Direkt zum Inhalt
  • Paul Scherrer Institut PSI
  • PSI Research, Labs & User Services

Digital User Office

  • Digital User Office
  • DE
  • EN
  • FR
Paul Scherrer Institut (PSI)
Suche
Paul Scherrer Institut (PSI)

Hauptnavigation

  • Research at PSIÖffnen dieses Hauptmenu Punktes
    • Research Initiatives
    • Ethics and Research integrity
    • Scientific Highlights
    • Scientific Events
    • Scientific Career
    • PSI-FELLOW
    • PSI Data Policy
  • Research Divisions and LabsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Research with Neutrons and Muons
    • Photon Science
    • Energy and Environment
    • Nuclear Energy and Safety
    • Biology and Chemistry
    • Scientific Computing, Theory and Data
    • Large Research Facilities
  • Facilities and InstrumentsÖffnen dieses Hauptmenu Punktes
    • Overview
    • Large Research Facilities
    • Facilities
    • PSI Facility Newsletter
  • PSI User ServicesÖffnen dieses Hauptmenu Punktes
    • User Office
    • Methods at the PSI User Facilities
    • Proposals for beam time
    • Proposal Deadlines
    • Data Analysis Service (PSD)
    • EU support programmes
  • New ProjectsÖffnen dieses Hauptmenu Punktes
    • SLS 2.0
    • IMPACT
  • DE
  • EN
  • FR

Digital User Office (mobile)

  • Digital User Office

Sie befinden sich hier:

  1. PSI Home
  2. Labs & User Services
  3. PSD
  4. SLS
  5. Super_XAS
  6. The structure of active sites of CoMo/Al2O3 catalysts determined by RIXS spectro

Sekundäre Navigation

SuperXAS

  • People
  • User Information
    • Operation Schedule
    • Useful Phone numbers
  • Ex Situ Sample Measurements
  • Beamline Layout
    • Source
    • Optics
  • Sample environments
    • Pump-Probe XAS
    • Johann XES spectrometer
    • von Hamos XES spectrometer
    • Capillary reactor setup
  • Publications
  • Scientific Highlights

Info message

Dieser Inhalt ist nicht auf Deutsch verfügbar.
31. August 2020

The structure of active sites of CoMo/Al2O3 catalysts determined by RIXS spectroscopy.

A fundamental understanding of the number and structure of active sites in alumina supported CoMo catalysts is crucial to improve the production of clean transportation fuels by hydrodesulfurization (HDS). In situ 1s2p resonant inelastic X-ray scattering (RIXS) and X-ray absorption spectroscopy (XAS), collected at the SuperXAS beamline of the SLS, provided insight in the coordination state and number of active sites (“Co−Mo−S”) of the sulfided CoMo/ Al2O3catalysts prepared with and without chelating additives. Based on the evaluation of thiophene HDS activity as a function of the Co/Mo ratio, it was determined that only for Co/ Mo < 0.1, cobalt is exclusively in interaction with the MoS2phase, making this the ideal catalyst for identifying the nature of the active cobalt sites for hydrogenolysis. These cobalt promoter atoms were identified to be in centrosymmetric coordination with the MoS2phase, with six sulfur ligands coordinated to each cobalt center. The octahedral coordination of cobalt in Co−Mo−S in alumina-supported HDS catalysts contrasts the tetrahedral cobalt coordination found in co-promoted MoS2model systems supported on gold or carbon. We attribute the difference to the more disordered MoS2structures in technical alumina-supported HDS catalysts. The number of Co−Mo−S sites depended strongly on the catalyst preparation method. Chelating additives, such as citric acid and nitrilotriacetic acid, increased the number of Co−Mo−S sites without significantly altering their intrinsic activity. These results demonstrate that state-of-the-art structural characterization tools, such as RIXS, identify the structure of active sites in actual technical catalysts and that these structures may be different from model systems. Combining such characterization tools with guided catalyst design can provide an insight into the structure of amorphous, nanostructured materials, which aid in the development of improved heterogeneous catalysts for widely used catalytic processes.

Additional information

Dr. Grigory Smolentsev

SuperXAS beamline
Operando spectroscopy group & Laboratory for Synchrotron Radiation and Femtochemistry (LSF)
Swiss Light Source, Paul Scherrer Intitute
5232 Villigen-PSI, Switzerland
Telephone: +41 56 310 58 05
E-mail: grigory.smolentsev@psi.ch

Original Publication

Evidence of Octahedral Co–Mo–S Sites in Hydrodesulfurization Catalysts as Determined by Resonant Inelastic X-ray Scattering and X-ray Absorption Spectroscopy

Lennart van Haandel, Grigory Smolentsev, Jeroen A. van Bokhoven, Emiel J.M. Hensen, Thomas Weber

ACS Catalysis , 31 August 2020
DOI: 10.1021/acscatal.0c03062

Mit Sidebar

top

Fussbereich

Paul Scherrer Institut

Forschungsstrasse 111
5232 Villigen PSI
Schweiz

Telefon: +41 56 310 21 11
Telefax: +41 56 310 21 99

Der Weg zu uns
Kontakt

Besucherzentrum psi forum
Schülerlabor iLab
Zentrum für Protonentherapie
PSI Bildungszentrum
PSI Guest House (in english)
PSI Gastronomie
psi forum-Shop

 

Service & Support

  • Telefonbuch
  • User Office
  • Accelerator Status
  • Publikationen des PSI
  • Lieferanten
  • E-Rechnung
  • Computing
  • Sicherheit

Karriere

  • Arbeiten am PSI
  • Stellenangebote
  • Aus- und Weiterbildung
  • Career Center
  • Berufsbildung
  • PSI Bildungszentrum

Für die Medien

  • Das PSI in Kürze
  • Zahlen und Fakten
  • Mediacorner
  • Medienmitteilungen
  • Social Media

Folgen Sie uns: Twitter (deutsch) LinkedIn Youtube Facebook Instagram Issuu RSS

Footer legal

  • Impressum
  • Nutzungsbedingungen
  • Editoren-Login