Localization of PdCl2 clusters supported on multi-wall carbon nanotubes (MWCNT) has been investigated using Xe-129 NMR of adsorbed xenon. As-made MWCNTs with channels initially inaccessible for adsorption and ball-milled MWCNTs with the totally accessible internal surface were used as supports. The observed Xe-129 NMR spectra were determined by the dynamics of xenon exchange between the aggregate pores and nanotube channels. No considerable changes of the (NMR)-N-129 spectrum with the concentration of supported PdCl2 were observed for the as-made MWCNT, while an additional resonance appeared for the ball-milled nanotubes. The Xe-129 NMR experiments evidenced the supported species to be localized on the internal surface of the ball-milled MWCNT.