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Related Experiment Videos

NO adsorption and dissociation on Rh(111): PM-IRAS study.

W T Wallace1, Y Cai, M S Chen

  • 1Department of Chemistry, P.O. Box 30012, Texas A&M University, College Station, Texas 77842-3012, USA.

The Journal of Physical Chemistry. B
|March 24, 2006
PubMed
Summary
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Nitric oxide (NO) dissociation on Rh(111) occurs at lower temperatures than previously thought. New adsorption pathways involving atomic oxygen on Rh(111) surfaces were identified.

Area of Science:

  • Surface Science
  • Heterogeneous Catalysis
  • Chemical Kinetics

Background:

  • Understanding nitric oxide (NO) adsorption and dissociation on metal surfaces is crucial for catalysis and environmental applications.
  • Previous studies on Rh(111) have provided insights but lacked conclusive details on surface structures and dissociation mechanisms.
  • The role of surface intermediates and reaction pathways at varying pressures and temperatures requires further investigation.

Purpose of the Study:

  • To investigate the adsorption and dissociation mechanisms of NO on Rh(111) using in situ spectroscopy.
  • To clarify the surface structures formed during NO adsorption under different pressure and temperature conditions.
  • To determine the onset temperature for NO dissociation on Rh(111) and identify influencing factors.

Main Methods:

Related Experiment Videos

  • In situ polarization-modulation infrared reflection absorption spectroscopy (PM-IRAS) was employed.
  • Experiments were conducted on a Rh(111) single crystal surface.
  • NO gas was exposed at moderate (< or =10(-6) Torr) and high (1 Torr) pressures, with temperatures ranging from <275 K to 300 K.

Main Results:

  • A transition from 3-fold hollow to atop bonding of NO was observed at moderate pressures (< or =10(-6) Torr) and temperatures (<275 K).
  • This transition is attributed to gas-phase NO adsorption directed to atop sites by existing chemisorbed atomic oxygen (O) species in hollow sites, not NO migration.
  • High pressure (1 Torr) NO exposure at 300 K exclusively resulted in atop NO, challenging previously proposed surface structures.

Conclusions:

  • NO dissociation on Rh(111) occurs at significantly lower temperatures than previously reported.
  • The presence of decomposition products, specifically atomic oxygen, influences NO adsorption pathways.
  • Existing models for NO surface structures on Rh(111) at high pressures need revision based on these findings.