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Uncalcined TS‐2 immobilized Au nanoparticles as a bifunctional catalyst to boost direct propylene epoxidation with H 2 and O 2
Author(s) -
Zhang Zhihua,
Zhao Xuan,
Wang Gang,
Xu Jialun,
Lu Mengke,
Tang Yanqiang,
Fu Wenzhao,
Duan Xuezhi,
Qian Gang,
Chen De,
Zhou Xinggui
Publication year - 2020
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.16815
Subject(s) - bifunctional , catalysis , thermogravimetric analysis , propylene oxide , bifunctional catalyst , materials science , chemical engineering , nanoparticle , selectivity , chemistry , nanotechnology , polymer , organic chemistry , composite material , ethylene oxide , engineering , copolymer
Developing stable yet efficient Au–Ti bifunctional catalysts is important but challenging for direct propylene epoxidation with H 2 and O 2 . This work describes a novel strategy of employing uncalcined titanium silicalite‐2 (TS‐2‐B) to immobilize Au nanoparticles as a bifunctional catalyst for the reaction. Under no promoter effects, the Au/TS‐2‐B catalyst compared to the referenced Au/TS‐1‐B catalyst delivers outstanding catalytic performance, that is, exceptionally high stability over 100 hr, propylene oxide (PO) formation rate of 118 g PO ·hr −1 ·kg cat −1 , PO selectivity of 90% and hydrogen efficiency of 35%. The plausible relationship of catalyst structure and performance is established by using multiple techniques, such as UV–vis, high‐angle annular dark‐field scanning transmission electron microscopy, thermogravimetric analysis, and X‐ray photoelectron spectroscopy. A unique synergy of Au–Ti 4+ –Ti 3+ triple sites is proposed for our developed Au/TS‐2‐B catalyst with the higher stable PO formation rate and hydrogen efficiency. The insights reported here could shed new light on the rational design of highly stable and efficient Au–Ti bifunctional catalysts for the reaction.