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Titanium(IV) in the Organic‐Structure‐Directing‐Agent‐Free Synthesis of Hydrophobic and Large‐Pore Molecular Sieves as Redox Catalysts
Author(s) -
Wang Jingui,
Yokoi Toshiyuki,
Kondo Junko N.,
Tatsumi Takashi,
Zhao Yanli
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500443
Subject(s) - molecular sieve , titanium , catalysis , materials science , chemical engineering , redox , molecule , chemistry , nanotechnology , organic chemistry , engineering
Titanium(IV) incorporated into the framework of molecular sieves can be used as a highly active and sustainable catalyst for the oxidation of industrially important organic molecules. Unfortunately, the current process for the incorporation of titanium(IV) requires a large amount of expensive organic molecules used as organic‐structure‐directing agents (OSDAs), and this significantly increases the production costs and causes environmental problems owing to the removal of OSDAs by pyrolysis. Herein, an OSDA‐free process was developed to incorporate titanium(IV) into BEA‐type molecular sieves for the first time. More importantly, the hydrophobic environment and the robust, 3 D, and large pore structure of the titanium(IV)‐incorporated molecular sieves fabricated from the OSDA‐free process created a catalyst that was extremely active and selective for the epoxidation of bulky cyclooctene in comparison to Ti‐incorporated BEA‐type molecular sieves synthesized with OSDAs and commercial titanosilicate TS‐1.