Catalysis by ultrathin
LaBO3 (B=Co, Fe) perovskite films

Subproject P08

Perovskites are important catalysts, but detailed knowledge of their surface structure and chemistry is often lacking. The long-term objective of P08 is to elucidate structure-function correlations and visualize molecule-perovskite interaction in reactions involving O2, H2, CO, CO2, or H2O.

In the first project period, we will develop surface science-based model systems of LaCoO3 and LaFeO3 perovskites. Both epitaxial and polycrystalline thin films will be grown in UHV, guided by characterization via LEED, SXRD, SEM/EBSD, XPS/UPS/LEIS, IRAS, and TPD. Isotopically (18O or 13C) labeled adsorbates or films will reveal how oxygen and oxygen-containing molecules are activated. We will analyze the data in close collaboration with theoretical groups who simulate structure, stability, and infrared spectra (P03 Kresse).

We will employ a unique combination of in situ surface spectroscopy (PM-IRAS, NAP-XPS, SXRD) and in situ surface microscopy (PEEM, SPEM), combined with MS gas phase analysis, to monitor ongoing reactions from HV to atmospheric pressure. This procedure should enable us to gain fundamental insights into the interplay of ternary oxide atomic and electronic structure, defects, composition, adsorption, as well as initiation and spatial progression of surface reactions on the mesoscale via reaction fronts (local kinetics by imaging). Project P08 will create the required bridge between single crystals (P02 Diebold, P04 Parkinson) and more application-relevant nanomaterials (P10 Föttinger).

Günther Rupprechter
PI

Expertise

Our expertise is experimental surface science and its application to studies in heterogeneous catalysis. We operate a total of seven ultrahigh-vacuum (UHV) chambers, three of which are coupled to high-pressure cells. In situ and operando studies of surface reactions are carried out by area-averaging surface spectroscopy and real-time surface microscopy on the nano- and mesoscale. All chambers are equipped with facilities for sample preparation (sputtering, annealing, gas dosing), as well as various growth techniques (e-beam evaporators, Knudsen cells, sputter deposition). Analysis techniques used in our research include:

  • Auger Electron Spectroscopy (AES)
  • Field Emission Microscopy (FEM)
  • Field Ion Microscopy (FIM)
  • Gas Chromatography (GC)
  • Low-Energy Electron Diffraction (LEED)
  • Low-Energy Ion Scattering (LEIS)
  • Mass Spectroscopy (MS)
  • PhotoEmission Electron Microscopy (PEEM)
  • Polarization Modulation Infrared Reflection-Absorption Spectroscopy (PM-IRAS)
  • Sum Frequency Generation (SFG)
  • Scanning PhotoElectron Microscopy (SPEM)
  • Scanning Tunneling Microscopy (STM)
  • Temperature-Programmed Desorption (TPD)
  • Ultraviolet Photoelectron Spectroscopy (UPS)
  • X-ray Absorption Spectroscopy (XAS)
  • Surface X-Ray Diffraction (SXRD)
  • X-ray Photoelectron Spectroscopy (XPS)

Collaboration Partners:

  • Prof. Andreas Stierle, DESY Hamburg, Germany: SXRD
  • Dr. Luca Gregoratti, ELETTRA Sincrotrone Trieste, Italy: SPEM
Our main equipment
Schematic overview on the left (a); photograph on the right (b)

The combined application of photoemission electron microscopy (PEEM) and scanning photoelectron microscopy (SPEM) is particularly beneficial for TACO because these techniques allow visualizing ongoing reactions and local surface analysis on a µm-scale.

Team

Günther Rupprechter
PI

Thomas Wicht
PhD Student

Parinya Tangpakonsab PhD Student

Associates

Yuri Suchorski
Associated Professor

Yvan J. O. Asencios
Visiting Professor

Alexander Genest
PostDoc

Thomas Haunold
PostDoc

Xia Li
PostDoc

Nevzat Yigit
PostDoc

Philipp Winkler
PostDoc

Johannes Zeininger
PostDoc

Maximilian Raab
PhD Student

Publications

26 entries « 1 of 3 »

2022

Reaction Modes on a Single Catalytic Particle: Nanoscale Imaging and Micro-Kinetic Modeling

Zeininger, Johannes; Raab, Maximilian; Suchorski, Yuri; Buhr, Sebastian; Stöger-Pollach, Michael; Bernardi, Johannes; Rupprechter, Günther

Reaction Modes on a Single Catalytic Particle: Nanoscale Imaging and Micro-Kinetic Modeling

Journal ArticleOpen Access

In: ACS Catalysis, vol. 12, no. 20, pp. 12774–12785, 2022.

