to remove high-frequency noise and run-away values are discussed as well as advanced analysis tools like linear combination fitting, EXAFS fitting, principal component analysis and phase-sensitive detection. These techniques were implemented in a user-friendly graphical user interface to analyse huge data files where it is not possible to treat each spectrum separately. New ideas to exploit existent tools more efficiently for time-resolved EXAFS data analysis are discussed theoretically as well as applied to real measurements, especially in situ catalytic experiments and surface-sensitive reflection-mode X-ray absorption studies of thin film growth.
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Affiliation(s)
- Jan Stötzel
- Fachbereich C-Physik, Universität Wuppertal, Wuppertal, Germany.
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18
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Shimizu KI, Kamiya Y, Osaki K, Yoshida H, Satsuma A. The average Pd oxidation state in Pd/SiO2 quantified by L3-edge XANES analysis and its effects on catalytic activity for CO oxidation. Catal Sci Technol 2012. [DOI: 10.1039/c2cy00422d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Nelson RC, Miller JT. An introduction to X-ray absorption spectroscopy and its in situ application to organometallic compounds and homogeneous catalysts. Catal Sci Technol 2012. [DOI: 10.1039/c2cy00343k] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Lab Scale Fixed-Bed Reactor for Operando X-Ray Absorption Spectroscopy for Structure Activity Studies of Supported Metal Oxide Catalysts. Top Catal 2011. [DOI: 10.1007/s11244-011-9745-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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