The effect of the alkali metal cation modification on the aromatization of n-C6 over Pt/ML zeolite catalysts (M=Li. Na. K. Rb) was studied. The results showed that the selectivity for aromati/ation of n-C6 over Pt/MI, increased as the basicity of the alkali cation increased. According to PASCA experiments, dispersed Pt particles were located on the “electron-donation” site of L zeolite XPS measurements further evidenced that a stronger hasicitv of the mouifving canon contributed more electron donation to Pt particles on the surface of 1, zeolite, and shifted the electron binding energy of Pt 4f to lower energies On the other hand, the electron binding energy of Pt 4f in Pt/ML zeolite after reduction was lower than that of Pt0 It is proposed that Pt particles in reduced samples may exist as a Ptδ- state. Moreover, the selectivity for aromatization of aikane was improved since the Ptδ- state was less active to extensive dehvdrogenation of aikane. Ptδ- stale may be presented in the reduced phase of the The effect of the alkali metal cation modification on the aromatization of n-C6 over Pt / ML zeolite catalysts (M = Li. Na.K.Rb) was studied. The results showed that the selectivity for aromati / ation of n-C6 over Pt / MI, increased as the basicity of the alkali increased increased. According to PASCA experiments, dispersed Pt particles were located on the “electron-donation ” site of L zeolite XPS measurements further evidenced that a stronger hasicitv of the mouifving canon contributed more electron donation to Pt particles on the surface of 1, zeolite, and shifted the electron binding energy of Pt 4f to lower energies On the other hand, the electron binding energy of Pt 4f in Pt / ML zeolite after reduction was lower than that of Pt0 It is proposed that Pt particles in reduced samples may exist as a Pt δ-state. Furthermore, the selectivity for aromatization of aikane was improved since the Pt δ-state was less active to extensive dehvdrogenation of aikane. Ptδ-stale may be presented in the r educed phase of the