---
_id: '64018'
abstract:
- lang: eng
  text: CO oxidation is an extensively studied reaction in heterogeneous catalysis
    due to its seeming simplicity and its great importance for emission control. However,
    the role of particle size and more specifically structure sensitivity in this
    reaction is still controversial. In the present study, colloidal “surfactant-free”
    Pt nanoparticles (NPs) in a size regime of 1–4 nm with narrow size distribution
    and control over particle size were synthesized and subsequently supported on
    Al2O3 to prepare model catalysts. CO oxidation was performed using Pt NPs catalysts
    with particles sizes of 1, 2, 3, and 4 nm at different reaction temperatures.
    It is shown that the reaction exhibits a particle size effect that depends strongly
    on the reaction conditions. At 170 °C, the reaction seems to proceed within the
    same kinetic regime for all particle sizes, but the surface normalized activity
    depends strongly on the particle size, with maximum activity for nanoparticles
    2 nm in diameter. A temperature increase to 200 °C leads to a change of the kinetic
    regime that depends on the particle size. For Pt NPs 1 nm in diameter a reaction
    order of 1 for O2 was observed, indicating that O2 adsorbs molecularly and dissociates
    in a following step, which represents the generally accepted mechanism on Pt surfaces.
    The reaction order of −1 for CO demonstrates that the surface is saturated with
    CO under reaction conditions. With increasing particle size, the reaction orders
    of O2 and CO change. For particles 2 nm in size, an increase in temperature also
    results in reaction orders of 1 for O2 and −1 for CO; NPs of 3 and 4 nm, even
    at higher temperatures, show no clear kinetic behavior that can be explained by
    a single reaction mechanism. Instead, the Boudouard reaction between two adjacent
    adsorbed CO molecules was identified as an important additional reaction pathway
    that occurs preferentially on large particles and causes more complex kinetics.
author:
- first_name: Sarah
  full_name: Neumann, Sarah
  last_name: Neumann
- first_name: Torsten
  full_name: Gutmann, Torsten
  id: '118165'
  last_name: Gutmann
- first_name: Gerd
  full_name: Buntkowsky, Gerd
  last_name: Buntkowsky
- first_name: Stephen
  full_name: Paul, Stephen
  last_name: Paul
- first_name: Greg
  full_name: Thiele, Greg
  last_name: Thiele
- first_name: Heiko
  full_name: Sievers, Heiko
  last_name: Sievers
- first_name: Marcus
  full_name: Bäumer, Marcus
  last_name: Bäumer
- first_name: Sebastian
  full_name: Kunz, Sebastian
  last_name: Kunz
citation:
  ama: Neumann S, Gutmann T, Buntkowsky G, et al. Insights into the reaction mechanism
    and particle size effects of CO oxidation over supported Pt nanoparticle catalysts.
    <i>Journal of Catalysis</i>. 2019;377:662–672. doi:<a href="https://doi.org/10.1016/j.jcat.2019.07.049">10.1016/j.jcat.2019.07.049</a>
  apa: Neumann, S., Gutmann, T., Buntkowsky, G., Paul, S., Thiele, G., Sievers, H.,
    Bäumer, M., &#38; Kunz, S. (2019). Insights into the reaction mechanism and particle
    size effects of CO oxidation over supported Pt nanoparticle catalysts. <i>Journal
    of Catalysis</i>, <i>377</i>, 662–672. <a href="https://doi.org/10.1016/j.jcat.2019.07.049">https://doi.org/10.1016/j.jcat.2019.07.049</a>
  bibtex: '@article{Neumann_Gutmann_Buntkowsky_Paul_Thiele_Sievers_Bäumer_Kunz_2019,
    title={Insights into the reaction mechanism and particle size effects of CO oxidation
    over supported Pt nanoparticle catalysts}, volume={377}, DOI={<a href="https://doi.org/10.1016/j.jcat.2019.07.049">10.1016/j.jcat.2019.07.049</a>},
    journal={Journal of Catalysis}, author={Neumann, Sarah and Gutmann, Torsten and
    Buntkowsky, Gerd and Paul, Stephen and Thiele, Greg and Sievers, Heiko and Bäumer,
    Marcus and Kunz, Sebastian}, year={2019}, pages={662–672} }'
  chicago: 'Neumann, Sarah, Torsten Gutmann, Gerd Buntkowsky, Stephen Paul, Greg Thiele,
    Heiko Sievers, Marcus Bäumer, and Sebastian Kunz. “Insights into the Reaction
    Mechanism and Particle Size Effects of CO Oxidation over Supported Pt Nanoparticle
    Catalysts.” <i>Journal of Catalysis</i> 377 (2019): 662–672. <a href="https://doi.org/10.1016/j.jcat.2019.07.049">https://doi.org/10.1016/j.jcat.2019.07.049</a>.'
  ieee: 'S. Neumann <i>et al.</i>, “Insights into the reaction mechanism and particle
    size effects of CO oxidation over supported Pt nanoparticle catalysts,” <i>Journal
    of Catalysis</i>, vol. 377, pp. 662–672, 2019, doi: <a href="https://doi.org/10.1016/j.jcat.2019.07.049">10.1016/j.jcat.2019.07.049</a>.'
  mla: Neumann, Sarah, et al. “Insights into the Reaction Mechanism and Particle Size
    Effects of CO Oxidation over Supported Pt Nanoparticle Catalysts.” <i>Journal
    of Catalysis</i>, vol. 377, 2019, pp. 662–672, doi:<a href="https://doi.org/10.1016/j.jcat.2019.07.049">10.1016/j.jcat.2019.07.049</a>.
  short: S. Neumann, T. Gutmann, G. Buntkowsky, S. Paul, G. Thiele, H. Sievers, M.
    Bäumer, S. Kunz, Journal of Catalysis 377 (2019) 662–672.
date_created: 2026-02-07T16:02:06Z
date_updated: 2026-02-17T16:14:45Z
doi: 10.1016/j.jcat.2019.07.049
extern: '1'
intvolume: '       377'
keyword:
- Solid state NMR
- “Surfactant-free” platinum nanoparticles
- CO oxidation
- Particle size effect
- Structure sensitivity
language:
- iso: eng
page: 662–672
publication: Journal of Catalysis
status: public
title: Insights into the reaction mechanism and particle size effects of CO oxidation
  over supported Pt nanoparticle catalysts
type: journal_article
user_id: '100715'
volume: 377
year: '2019'
...