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Subnanometer Bimetallic Platinum–Zinc Clusters in Zeolites for Propane Dehydrogenation
Author(s) -
Sun Qiming,
Wang Ning,
Fan Qiyuan,
Zeng Lei,
Mayoral Alvaro,
Miao Shu,
Yang Ruoou,
Jiang Zheng,
Zhou Wei,
Zhang Jichao,
Zhang Tianjun,
Xu Jun,
Zhang Peng,
Cheng Jun,
Yang DongChun,
Jia Ran,
Li Lin,
Zhang Qinghong,
Wang Ye,
Terasaki Osamu,
Yu Jihong
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202003349
Subject(s) - dehydrogenation , bimetallic strip , catalysis , propane , selectivity , chemistry , space velocity , zeolite , platinum , inorganic chemistry , ligand (biochemistry) , organic chemistry , biochemistry , receptor
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 molC3 H6 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. 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.