LAUSR

We demonstrated the single site catalyst Pt1/CeO2 greatly enhanced the selectivity of cyclization and aromatization in the n-hexane reforming reaction. Specifically, the selectivity of single site Pt1/CeO2 towards both cyclization and aromatization is above 86 % at 350 ˚C. The turnover frequency (TOF) of Pt1/CeO2 is 58.8 h-1 at 400 oC, which is close to Pt cluster/CeO2 (61.4 h-1), and much higher than Pt nanoparticle/CeO2 with Pt size of 2.5 nm and 7 nm. Combined with the catalytic results of cyclopentane (MCP) reforming, the dehydrocyclization and further aromatization of n-hexane was attributed to the prominent absorption of ring intermediate products on the single site Pt1/CeO2 catalysts. On the other side, with the multiple Pt adjacent active sites, the cluster and nanoparticle Pt/CeO2 samples favor the C-C bond cracking reaction. Ultimately, this in-depth study un-ravels the principles of hydrocarbons activation with differ-ent Pt size and represents a key step towards the rational design of new heterogeneous catalysts.