| Sum frequency generation (SFQ) vibrational spectroscopy studies of combustion reactions on platinum single crystal surfaces (2004) | |||||||||||
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| Chapter Conclusions have studied the dissociation catalyzed platinum single crystals torr the crystal dissociates K Under the same conditions dissociates K and dissociates K Hence the dissociation reaction structure sensitive reaction SFG was used monitor the top site resonance the platinum crystals were heated the dissociation temperature when exposed torr all three systems the resonance shifts lower frequency the platinum crystal heated However the frequency the resonance the dissociation frequency lower the and crystal faces than the crystal believe that the and crystal faces must undergo roughening expose step kink sites order facilitate the dissociation reaction This supported UHV studies dissociation catalyzed platinum crystals These studies observe dissociation only when step kink sites are present Since the surface very stable needs heated produce the low coordination number sites needed for dissociation Since the surface easily reconstructs able form the active sites for dissociation relatively low temperatures The SFG spectra support our conclusion that the molecules are sitting low coordination number platinum atoms the dissociation temperature Since the surface already has step sites the dissociation reaction can take place without Conclusions further roughening the surface The resonance the crystal face the dissociation temperature very similar frequency molecules adsorbed only the step sites the crystal Further studies showed that the dissociation reaction takes | |||||||||||
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