title: Titanium(IV) in the organic-structure-directing-agent-free synthesis of hydrophobic and large-pore molecular sieves as redox catalysts.
abstract: 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.
authors.affiliation: Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 (Singapore) http://www.ntu.edu.sg/home/zhaoyanli/|Catalytic Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 (Japan).
authors.forename: Jingui
authors.initials: J
authors.lastname: Wang
authors.affiliation: Catalytic Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 (Japan).
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Yokoi
authors.affiliation: Catalytic Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 (Japan).
authors.forename: Junko N
authors.initials: JN
authors.lastname: Kondo
authors.affiliation: Catalytic Chemistry Division, Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8503 (Japan). ttatsumi@cat.res.titech.ac.jp.
authors.forename: Takashi
authors.initials: T
authors.lastname: Tatsumi
authors.affiliation: Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 (Singapore) http://www.ntu.edu.sg/home/zhaoyanli/. zhaoyanli@ntu.edu.sg.|School of Materials Science and Engineering, Nanyang Technological University, 639798 (Singapore). zhaoyanli@ntu.edu.sg.
authors.forename: Yanli
authors.initials: Y
authors.lastname: Zhao
mesh_terms: D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008855:Microscopy, Electron, Scanning; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D017640:Silicates / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D016877:Oxidants; D017640:Silicates; D006861:Hydrogen Peroxide; D014025:Titanium
keywords: heterogeneous catalysis; molecular sieves; synthetic methods; titanium; zeolites