Tailoring the Proximity of Metal‐Acid in Metal/zeolite Bifunctional Catalysts for Enhanced n ‐Hexane Hydroisomerization

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Abstract
The spatial arrangement between metal and acid sites critically influences the hydroisomerization efficiency of metal/zeolite catalysts in n ‐alkane conversion. Nevertheless, achieving precise control on metal‐acid intimacy remains a significant challenge at the nanoscale. Herein, Pt nanoparticles are strategically tailored on TiO 2 ‐modified ZSM‐5 carriers via atomic layer deposition, leveraging the TiO 2 spacer thickness as a tunable parameter to modulate interfacial distances. In the hydroisomerization of n ‐hexane, the catalytic performance of the Pt‐Ti/ZSM‐5 with different TiO 2 thickness displayed a volcano‐shaped trend with respect to the metal‐acid distances, peaking at 67.5% iso ‐C6 yield under optimized proximity. This enhanced performance arose from the metal‐acid distance‐mediated diffusion confinement, resulting in the kinetically favorable reaction pathways. The established structure‐property relationship provides a blueprint for rationally designing spatially optimized metal/zeolite catalysts, while advancing the fundamental understanding of bifunctional catalysis.
Funding Information
  • National Natural Science Foundation of China (22302234)
  • China Petrochemical Corporation

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