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Günther Rupprechter

From Wikipedia, the free encyclopedia

Günther Rupprechter
BornJuly 1, 1966 (1966-07) (age 57)
Jenbach, Austria
CitizenshipAustrian
Alma materUniversity of Innsbruck
Known forPhysical chemistry, Surface science, Nanoscience, Nanotechnology
AwardsJochen Block Award of the German Catalysis Society (DECHEMA)

Austrian Academy of Sciences (ÖAW)

European Academy of Sciences (EurASc)
Scientific career
InstitutionsTechnische Universität Wien

Technical University Berlin

Fritz Haber Institute Max Planck Society

Lawrence Berkeley National Laboratory

University of California at Berkeley

University of Innsbruck
Websitehttps://www.tuwien.at/tch/imc

Professor Günther Rupprechter (born July 1, 1966, in Jenbach, Austria) is a distinguished Austrian scientist, full professor and currently Head of the Institute of Materials Chemistry,[1] Technische Universität Wien (TU Wien). He is renowned for his contributions to the fields of physical chemistry, surface science, nanoscience and nanotechnology, particularly in the area of catalytic surface reactions on heterogeneous catalysts, identifying fundamental reaction steps at the atomic level by in situ and operando spectroscopy and microscopy.

Rupprechter is “Director of Research” (speaker) of the FWF-funded Cluster of Excellence[2] “Materials for Energy Conversion and Storage (COE MECS)”,[3] including 19 research groups at 4 Austrian universities/institutions. The COE MECS (2023-2028, with an option of extension to 2033) is one of three COEs in the natural sciences (among five first Clusters of Excellence in Austria[2]).

Education

Günther Rupprechter earned a Master of Science in Chemistry (Mag. rer. nat.) with summa cum laude honors from the University of Innsbruck, Austria, in 1992. In his Ph.D. in Physical Chemistry (Dr. rer. nat.), he worked with Konrad Hayek (a nephew of Noble Laureate Friedrich August von Hayek) at the Institute of Physical Chemistry of the University of Innsbruck, Austria, an institute well known for its pioneer in gas chromatography, Erika Cremer. Rupprechter studied nanocatalysts[4][5] by high resolution electron microscopy and got his Ph.D. in 1996, also with summa cum laude honors. Part of the thesis work was carried out at the then just founded Max Planck Institute of Microstructure Physics (Halle an der Saale, Germany) within two research stays.

Career

After Postdoctoral research at the Department of Chemistry, University of California at Berkeley and E.O. Lawrence Berkeley National Laboratory (1996–1998 with Prof. Gábor A. Somorjai), Rupprechter became Group Leader for Laser Spectroscopy & Catalysis (1998-2006) at the Fritz Haber Institute, Max Planck Society, Chemical Physics Department, Berlin, Germany, directed by Prof. Hans-Joachim Freund.[6] In 2005, he was awarded a Habilitation in Physical Chemistry from the Technical University Berlin, Germany. In the same year, Rupprechter was appointed Professor (chair) of Surface & Interface Chemistry at the Institute of Materials Chemistry,[1] Technische Universität Wien (TU Wien), Austria. Since 2010, he is Head of the institute.[1]

Research

Rupprechter's current research interests are primarily focused on catalytic surface reactions on heterogeneous catalysts. His research group[7] employs a four-pronged approach:

  1. Surface-Science-Based Model Catalysts: Prof. Rupprechter's work on planar model catalysts aims to understand fundamental processes that occur on catalytic surfaces via in situ/operando surface spectroscopy and microscopy,[8] bridging both the materials and pressure gaps.[9]
  2. Atomically Precise Clusters: He investigates atomically precise clusters to gain insights and control the behavior of catalytic materials at the atomic scale.
  3. Industrial-Grade Nanomaterials: His research extends to the study of industrial-grade nanomaterials, which have practical applications in various catalytic processes.
  4. Microkinetic Modeling and Simulation: The interpretation and verification of the obtained experimental operando spectra/images/patterns typically rely on theoretical support.

