Presented are thermal desorption spectroscopy (TDS) data of methanol, n-pentane, and methanol/n-pentane co-adsorbed on carbon nanotubes (CNTs) supported on silica. Whereas alkane TDS indicates three different adsorption sites (external, groove, internal), in agreement with earlier studies, only two structures are present in methanol (MeOH) TDS consistent with the dominance of strong MeOH-MeOH hydrogen bonding. However, the co-adsorption data provide evidence for MeOH adsorption on interior sites. (c) 2007 Elsevier B.V. All rights reserved.