The size of Pt clusters is intimately related to the catalytic activity and product distribution, yet its effect on the n-alkane reforming remains unclear. Herein, the highly dispersed Pt in single-atoms and subnano-clusters (pseudo-single-atom Pt), Pt subnano-clusters and Pt nano-clusters were respectively deposited on the Sn-modified KY zeolite by proper preparation methods (atomic layer deposition or impregnation in the solution of Pt nano-clusters), to systematically investigate the size effect of Pt clusters on the catalytic conversion of n-alkane. Among these, the Pt subnano-clusters demonstrated optimal catalytic performance in the reforming of n-alkane, exhibiting the selectivity towards cyclization products (95.1%) with the n-octane conversion of 99.1%. This study revealed the dehydrocyclization ability of Pt species with different size, providing insights for maximizing the atomic utilization and enhancing catalytic reforming performance.

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