The adsorption and desorption of HCl on Pt(111) is investigated by temperature programmed desorption (TPD), infrared reflection absorption spectroscopy (IRAS), and low energy electron diffraction (LEED). Five peaks are identified in the TPD spectra prior to the onset of multilayer desorption. For (theta > 0.38 ML, theta = 1.5x1015 cm-2) HCl adsorbs molecularly at 20 K as an amorphous solid with two desorption peaks at 70 and 77 K. A third peak at 84 K is tentatively assigned to molecularly adsorbed HCl. Peaks at ~135 and 200 K are assigned to recombinative desorption of dissociated HCl, in agreement with earlier studies. Kinetic analysis is conducted and the results demonstrate a strong coverage dependent desorption energy for theta
Revised: April 7, 2011 |
Published: July 26, 2005
Citation
Daschbach J.L., J. Kim, P. Ayotte, R.S. Smith, and B.D. Kay. 2005.Adsorption and Desorption of HCI on Pt(111).Journal of Physical Chemistry B 109, no. 32:15506-15514.PNNL-SA-44943.