D2 desorption was observed between ~270 K and ~750 K for all Ptn, with intensity that decreased rapidly over the series of TPD runs, and generally shifted toward higher temperatures. D2 desorption was clearly bimodal for Pt11, with an initial feature that peaked near 360 K, followed by a stronger feature starting near 400 K and peaking at ~520 K. For Pt4 and Pt7, the bimodal structure was less obvious, possibly because the higher temperature feature shifted ~50 K to lower temperature, overlapping to varying degrees with the low temperature feature. The bimodal structure generally became less pronounced in subsequent TPD runs.