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Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation
- Source :
- Angewandte Chemie. 132:19618-19627
- Publication Year :
- 2020
- Publisher :
- Wiley, 2020.
-
Abstract
- 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. Herein, we develop 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 gave 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 C 3 H 6 gPt -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/Al2 O3 counterpart under the same conditions. We also show that 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.
Details
- ISSN :
- 15213757 and 00448249
- Volume :
- 132
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie
- Accession number :
- edsair.doi.dedup.....2ec07c385f5d2b8db8dd230e40fa3921
- Full Text :
- https://doi.org/10.1002/ange.202003349