Zeolite-encaged Ultrasmall Pt-Zn Species with Trace Amount of Pt for Efficient Propane Dehydrogenation

Abstract

Propane dehydrogenation(PDH) has become a globe-welcoming technology to meet the massive demand for propylene, but the most commonly used Pt-based catalysts suffer from quick sintering, poor selectivity for propylene, and unsatisfied Pt utilization. Herein, a series of Silicalite-1(S-1) zeolite-encaged ultrasmall Pt-Zn clusters with a trace amount of Pt[40–180 ppm(parts per million)] were developed by using a one-pot ligand-protected direct H₂ reduction method. Interestingly, the extremely low amount of Pt can significantly promote the activity of zeolite-encaged Zn catalysts in PDH reactions. Thanks to the high Pt dispersion, the synergy between Pt and Zn species, and the confinement effect of zeolites, the optimized PtZn@S-1 catalyst with 180 ppm Pt and 1.88%(mass fraction) Zn, exhibited an extraordinarily high propane conversion(33.9%) and propylene selectivity(99.5%) at 550 °C with a weight hourly space velocity (WHSV) of 8 h⁻¹, affording an extremely high propylene formation rate of $340.7\,{\rm{mo}}{{\rm{l}}_{{{\rm{C}}_3}{{\rm{H}}_6}}} \cdot {g_{{\rm{Pt}}}}^{ - 1} \cdot {{\rm{h}}^{ - 1}}$. This work provides a reference for the preparation of zeolite-encaged metal catalysts with high activity and noble metal utilization in PDH reactions.

Keywords

Propane dehydrogenation / Zeolite / Confinement effect / Bimetallic catalyst / Pt-Zn

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