Subnanometer Bimetallic Pt-Zn Clusters in Zeolites for Propane Dehydrogenation.

Propane dehydrogenation (PDH) has great potential to meet the increasing global demand for propylene, but the widely-used Pt-based catalysts usually suffer from short-term stability and unsatisfactory propylene selectivity. Here, we developed a ligand-protected direct hydrogen reduction method for encapsulating subnanometer bimetallic Pt-Zn clusters inside silicalite-1 (S-1) zeolite. The introduction of Zn species significantly improved the stability of the Pt clusters and exhibited a superhigh propylene selectivity of 99.3% with a weight hourly space velocity (WHSV) of 3.6~54 h -1 and specific activity of propylene formation of 65.5 mol C3H6 g Pt -1 h -1 (WHSV=108 h -1 ) at 550 °C. Moreover, no obvious deactivation was observed over PtZn4@S-1-H catalyst even after 13000 min on stream (WHSV=3.6 h -1 ), affording an extremely low deactivation constant of 0.001 h -1 , which is 200 times lower than that of the PtZn4/Al 2 O 3 counterpart under the same conditions. Significantly, the introduction of Cs + ions into the zeolite can improve the regeneration stability of catalysts, and the catalytic activity kept unchanged after four continuous cycles. These zeolite-encaged Pt-Zn catalysts represent the best performance s to date for PDH conversions, promising their practical industrial applications.

• Publication year

  2020

• Venue

  Angewandte Chemie

• Publication date

  2020-04-07

• Fields of study

  Medicine, Materials Science, Chemistry

• Identifiers
  DOI 10.1002/anie.202003349PMID 32259339
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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