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PtZn intermetallic nanoalloy encapsulated in silicalite‐1 for propane dehydrogenation
Author(s) -
Zhang Bofeng,
Li Guozhu,
Zhai Ziwei,
Chen Dali,
Tian Yajie,
Yang Ruoou,
Wang Li,
Zhang Xiangwen,
Liu Guozhu
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17295
Subject(s) - dehydrogenation , intermetallic , propane , catalysis , sintering , chemical engineering , chemistry , selectivity , materials science , inorganic chemistry , organic chemistry , alloy , engineering
Propane dehydrogenation (PDH) is one of the most effective methods to produce propylene. But the industrial Pt‐based catalysts often suffer from short‐term stability under the high temperature reaction environment (500–700°C) via sintering and coke deposition. Herein, stable PDH reaction in high propylene yield has been achieved by the confinement of Pt–Zn intermetallic alloys (IMAs) in the channels of silicalite‐1. Single‐site Zn in the MFI framework was found to play a key role on assisting and stabilizing the PtZn IMAs for efficient PDH. By the cooperative action of the spatial confined PtZn IMAs and the lattice confined framework Zn, high propylene selectivity (>99%) without obvious deactivation was realized on the as‐developed catalyst (PtZn@S‐1) under 600°C even after 90 h. The low deactivation constant (0.003 h −1 ) was 6 times lower than that of the industrial PtSn catalyst.