Rupprechter's overarching goal is to elucidate the molecular mechanisms of various reactions relevant to a clean environment, energy conversion, and efficient resource utilization. Among others, molecular mechanisms of hydrogen as clean fuel, methane reforming, CO2 and olefin hydrogenation, efficient automotive catalysis, and waste valorization were studied. Materials of interest include mono- (Pt, Pd, Rh, Cu, Ni, Au, Co) and bimetallic (PdZn, Pd2Ga, PdCu, CuNi, CuZn, PdAu, AgAu, CuAu, RhAu) nanoparticles on supporting (mixed) oxides (Al2O3, SiO2, CeO2, PrO2, ZrO2, TiO2, ZnO, MgO, Ga2O3, Co3O4), perovskites (LCO, LSF), and carbon (HOPG, GR, GR-NPs).

Academic Leadership

From 2011 to 2019, Rupprechter served as the Speaker/Coordinator of the FWF-funded Special Research Program (SFB) "Functional Oxide Surfaces and Interfaces (FOXSI),[10]" involving 150 researchers in 10 research groups. He also directed the TU Wien funded Doctorate school "Catalysis Materials and Technology" with 11 research groups from 2011 to 2014.

Since Oct. 1st, 2023, Prof. Rupprechter holds the position of "Director of Research" of the FWF-funded Cluster of Excellence "Materials for Energy Conversion and Storage (MECS)."[3][2] This project spans from 2023 to 2028, with an option of extension to 2033.

Prof. Rupprechter has/had several leadership roles in professional societies such as the Austrian Chemical Society (GÖCH) and the Chemical Physical Society.[11] He is Vicechair of the Austrian Catalysis Society, thus Austrian Representative in the European Federation of Catalysis Societies (EFCATS)[12] and the International Association of Catalysis Societies (IACS).[13] He has been Austrian Representative in various European COST Actions:[14] CA22123 - European Materials Acceleration Center for Energy (EU-MACE; Management Committee);[15] MP0903 - Nanoalloys as advanced materials: from structure to properties and applications (NANOALLOY; Management Committee);[16] CM0904 - Network for intermetallic compounds as catalysts for steam reforming of methanol (IMC-SRM; Vice Chair, Management Committee; STSM Coordinator);[17] 540 - Photocatalytic technologies and novel nanosurfaces materials - critical issues (PHONASUM; Management Committee).[18]

In the Austrian Academy of Sciences (ÖAW), he is Member of the ESRF (European Synchrotron Radiation Facility) Board of ÖAW (2014-2023) and serves in various award panels of ÖAW (2017–2023).

Rupprechter has been and is (co-)organizer of various academic conferences and summer schools, e.g. lately the annual “International Workshop on Chemistry and Physics of Novel Materials”[19] (with P. Blaha), the EFCATS Summer School “Engineering Materials for Catalysis 2020” (with Albin Pintar and Nataša Novak Tušar: Portorož-Portorose, Slovenia), the Faraday Discussion on “Photoelectron Spectroscopy: New Horizons in Surface Analysis”, London, UK (2022), the “GÖCh-Symposium - Physikalische Chemie und Elektrochemie in Österreich 2023”[20] and the upcoming 16th Pannonian International Symposium on Catalysis (Seggau/Styria, Austria; September 1–5, 2024; with C. Rameshan).[21]

Awards and Honors

Rupprechter has received several awards and honors throughout his career, including:

Editorial Activities

Academic Supervision

Rupprechter has been involved in academic supervision, having supervised 22 Post-docs and 27 Ph.D. students. Several of his former students now hold academic positions at various ranks.

Key Scientific Contributions

Examining functioning catalysts at near atmospheric pressure (NAP) and realistic temperature is crucial to obtain a fundamental understanding, Rupprechter has developed dedicated UHV-compatible high-pressure cells for model catalysts (single crystals, thin films, nanoparticles), enabling sum frequency generation (SFG) laser spectroscopy, polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS), and X-ray photoelectron spectroscopy (NAP-XPS) under reaction conditions. For industrial-grade nanomaterials, corresponding in situ (operando) spectroscopy is carried out by Fourier transform infrared spectroscopy (FTIR and DRIFTS), X-ray absorption spectroscopy (XAS), NAP-XPS, and X-ray diffraction (XRD). Significant advances were made in directly imaging the local kinetics of surface reactions by in situ surface (correlative) microscopy, with photoemission electron microscopy (PEEM), scanning photoelectron microscopy (SPEM) and field emission/ion microscopy (FEM/FIM) applied to metals and metal/oxide interfaces. Most studies were carried out at synchrotron sources and in lock-step with theory collaborations (DFT and micro-kinetics).

