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Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation

Authors :
Zheng Jiang
Li Lin
Peng Zhang
Jichao Zhang
Jun Xu
Ruoou Yang
Alvaro Mayoral
Ran Jia
Qinghong Zhang
Wei Zhou
Lei Zeng
Osamu Terasaki
Qiyuan Fan
Jihong Yu
Qiming Sun
Dong-Chun Yang
Ye Wang
Ning Wang
Jun Cheng
Tianjun Zhang
Shu Miao
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