Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Low-temperature cluster catalysis.

Ken Judai1, Stéphane Abbet, Anke S Wörz

  • 1University of Ulm, Institute of Surface Chemistry and Catalysis, Albert-Einstein-Allee 47, D-89069 Ulm, Germany.

Journal of the American Chemical Society
|March 5, 2004
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Activation of methane by the tantalum trioxide anion, TaO<sub>3</sub><sup></sup>.

Physical chemistry chemical physics : PCCP·2026
Same author

Nanoplasmonic sensing to study CO and oxygen adsorption and CO oxidation on size-selected Pt<sub>10</sub> clusters.

Nanoscale·2024
Same author

Pt<sub>12</sub>H<sub>24</sub> <sup>-</sup>: A Cuboctahedral Platinum Hydride Cluster Cage.

Chemphyschem : a European journal of chemical physics and physical chemistry·2024
Same author

A molecular beam study of CO oxidation on Pd clusters supported on alumina: the effect of cluster size.

Physical chemistry chemical physics : PCCP·2024
Same author

Comparison of the Molecular Motility of Tubulin Dimeric Isoforms: Molecular Dynamics Simulations and Diffracted X-ray Tracking Study.

International journal of molecular sciences·2023
Same author

CO<sub>2</sub>-Activation by size-selected tantalum cluster cations (Ta<sub>1-16</sub><sup>+</sup>): thermalization governing reaction selectivity.

Physical chemistry chemical physics : PCCP·2022

This study demonstrates that palladium clusters (Pd(n)) exhibit size-dependent catalytic activity for NO reduction by CO. These small metal clusters maintain constant catalytic performance over time and operate at lower temperatures than larger palladium nanoparticles.

Area of Science:

  • Catalysis
  • Materials Science
  • Surface Chemistry

Background:

  • Metal clusters exhibit unique size-dependent properties due to electron confinement.
  • Controlling chemical reactions by tuning cluster size has been suggested but not experimentally confirmed for supported clusters over multiple cycles.

Purpose of the Study:

  • To investigate the catalytic activity and stability of size-selected palladium clusters (Pd(n), n=4, 8, 30) for NO reduction by CO.
  • To determine if supported clusters maintain catalytic properties over reaction cycles and at lower temperatures compared to bulk materials.

Main Methods:

  • Pulsed molecular beam experiments were used to prepare and study Pd(n) clusters.
  • Turn-over frequencies (TOF) were measured for the CO + NO reaction over Pd(n) clusters at varying temperatures.

Related Experiment Videos

Main Results:

  • Catalytic reactivity for NO reduction by CO is a function of palladium cluster size.
  • Measured TOF remained constant at a given temperature, indicating stable catalytic performance.
  • Maximal reactivity occurred at temperatures at least 100 K lower than for palladium nanoparticles or single crystals.

Conclusions:

  • Small supported palladium clusters are catalytically active and stable over multiple reaction cycles.
  • The low-temperature activity is attributed to specific binding sites that prevent catalyst poisoning by nitrogen adatoms.
  • Tuning cluster size offers a method to control catalytic processes and achieve low-temperature catalysis.