Model Catalysis

  • Rupprechter is among the early researchers in ambient pressure surface science, developing and applying UHV-compatible high-pressure (HP) cells for combined in situ surface spectroscopy and kinetics:[9][8] sum frequency generation (SFG) with Gábor A. Somorjai, SFG/PM-IRAS with Hans-Joachim Freund,[31][6] near atmospheric pressure- X-ray photoelectron spectroscopy (NAP-XPS) with V.I. Bukhtiyarov (J. Phys. Chem. C 2003/2004).[32][33] This enabled atmospheric pressure studies of UHV-grown model systems, creating the vital link to technological catalysis. Among several constructed HP cells, one specific design[34] is used by several groups worldwide.
  • First demonstration of SFG spectroscopy on oxide supported Pd nanoparticles, revealing size and pressure (ultra high vacuum-UHV to mbar) effects in CO adsorption.[35] This triggered many follow-up studies, also combined with NAP-XPS. His SFG activities continue till today, including single crystals, thin films, and nanoparticles.[36][37]
  • Combining atmospheric pressure reaction kinetics of the complex 1-butene hydrogenation and isomerization on Pd single crystals and Pd/Al2O3 model catalysts with density functional theory (DFT) calculations and microkinetic modeling (with A. Genest and N. Rösch), the particle size-dependent selectivity could be rationalized based on the abundance and specific properties of the contributing nanoparticle facets.[38][39]

Model and Applied Catalysis

  • Molecular-level operando insights into selective methanol steam reforming on PdZn and PdGa intermetallics (NAP-XPS, PM-IRAS, concentration modulation IR, EXAFS, DFT; with B. Klötzer, D. Ferri, K.M. Neyman). He was able to link reaction selectivity to the catalyst's atomic and electronic (VB) structure, backed by DFT (JPC C 2015). Model and applied studies blended well together.
  • Studies of ZrO2-based reforming catalysts by in situ (synchrotron) NAP-XPS and XAS spectroscopy, employing ultrathin (trilayer) ZrO2 films (Surf. Sci. 2019, JPC C 2015) and nano powders of ZrO2 and ZrO2/CeO2 (Catal. Tod. 2016/2017). Further studies of methane dry reforming demonstrated SMSI effects (J. Phys. Cond. Matt. 2018), Ni surface segregation in bimetallic CuNi/ZrO2, and coke suppression for Ni/ZrO2/CeO2.[8]

Applied Catalysis

  • Operando surface spectroscopy (XAS, NAP-XPS, FTIR, XRD) of CO oxidation and PROX on Co3O4 catalysts, exploiting both static and dynamic conditions, revealed a complex reaction network.[8][40] The presumably active (oxygen vacancy) sites were a minority species. Further studies contrasted Co3O4 to Co3O4/CeO2 and CoO (J. Phys.: Cond. Matt. 2022, Chem. Europ. J. 2021, Catal. Tod. 2019).
  • Surface chemistry of Au clusters on ceria-praseodymium mixed oxide supports: Au/Ce4Pr1Ox exhibited the highest activity in water gas shift, with combined experimental and theoretical studies showing that asymmetric O vacancies facilitate H2O dissociation.[41] Using thiolate-protected atomically precise Au clusters on various supports as truly monodisperse catalysts.[42]

In Situ/Operando Surface Microscopy

Locally resolved imaging of ongoing surface reactions by photoemission electron microscopy (PEEM), directly revealing phenomena such as facet-resolved catalytic ignition, multi-frequential oscillations, anisotropic surface oxidation, coexisting multi-states, and long-ranging metal/oxide interface effects (with Y. Suchorski).[8][43][44] This opened a new pathway to investigate catalyst heterogeneity and structure sensitivity,[45] based on a 10-year research effort in developing the concepts of kinetics by imaging and surface structure and particle size libraries. Combining PEEM and DFT/microkinetics (with K.M. Neyman and H. Grönbeck) yielded fundamental insights on interface activity.[43][46] PEEM was combined with SPEM (Scanning Photoelectron Microscopy)[44] and recently extended to XPEEM and LEEM (low energy electron microscopy) in a true in situ correlative microscopy approach.[47][48]

