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Unraveling the H

Caomhán Stewart1, Emma K Gibson2,3, Kevin Morgan1

  • 1School of Chemistry and Chemical Engineering, Queen's University Belfast, Stranmillis Road, Belfast BT9 5AG, U.K.

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Hydrogen (H2) enhances carbon monoxide (CO) oxidation through nonthermal effects, not just heat. This study reveals H2 increases oxygen interaction with palladium surfaces, promoting the Langmuir-Hinshelwood mechanism.

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Area of Science:

  • Heterogeneous catalysis
  • Surface chemistry
  • Reaction kinetics

Background:

  • The promotional effect of hydrogen (H2) on carbon monoxide (CO) oxidation is debated, with uncertainty regarding thermal versus chemical contributions.
  • Existing literature lacks a definitive consensus on the mechanism behind H2 promotion in CO oxidation.

Purpose of the Study:

  • To elucidate the mechanistic role of H2 in the oxidation of CO.
  • To differentiate between thermal and nonthermal effects contributing to H2 promotion.
  • To provide a deeper understanding of the active catalytic site during CO oxidation.

Main Methods:

  • Spatially resolved mass spectrometry (MS) and X-ray absorption spectroscopy (XAS) were employed to characterize the catalyst's active environment.
  • Temporal Analysis of Products (TAP) studies were conducted under isothermal conditions to investigate reaction pathways.
  • Combined spectroscopic and kinetic techniques provided insights into the H2 promotional effect.

Main Results:

  • The local coordination of palladium (Pd) remained consistent in the presence and absence of H2, indicating a stable active site.
  • Evidence for nonthermal effects in H2-promoted CO oxidation was observed.
  • H2 was found to promote the Langmuir-Hinshelwood mechanism, suggesting enhanced oxygen-palladium surface interaction.

Conclusions:

  • Nonthermal effects play a significant role in hydrogen-promoted CO oxidation.
  • The interaction between oxygen and the palladium surface is enhanced by the presence of H2.
  • This research offers novel insights into the mechanism of H2 promotion in CO oxidation using a combination of advanced techniques.