Hydrogen thermal desorption, platinum

Thermal desorption of hydrogen from platinum and Pt-Au films (146) results in a similar conclusion for these alloys. On average, hydrogen is more loosely bound to the alloys than to pure platinum. About 50% of the adsorbate is desorbed by pumping at 78 K from the alloys, while only a very small percentage is desorbed from platinum at this temperature. 

The region of the cyclic voltammogram, corresponding to anodic removal of Hathermal desorption spectra of platinum catalysts. However, unlikely the thermal desorption spectra, the cyclic-voltammetric profiles for H chemisorbed on Pt are usually free of kinetic effects. In addition, the electrochemical techniques offer the possibility of cleaning eventual impurities from the platinum surface through a combined anodic oxidation-cathodic reduction pretreatment. Comparative gas-phase and electrochemical measurements, performed for dispersed platinum catalysts, have previously demonstrated similar hydrogen and carbon monoxide chemisorption stoichiometries at both the liquid and gas-phase interfaces (14). 

Figure 3. Thermal desorption spectra for small alkenes adsorbed on the platinum (111) surface showing sequential hydrogen evolution and decomposition. (Reproduced from ref. 3. Copyright 1982 American Chemical Society.)...

Figure 7. Thermal desorption of hydrogen from the flat stepped and kinked platinum single crystal surfaces. (Reproduced with permission from ref. 5. Copyright 1980 Elsevier Science Publishers.)...

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