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Preparation and Reactivity of Gasless Nanostructured Energetic Materials
Published on: April 2, 2015
Reactions of CO2 on solid and liquid Al100+
Katheryne L Leslie1, Deven Shinholt, Martin F Jarrold
1Chemistry Department, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405, USA.
The Journal of Physical Chemistry. A
|June 12, 2012
Summary
Reactions of carbon dioxide (CO2) on aluminum clusters show temperature-dependent product formation and dissociation. Above aluminum
Area of Science:
- Surface Science
- Chemical Physics
- Materials Science
Background:
- Investigating the interaction of small molecules with metal clusters is crucial for understanding catalytic processes and material properties.
- Aluminum clusters are model systems for studying fundamental surface chemistry due to their unique electronic and structural characteristics.
Purpose of the Study:
- To explore the reaction pathways of carbon dioxide (CO2) on aluminum cluster cations (Al(100)+).
- To determine the influence of cluster temperature and kinetic energy on reaction products and dissociation dynamics.
Main Methods:
- Experimental investigation of CO2 reactions with Al(100)+ clusters.
- Varying cluster temperatures from 300 K to 1100 K.
- Modulating the relative kinetic energy of CO2 from 0.2 eV to 10 eV.
Main Results:
- At low temperatures, CO2 forms Al(100)O+ (stripping) and Al(100)CO2+ (complex).
- At higher temperatures (above melting point), both products dissociate via loss of Al2O.
- Dissociation yields Al(98)+ from Al(100)O+ and Al(98)CO+ and Al(96)C+ from Al(100)CO2+.
Conclusions:
- The dissociation of CO2 reaction products on Al(100)+ is strongly temperature-dependent, occurring above the melting point.
- The enhanced dissociation above the melting temperature is attributed to a less endothermic reaction pathway in the liquid phase compared to the solid phase.
- This study highlights the significant role of cluster phase (solid vs. liquid) in determining reaction outcomes.
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