Kim et al. investigated the anion exchange between Sc(OTf)3 and imidazolium-based ILs immobilized on polystyrene resin containing weakly coordinating anions such as [SbF6]─. The formation of the new catalytic species of Sc3+ was evidenced by 19F NMR. In our work, we prepared ILs phases covalently immobilized on polystyrene (Merrifield resin) with subsequent adsorption of Sc(OTf)3. XPS was then used to evaluate the ion exchange between the IL and Sc(OTf)3, which ultimately could promote an increase in the Lewis acidity of Sc3+. Among the high-resolution spectra obtained for each element, the region of Sc 2p photoemission line stands out, since we are interested in verifying the presence of new Sc3+ species in the material. A -1.6 eV binding energy shift was observed for the Sc 2p3/2 and Sc 2p1/2 doublet of the commercial Sc(OTf)3, compared to values observed for PS-[C8Im][SbF6]/Sc(OTf)3 (Table 1). Thus, the Sc present in the new catalytic species, formed through ion exchange between Sc(OTf)3 and [SbF6]-IL, is more electropositive and, therefore, more Lewis acidic. The binding energies were also compared with literature data for Sc(OTf)3.