Single Particle Catalysis

Field electron microscopy (FEM) is applied to image an ongoing catalytic reaction on the facets of an individual metal nanocrystal in real time, enabling, e.g., to resolve interfacet coupling and its collapse due to surface restructuring.[49][50][51] When the produced water was used as imaging species, the active sites were directly identified by in situ field ion microscopy (FIM). First observation of nano-chaos in a catalytic reaction[52] and direct imaging of rare-earth promotor effects.[53]

References

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  3. ^ a b "MECS – Cluster of Excellence – MATERIALS FOR ENERGY CONVERSION AND STORAGE". Retrieved 2023-10-26.
  4. ^ Rupprechter, G.; Seeber, G.; Hayek, K.; Hofmeister, H. (1994-11-16). "Epitaxial noble metal particles upon oxidation and reduction. A model system for supported metal catalysts". Physica Status Solidi (A) (in German). 146 (1): 449–459. Bibcode:1994PSSAR.146..449R. doi:10.1002/pssa.2211460137.
  5. ^ Rupprechter, G.; Hayek, K.; Hofmeister, H. (1998-01-25). "Electron Microscopy of Thin-Film Model Catalysts: Activation of Alumina-Supported Rhodium Nanoparticles". Journal of Catalysis. 173 (2): 409–422. doi:10.1006/jcat.1997.1917. ISSN 0021-9517.
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  33. ^ Morkel, M.; Kaichev, V. V.; Rupprechter, G.; Freund, H.-J.; Prosvirin, I. P.; Bukhtiyarov, V. I. (2004-08-01). "Methanol Dehydrogenation and Formation of Carbonaceous Overlayers on Pd(111) Studied by High-Pressure SFG and XPS Spectroscopy". The Journal of Physical Chemistry B. 108 (34): 12955–12961. doi:10.1021/jp048149a. ISSN 1520-6106.
  34. ^ Rupprechter, G.; Dellwig, T.; Unterhalt, H.; Freund, H.-J. (2001-01-01). "CO adsorption on Ni(100) and Pt(111) studied by infrared–visible sum frequency generation spectroscopy: design and application of an SFG-compatible UHV–high-pressure reaction cell". Topics in Catalysis. 15 (1): 19–26. doi:10.1023/A:1009063611629. ISSN 1572-9028. S2CID 56468057.
  35. ^ Dellwig, T.; Rupprechter, G.; Unterhalt, H.; Freund, H.-J. (2000-07-24). "Bridging the Pressure and Materials Gaps: High Pressure Sum Frequency Generation Study on Supported Pd Nanoparticles". Physical Review Letters. 85 (4): 776–779. Bibcode:2000PhRvL..85..776D. doi:10.1103/PhysRevLett.85.776. PMID 10991396.
  36. ^ Pramhaas, Verena; Roiaz, Matteo; Bosio, Noemi; Corva, Manuel; Rameshan, Christoph; Vesselli, Erik; Grönbeck, Henrik; Rupprechter, Günther (2021-01-01). "Interplay between CO Disproportionation and Oxidation: On the Origin of the CO Reaction Onset on Atomic Layer Deposition-Grown Pt/ZrO 2 Model Catalysts". ACS Catalysis. 11 (1): 208–214. doi:10.1021/acscatal.0c03974. ISSN 2155-5435. PMC 7783867. PMID 33425478.
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  38. ^ Markova, Velina K.; Philbin, John P.; Zhao, Weina; Genest, Alexander; Silvestre-Albero, Joaquín; Rupprechter, Günther; Rösch, Notker (2018-07-06). "Catalytic Transformations of 1-Butene over Palladium. A Combined Experimental and Theoretical Study". ACS Catalysis. 8 (7): 5675–5685. doi:10.1021/acscatal.8b01013. ISSN 2155-5435.
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  42. ^ Pollitt, Stephan; Truttmann, Vera; Haunold, Thomas; Garcia, Clara; Olszewski, Wojciech; Llorca, Jordi; Barrabés, Noelia; Rupprechter, Günther (2020-06-05). "The Dynamic Structure of Au 38 (SR) 24 Nanoclusters Supported on CeO 2 upon Pretreatment and CO Oxidation". ACS Catalysis. 10 (11): 6144–6148. doi:10.1021/acscatal.0c01621. ISSN 2155-5435. PMC 7295362. PMID 32551181.
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