Abstract | Links | BibTeX | Tags: P08

Pattern Formation in Catalytic H2 Oxidation on Rh: Zooming in by Correlative Microscopy

Zeininger, Johannes; Winkler, Philipp; Raab, Maximilian; Suchorski, Yuri; Prieto, Mauricio J.; Tănase, Liviu C.; Caldas, Lucas Souza; Tiwari, Aarti; Schmidt, Thomas; Stöger-Pollach, Michael; Steiger-Thirsfeld, Andreas; Cuenya, Beatriz Roldan; Rupprechter, Günther

Pattern Formation in Catalytic H2 Oxidation on Rh: Zooming in by Correlative Microscopy

Journal ArticleOpen Access

In: ACS Catalysis, vol. 12, no. 19, pp. 11974–11983, 2022.

Abstract | Links | BibTeX | Tags: P08

Active sites and deactivation of room temperature CO oxidation on Co3O4 catalysts: combined experimental and computational investigations

Yigit, Nevzat; Genest, Alexander; Terloev, Schamil; Möller, Jury; Rupprechter, Günther

Active sites and deactivation of room temperature CO oxidation on Co3O4 catalysts: combined experimental and computational investigations

Journal ArticleOpen Access

In: Journal of Physics: Condensed Matter, vol. 34, no. 35, pp. 354001, 2022.

Abstract | Links | BibTeX | Tags: P08

Oxidative coupling of methane—comparisons of MnTiO3–Na2WO4 and MnOx–TiO2–Na2WO4 catalysts on different silica supports

Tiyatha, Worapinit; Chukeaw, Thanaphat; Sringam, Sarannuch; Witoon, Thongthai; Chareonpanich, Metta; Rupprechter, Günther; Seubsai, Anusorn

Oxidative coupling of methane—comparisons of MnTiO3–Na2WO4 and MnOx–TiO2–Na2WO4 catalysts on different silica supports

Journal ArticleOpen Access

In: Scientific Reports, vol. 12, pp. 2595, 2022.

Abstract | Links | BibTeX | Tags: P08, TACO-associated

High-performance water gas shift induced by asymmetric oxygen vacancies: Gold clusters supported by ceria-praseodymia mixed oxides

Shi, Junjie; Li, Hailian; Genest, Alexander; Zhao, Weixuan; Qi, Pengfei; Wang, Tao; Rupprechter, Günther

High-performance water gas shift induced by asymmetric oxygen vacancies: Gold clusters supported by ceria-praseodymia mixed oxides

Journal ArticleOpen Access

In: Applied Catalysis B: Environmental, vol. 301, pp. 120789, 2022.

Abstract | Links | BibTeX | Tags: P08

Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La2O3 Catalysts for the Oxidative Coupling of Methane

Kiatsaengthong, Danusorn; Jaroenpanon, Kanticha; Somchuea, Pooripong; Chukeaw, Thanaphat; Chareonpanich, Metta; Faungnawakij, Kajornsak; Sohn, Hiesang; Rupprechter, Günther; Seubsai, Anusorn

Effects of Mg, Ca, Sr, and Ba Dopants on the Performance of La2O3 Catalysts for the Oxidative Coupling of Methane

Journal ArticleOpen Access

In: ACS Omega, vol. 7, no. 2, pp. 1785–1793, 2022.

Abstract | Links | BibTeX | Tags: P08

2021

Sum Frequency Generation in Ambient Environments: Vibrational Spectroscopy at Solid/Gas and Solid/Liquid Interfaces

Pramhaas, Verena; Rupprechter, Günther

Sum Frequency Generation in Ambient Environments: Vibrational Spectroscopy at Solid/Gas and Solid/Liquid Interfaces

Book Chapter

In: Ambient Pressure Spectroscopy in Complex Chemical Environments, vol. 1396, Chapter 6, pp. 119–145, American Chemical Society, 2021, ISBN: 9780841298125.

Abstract | Links | BibTeX | Tags: P08

LiOx-modification of Ni and Co3O4 surfaces: An XPS, LEIS and LEED study

Haunold, Thomas; Rupprechter, Günther

LiOx-modification of Ni and Co3O4 surfaces: An XPS, LEIS and LEED study

Journal ArticleOpen Access

In: Surface Science, vol. 713, pp. 121915, 2021.

Abstract | Links | BibTeX | Tags: P08

Single-Particle Catalysis: Revealing Intraparticle Pacemakers in Catalytic H2 Oxidation on Rh

Zeininger, Johannes; Suchorski, Yuri; Raab, Maximilian; Buhr, Sebastian; Grönbeck, Henrik; Rupprechter, Günther

Single-Particle Catalysis: Revealing Intraparticle Pacemakers in Catalytic H2 Oxidation on Rh

Journal ArticleOpen Access

In: ACS Catalysis, vol. 11, no. 15, pp. 10020–10027, 2021.

Abstract | Links | BibTeX | Tags: P08, TACO-associated

Emerging applications of MXene materials in CO2 photocatalysis

Shen, Jiahui; Wu, Zhiyi; Li, Chaoran; Zhang, Chengcheng; Genest, Alexander; Rupprechter, Günther; He, Le

Emerging applications of MXene materials in CO2 photocatalysis

Journal Article

In: FlatChem, vol. 28, pp. 100252, 2021.

Abstract | Links | BibTeX | Tags: P08, pre-TACO

26 entries « 1 of 3 »